DS1643+100 [MAXIM]

Real Time Clock, CMOS, ROHS COMPLIANT, EDIP MODULE-28;
DS1643+100
型号: DS1643+100
厂家: MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述:

Real Time Clock, CMOS, ROHS COMPLIANT, EDIP MODULE-28

时钟 双倍数据速率 外围集成电路
文件: 总18页 (文件大小:372K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
DS1643/DS1643P  
Nonvolatile Timekeeping RAMs  
www.maxim-ic.com  
FEATURES  
PIN CONFIGURATIONS  
CIntegrated NV SRAM, Real-Time Clock,  
Crystal, Power-Fail Control Circuit and  
Lithium Energy Source  
VCC  
WE  
CE2  
A8  
N.C.  
A12  
A7  
1
28  
TOP VIEW  
27  
2
3
4
5
6
7
8
DS1643  
26  
25  
24  
23  
22  
21  
CClock Registers are Accessed Identically to the  
Static RAM. These Registers Reside in the  
Eight Top RAM Locations.  
A6  
A5  
A4  
A9  
A11  
OE  
A10  
CE  
DQ7  
DQ6  
DQ5  
DQ4  
DQ3  
A3  
CTotally Nonvolatile with Over 10 Years of  
Operation in the Absence of Power  
CAccess Times of 70ns and 100ns  
CBCD-Coded Year, Month, Date, Day, Hours,  
Minutes, and Seconds with Leap Year  
Compensation Valid Up to 2100  
A2  
A1  
A0  
9
10  
20  
19  
DQ0  
11  
18  
17  
16  
15  
12  
DQ1  
DQ2  
GND  
13  
14  
CPower-Fail Write Protection Allows for ±10%  
Encapsulated DIP  
(700-mil Extended)  
VCC Power Supply Tolerance  
CLithium Energy Source is Electrically  
Disconnected to Retain Freshness Until Power  
is Applied for the First Time  
N.C.  
N.C.  
N.C.  
34  
33  
32  
31  
30  
29  
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
1
2
3
CDS1643 Only (DIP Module)  
Standard JEDEC Byte-Wide 8K x 8 RAM  
Pinout  
N.C.  
N.C.  
N.C.  
DS1643P  
N.C.  
A12  
A11  
A10  
A9  
4
5
6
7
8
9
PFO  
VCC  
WE  
OE  
UL Recognized  
CDS1643P Only (PowerCap Module Board)  
Surface Mountable Package for Direct  
Connection to PowerCap Containing  
Battery and Crystal  
CE  
A8  
DQ7  
A7  
A6  
A5  
A4  
A3  
A2  
A1  
A0  
10  
DQ6  
DQ5  
DQ4  
DQ3  
DQ2  
DQ1  
DQ0  
GND  
11  
12  
13  
14  
15  
16  
17  
Replaceable Battery (PowerCap)  
Power-Fail Output  
X1 GND VBAT  
X2  
Pin-for-Pin Compatible with Other Densities of  
DS164XP Timekeeping RAM  
PowerCap Module Board  
(Uses DS9034PCX PowerCap)  
ORDERING INFORMATION  
VOLTAGE  
PART  
TEMP RANGE PIN-PACKAGE TOP MARK  
RANGE (V)  
5.0  
5.0  
5.0  
5.0  
5.0  
5.0  
5.0  
5.0  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
0°C to +70°C  
DS1643-70+  
DS1643-70  
28 EDIP (0.740a) DS1643+70  
28 EDIP (0.740a) DS1643-70  
28 EDIP (0.740a) DS1643+100  
28 EDIP (0.740a) DS1643-100  
DS1643+100  
DS1643-100  
DS1643P-70+  
DS1643P-70  
DS1643P+100  
DS1643P-100  
34-PowerCap*  
34-PowerCap*  
34-PowerCap*  
34-PowerCap*  
DS1643P+70  
DS1643P-70  
DS1643P+100  
DS1643P-100  
*DS9034-PCX, DS9034I-PCX, DS9034-PCX+ required (must be ordered separately).  
