EEPROM
CAT1021, CAT1022, CAT1023
Supervisory Circuits with EEPROM Serial 2k-bit I2C Manual Reset and Watchdog Timer
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Description
CAT1021, CAT1022, CAT1023
Supervisory Circuits with EEPROM Serial 2k-bit I2C Manual Reset and Watchdog Timer
www.onsemi.com
Description
The CAT1021, CAT1022 and CAT1023 are complete memory and
supervisory solutions for microcontroller−based systems. A EEPROM
Serial 2k−bit I2C memory and a system power supervisor with
brown−out protection are integrated together in low power CMOS technology. Memory interface is via a 400 kHz I2C bus.
SOIC−8 CASE 751BD
TSSOP−8 CASE 948S
The CAT1021 and CAT1023 provide a precision VCC sense circuit
and two open drain outputs: one (RESET) drives high and the other
(RESET) drives low whenever VCC falls below the reset threshold
voltage. The CAT1022 has only a RESET output and does not have a Write Protect input. The CAT1021 also has a Write Protect input (WP). Write operations are disabled if WP is connected to a logic high.
MSOP−8 CASE 846AD
TDFN−8 CASE 511AL
All supervisors have a 1.6 second watchdog timer circuit that resets
a system to a known state if software or a hardware glitch halts or
“hangs” the system. For the CAT1021 and CAT1022, the watchdog
ORDERING INFORMATION
timer monitors the SDA signal. The CAT1023 has a separate watchdog timer interrupt input pin, WDI.
For Ordering Information details, see page 13.
The power supply monitor and reset circuit protect memory and
system controllers during power up/down and against brownout
conditions. Five reset threshold voltages support 5 V, 3.3 V and 3 V
systems. If pow...
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