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CAT24C322 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT24C322
Beschreibung Supervisory Circuits with I2C Serial CMOS E2PROM/ Precision Reset Controller and Watchdog Timer
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 12 Seiten
CAT24C322 Datasheet, Funktion
Advanced
CAT24C321/322(32K), CAT24C641/642(64K)
Supervisory Circuits with I2C Serial CMOS E2PROM, Precision Reset Controller and Watchdog Timer
FEATURES
s Watchdog Timer on SDA for 24C321/641
s Programmable Reset Threshold
s 400 KHz I2C Bus Compatible
s 2.7 to 6 Volt Operation
s Low Power CMOS Technology
s 32 - Byte Page Write Buffer
s Built-in inadvertent write protection
— VCC Lock Out
DESCRIPTION
The CAT24CXXX is a single chip solution to three
popular functions of EEPROM memory, precision reset
controller and watchdog timer. The 24C321/322(32K)
and 24C641/642(64K) feature a I2C Serial CMOS
EEPROM. Catalyst's advanced CMOS technology sub-
stantially reduces device power requirements. The
24CXXX features a 32-byte page and is available in 8-pin
DIP or 8-pin SOIC packages.
PIN CONFIGURATION
24C321/322*
24C641/642*
DC
RESET
WP
VSS
VCC
RESET
SCL
SDA
*All products offered in P and J packages
PIN FUNCITONS
Pin Name
SDA
RESET/RESET
SCL
Vcc
DC
VSS
WP
Function
Serial Data/Address
Reset I/O
Clock Input
Power Supply
Do not Connect
Ground
Write Protect
s Active High or Low Reset Outputs
— Precision Power Supply Voltage Monitoring
— 5V, 3.3V and 3V options
s 1,000,000 Program/Erase Cycles
s 100 Year Data Retention
s 8-Pin DIP or 8-Pin SOIC
s Commercial, Industrial and Automotive
Temperature Ranges
The reset function of the 24CXXX protects the system
during brown out and power up/down conditions. During
system failure the watchdog timer feature protects the
microcontroller with a reset signal. 24CXXX features
active low reset on pin 2 and active high reset on pin 7.
24C321/641 features watchdog timer on the SDA line.
24C322/642 does not feature the watchdog timer func-
tion.
BLOCK DIAGRAM
EXTERNAL LOAD
VCC
VSS
DOUT
ACK
WORD ADDRESS
BUFFERS
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
SDA
START/STOP
LOGIC
XDEC
E2PROM
CONTROL
WP LOGIC
Only for
24C321/641
RESET Controller
High
Precision
WATCHDOG
Vcc Monitor
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
SCL
© 1998 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
9-1
RESET/RESET
24C1601 BLOCK
Doc. No. 25083-00 12/98






CAT24C322 Datasheet, Funktion
CAT24C321/322/641/642
Advanced
Hardware Data Protection
Reset Threshold Voltage
The 24CXXX is designed with the following hardware
data protection features to provide a high degree of data
integrity.
(1) The 24CXXX features a WP pin. When WP pin is tied
high the entire memory array becomes write protected
(read only).
(2) The VCC sense provides write protection when VCC
falls below the reset threshold value (VTH). The VCC lock
out inhibits writes to the serial EEPROM whenever VCC
falls below (power down) VTH or until VCC reaches the
reset threshold (power up) VTH.
From the factory the 24CXXX is offered in five different
variations of reset threshold voltages. They are 4.50-
4.75V, 4.25-4.50V, 3.00-3.15V, 2.85-3.00V and 2.55-
2.70V. To provide added flexibility to design engineers
using this product, the 24CXXX is designed with an
additional feature of programming the reset threshold
voltage. This allows the user to change the existing
reset threshold voltage to one of the other four reset
threshold voltages. Once the reset threshold voltage is
selected it will not change even after cycling the power,
unless the user uses the programmer to change the
reset threshold voltage. However, the programming
function is available only through third party programmer
manufacturers. Please call Catalyst for a list of program-
mer manufacturers who support this function.
Figure 2. Bus Timing
tF tHIGH tR
tLOW
tLOW
SCL
tSU:STA
tHD:DAT
tHD:STA
tSU:DAT
SDA IN
SDA OUT
tAA tDH
tSU:STO
tBUF
Figure 3. Write Cycle Timing
SCL
SDA
8TH BIT
BYTE n
ACK
Figure 4. Start/Stop Timing
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
SDA
SCL
Doc. No. 25083-00 12/98
START BIT
6
STOP BIT

6 Page









CAT24C322 pdf, datenblatt
CAT24C321/322/641/642
Advanced
Doc. No. 25083-00 12/98
12

12 Page





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