A “+” indicates a lead-free product. The top mark will include a “+” symbol on lead-free devices.  
1 of 16  
REV: 042705  
DS1643/DS1643P  
PIN DESCRIPTION  
PIN  
NAME  
FUNCTION  
PDIP  
PowerCap  
1, 2, 3,  
31–34  
30  
25  
24  
23  
22  
21  
20  
19  
18  
28  
29  
27  
26  
16  
15  
14  
13  
12  
11  
10  
9
1
N.C.  
No Connection  
Address Inputs  
2
A12  
A7  
3
4
A6  
5
A5  
6
A4  
7
A3  
8
A2  
9
A1  
10  
21  
23  
24  
25  
11  
12  
13  
15  
16  
17  
18  
19  
20  
22  
26  
27  
28  
A0  
A10  
A11  
A9  
A8  
DQ0  
DQ1  
DQ2  
DQ3  
DQ4  
DQ5  
DQ6  
DQ7  
CE  
Data Input/Output  
8
Active-Low Chip-Enable Input  
Active-Low Output-Enable Input  
Chip-Enable 2 Input (Active High)  
Active-Low Write-Enable Input  
Power-Supply Input  
7
OE  
6
CE2  
WE  
VCC  
5
Active-Low Power-Fail Output. This open-drain  
4
PFO  
pin requires a pullup resistor for proper operation.  
14  
17  
GND  
X1, X2,  
VBAT  
Ground  
Crystal Connection, Battery Connection  
2 of 16  
DS1643/DS1643P  
DESCRIPTION  
The DS1643 is an 8K x 8 nonvolatile static RAM with a full function Real Time Clock (RTC) that are  
both accessible in a byte-wide format. The nonvolatile timekeeping RAM is functionally equivalent to  
any JEDEC standard 8K x 8 SRAM. The device can also be easily substituted in ROM, EPROM and  
EEPROM sockets providing read/write nonvolatility and the addition of the real time clock function. The  
real time clock information resides in the eight uppermost RAM locations. The RTC registers contain  
year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the day  
of the month and leap year are made automatically. The RTC clock registers are double-buffered to  
avoid access of incorrect data that can occur during clock update cycles. The double-buffered system also  
prevents time loss as the timekeeping countdown continues unabated by access to time register data. The  
DS1643 also contains its own power-fail circuitry, which deselects the device when the VCC supply is in  
an out of tolerance condition. This feature prevents loss of data from unpredictable system operation  
brought on by low VCC as errant access and update cycles are avoided.  
PACKAGES  
The DS1643 is available in two packages: 28-pin DIP module and 34-pin PowerCap® module. The 28-  
pin DIP style module integrates the crystal, lithium energy source, and silicon all in one package. The 34-  
pin PowerCap Module Board is designed with contacts for connection to a separate PowerCap  
(DS9034PCX) that contains the crystal and battery. This design allows the PowerCap to be mounted on  
top of the DS1643P after the completion of the surface mount process. Mounting the PowerCap after the  
surface mount process prevents damage to the crystal and battery due to high temperatures required for  
solder reflow. The PowerCap is keyed to prevent reverse insertion. The PowerCap Module Board and  
PowerCap are ordered separately and shipped in separate containers. The part number for the PowerCap  
is DS9034PCX.  
CLOCK OPERATIONS—READING THE CLOCK  
While the double-buffered register structure reduces the chance of reading incorrect data, internal updates  
to the DS1643 clock registers should be halted before clock data is read to prevent reading of data in  
transition. However, halting the internal clock register updating process does not affect clock accuracy.  
Updating is halted when a one is written into the read bit, the seventh most significant bit in the control  
register. As long as a 1 remains in that position, updating is halted. After a halt is issued, the registers  
reflect the count, that is day, date, and time that was current at the moment the halt command was issued.  
However, the internal clock registers of the double-buffered system continue to update so that the clock  
accuracy is not affected by the access of data. All of the DS1643 registers are updated simultaneously  
after the clock status is reset. Updating is within a second after the read bit is written to 0.  
