Integrated Circuits (ICs)

CAT1021WI-25-GT3

Obsolete

ON Semiconductor

EEPROM SERIAL 2-KB I2C CPU SUPERVISOR

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Integrated Circuits (ICs)

CAT1021WI-25-GT3

Obsolete

ON Semiconductor

EEPROM SERIAL 2-KB I2C CPU SUPERVISOR

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DocumentsDatasheet

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	CAT1021WI-25-GT3

Mounting Type	Surface Mount
Number of Voltages Monitored	1
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-40 °C
Output	Open Drain or Open Collector
Package / Case	8-SOIC
Package / Case [x]	0.154 in
Package / Case [y]	3.9 mm
Reset	Active High/Active Low
Reset Timeout	130 ms
Supplier Device Package	8-SOIC
Type	Simple Reset/Power-On Reset
Voltage - Threshold	2.55 V

CAT1021 Series

EEPROM Serial 2-Kb I2C CPU Supervisor

Part	Voltage - Threshold	Mounting Type	Output	Operating Temperature [Max]	Operating Temperature [Min]	Reset Timeout	Type	Reset	Supplier Device Package	Package / Case	Package / Case [y]	Package / Case [x]	Number of Voltages Monitored	Package / Case	Package / Case
ON Semiconductor CAT1021WI42	4.25 V	Surface Mount	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-SOIC	8-SOIC	3.9 mm	0.154 in	1
ON Semiconductor CAT1021WI-45-GT3	4.5 V	Surface Mount	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-SOIC	8-SOIC	3.9 mm	0.154 in	1
ON Semiconductor CAT1021WI-25-A2	2.55 V 2.7 V	Surface Mount	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-SOIC	8-SOIC	3.9 mm	0.154 in	1
ON Semiconductor CAT1021WI-42-GT3	4.25 V	Surface Mount	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-SOIC	8-SOIC	3.9 mm	0.154 in	1
ON Semiconductor CAT1021WI-30-GT3	3 V	Surface Mount	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-SOIC	8-SOIC	3.9 mm	0.154 in	1
ON Semiconductor CAT1021WI-25-T3	2.55 V	Surface Mount	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-SOIC	8-SOIC	3.9 mm	0.154 in	1
ON Semiconductor CAT1021WI25	2.55 V 2.7 V	Surface Mount	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-SOIC	8-SOIC	3.9 mm	0.154 in	1
ON Semiconductor CAT1021LI-42-G	4.25 V	Through Hole	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-PDIP	8-DIP			1	0.3 in	7.62 mm
ON Semiconductor CAT1021WI-25-GT3	2.55 V	Surface Mount	Open Drain or Open Collector	85 °C	-40 °C	130 ms	Simple Reset/Power-On Reset	Active High/Active Low	8-SOIC	8-SOIC	3.9 mm	0.154 in	1
ON Semiconductor CAT1021WI-30-G

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Description

General part information

CAT1021 Series

The CAT1021 is a complete memory and supervisory solution for microcontroller based systems. A EEPROM Serial 2-Kb I2C CPU Supervisor 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.The CAT1021 provides a precision VCCsense circuit and two open drain outputs: one (RESET) drives high and the other (RESET) drives low whenever VCCfalls below the reset threshold voltage. The CAT1021 also has a Write Protect input (WP). Write operations are disabled if WP is connected to a logic high.The supervisor has 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. The watchdog timer monitors the SDA signal.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 5.0 V, 3.3 V and 3.0 V systems. If power supply voltages are out of tolerance reset signals become active, preventing the system microcontroller, ASIC or peripherals from operating. Reset signals become inactive typically 200 ms after the supply voltage exceeds the reset threshold level. With both active high and low reset signals, interface to microcontrollers and other ICs is simple. In addition, theRESETpin or a separate input,MR, can be used as an input for push-button manual reset capability.The on-chip, 2 k-bit EEPROM memory features a 16-byte page. In addition, hardware data protection is provided by a VCCsense circuit that prevents writes to memory whenever VCCfalls below the reset threshold or until VCCreaches the reset threshold during power up.Available packages include an 8-pin DIP, 8-pin SOIC, 8-pin TSSOP, 8-pin TDFN and 8-pin MSOP. The TDFN packa

Documents

Technical documentation and resources