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CAT1321 Dataheets PDF



Part Number CAT1321
Manufacturers Catalyst Semiconductor
Logo Catalyst Semiconductor
Description (CAT1320 / CAT1321) Supervisory Circuits
Datasheet CAT1321 DatasheetCAT1321 Datasheet (PDF)

www.DataSheet4U.com CAT1320, CAT1321 Supervisory Circuits with I2C Serial 32K CMOS EEPROM FEATURES I Precision power supply voltage monitor I 3.0V to 5.5V operation I Low power CMOS technology I 64-Byte page write buffer I 1,000,000 Program/Erase cycles I 100 year data retention H GEN FR ALO EE LE A D F R E ETM — 5V, 3.3V and 3V systems - +5.0V (+/- 5%, +/- 10%) - +3.3V (+/- 5%, +/- 10%) - +3.0V (+/- 10%) I Active low reset, CAT1320 I Active high reset, CAT1321 I Valid reset guaranteed at.

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www.DataSheet4U.com CAT1320, CAT1321 Supervisory Circuits with I2C Serial 32K CMOS EEPROM FEATURES I Precision power supply voltage monitor I 3.0V to 5.5V operation I Low power CMOS technology I 64-Byte page write buffer I 1,000,000 Program/Erase cycles I 100 year data retention H GEN FR ALO EE LE A D F R E ETM — 5V, 3.3V and 3V systems - +5.0V (+/- 5%, +/- 10%) - +3.3V (+/- 5%, +/- 10%) - +3.0V (+/- 10%) I Active low reset, CAT1320 I Active high reset, CAT1321 I Valid reset guaranteed at VCC=1V I 400kHz I2C bus I 8-pin DIP, SOIC, TSSOP and TDFN packages I Industrial temperature range DESCRIPTION The CAT1320 and CAT1321 are complete memory and supervisory solutions for microcontroller-based systems. A 32kbit serial EEPROM memory and a system power supervisor with brown-out protection are integrated together in low power CMOS technology. Memory interface is via a 400kHz I2C bus. 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 options, interface to microcontrollers and other ICs is simple. In addition, the RESET (CAT1320) pin can be used as an input for push-button manual reset capability. The CAT1320 provides a precision VCC sense circuit and drives an open drain output, RESET low whenever The CAT1320/21 memory features a 64-byte page. In addition, hardware data protection is provided by a VCC VCC falls below the reset threshold voltage. sense circuit that prevents writes to memory whenever VCC The CAT1321 provides a precision VCC sense circuit falls below the reset threshold or until VCC reaches the reset that drives an open drain output, RESET high whenever threshold during power up. VCC falls below the reset threshold voltage. Available packages include an 8-pin DIP, SOIC, TSSOP The power supply monitor and reset circuit protect and 4.9 x 3mm TDFN. memory and system controllers during power up/down and against brownout conditions. Five reset threshold voltages support 5V, 3.3V and 3V systems. If power supply voltages are out of tolerance reset signals become PIN CONFIGURATION PDIP (P, L) SOIC (J, W) A0 1 A1 2 A2 3 VSS 4 A0 1 A1 2 A2 3 VSS 4 CAT1321 TSSOP (U, Y) A0 1 A1 2 A2 3 VSS 4 CAT1320 8 VCC 7 RESET 6 SCL 5 SDA TDFN PACKAGE: 4.9MM X 3MM (RD2, ZD2) A0 A1 A2 VSS 1 2 3 4 8 7 CAT1320 8 VCC 7 RESET 6 SCL 5 SDA VCC RESET SCL SDA CAT1320 6 5 8 VCC 7 RESET 6 SCL 5 SDA A0 1 A1 2 A2 3 VSS 4 CAT1321 8 VCC 7 RESET 6 SCL 5 SDA A0 A1 A2 VSS 1 2 3 4 8 7 VCC RESET SCL SDA CAT1321 6 5 © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 20585, Rev. 00 CAT1320, CAT1321 Advance Information BLOCK DIAGRAM — CAT1320, CAT1321 EXTERNAL LOAD DOUT ACK VCC VSS WORD ADDRESS BUFFERS COLUMN DECODERS SENSE AMPS SHIFT REGISTERS Threshold Voltage Options Part Dash Minimum Number Threshold -45 -42 -30 -28 -25 4.50 4.25 3.0.



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