PowerCap is a registered trademark of Dallas Semiconductor.  
3 of 16  
DS1643/DS1643P  
Figure 1. Block Diagram  
DS1643/  
DS1643P  
Table 1. Truth Table  
VCC  
CE2  
X
VIL  
VIH  
VIH  
VIH  
MODE  
Deselect  
Deselect  
Write  
DQ  
POWER  
Standby  
Standby  
Active  
CE  
VIH  
X
OE  
X
WE  
X
High Z  
High Z  
Data In  
Data Out  
High-Z  
X
X
VIL  
VIL  
VIL  
X
VIL  
VIH  
VIL  
VIH  
VIH  
5V M10%  
Read  
Active  
Read  
Active  
<4.5V >  
VBAT  
<VBAT  
X
X
X
X
X
X
X
X
Deselect  
Deselect  
High-Z  
High-Z  
CMOS Standby  
Data Retention Mode  
SETTING THE CLOCK  
The 8-bit of the control register is the write bit. Setting the write bit to a 1, like the read bit, halts updates  
to the DS1643 registers. The user can then load them with the correct day, date and time data in 24 hour  
BCD format. Resetting the write bit to a 0 then transfers those values to the actual clock counters and  
allows normal operation to resume.  
STOPPING AND STARTING THE CLOCK OSCILLATOR  
The clock oscillator may be stopped at any time. To increase the shelf life, the oscillator can be turned off  
to minimize current drain from the battery. The OSC bit is the MSB for the seconds registers. Setting it to  
a 1 stops the oscillator.  
FREQUENCY TEST BIT  
Bit 6 of the day byte is the frequency test bit. When the frequency test bit is set to logic 1 and the  
oscillator is running, the LSB of the seconds register will toggle at 512Hz. When the seconds register is  
being read, the DQ0 line will toggle at the 512Hz frequency as long as conditions for access remain valid  
(i.e., CE low, OE low, CE2 high, and address for seconds register remain valid and stable).  
4 of 16  
DS1643/DS1643P  
CLOCK ACCURACY (DIP MODULE)  
The DS1643 is guaranteed to keep time accuracy to within M1 minute per month at 25LC.  
CLOCK ACCURACY (POWERCAP MODULE)  
The DS1643P and DS9034PCX are each individually tested for accuracy. Once mounted together, the  
module is guaranteed to keep time accuracy to within M1.53 minutes per month (35ppm) at 25LC.  
Table 2. Register Map—Bank1  
DATA  
ADDRESS  
FUNCTION RANGE  
B7  
B6  
B5  
B4  
B3  
B2  
B1  
B0  
1FFF  
1FFE  
Year  
00-99  
01-12  
X
X
X
Month  
1FFD  
1FFC  
1FFB  
1FFA  
1FF9  
1FF8  
X
X
X
X
X
Ft  
X
X
X
X
X
X
Date  
Day  
01-31  
01-07  
00-23  
00-59  
00-59  
A
X
X
X
X
Hour  
R
Minutes  
Seconds  
Control  
OSC  
W
R = READ BIT  
X = UNUSED  
FT = FREQUENCY TEST  
OSC = STOP BIT  
W = WRITE BIT  
Note: All indicated “X” bits are not used but must be set to “0” for proper clock operation.  
RETRIEVING DATA FROM RAM OR CLOCK  
The DS1643 is in the read mode whenever WE (write enable) is high and CE (chip enable) is low. The  
device architecture allows ripple-through access to any of the address locations in the NV SRAM. Valid  
data will be available at the DQ pins within tAA after the last address input is stable, providing that the CE  
and OE access times and states are satisfied. If CE or OE access times are not met, valid data will be  
available at the latter of chip enable access (tCEA) or at output enable access time (tOEA). The state of the  
data input/output pins (DQ) is controlled by CE and OE . If the outputs are activated before tAA , the data  
lines are driven to an intermediate state until tAA. If the address inputs are changed while CE and OE  
remain valid, output data will remain valid for output data hold time (tOH) but will then go indeterminate  
until the next address access.  
