X28HC64PM-12 [RENESAS]

8KX8 EEPROM 5V, 120ns, PDIP28, PLASTIC, DIP-28;
X28HC64PM-12
型号: X28HC64PM-12
厂家: RENESAS TECHNOLOGY CORP    RENESAS TECHNOLOGY CORP
描述:

8KX8 EEPROM 5V, 120ns, PDIP28, PLASTIC, DIP-28

可编程只读存储器 电动程控只读存储器 电可擦编程只读存储器 光电二极管 内存集成电路
文件: 总16页 (文件大小:301K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
X28HC64  
®
64K, 8K x 8 Bit  
Data Sheet  
June 1, 2005  
FN8109.0  
• High reliability  
—Endurance: 1 million cycles  
—Data retention: 100 years  
5 Volt, Byte Alterable EEPROM  
FEATURES  
• JEDEC approved byte-wide pin out  
• 70ns access time  
• Simple byte and page write  
—Single 5V supply  
No external high voltages or V control circuits  
—Self-timed  
—No erase before write  
—No complex programming algorithms  
—No overerase problem  
• Low power CMOS  
DESCRIPTION  
The X28HC64 is an 8K x 8 EEPROM, fabricated with  
Intersil’s proprietary, high performance, floating gate  
CMOS technology. Like all Intersil programmable non-  
volatile memories, the X28HC64 is a 5V only device. It  
features the JEDEC approved pinto for byte-wide mem-  
ories, compatible with industry standard RAMs.  
PP  
—40mA active current max.  
—200µA standby current max.  
• Fast write cycle times  
—64-byte page write operation  
—Byte or page write cycle: 2ms typical  
—Complete memory rewrite: 0.25 sec. typical  
—Effective byte write cycle time: 32µs typical  
• Software data protection  
• End of write detection  
The X28HC64 supports a 64-byte page write operation,  
effectively providing a 32µs/byte write cycle, and  
enabling the entire memory to be typically written in 0.25  
seconds. The X28HC64 also features DATA Polling and  
Toggle Bit Polling, two methods providing early end of  
write detection. In addition, the X28HC64 includes a  
user-optional software data protection mode that further  
enhances Intersil’s hardware write protect capability.  
—DATA polling  
—Toggle bit  
Intersil EEPROMs are designed and tested for appli-  
cations requiring extended endurance. Inherent data  
retention is greater than 100 years.  
PIN CONFIGURATIONS  
TSOP  
LCC  
PLCC  
Plastic DIP  
A
A
A
I/O  
I/O  
I/O  
NC  
SS  
NC  
I/O  
I/O  
I/O  
A
A
A
A
A
A
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
Flat Pack  
CERDIP  
SOIC  
3
4
5
6
7
2
1
0
0
1
2
1
28  
27  
26  
25  
24  
23  
VCC  
NC  
A12  
A7  
4
3
2
1
32 31 30  
12  
2
NC  
NC  
V
WE  
NC  
A8  
V
A6  
A5  
A4  
A3  
A2  
A1  
A0  
5
29  
A8  
A9  
X28HC64  
3
CC  
6
7
28  
27  
NC  
WE  
NC  
4
A6  
3
4
5
6
7
A11  
NC  
OE  
A10  
22  
21  
5
A9  
A5  
8
9
26  
25  
A
A
9
A
I/O  
I/O  
20  
19  
18  
17  
8
6
A11  
A4  
X28HC64  
(Top View)  
7
X28HC64 22  
A3  
OE  
A10  
CE  
11  
10  
11  
24  
23  
A
OE  
10  
8
21  
20  
19  
18  
17  
16  
15  
A2  
CE  
9
A1  
CE  
I/O7  
I/O6  
12  
13  
22  
21  
NC  
10  
11  
12  
13  
14  
I/O7  
I/O6  
I/O5  
I/O4  
I/O3  
A0  
I/O0  
PGA  
14 15 16 17 18 19 20  
I/O0  
I/O1  
I/O1  
12  
I/O2  
13  
I/O3  
15  
I/O5  
I/O4  
I/O6  
18  
17  
I/O2  
VSS  
I/O0  
11  
A0  
10  
VSS  
14  
I/O7  
19  
16  
A1  
A3  
A2  
8
CE  
20  
A10  
21  
9
7
5
X28HC64  
A4  
6
OE  
22  
A11  
23  
(BOTTOM  
VIEW)  
A5  
A6  
A12  
2
VCC  
28  
A9  
24  
A8  
25  
A7  
3
WE  
27  
NC  
26  
NC  
1
4
Bottom View  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.  
