DS21054E [MICROCHIP]
16K 1.8V I2C SERIAL EEPROM; 16K 1.8V I2C串行EEPROM型号: | DS21054E |
厂家: | MICROCHIP |
描述: | 16K 1.8V I2C SERIAL EEPROM |
文件: | 总12页 (文件大小:79K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
24AA16
2
16K 1.8V I C Serial EEPROM
PACKAGE TYPES
PDIP
FEATURES
• Single supply with operation down to 1.8V
• Low power CMOS technology
A0
1
8
7
VCC
WP
- 1 mA active current typical
A1
2
- 10 µA standby current typical at 5.5V
- 3 µA standby current typical at 1.8V
• Organized as 8 blocks of 256 bytes (8 x 256 x 8)
• 2-wire serial interface bus, I2C compatible
A2
3
4
6
5
SCL
SDA
VSS
• Schmitt trigger, filtered inputs for noise suppres-
sion
• Output slope control to eliminate ground bounce
• 100 kHz (1.8V) and 400 kHz (5V) compatibility
• Self-timed write cycle (including auto-erase)
• Page-write buffer for up to 16 bytes
8-lead
SOIC
1
8
7
A0
A1
VCC
2
3
4
WP
• 2 ms typical write cycle time for page-write
• Hardware write protect for entire memory
• Can be operated as a serial ROM
6
5
A2
SCL
SDA
VSS
• ESD protection > 4,000V
• 10,000,000 erase/write cycles guaranteed
• Data retention > 200 years
14-lead SOIC
14
1
2
3
4
5
6
7
• 8-pin DIP, 8-lead or 14-lead SOIC packages
• Available for extended temperature ranges
NC
NC
A0
13
12
11
V
CC
- Commercial (C):
- Industrial (I):
0˚C to +70°C
-40°C to +85°C
WP
NC
A1
NC
DESCRIPTION
10
9
SCL
SDA
NC
A2
The Microchip Technology Inc. 24AA16 is a 1.8 volt 16K
bit Electrically Erasable PROM. The device is orga-
nized as eight blocks of 256 x 8-bit memory with a 2-
wire serial interface. Low voltage design permits oper-
ation down to 1.8 volts with standby and active currents
of only 3 µA and 1 mA, respectively. The 24AA16 also
has a page-write capability for up to 16 bytes of data.
The 24AA16 is available in the standard 8-pin DIP and
both 8-lead and 14-lead surface mount SOIC pack-
ages.
V
SS
8
NC
BLOCK DIAGRAM
WP
HV GENERATOR
I/O
MEMORY
CONTROL
LOGIC
EEPROM
ARRAY
CONTROL
LOGIC
XDEC
PAGE LATCHES
SDA
SCL
YDEC
VCC
VSS
SENSE AMP
R/W CONTROL
I2C is a trademark of Philips Corporation.
1996 Microchip Technology Inc.
DS21054E-page 1
24AA16
TABLE 1-1:
Name
PIN FUNCTION TABLE
Function
1.0
ELECTRICAL CHARACTERISTICS
1.1
Maximum Ratings*
VSS
SDA
Ground
VCC...................................................................................7.0V
All inputs and outputs w.r.t. VSS .................-0.6V to VCC +1.0V
Storage temperature ..................................... -65˚C to +150˚C
Ambient temp. with power applied ................ -65˚C to +125˚C
Soldering temperature of leads (10 seconds) ............. +300˚C
ESD protection on all pins..................................................≥ 4 kV
Serial Address/Data I/O
Serial Clock
SCL
WP
Write Protect Input
+1.8V to 5.5V Power Supply
No Internal Connection
VCC
A0, A1, A2
*Notice: Stresses above those listed under “Maximum ratings”
may cause permanent damage to the device. This is a stress rat-
ing only and functional operation of the device at those or any
other conditions above those indicated in the operational listings
of this specification is not implied. Exposure to maximum rating
conditions for extended periods may affect device reliability
TABLE 1-2:
DC CHARACTERISTICS
VCC = 1.8V to +5.5V
Commercial (C): Tamb = 0˚C to +70˚C
Industrial (I):
Tamb = -40°C to +85°C
Parameter
Symbol
