Datasheet > CAT1021

CAT1021

更新时间： 2022-11-24 21:41:49

品牌	Logo	应用领域
CATALYST		监控可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数	文件大小	规格书
20页	149K
描述
Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer

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CAT1021 数据手册

CAT1021, CAT1022, CAT1023

Supervisory Circuits with I²C Serial 2k-bit CMOS EEPROM, Manual Reset

and Watchdog Timer

FEATURES

■ Precision power supply voltage monitor

— 5V, 3.3V and 3V systems

— Five threshold voltage options

■ Watchdog timer

■ Built-in inadvertent write protection

— WP pin (CAT1021)

■ 1,000,000 Program/Erase cycles

■ Manual reset input

■ Active high or low reset

— Valid reset guaranteed at V_CC= 1 V

■ 400kHz I²C bus

■ 100 year data retention

■ 8-pin DIP, SOIC, TSSOP, MSOP or TDFN

(3 x 3 mm foot-print) packages

— TDFN max height is 0.8mm

■ 3.0V to 5.5V operation

■ Industrial and extended temperature ranges

■ Low power CMOS technology

■ 16-Byte page write buffer

DESCRIPTION

The CAT1021, CAT1022 and CAT1023 are complete The power supply monitor and reset circuit protect memory

memory and supervisory solutions for microcontroller- and system controllers during power up/down and against

based systems. A 2k-bit serial EEPROM memory and a brownout conditions. Five reset threshold voltages support

system power supervisor with brown-out protection are 5V, 3.3V and 3V systems. If power supply voltages are out

integrated together in low power CMOS technology. of tolerance reset signals become active, preventing the

Memory interface is via a 400kHz I²C bus.

systemmicrocontroller, ASICorperipheralsfromoperating.

Reset signals become inactive typically 200 ms after the

supply voltage exceeds the reset threshold level. With both

activehighandlowresetsignals,interfacetomicrocontrollers

and other ICs is simple. In addition, the RESET pin or a

separate input, MR, can be used as an input for push-button

manual reset capability.

The CAT1021 and CAT1023 provide a precision V_CC

sense circuit and two open drain outputs: one (RESET)

drives high and the other (RESET) drives low whenever

V_CCfallsbelowtheresetthresholdvoltage.TheCAT1022

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 The on-chip, 2k-bit EEPROM memory features a 16-byte

connected to a logic high.

page. In addition, hardware data protection is provided by a

V_CCsense circuit that prevents writes to memory whenever

V_CCfalls below the reset threshold or until V_CCreaches the

reset threshold during power up.

Allsupervisorshavea1.6secondwatchdogtimercircuit

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 timer monitors Available packages include an 8-pin DIP, 8-pin SOIC, 8-pin

theSDAsignal.TheCAT1023hasaseparatewatchdog TSSOP, 8-pin TDFN and 8-pin MSOP. The TDFN package

timer interrupt input pin, WDI.

thickness is 0.8mm maximum. TDFN footprint options are

3x3mm.

Doc No. 3009, Rev. K

Characteristics subject to change without notice

12 3 4 5 6 7...20

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