Copyright Intersil Americas Inc. 2005. All Rights Reserved  
All other trademarks mentioned are the property of their respective owners.  
X28HC64  
PIN DESCRIPTIONS  
Addresses (A -A )  
PIN NAMES  
Symbol  
Description  
Address Inputs  
Data Input/Output  
Write Enable  
Chip Enable  
Output Enable  
+5V  
0
12  
A0-A12  
I/O0-I/O7  
WE  
The Address inputs select an 8-bit memory location  
during a read or write operation.  
Chip Enable (CE)  
CE  
The Chip Enable input must be LOW to enable all  
read/write operations. When CE is HIGH, power con-  
sumption is reduced.  
OE  
VCC  
VSS  
Ground  
Output Enable (OE)  
NC  
No Connect  
The Output Enable input controls the data output buff-  
ers and is used to initiate read operations.  
Data In/Data Out (I/O -I/O )  
0
7
Data is written to or read from the X28HC64 through  
the I/O pins.  
Write Enable (WE)  
The Write Enable input controls the writing of data to  
the X28HC64.  
BLOCK DIAGRAM  
65,536-Bit  
X Buffers  
Latches and  
Decoder  
EEPROM  
Array  
A0–A12  
Address  
Inputs  
Y Buffers  
Latches  
and  
I/O Buffers  
and Latches  
Decoder  
CE  
Control  
Logic and  
Timing  
I/O0–I/O7  
Data Inputs/Outputs  
OE  
WE  
VCC  
VSS  
FN8109.0  
June 1, 2005  
2
X28HC64  
DEVICE OPERATION  
Read  
Write Operation Status Bits  
The X28HC64 provides the user two write operation  
status bits. These can be used to optimize a system  
write cycle time. The status bits are mapped onto the  
I/O bus as shown in Figure 1.  
Read operations are initiated by both OE and CE  
LOW. The read operation is terminated by either CE or  
OE returning HIGH. This two line control architecture  
eliminates bus contention in a system environment.  
The data bus will be in a high impedance state when  
either OE or CE is HIGH.  
Figure 1. Status Bit Assignment  
I/O DP TB  
5
4
3
2
1
0
Write  
Write operations are initiated when both CE and WE  
are LOW and OE is HIGH. The X28HC64 supports  
both a CE and WE controlled write cycle. That is, the  
address is latched by the falling edge of either CE or  
WE, whichever occurs last. Similarly, the data is  
latched internally by the rising edge of either CE or  
WE, whichever occurs first. A byte write operation,  
once initiated, will automatically continue to comple-  
tion, typically within 2ms.  
Reserved  
Toggle Bit  
DATA Polling  
DATA Polling (I/O )  
7
The X28HC64 features DATA Polling as a method to  
indicate to the host system that the byte write or page  
write cycle has completed. DATA Polling allows a sim-  
ple bit test operation to determine the status of the  
X28HC64, eliminating additional interrupt inputs or  
external hardware. During the internal programming  
cycle, any attempt to read the last byte written will pro-  
Page Write Operation  
The page write feature of the X28HC64 allows the  
entire memory to be written in 0.25 seconds. Page write  
allows two to sixty-four bytes of data to be consecu-  
tively written to the X28HC64 prior to the commence-  
ment of the internal programming cycle. The host can  
fetch data from another device within the system during  
a page write operation (change the source address),  
duce the complement of that data on I/O (i.e. write  
data = 0xxx xxxx, read data = 1xxx xxxx). Once the  
7
programming cycle is complete, I/O will reflect true data.  
