EEPROM Serial 2-Kb I2C CPU Supervisor

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Overview

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

  • Industrial control
  • Medical systems
  • Printers
  • Mass storage
  • 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

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CAD Models

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ON Target

Type

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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)

Reference Price

CAT1021WI-25-GT3

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021WI-28-GT3

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Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021WI-30-GT3

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Last Shipments

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021WI-42-GT3

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021WI-45-GT3

Loading...

Obsolete

CAD Model

Pb

A

H

P

SOIC-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021YI-25-GT3

Loading...

Obsolete

CAD Model

Pb

A

H

P

TSSOP-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021YI-28-GT3

Loading...

Obsolete

CAD Model

Pb

A

H

P

TSSOP-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021YI-30-GT3

Loading...

Obsolete

CAD Model

Pb

A

H

P

TSSOP-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021YI-42-GT3

Loading...

Obsolete

CAD Model

Pb

A

H

P

TSSOP-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021YI-45-GT3

Loading...

Obsolete

CAD Model

Pb

A

H

P

TSSOP-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

CAT1021ZI-42-GT3

Loading...

Obsolete

CAD Model

Pb

A

H

P

MSOP-8

1

260

REEL

3000

N

Serial

2 kb

256 x 8

I2C

400

900

2.7

5.5

60

3

-40

85

Price N/A

More Details

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