Min
Typ
Max Units Conditions
WP, SCL and SDA pins:
High level input voltage
VIH
VIL
.7 VCC
—
—
.3 VCC
—
V
V
Low level input voltage
Hysteresis of Schmitt trigger inputs
Low level output voltage
Input leakage current
VHYS
VOL
ILI
.05 VCC
—
V
(Note)
.40
10
V
IOL = 3.0 mA, VCC = 1.8V
VIN = .1V to VCC
VOUT = .1V to VCC
-10
µA
µA
Output leakage current
ILO
-10
10
Pin capacitance
(all inputs/outputs
CIN,
COUT
—
10
pF VCC = 5.0V (Note 1)
Tamb = 25˚C, FCLK = 1 MHz
Operating current
ICC Write
—
—
—
—
—
0.5
—
3
—
1
mA VCC = 5.5V, SCL = 400 kHz
mA VCC = 1.8V, SCL = 100 kHz
mA VCC = 5.5V, SCL = 400 kHz
mA VCC = 1.8V, SCL = 100 kHz
ICC Read
0.05
—
Standby current
ICCS
—
—
—
—
—
3
100
30
—
µA VCC = 5.5V, SDA=SCL=VCC
µA VCC = 3.0V, SDA=SCL=VCC
µA VCC = 1.8V, SDA=SCL=VCC
Note: This parameter is periodically sampled and not 100% tested.
FIGURE 1-1: BUS TIMING START/STOP
VHYS
SCL
THD:STA
TSU:STA
TSU:STO
SDA
START
STOP
DS21054E-page 2
1996 Microchip Technology Inc.
24AA16
TABLE 1-3:
AC CHARACTERISTICS
STANDARD
MODE
VCC = 4.5-5.5V
FAST MODE
Parameter
Symbol
Units
Remarks
Min
Max
Min
Max
Clock frequency
FCLK
THIGH
TLOW
TR
—
4000
4700
—
100
—
—
600
1300
—
400
—
kHz
ns
Clock high time
Clock low time
—
—
ns
SDA and SCL rise time
SDA and SCL fall time
1000
300
—
300
300
—
ns
(Note 1)
(Note 1)
TF
—
—
ns
START condition hold
time
THD:STA
4000
600
ns
After this period the first
clock pulse is generated
START condition setup
time
TSU:STA
4700
—
600
—
ns
Only relevant for repeated
START condition
Data input hold time
Data input setup time
THD:DAT
TSU:DAT
TSU:STO
0
—
—
—
0
—
—
—
ns
ns
ns
250
4000
100
600
STOP condition setup
time
Output valid from clock
Bus free time
TAA
—
3500
—
—
900
—
ns
ns
(Note 2)
TBUF
4700
1300
Time the bus must be free
before a new transmission
can start
Output fall time from VIH
min to VIL max
TOF
TSP
—
—
250
50
20 +0.1
CB
250
50
ns
ns
(Note 1), CB ≤ 100 pF
Input filter spike suppres-
sion (SDA and SCL pins)
—
(Note 3)
Write cycle time
Endurance
TWR
—
—
10
—
—
10
—
ms
Byte or Page mode
10M
10M
cycles 25°C, Vcc = 5.0V, Block
Mode (Note 4)
Note 1: Not 100% tested. CB = total capacitance of one bus line in pF.
2: As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of START or STOP conditions
3: The combined TSP and VHYS =specifications are due to new Schmitt trigger inputs which provide improved
noise and spike suppression. This eliminates the need for a TI specification for standard operation.
4: This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific appli-
cation, please consult the Total Endurance Model which can be obtained on our BBS or website.
FIGURE 1-2: BUS TIMING DATA
TR
TF
THIGH
TLOW
SCL
TSU:STA
THD:DAT
TSU:DAT
TSU:STO
THD:STA
SDA
IN
TSP
TBUF
TAA
TAA
THD:STA
SDA
OUT
1996 Microchip Technology Inc.
DS21054E-page 3
24AA16
3.4
Data Valid (D)
2.0
FUNCTIONAL DESCRIPTION
The 24AA16 supports a Bi-directional 2-wire bus and
data transmission protocol. A device that sends data
onto the bus is defined as transmitter, and a device
receiving data as receiver. The bus has to be controlled
by a master device which generates the serial clock
(SCL), controls the bus access, and generates the
START and STOP conditions, while the 24AA16 works
as slave. Both, master and slave can operate as trans-
mitter or receiver but the master device determines
which mode is activated.