7
but the page address (A through A ) for each subse-  
quent valid write cycle to the part during this operation  
must be the same as the initial page address.  
6
12  
Toggle Bit (I/O )  
6
The X28HC64 also provides another method for deter-  
mining when the internal write cycle is complete. Dur-  
The page write mode can be initiated during any write  
operation. Following the initial byte write cycle, the  
host can write an additional one to sixty-three bytes in  
the same manner. Each successive byte load cycle,  
started by the WE HIGH to LOW transition, must begin  
within 100µs of the falling edge of the preceding WE. If  
a subsequent WE HIGH to LOW transition is not  
detected within 100µs, the internal automatic program-  
ming cycle will commence. There is no page write win-  
dow limitation. Effectively the page write window is  
infinitely wide, so long as the host continues to access  
the device within the byte load cycle time of 100µs.  
ing the internal programming cycle I/O will toggle  
6
from HIGH to LOW and LOW to HIGH on subsequent  
attempts to read the device. When the internal cycle is  
complete the toggling will cease and the device will be  
accessible for additional read or write operations.  
FN8109.0  
3
June 1, 2005  
X28HC64  
DATA POLLING I/O  
7
Figure 2. DATA Polling Bus Sequence  
Last  
Write  
WE  
CE  
OE  
VIH  
VOH  
HIGH Z  
I/O7  
VOL  
X28HC64  
Ready  
A0–A12  
An  
An  
An  
An  
An  
An  
An  
Figure 3. DATA Polling Software Flow  
DATA Polling can effectively reduce the time for writ-  
ing to the X28HC64. The timing diagram in Figure 2  
illustrates the sequence of events on the bus. The  
software flow diagram in Figure 3 illustrates one  
method of implementing the routine.  
Write Data  
No  
Writes  
Complete?  
Yes  
Save Last Data  
and Address  
Read Last  
Address  
IO7  
No  
Compare?  
Yes  
Ready  
FN8109.0  
4
June 1, 2005  
X28HC64  
THE TOGGLE BIT I/O  
6
Figure 4. Toggle Bit Bus Sequence  
Last  
Write  
WE  
CE  
OE  
VOH  
HIGH Z  
I/O6  
*
*
VOL  
X28HC64  
Ready  
* Beginning and ending state of I/O6 will vary.  
Figure 5. Toggle Bit Software Flow  
The Toggle Bit can eliminate the chore of saving and  
fetching the last address and data in order to implement  
DATA Polling. This can be especially helpful in an array  
comprised of multiple X28HC64 memories that is fre-  
quently updated. Toggle Bit Polling can also provide a  
method for status checking in multiprocessor applica-  
tions. The timing diagram in Figure 4 illustrates the  
sequence of events on the bus. The software flow dia-  
gram in Figure 5 illustrates a method for polling the  
Toggle Bit.  
Last Write  
Yes  
Load Accum  
From Addr N  
Compare  
Accum with  
Addr N  
No  
Compare  
Ok?  
Yes  
Ready  
FN8109.0  
5
June 1, 2005  
X28HC64  
HARDWARE DATA PROTECTION  
The X28HC64 can be automatically protected during  
power-up and power-down without the need for exter-  
nal circuits by employing the software data protection  
feature. The internal software data protection circuit is  
enabled after the first write operation utilizing the soft-  
ware algorithm. This circuit is nonvolatile and will  
remain set for the life of the device, unless the reset  
command is issued.  
The X28HC64 provides two hardware features that  
protect nonvolatile data from inadvertent writes.  
– Default V Sense—All write functions are inhibited  
CC  
when V is 3V typically.  
CC  
– Write Inhibit—Holding either OE LOW, WE HIGH, or  
CE HIGH will prevent an inadvertent write cycle dur-  
ing power-up and power-down, maintaining data  
integrity.  