WRITING DATA TO RAM OR CLOCK  
The DS1643 is in the write mode whenever WE and CE are in their active state. The start of a write is  
referenced to the latter occurring transition of WE or CE . The addresses must be held valid throughout  
the cycle. CE or WE must return inactive for a minimum of tWR prior to the initiation of another read or  
write cycle. Data in must be valid tDS prior to the end of write and remain valid for tDH afterward. In a  
typical application, the OE signal will be high during a write cycle. However, OE can be active provided  
that care is taken with the data bus to avoid bus contention. If OE is low prior to WE transitioning low  
the data bus can become active with read data defined by the address inputs. A low transition on WE will  
then disable the outputs tWEZ after WE goes active.  
5 of 16  
DS1643/DS1643P  
DATA RETENTION MODE  
When VCC is within nominal limits (VCC > 4.5V) the DS1643 can be accessed as described above with  
read or write cycles. However, when VCC is below the power-fail point VPF (point at which write  
protection occurs) the internal clock registers and RAM are blocked from access. This is accomplished  
internally by inhibiting access via the CE signal. At this time the power-on reset output signal (RST ) will  
be driven active low and will remain active until VCC returns to nominal levels. When VCC falls below the  
level of the internal battery supply, power input is switched from the VCC pin to the internal battery and  
clock activity, RAM, and clock data are maintained from the battery until VCC is returned to nominal  
level. The RST signal is an open drain output and requires a pull up. Except for the RST , all control, data,  
and address signals must be powered down when VCC is powered down.  
BATTERY LONGEVITY  
The DS1643 has a lithium power source that is designed to provide energy for clock activity, and clock  
and RAM data retention when the VCC supply is not present. The capability of this internal power supply  
is sufficient to power the DS1643 continuously for the life of the equipment in which it is installed. For  
specification purposes, the life expectancy is 10 years at 25LC with the internal clock oscillator running in  
the absence of VCC power. Each DS1643 is shipped from Dallas Semiconductor with its lithium energy  
source disconnected, guaranteeing full energy capacity. When VCC is first applied at a level greater than  
VPF, the lithium energy source is enabled for battery backup operation. Actual life expectancy of the  
Ds1643 will be much longer than 10 years since no lithium battery energy is consumed when VCC is  
present.  
6 of 16  
DS1643/DS1643P  
ABSOLUTE MAXIMUM RATINGS  
Voltage Range on Any Pin Relative to Ground……………………………………………..-0.3V to +7.0V  
Operating Temperature Range………………………………………………0°C to +70°C, Noncondensing  
Storage Temperature Range………………………………………………-40°C to +85°C, Noncondensing  
Soldering Temperature………………………………See IPC/JEDEC J-STD-020A Specification (Note 7)  
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation  
sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect  
reliability.  
RECOMMENDED DC OPERATING CONDITIONS  
(TA = 0LC to +70LC)  
PARAMETER  
SYMBOL MIN  
TYP  
5.0  
MAX  
UNITS NOTES  
Supply Voltage  
Logic 1 Voltage All Inputs  
Logic 0 Voltage All Inputs  
VCC  
VIH  
VIL  
4.5  
2.2  
-0.3  
5.5  
V
VCC + 0.3  
+0.8  
V
V
DC ELECTRICAL CHARACTERISTICS  
(VCC = 5.0V M10%, TA = 0LC toꢀꢁ70LC.)  
