CAT1021: EEPROM Serial 2-Kb I2C CPU Supervisor

Datasheet: CAT1021, CAT1022, CAT1023 - Supervisory Circuits with EEPROM Serial 2k-bit I2C Manual Reset and Watchdog Timer
Rev. 19 (163kB)
Product Overview
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Product Change Notification
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 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 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, the RESET pin 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 VCC sense circuit that prevents writes to memory whenever VCC falls below the reset threshold or until VCC reaches 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
Features
 
  • Precision power supply voltage monitor
    - 5.0 V, 3.3 V and 3.0 V systems
    - Five threshold voltage options
  • Watchdog timer
  • Active high or low reset
    - Valid reset guaranteed at VCC = 1 V
  • 400 kHz I²C bus
  • 3.0 V to 5.5 V operation
  • Low power CMOS technology
  • 16-Byte page write buffer
  • Built-in inadvertent write protection
    — WP pin
  • 1,000,000 Program/Erase cycles
  • Manual reset input
  • 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
  • Industrial and extended temperature ranges
Applications
  • Industrial control
  • Medical systems
  • Printers
  • Mass storage
Technical Documentation & Design Resources
Data Sheets (1) Package Drawings (3)
Availability & Samples
Specifications
Interactive Block Diagram
Product
Status
Compliance
Description
Package
MSL
Container
Budgetary Price/Unit
Type
Case Outline
Type
Temperature
Type
Qty.
CAT1021WI-25-GT3 Lifetime
Pb-free
Halide free
CAT1021 SOIC-8 751BD 1 260 Tape and Reel 3000 $0.9493
CAT1021WI-28-GT3 Lifetime
Pb-free
Halide free
CAT1021 SOIC-8 751BD 1 260 Tape and Reel 3000 $0.78
CAT1021WI-30-GT3 Active
Pb-free
Halide free
CAT1021 SOIC-8 751BD 1 260 Tape and Reel 3000 $0.6227
CAT1021WI-42-GT3 Lifetime
Pb-free
Halide free
CAT1021 SOIC-8 751BD 1 260 Tape and Reel 3000 $0.9626
CAT1021WI-45-GT3 Lifetime
Pb-free
Halide free
CAT1021 SOIC-8 751BD 1 260 Tape and Reel 3000 $1.172
CAT1021YI-25-GT3 Lifetime
Pb-free
Halide free
CAT1021 TSSOP-8 948AL 1 260 Tape and Reel 3000 $0.9013
CAT1021YI-28-GT3 Lifetime
Pb-free
Halide free
CAT1021 TSSOP-8 948AL 1 260 Tape and Reel 3000 $0.9013
CAT1021YI-30-GT3 Lifetime
Pb-free
Halide free
CAT1021 TSSOP-8 948AL 1 260 Tape and Reel 3000 $0.9013
CAT1021YI-42-GT3 Lifetime
Pb-free
Halide free
CAT1021 TSSOP-8 948AL 1 260 Tape and Reel 3000 $0.9013
CAT1021YI-45-GT3 Lifetime
Pb-free
Halide free
CAT1021 TSSOP-8 948AL 1 260 Tape and Reel 3000 $0.9026
CAT1021ZI-42-GT3 Lifetime
Pb-free
Halide free
CAT1021 MSOP-8 846AD 1 260 Tape and Reel 3000 $0.9066
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
PandS   (2020-09-14 00:00) : >1K
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 3,000
Market Leadtime (weeks) : Contact Factory
ON Semiconductor   (2020-09-02 00:00) : 9,000
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory
Market Leadtime (weeks) : Contact Factory

Product
Description
Pricing ($/Unit)
Compliance
Status
Type
Density
Organization
Data Transmission Standard
fcycle Max (kHz)
tACC Max ns
VCC Min (V)
VCC Max (V)
Istandby Max (µA)
Iact Max (mA)
T Min (°C)
T Max (°C)
Package Type
CAT1021WI-30-GT3  
 $0.6227 
Pb
H
 Active   
Serial
2 kb
256 x 8
I2C
400
900
2.7
5.5
60
3
-40
85
SOIC-8
Case Outlines
751BD    948AL    846AD   
Application
Diagram - Block
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