Once the software protection is enabled, the X28HC64  
is also protected from inadvertent and accidental  
writes in the powered-up state. That is, the software  
algorithm must be issued prior to writing additional  
data to the device.  
SOFTWARE DATA PROTECTION  
The X28HC64 offers a software controlled data pro-  
tection feature. The X28HC64 is shipped from Intersil  
with the software data protection NOT ENABLED; that  
is, the device will be in the standard operating mode.  
In this mode data should be protected during power-  
up/-down operations through the use of external cir-  
cuits. The host would then have open read and write  
SOFTWARE ALGORITHM  
Selecting the software data protection mode requires  
the host system to precede data write operations by a  
series of three write operations to three specific  
addresses. Refer to Figure 6 and 7 for the sequence.  
The three-byte sequence opens the page write window,  
enabling the host to write from one to sixty-four bytes  
of data. Once the page load cycle has been com-  
pleted, the device will automatically be returned to the  
data protected state.  
access of the device once V was stable.  
CC  
FN8109.0  
6
June 1, 2005  
X28HC64  
SOFTWARE DATA PROTECTION  
Figure 6. Timing Sequence—Byte or Page Write  
VCC  
0V  
(VCC  
)
Data  
ADDR  
AAA  
1555  
55  
0AAA  
A0  
1555  
Writes  
OK  
Write  
Protected  
tWC  
CE  
Byte  
or  
Page  
tBLC MAX  
WE  
Figure 7. Write Sequence for Software  
Data Protection  
Regardless of whether the device has previously been  
protected or not, once the software data protection  
algorithm is used, the X28HC64 will automatically dis-  
able further writes unless another command is issued  
to deactivate it. If no further commands are issued the  
X28HC64 will be write protected during power-down  
and after any subsequent power-up.  
Write Data AA  
to Address  
1555  
Write Data 55  
to Address  
0AAA  
Note: Once initiated, the sequence of write operations  
should not be interrupted.  
Write Data A0  
to Address  
1555  
Byte/Page  
Load Enabled  
Write Data XX  
to Any  
Address  
Optional  
Byte/Page  
Load Operation  
Write Last  
Byte to  
Last Address  
After tWC  
Re-Enters Data  
Protected State  
FN8109.0  
7
June 1, 2005  
X28HC64  
RESETTING SOFTWARE DATA PROTECTION  
Figure 8. Reset Software Data Protection Timing Sequence  
VCC  
AAA  
1555  
55  
0AAA  
80  
1555  
AA  
1555  
55  
0AAA  
20  
1555  
Standard  
Operating  
Mode  
Data  
ADDR  
tWC  
CE  
WE  
Figure 9. Software Sequence to Deactivate Software  
Data Protection  
In the event the user wants to deactivate the software  
data protection feature for testing or reprogramming in  
an EEPROM programmer, the following six step algo-  
Write Data AA  
to Address  
1555  
rithm will reset the internal protection circuit. After t  
the X28HC64 will be in standard operating mode.  
,
WC  
Note: Once initiated, the sequence of write operations  
should not be interrupted.  
Write Data 55  
to Address  
0AAA  
Write Data 80  
to Address  
1555  
Write Data AA  
Address  
1555  
Write Data 55  
to Address  
0AAA  
Write Data 20  
to Address  
1555  
FN8109.0  
8
June 1, 2005  
X28HC64  
SYSTEM CONSIDERATIONS  
Because the X28HC64 has two power modes,  
standby and active, proper decoupling of the memory  
array is of prime concern. Enabling CE will cause tran-  
sient current spikes. The magnitude of these spikes is  
dependent on the output capacitive loading of the  
I/Os. Therefore, the larger the array sharing a common  
bus, the larger the transient spikes. The voltage peaks  
associated with the current transients can be sup-  
pressed by the proper selection and placement of  
decoupling capacitors. As a minimum, it is recom-  
mended that a 0.1µF high frequency ceramic capacitor  
Because the X28HC64 is frequently used in large  
memory arrays, it is provided with a two-line control  
architecture for both read and write operations. Proper  
usage can provide the lowest possible power dissipa-  
tion, and eliminate the possibility of contention where  
multiple I/O pins share the same bus.  