PARAMETER  
SYMBOL MIN  
TYP  
MAX  
UNITS NOTES  
Active Supply Current  
ICC  
15  
50  
mA  
2, 3  
TTL Standby Current  
(CE = VIH, CE2 = VIL)  
CMOS Standby Current  
(CE = VCC - 0.2V, CE2 = GND + 0.2V)  
Input Leakage Current (Any Input)  
Output Leakage Current (Any Output)  
Output Logic 1 Voltage  
(IOUT = -1.0mA)  
ICC1  
ICC2  
1
1
3
3
mA  
2, 3  
mA  
2, 3  
1
IIL  
IOL  
-1  
-1  
+1  
+1  
A  
A  
VOH  
2.4  
Output Logic 0 Voltage  
(IOUT = +2.1mA)  
Write Protection Voltage  
VOL  
VPF  
0.4  
1
1
4.25  
4.37  
4.50  
V
7 of 16  
DS1643/DS1643P  
AC CHARACTERISTICS—READ CYCLE  
(VCC = 5.0V M10%, TA = 0LC to +70LC.)  
70ns  
100ns  
PARAMETER  
SYMBOL  
ACCESS  
ACCESS  
UNITS NOTES  
MIN MAX MIN MAX  
Read Cycle Time  
Address Access Time  
tRC  
tAA  
70  
100  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
4
4
4
4
4
4
4
4
4
4
70  
100  
tCEL  
tCEA  
tCE2A  
tCEZ  
tOEL  
tOEA  
tOEZ  
tOH  
5
5
CE and CE2 to DQ Low-Z  
CE Access Time  
70  
80  
25  
100  
105  
35  
CE2 Access Time  
CE and CE2 Data Off Time  
OE to DQ Low-Z  
OE Access Time  
OE Data Off Time  
Output Hold from Address  
5
5
5
5
35  
25  
55  
35  
READ CYCLE TIMING DIAGRAM  
8 of 16  
DS1643/DS1643P  
AC CHARACTERISTICS—WRITE CYCLE  
(VCC = 5.0V M10%, TA = 0LC to +70LC.)  
70ns  
ACCESS  
100ns  
PARAMETER  
SYMBOL  
ACCESS  
UNITS NOTES  
MIN MAX MIN MAX  
Write Cycle Time  
Address Setup Time  
tWC  
tAS  
70  
0
100  
0
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
4
4
4
4
4
4
4
4
4
4
tWEW  
tCEW  
tCE2W  
tDS  
tDH  
tAH  
50  
60  
65  
30  
0
70  
75  
85  
40  
0
WE Pulse Width  
CE Pulse Width  
CE2 Pulse Width  
Data Setup Time  
Data Hold Time  
Address Hold Time  
5
5
tWEZ  
tWR  
25  
35  
WE Data Off Time  
Write Recovery Time  
5
5
9 of 16  
DS1643/DS1643P  
WRITE CYCLE TIMING DIAGRAM—WE CONTROLLED  
WRITE CYCLE TIMING DIAGRAMCE, CE2 CONTROLLED  
10 of 16  
DS1643/DS1643P  
POWER-UP/DOWN AC CHARACTERISTICS  
(VCC = 5.0V M10%, TA = 0LC to +70LC.)  
PARAMETER  
SYMBOL MIN  
TYP  
MAX  
UNITS NOTES  
CE or WE at VIH, CE2 at VIL, Before  
tPD  
0
s  
Power-down  
VCC Fall Time: VPF(MAX) to VPF(MIN)  
VCC Fall Time: VPF(MIN) to VBAT  
VCC Rise Time: VPF(MIN) to VPF(MAX)  
Power-Up Recover Time  
Expected Data Retention Time  
(Oscillator On)  
tF  
tFB  
tR  
300  
10  
0
s  
s  
s  
ms  
tREC  
35  
tDR  
10  
years  
5, 6  
POWER-UP/POWER-DOWN TIMING  
CAPACITANCE  
(TA = +25LC)  
PARAMETER  
SYMBOL MIN  
TYP  
MAX  
7
10  
UNITS NOTES  
Capacitance on All Pins  
Capacitance on All Output Pins  
CIN  
CO  
pF  
pF  
11 of 16  
DS1643/DS1643P  
AC TEST CONDITIONS  
Output Load: 100pF + 1TTL Gate  
Input Pulse Levels: 0 to 3.0V  
Timing Measurement Reference Levels:  
Input: 1.5V  
Output: 1.5V  
Input Pulse Rise and Fall Times: 5ns  
NOTES:  
1) Voltages are referenced to ground.  