The state of the data line represents valid data when,
after a START condition, the data line is stable for the
duration of the HIGH period of the clock signal.
The data on the line must be changed during the LOW
period of the clock signal. There is one clock pulse per
bit of data.
Each data transfer is initiated with a START condition
and terminated with a STOP condition. The number of
the data bytes transferred between the START and
STOP conditions is determined by the master device
and is theoretically unlimited, although only the last 16
will be stored when doing a write operation. When an
overwrite does occur it will replace data in a first in first
out fashion.
3.0
BUS CHARACTERISTICS
The following bus protocol has been defined:
• Data transfer may be initiated only when the bus is
not busy.
• During data transfer, the data line must remain
stable whenever the clock line is HIGH. Changes
in the data line while the clock line is HIGH will be
interpreted as a START or STOP condition.
3.5
Acknowledge
Each receiving device, when addressed, is obliged to
generate an acknowledge after the reception of each
byte. The master device must generate an extra clock
pulse which is associated with this acknowledge bit.
Accordingly, the following bus conditions have been
defined (Figure 3-1).
Note: The 24AA16 does not generate any
acknowledge bits if an internal program-
ming cycle is in progress.
3.1
Bus not Busy (A)
Both data and clock lines remain HIGH.
The device that acknowledges, has to pull down the
SDA line during the acknowledge clock pulse in such a
way that the SDA line is stable LOW during the HIGH
period of the acknowledge related clock pulse. Of
course, setup and hold times must be taken into
account. A master must signal an end of data to the
slave by not generating an acknowledge bit on the last
byte that has been clocked out of the slave. In this
case, the slave must leave the data line HIGH to enable
the master to generate the STOP condition.
3.2
Start Data Transfer (B)
A HIGH to LOW transition of the SDA line while the
clock (SCL) is HIGH determines a START condition. All
commands must be preceded by a START condition.
3.3
Stop Data Transfer (C)
A LOW to HIGH transition of the SDA line while the
clock (SCL) is HIGH determines a STOP condition. All
operations must be ended with a STOP condition.
FIGURE 3-1: DATA TRANSFER SEQUENCE ON THE SERIAL BUS
(A)
(B)
(D)
(D)
(C)
(A)
SCL
SDA
START
CONDITION
STOP
CONDITION
ADDRESS OR
ACKNOWLEDGE
VALID
DATA
ALLOWED
TO CHANGE
DS21054E-page 4
1996 Microchip Technology Inc.
24AA16
3.6
Device Addressing
4.0
WRITE OPERATION
A control byte is the first byte received following the start
condition from the master device. The control byte con-
sists of a 4-bit control code, for the 24AA16 this is set as
1010 binary for read and write operations. The next three
bits of the control byte are the block select bits (B2, B1,
B0). They are used by the master device to select which
of the eight 256 word blocks of memory are to be
accessed. These bits are in effect the three most signifi-
cant bits of the word address. It should be noted that the
protocol limits the size of the memory to eight blocks of
256 words, therefore the protocol can support only one
24AA16 per system.
4.1
Byte Write
Following the start condition from the master, the
device code (4 bits), the block address (3 bits), and the
R/W bit which is a logic low is placed onto the bus by
the master transmitter. This indicates to the addressed
slave receiver that a byte with a word address will follow
after it has generated an acknowledge bit during the
ninth clock cycle. Therefore the next byte transmitted by
the master is the word address and will be written into
the address pointer of the 24AA16. After receiving
another acknowledge signal from the 24AA16 the mas-
ter device will transmit the data word to be written into
the addressed memory location. The 24AA16 acknowl-
edges again and the master generates a stop condi-
tion. This initiates the internal write cycle, and during
this time the 24AA16 will not generate acknowledge
signals (Figure 4-1).
The last bit of the control byte defines the operation to
be performed. When set to one a read operation is
selected, when set to zero a write operation is selected.
