CAT1321: CPU Supervisor with 32 k Serial EEPROM Memory
The CAT1321 is a complete memory and supervisory solution for microcontroller-based systems. A 32 kbit 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 400 kHz I²C bus.The CAT1321 provides a precision VCC sense circuit that drives an open drain output, RESET high whenever VCC falls below the reset threshold voltage.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 options, interface to microcontrollers and other ICs is simple.The CAT1321 memory features a 64-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, SOIC, TSSOP and 4.9 x 3 mm TDFN.
Features- Precision power supply voltage monitor - 5.0 V, 3.3 V and 3.0 V systems - +5.0V (+/- 5%, +/- 10%) - +3.3V (+/- 5%, +/- 10%) - +3.0V (+/- 10%)
- Active high reset
- Valid reset guaranteed at VCC=1V
- 400 kHz I²C bus
- 3.0 V to 5.5 V operation
- Low power CMOS technology
- 64-Byte page write buffer
- 1,000,000 Program/Erase cycles
- 100 year data retention
- 8-pin DIP, SOIC, TSSOP and TDFN packages
- Industrial temperature range
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Applications- Industrial control
- Medical systems
- Printers
- Mass storage
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Data Sheets (1)
Package Drawings (1)
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| CAT1321LI-25-G | Active | Pb-free
Halide free | PDIP-8 | 646AA | NA | Tube | 50 | $0.884 |
| CAT1321LI-28-G | Active | Pb-free
Halide free | PDIP-8 | 646AA | NA | Tube | 50 | $0.884 |
| CAT1321LI-30-G | Active | Pb-free
Halide free | PDIP-8 | 646AA | NA | Tube | 50 | $0.884 |
| CAT1321LI-42-G | Active | Pb-free
Halide free | PDIP-8 | 646AA | NA | Tube | 50 | $0.884 |
| CAT1321LI-45-G | Active | Pb-free
Halide free | PDIP-8 | 646AA | NA | Tube | 50 | $0.884 |
Specifications
| Product | 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) |
|---|
| CAT1321LI-25-G | Serial | 32 kb | 4k x 8 | I2C | 400 | - | 3 | 5.5 | 40 | 3 | -40 | 85 |
| CAT1321LI-28-G | Serial | 32 kb | 4k x 8 | I2C | 400 | - | 3 | 5.5 | 40 | 3 | -40 | 85 |
| CAT1321LI-30-G | Serial | 32 kb | 4k x 8 | I2C | 400 | - | 3 | 5.5 | 40 | 3 | -40 | 85 |
| CAT1321LI-42-G | Serial | 32 kb | 4k x 8 | I2C | 400 | - | 3 | 5.5 | 40 | 3 | -40 | 85 |
| CAT1321LI-45-G | Serial | 32 kb | 4k x 8 | I2C | 400 | - | 3 | 5.5 | 40 | 3 | -40 | 85 |