2) Typical values are at +25LC and nominal supplies.  
3) Outputs are open.  
4) The CE2 control signal functions exactly the same as the CE signal except that the logic levels for  
active and inactive levels are opposite.  
5) Data retention time is at 25LC.  
6) Each DS1643 has a built-in switch that disconnects the lithium source until VCC is first applied by the  
user. The expected tDR is defined for DIP modules as a cumulative time in the absence of VCC starting  
from the time power is first applied by the user.  
7) Real-Time Clock Modules (DIP) can be successfully processed through conventional wave-soldering  
techniques as long as temperatures as long as temperature exposure to the lithium energy source  
contained within does not exceed +85LC. Post-solder cleaning with water washing techniques is  
acceptable, provided that ultrasonic vibration is not used.  
In addition, for the PowerCap:  
a. Dallas Semiconductor recommends that PowerCap Module bases experience one pass through  
solder reflow oriented with the label side up (“live-bug”).  
b. Hand soldering and touch-up: Do not touch or apply the soldering iron to leads for more than  
3 seconds. To solder, apply flux to the pad, heat the lead frame pad and apply solder. To  
remove the part, apply flux, heat the lead frame pad until the solder reflow and use a solder  
wick to remove solder.  
12 of 16  
DS1643/DS1643P  
PACKAGE INFORMATION  
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline  
information, go to www.maxim-ic.com/DallasPackInfo.)  
DS1643 28-PIN PACKAGE  
PKG  
DIM  
28-PIN  
MIN  
MAX  
A IN.  
MM  
1.470  
37.34  
0.675  
17.75  
0.315  
8.51  
1.490  
37.85  
0.740  
18.80  
0.335  
9.02  
B IN.  
MM  
C IN.  
MM  
D IN.  
MM  
0.075  
1.91  
0.105  
2.67  
E IN.  
MM  
0.015  
0.38  
0.030  
0.76  
F IN.  
MM  
0.140  
3.56  
0.180  
4.57  
G IN.  
MM  
0.090  
2.29  
0.110  
2.79  
H IN.  
MM  
0.590  
14.99  
0.010  
0.25  
0.015  
0.43  
0.630  
16.00  
0.018  
0.45  
0.025  
0.58  
J IN.  
MM  
K IN.  
MM  
13 of 16  
DS1643/DS1643P  
DS1643P  
PKG  
DIM  
A
INCHES  
NOM  
MIN  
MAX  
0.920  
0.980  
-
0.925  
0.985  
-
0.930  
0.990  
0.080  
0.058  
0.052  
0.025  
0.030  
B
C
D
0.052  
0.048  
0.015  
0.025  
0.055  
0.050  
0.020  
0.027  
E
F
G
NOTE: DALLAS SEMICONDUCTOR RECOMMENDS THAT  
POWERCAP MODULE BASES EXPERIENCE ONE PASS  
THROUGH SOLDER REFLOW ORIENTED WITH THE LABEL  
SIDE UP (“LIVE-BUG”).  
HAND SOLDERING AND TOUCH-UP: DO NOT TOUCH OR  
APPLY THE SOLDERING IRON TO LEADS FOR MORE THAN  
3 SECONDS.  
TO SOLDER, APPLY FLUX TO THE PAD, HEAT THE LEAD  
FRAME PAD AND APPLY SOLDER. TO REMOVE THE PART,  
APPLY FLUX, HEAT THE LEAD FRAME PAD UNTIL THE  
SOLDER REFLOWS AND USE A SOLDER WICK TO  
REMOVE SOLDER.  