Following the start condition, the 24AA16 monitors the
SDA bus checking the device type identifier being
transmitted, upon a 1010 code the slave device outputs
an acknowledge signal on the SDA line. Depending on
the state of the R/W bit, the 24AA16 will select a read
or write operation.
4.2
Page Write
Control
Code
The write control byte, word address and the first data
byte are transmitted to the 24AA16 in the same way as
in a byte write. But instead of generating a stop condi-
tion the master transmits up to sixteen data bytes to the
24AA16 which are temporarily stored in the on-chip
page buffer and will be written into the memory after the
master has transmitted a stop condition. After the
receipt of each word, the four lower order address
pointer bits are internally incremented by one. The
higher order seven bits of the word address remains
constant. If the master should transmit more than 16
words prior to generating the stop condition, the
address counter will roll over and the previously
received data will be overwritten. As with the byte write
operation, once the stop condition is received an inter-
nal write cycle will begin (Figure 4-2).
Operation
Block Select
R/W
Read
Write
1010
1010
Block Address
Block Address
1
0
FIGURE 3-2: CONTROL BYTE
ALLOCATION
START
READ/WRITE
SLAVE ADDRESS
R/W
A
1
0
1
0
B2
B1
B0
X = Don’t care
FIGURE 4-1: BYTE WRITE
S
T
A
R
T
S
BUS ACTIVITY
MASTER
CONTROL
BYTE
WORD
ADDRESS
T
DATA
O
P
SDA LINE
S
P
A
C
K
A
C
K
A
C
K
BUS ACTIVITY
FIGURE 4-2: PAGE WRITE
S
S
T
O
P
T
BUS ACTIVITY
MASTER
A
R
T
CONTROL
BYTE
WORD
ADDRESS (n)
DATA n
DATA n + 1
DATA n + 15
SDA LINE
S
P
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
BUS ACTIVITY
1996 Microchip Technology Inc.
DS21054E-page 5
24AA16
5.0
ACKNOWLEDGE POLLING
7.0
READ OPERATION
Since the device will not acknowledge during a write
cycle, this can be used to determine when the cycle is
complete (this feature can be used to maximize bus
throughput). Once the stop condition for a write com-
mand has been issued from the master, the device ini-
tiates the internally timed write cycle. ACK polling can
be initiated immediately. This involves the master send-
ing a start condition followed by the control byte for a
write command (R/W = 0). If the device is still busy with
the write cycle, then no ACK will be returned. If the
cycle is complete, then the device will return the ACK
and the master can then proceed with the next read or
write command. See Figure 5-1 for flow diagram.
Read operations are initiated in the same way as write
operations with the exception that the R/W bit of the
slave address is set to one. There are three basic types
of read operations: current address read, random read,
and sequential read.
7.1
Current Address Read
The 24AA16 contains an address counter that main-
tains the address of the last word accessed, internally
incremented by one. Therefore, if the previous access
(either a read or write operation) was to address n, the
next current address read operation would access data
from address n + 1. Upon receipt of the slave address
with R/W bit set to one, the 24AA16 issues an acknowl-
edge and transmits the 8-bit data word. The master will
not acknowledge the transfer but does generate a stop
condition and the 24AA16 discontinues transmission
(Figure 7-1).
FIGURE 5-1: ACKNOWLEDGE POLLING
FLOW
Send
Write Command
7.2
Random Read
Send Stop
Condition to
Random read operations allow the master to access
any memory location in a random manner. To perform
this type of read operation, first the word address must
be set. This is done by sending the word address to the
24AA16 as part of a write operation. After the word
address is sent, the master generates a start condition
following the acknowledge. This terminates the write
operation, but not before the internal address pointer is
set. Then the master issues the control byte again but
with the R/W bit set to a one. The 24AA16 will then
issue an acknowledge and transmits the eight bit data
word. The master will not acknowledge the transfer but
does generate a stop condition and the 24AA16 discon-
tinues transmission (Figure 7-2).
Initiate Write Cycle
Send Start
Send Control Byte
with R/W = 0
Did Device
NO
Acknowledge
7.3
Sequential Read
(ACK = 0)?
Sequential reads are initiated in the same way as a ran-
dom read except that after the 24AA16 transmits the
first data byte, the master issues an acknowledge as
opposed to a stop condition in a random read. This
directs the 24AA16 to transmit the next sequentially
addressed 8-bit word (Figure 7-3).