To gain the most benefit, it is recommended that CE  
be decoded from the address bus, and be used as the  
primary device selection input. Both OE and WE would  
then be common among all devices in the array. For a  
read operation, this assures that all deselected  
devices are in their standby mode, and that only the  
selected device(s) is/are outputting data on the bus.  
be used between V  
and V  
at each device.  
CC  
SS  
Depending on the size of the array, the value of the  
capacitor may have to be larger.  
In addition, it is recommended that a 4.7µF electrolytic  
bulk capacitor be placed between V  
and V  
for  
CC  
SS  
each eight devices employed in the array. This bulk  
capacitor is employed to overcome the voltage droop  
caused by the inductive effects of the PC board traces.  
Normalized I (RD) by Temperature  
Normalized I (RD) @ 25% Over  
CC  
CC  
Over Frequency  
the V Range and Frequency  
CC  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
5.5 VCC  
- 55°C  
5.5 V  
5.0 V  
CC  
CC  
+ 25°C  
+ 125°C  
4.5 V  
CC  
0
10  
20  
0
10  
20  
Frequency (MHz)  
Frequency (MHz)  
FN8109.0  
June 1, 2005  
9
X28HC64  
ABSOLUTE MAXIMUM RATINGS  
COMMENT  
Temperature under bias  
Stresses above those listed under “Absolute Maximum  
Ratings” may cause permanent damage to the device.  
This is a stress rating only; functional operation of the  
device (at these or any other conditions above those indi-  
cated in the operational sections of this specification) is  
not implied. Exposure to absolute maximum rating condi-  
tions for extended periods may affect device reliability.  
X28HC64 ......................................... -10°C to +85°C  
X28HC64I, X28HC64M.................. -65°C to +135°C  
Storage temperature ......................... -65°C to +150°C  
Voltage on any pin with  
respect to V ......................................... -1V to +7V  
SS  
D.C. output current...............................................5mA  
Lead temperature  
(soldering, 10 seconds).................................. 300°C  
RECOMMENDED OPERATING CONDITIONS  
Temperature  
Commercial  
Industrial  
Min.  
0°C  
Max.  
+70°C  
+85°C  
+125°C  
Supply Voltage  
Limits  
X28HC64  
5V ±10%  
-40°C  
-55°C  
Military  
D.C. OPERATING CHARACTERISTICS (Over recommended operating conditions unless otherwise specified.)  
Limits  
(1)  
Symbol  
Parameter  
Min. Typ.  
Max.  
Unit  
Test Conditions  
ICC  
VCC current (active)  
(TTL inputs)  
15  
40  
mA CE = OE = VIL, WE = VIH, All I/O’s = open,  
address inputs = TTL levels @ f = 10 MHz  
ISB1  
ISB2  
VCC current (standby)  
(TTL inputs)  
1
2
mA CE = VIH, OE = VIL All I/O’s = open,  
other inputs = VIH  
VCC current (standby)  
(CMOS inputs)  
100  
200  
µA  
CE = VCC - 0.3V, OE = GND, All I/O’s = open,  
other inputs = VCC - 0.3V  
ILI  
Input leakage current  
Output leakage current  
Input LOW voltage  
±10  
±10  
µA  
µA  
V
VIN = VSS to VCC  
ILO  
VOUT = VSS to VCC, CE = VIH  
(2)  
VlL  
-1  
2
0.8  
(2)  
VIH  
Input HIGH voltage  
Output LOW voltage  
Output HIGH voltage  
VCC + 1  
0.4  
V
VOL  
VOH  
V
IOL = 5mA  
2.4  
V
IOH = -5mA  
Notes: (1) Typical values are for TA = 25°C and nominal supply voltage  
(2) VIL min. and VIH max. are for reference only and are not tested.  