14 of 16  
DS1643/DS1643P  
DS1643P WITH DS9034PCX ATTACHED  
PKG  
DIM  
A
INCHES  
NOM  
MIN  
MAX  
0.920  
0.955  
0.240  
0.052  
0.048  
0.015  
0.020  
0.925  
0.960  
0.245  
0.055  
0.050  
0.020  
0.025  
0.930  
0.965  
0.250  
0.058  
0.052  
0.025  
0.030  
B
C
D
E
F
G
15 of 16  
DS1643/DS1643P  
RECOMMENDED POWERCAP MODULE LAND PATTERN  
PKG  
DIM  
A
INCHES  
MIN  
NOM  
MAX  
-
-
-
-
-
1.050  
0.826  
0.050  
0.030  
0.112  
-
-
-
-
-
B
C
D
E
16 of 16  
Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product.  
No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time.  
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600  
© 2005 Maxim Integrated Products S Printed USA  
The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation.  
EN GL ISH ? ? ? ? ? ? ? ? ? ?  
W HA T ' S N EW PR ODUC TS S OLU TI ONS D E SI G N AP P NOT ES SUPP ORT  
BU Y C OM PA N Y M EM B ER S  
DS 1 64 3  
Pa r t Nu mb e r T ab l e  
N o te s:  
1 . S ee t he DS1 643 Quic kVie w D at a Sh ee t fo r fu r t h er i nf o rm a t i on on th i s p ro duc t f a mil y o r do wn lo a d t he  
DS 16 43 fu ll d ata s heet (P DF , 3 20 k B) .  
2. O th er o p ti on s an d l inks f or p urch asi ng p arts a re l is te d at : h t tp : / /w w w. m a xi m- ic. com /s al es .  
3 . Did n' t F ind W ha t Y ou N e ed ? Ask ou r a pplic a tion s e ngine e r s. Expe r t a ssi sta nc e i n fi ndi ng p arts, usu al l y w i th in  
o n e b u s i n e s s d ay .  
4 . Pa r t n u mb e r suf f ix e s: T o r T &R = ta p e a n d r e e l; + = Ro HS/le ad - fr e e ; # = RoH S/ lea d - e xe m p t. Mo r e : S e e fu l l  
da ta she e t o r P a r t Na m i n g C o n v en t i o n s .  
5 . * So m e p ac ka ge s h a ve v ar i at i o n s , li s t e d o n t h e dr aw in g. " P kgC od e /Va ri a tion " t ells which va ri ation the  
p r od u c t us e s .  
P art Num ber  
D S 1 6 4 3 - 8 5 +  
F re e  
Sa mp le  
B uy  
D i re c t  
T em p  
R oHS/L ead- Fr ee?  
Ma t e ri a l s A n a ly s is  
P a c ka g e : TY PE P INS S IZE  
D R A WI N G C O D E / V A R *  
MOD; 28 pi n;60 0  
Dwg : 5 6 - G 0 0 0 2 - 0 0 1 A (P D F )  
Use pkg code/ vari atio n: MDF 28+2 *  
0 C t o + 7 0 C Ro H S / Le a d -F re e: Yes  
Ma t e ri a l s A n a ly s is  
D S 1 6 4 3 - 1 0 0  
MOD; 28 pi n;60 0  
Dwg : 5 6 - G 0 0 0 2 - 0 0 1 A (P D F )  
Us e pkg cod e/ var iat io n: M DF 28 -2*  
0 C t o + 7 0 C Ro H S / Le a d -F re e: N o  
Ma t e ri a l s A n a ly s is  
D S 1 6 4 3 - 1 0 0 +  
MOD; 28 pi n;60 0  
Dwg : 5 6 - G 0 0 0 2 - 0 0 1 A (P D F )  
Use pkg code/ vari atio n: MDF 28+2 *  
0 C t o + 7 0 C Ro H S / Le a d -F re e: Yes  
Ma t e ri a l s A n a ly s is  
Did n' t F ind W ha t You N e ed ?  
CO NT ACT U S: SE ND US AN EMAI L  
Co p y rig h t 2 00 7 b y M a x im I n te g r a te d Pr o d u c ts , D a lla s S em i co n d u c to r Le ga l N ot i ce s P ri va c y P o l ic y  

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