YES
Next
Operation
6.0
WRITE PROTECTION
To provide sequential reads the 24AA16 contains an
internal address pointer which is incremented by one at
the completion of each operation. This address pointer
allows the entire memory contents to be serially read
during one operation.
The 24AA16 can be used as a serial ROM when the
WP pin is connected to VCC. Programming will be inhib-
ited and the entire memory will be write-protected.
7.4
Noise Protection
The 24AA16 employs a VCC threshold detector circuit
which disables the internal erase/write logic if the VCC
is below 1.5 volts at nominal conditions.
The SCL and SDA inputs have Schmitt trigger and filter
circuits which suppress noise spikes to assure proper
device operation even on a noisy bus.
DS21054E-page 6
1996 Microchip Technology Inc.
24AA16
FIGURE 7-1: CURRENT ADDRESS READ
S
T
O
P
S
T
A
R
T
BUS ACTIVITY
MASTER
CONTROL
BYTE
DATA n
SDA LINE
S
P
A
C
K
N
O
BUS ACTIVITY
A
C
K
FIGURE 7-2: RANDOM READ
S
T
O
P
S
T
A
R
T
S
T
A
R
T
BUS ACTIVITY
MASTER
CONTROL
BYTE
WORD
ADDRESS (n)
CONTROL
BYTE
DATA (n)
S
P
S
SDA LINE
A
C
K
A
C
K
A
C
K
N
O
BUS ACTIVITY
A
C
K
FIGURE 7-3: SEQUENTIAL READ
S
T
O
P
BUS ACTIVITY
MASTER
CONTROL
BYTE
DATA n
DATA n + 1
DATA n + 2
DATA n + X
SDA LINE
P
A
C
K
A
C
K
A
C
K
A
C
K
N
O
BUS ACTIVITY
A
C
K
8.3
WP
8.0
PIN DESCRIPTIONS
This pin must be connected to either VSS or VCC.
8.1
SDA Serial Address/Data Input/Output
If tied to VSS, normal memory operation is enabled
(read/write the entire memory).
This is a Bi-directional pin used to transfer addresses
and data into and data out of the device. It is an open
drain terminal, therefore the SDA bus requires a pullup
resistor to VCC (typical 10KΩ for 100 kHz, 1KΩ for 400
kHz) from 24LC04B/08B.
If tied to VCC, WRITE operations are inhibited. The
entire memory will be write-protected. Read operations
are not affected.
This feature allows the user to use the 24AA16 as a
serial ROM when WP is enabled (tied to VCC).
For normal data transfer SDA is allowed to change only
during SCL low. Changes during SCL high are
reserved for indicating the START and STOP condi-
tions.
8.4
A0, A1, A2
These pins are not used by the 24AA16. They may be
left floating or tied to either VSS or VCC.
8.2
SCL Serial Clock
This input is used to synchronize the data transfer from
and to the device.
1996 Microchip Technology Inc.
DS21054E-page 7
24AA16
NOTE:
DS21054E-page 8
1996 Microchip Technology Inc.
24AA16
NOTES:
1996 Microchip Technology Inc.
DS21054E-page 9
24AA16
NOTES:
DS21054E-page 10
1996 Microchip Technology Inc.
24AA16
24AA16 Product Identification System
To order or to obtain information (e.g., on pricing or delivery), please use the listed part numbers, and refer to the factory or the listed
sales offices.
24AA16
-
/P
Package:
P = Plastic DIP (300 mil Body), 8-lead
SL = Plastic SOIC (150 mil Body), 14-lead
SN = Plastic SOIC (150 mil Body), 8-lead
Temperature
Range:
Blank = 0°C to +70°C
I = -40°C to +85°C
2
Device:
24AA16
24AA16T
1.8K, 16K I C Serial EEPROM
2
1.8K, 16K I C Serial EEPROM (Tape and Reel)
1996 Microchip Technology Inc
DS21054E-page 11
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9/3/96
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All rights reserved. 1996, Microchip Technology Incorporated, USA. 9/96
Printed on recycled paper.
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DS21054E-page 12
1996 Microchip Technology Inc.
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