FN8109.0  
June 1, 2005  
10  
X28HC64  
ENDURANCE AND DATA RETENTION  
Parameter  
Minimum endurance  
Data retention  
Min.  
100,000  
100  
Max.  
Unit  
Cycles  
Years  
POWER-UP TIMING  
(1)  
Symbol  
Parameter  
Typ.  
Unit  
(3)  
tPUR  
Power-up to read operation  
Power-up to write operation  
100  
5
µs  
(3)  
tPUW  
ms  
CAPACITANCE T = +25°C, f = 1MHz, V = 5V  
A
CC  
Symbol  
Parameter  
Max.  
10  
Unit  
Test Conditions  
VI/O = 0V  
(3)  
CI/O  
Input/output capacitance  
Input capacitance  
pF  
pF  
(3)  
CIN  
6
VIN = 0V  
A.C. CONDITIONS OF TEST  
MODE SELECTION  
CE OE WE  
Input pulse levels  
0V to 3V  
5ns  
Mode  
Read  
Write  
I/O  
DOUT  
DIN  
Power  
Input rise and fall times  
Input and output timing levels  
L
L
L
H
X
H
L
Active  
Active  
1.5V  
H
X
Standby and  
write inhibit  
High Z  
Standby  
X
X
L
X
H
Write inhibit  
Write inhibit  
X
Note: (3) This parameter is periodically sampled and not 100% tested.  
EQUIVALENT A.C. LOAD CIRCUITS  
SYMBOL TABLE  
5V  
WAVEFORM  
INPUTS  
OUTPUTS  
Must be  
steady  
Will be  
steady  
1.92kΩ  
Output  
May change  
from LOW  
to HIGH  
Will change  
from LOW  
to HIGH  
1.37kΩ  
30pF  
May change  
from HIGH  
to LOW  
Will change  
from HIGH  
to LOW  
Don’t Care:  
Changes  
Allowed  
Changing:  
State Not  
Known  
N/A  
Center Line  
is High  
Impedance  
FN8109.0  
11  
June 1, 2005  
X28HC64  
A.C. CHARACTERISTICS (Over the recommended operating conditions unless otherwise specified.)  
Read Cycle Limits  
X28HC64-70  
X28HC64-90  
X28HC64-12  
-55°C to +125°C -55°C to +125°C -55°C to +125°C  
Symbol  
tRC  
Parameter  
Read cycle time  
Min.  
Max.  
Min.  
Max.  
Min.  
Max.  
Unit  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
70  
90  
120  
tCE  
Chip enable access time  
Address access time  
70  
70  
35  
90  
90  
40  
120  
120  
50  
tAA  
tOE  
Output enable access time  
CE LOW to active output  
OE LOW to active output  
CE HIGH to high Z output  
OE HIGH to high Z output  
Output hold from address change  
(4)  
tLZ  
0
0
0
0
0
0
(4)  
tOLZ  
(4)  
tHZ  
30  
30  
30  
30  
30  
30  
(4)  
tOHZ  
tOH  
0
0
0
Read Cycle  
tRC  
Address  
CE  
tCE  
tOE  
OE  
VIH  
WE  
tOLZ  
tOHZ  
tLZ  
tOH  
tHZ  
HIGH Z  
Data I/O  
Data Valid  
Data Valid  
tAA  
Note: (4) tLZ min., tHZ, tOLZ min., and tOHZ are periodically sampled and not 100% tested. tHZ max. and tOHZ max. are measured from the point  
when CE or OE return HIGH (whichever occurs first) to the time when the outputs are no longer driven.  
FN8109.0  
12  
June 1, 2005  
X28HC64  
WRITE CYCLE LIMITS  
(1)  
Symbol  
Parameter  
Min.  
Typ.  
Max.  
