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CAT24C323J-30TE13 View Datasheet(PDF) - Catalyst Semiconductor => Onsemi

Part NameCAT24C323J-30TE13 Catalyst
Catalyst Semiconductor => Onsemi Catalyst
DescriptionSupervisory circuits with I2C serial CMOS E2EPROM, precision reset controller and watchdog timer
CAT24C323J-30TE13 Datasheet PDF : 12 Pages
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Advanced
CAT24C323/643
PIN DESCRIPTIONS
WDI: WATCHDOG INPUT
If there is no transition on the WDI for more than 1.6
seconds, the watchdog timer times out.
WP: WRITE PROTECT
If the pin is tied to VCC the entire memory array becomes
Write Protected (READ only). When the pin is tied to VSS
or left floating normal read/write operations are allowed
to the device.
SCL: SERIAL CLOCK
The serial clock input clocks all data transferred into or
out of the device.
RESET/RESET: RESET I/O
These are open drain pins and can be used as reset
trigger inputs. By forcing a reset condition on the pins the
device will initiate and maintain a reset condition for
approximately 200ms. RESET pin must be connected
through a pull-down and RESET pin must be connected
through a pull-up device.
SDA: SERIAL DATA/ADDRESS
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA pin
is an open drain output and can be wire-ORed with other
open drain or open collector outputs.
DEVICE OPERATION
Reset Controller Description
The CAT24CXXX provides a precision RESET control-
ler that ensures correct system operation during brown-
out and power up/down conditions. It is configured
with open drain RESET outputs. During power-up, the
RESET outputs remain active until VCC reaches the
VTH threshold and will continue driving the outputs for
approximately 200ms (tPURST) after reaching VTH. After
the tPURST timeout interval, the device will cease to drive
reset outputs. At this point the reset outputs will be pulled
up or down by their respective pull up/pull down devices.
During power-down, the RESET outputs will begin driv-
ing active when VCC falls below VTH. The RESET
outputs will be valid so long as VCC is >1.0V (VRVALID).
The RESET pins are I/Os; therefore, the CAT24CXXX
can act as a signal conditioning circuit for an externally
applied reset. The inputs are level triggered; that is, the
RESET input in the 24CXXX will initiate a reset timeout
after detecting a high and the RESET input in the
24CXXX will initiate a reset timeout after detecting a low.
Watchdog Timer
The Watchdog Timer provides an independent protec-
tion for microcontrollers. During a system failure, the
CAT24CXXX will respond with a reset signal after a
time-out interval of 1.6 seconds for a lack of activity. The
24C323/643 is designed with a WDI input pin for the
Watchdog Timer function. For the 24C323/643, if the
microcontroller does not toggle the WDI input pin within
1.6 seconds, the Watchdog Timer times out. This will
generate a reset condition on reset outputs. The Watch-
dog Timer is cleared by any transition on WDI.
As long as the reset signal is asserted, the Watchdog
Timer will not count and will stay cleared.
Figure 1. RESET Output Timing
t
GLITCH
VTH
VRVALID
VCC
tPURST
t RPD
tPURST
RESET
t RPD
RESET
Doc. No. 25084-00 12/98
5
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CAT24C323(32K), CAT24C643 (64K)

DESCRIPTION
The CAT24C323/643 is a single chip solution to three popular functions of EEPROM memory, precision reset controller and watchdog timer. The 24C323(32K) and 24C643 (64K) feature a I
2C Serial CMOS EEPROM Catalyst advanced CMOS technology substantially reduces device power requirements. The 24C323/643 features a 32-byte page and is available in 8-pin DIP or 8-pin SOIC packages.The reset function of the 24C323/643 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. 24C323 features active low reset on pin 2 and active high reset on pin 7. 24C323/643 features watchdog timer on the WDI input pin (pin 1).

FEATURES
■Watchdog Timer Input (WDI)
■ Programmable Reset Threshold
■ 400 KHz I2C Bus Compatible
■ 2.7 to 6 Volt Operation
■ Low Power CMOS Technology
■ 32 - Byte Page Write Buffer
■Built-in inadvertent write protection
— VCC Lock Out
■  Active High or Low Reset Outputs
— Precision Power Supply Voltage Monitoring
—  5V, 3.3V and 3V options
■ 1,000,000 Program/Erase Cycles
■ 100 Year Data Retention
■8-Pin DIP or 8-Pin SOIC
■Commercial, Industrial and Automotive Temperature Ranges

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