Product Overview
The 25LC320A-I is a 32 Kbit (4 K x 8) SPI serial EEPROM from Microchip Technology, operating at 2.5 V to 5.5 V with industrial temperature range (-40 °C to +85 °C). The ‘A’ revision offers enhanced features compared to the original 25LC320, including a 32-byte page size and improved performance. This compact non-volatile memory is ideal for storing configuration parameters, sensor calibration data, and device identification information.
Organized as 4,096 bytes (4 KB), the 25LC320A features byte write and 32-byte page write capability with typical 3 ms write cycle time. The device supports SPI modes 0,0 and 1,1 at clock frequencies up to 10 MHz, providing efficient data transfer for small to medium parameter storage applications.
The device includes comprehensive write protection: hardware Write-Protect (WP) pin and software-configurable block protection (BP0, BP1) allowing protection of 1/4, 1/2, or the entire memory array. A /HOLD pin enables pausing of serial communication. With over 1 million erase/write cycles and greater than 200-year data retention, the 25LC320A offers Microchip’s proven EEPROM reliability in a small, cost-effective 8-pin package.
Key Specifications
| Parameter | Value |
|---|---|
| Memory Type | SPI Serial EEPROM |
| Density | 32 Kbit (4 Kbyte) |
| Organization | 4,096 x 8 bits |
| Interface | SPI (Modes 0,0 and 1,1) |
| Max Clock Frequency | 10 MHz |
| Operating Voltage | 2.5 V to 5.5 V |
| Page Size | 32 bytes (A revision) |
| Page Write Time | 5 ms max (typical 3 ms) |
| Read Current | 2 mA max @ 5.5 V |
| Standby Current | 5 µA max |
| Write Protect | HW WP pin + SW block protection (BP0/1) |
| HOLD Function | Yes |
| Endurance | 1,000,000 cycles |
| Data Retention | > 200 years |
| Operating Temperature | -40 °C to +85 °C (industrial) |
| Packages | 8-pin PDIP, SOIC, TSSOP, DFN |
Features
- 32 Kbit (4 K x 8) SPI serial EEPROM
- 10 MHz max clock frequency
- SPI modes 0,0 and 1,1
- 2.5 V to 5.5 V operation
- 32-byte page write
- Block protection (BP0, BP1)
- Hardware WP pin + /HOLD pin
- Sequential read
- Self-timed write cycle
- Power-on reset / brown-out
- > 1M cycles, > 200-year retention
- Industrial temperature range
- RoHS compliant
Applications
- Configuration parameter storage
- Sensor calibration and trim data
- Device serial number and ID
- Power supply settings
- Display configuration data
- Small event logging
- Consumer electronics settings
- IoT sensor nodes