Unit  
ms  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
µs  
ns  
ns  
µs  
µs  
(5)  
tWC  
Write cycle time  
Address setup time  
2
5
tAS  
tAH  
tCS  
0
50  
0
Address hold time  
Write setup time  
Write hold time  
CE pulse width  
OE High setup time  
OE High hold time  
WE pulse width  
WE HIGH recovery  
Data valid  
tCH  
0
tCW  
tOES  
tOEH  
tWP  
50  
0
0
50  
50  
(6)  
tWPH  
(6)  
tDV  
tDS  
tDH  
1
Data setup  
50  
0
Data hold  
(6)  
tDW  
tBLC  
Delay to next write  
Byte load cycle  
10  
0.15  
100  
WE Controlled Write Cycle  
tWC  
Address  
tAS  
tAH  
tCS  
tCH  
CE  
OE  
tOES  
tOEH  
tWP  
WE  
tDV  
Data In  
Data Out  
Data Valid  
tDS  
tDH  
HIGH Z  
Notes: (5) tWC is the minimum cycle time to be allowed from the system perspective unless polling techniques are used. It is the maximum time  
the device requires to automatically complete the internal write operation.  
(6) tWPH and tDW are periodically sampled and not 100% tested.  
FN8109.0  
13  
June 1, 2005  
X28HC64  
CE CONTROLLED WRITE CYCLE  
tWC  
Address  
tAS  
tAH  
tCW  
CE  
tOES  
OE  
tOEH  
tCS  
tCH  
WE  
tDV  
Data Valid  
Data In  
tDS  
HIGH Z  
tDH  
Data Out  
Page Write Cycle  
OE(7)  
CE  
tWP  
tBLC  
WE  
tWPH  
Address*(8)  
I/O  
Last Byte  
Byte n+2  
Byte 0  
Byte 1  
Byte 2  
Byte n  
Byte n+1  
tWC  
*For each successive write within the page write operation, A6–A12 should be the same or  
writes to an unknown address could occur.  
Notes: (7) Between successive byte writes within a page write operation, OE can be strobed LOW: e.g. this can be done with CE and WE HIGH  
to fetch data from another memory device within the system for the next write; or with WE HIGH and CE LOW effectively performing a  
polling operation.  
(8) The timings shown above are unique to page write operations. Individual byte load operations within the page write must conform to  
either the CE or WE controlled write cycle timing.  
FN8109.0  
14  
June 1, 2005  
X28HC64  
(9)  
DATA Polling Timing Diagram  
Address  
CE  
An  
An  
An  
WE  
tOEH  
tOES  
OE  
tDW  
DOUT = X  
DIN = X  
I/O7  
DOUT = X  
tWC  
(9)  
Toggle Bit Timing Diagram  
CE  
WE  
tOES  
tOEH  
OE  
tDW  
HIGH Z  
I/O*6  
*
*
tWC  
* I/O6 beginning and ending state will vary, depending upon actual tWC  
.
Note: (9) Polling operations are by definition read cycles and are therefore subject to read cycle timings.  
FN8109.0  
15  
June 1, 2005  
X28HC64  
Ordering Information  
Device  
X28HC64  
X
X
-X  
Access Time  
-70 = 70ns  
-90 = 90ns  
-12 = 120ns  
Temperature Range  
Blank = Commercial = 0°C to +70°C  
I = Industrial = -40°C to +85°C  
M = Military = -55°C to +125°C  
MB = MIL-STD-883  
Package  
P = 28-Lead Plastic DIP  
D = 28-Lead Cerdip  
J = 32-Lead PLCC  
S = 28-Lead Plastic SOIC  
E = 32-Pad LCC  
K = 28-Lead Pin Grid Array  
F = 28-Lead Flat Pack  
T = 32-Lead TSOP  
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.  
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality  
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without  
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and  
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result  
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.  
For information regarding Intersil Corporation and its products, see www.intersil.com  
FN8109.0  
16  
June 1, 2005  

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