FM93C56 2048-Bit Serial CMOS EEPROM (MICROWIRETM Synchronous Bus) is a 2048-bit CMOS non-volatile EEPROM organized as 128 x 16-bit array. This device features MICROWIRE interface which is a 4-wire serial bus with chipselect (CS), clock (SK), data input (DI) and data output (DO) signals. This interface is compat- ible to many of standard Microcontrollers and Microprocessors. There are 7 instructions implemented on the FM93C56 for various Read, Write, Erase, and Write Enable/Disable operations. This device is fabricated using Fairchild Semiconductor floating-gate CMOS process for high reliability, high endurance and low power consumption. “LZ” and “L” versions of FM93C56 offer very low standby current making them suitable for low power applications. This device is offered in both SO and TSSOP packages for small space consid- erations.
The FM93C56 is a 2048‑bit CMOS non‑volatile EEPROM organized as a 128 × 16‑bit array. It uses a Microwire 4‑wire serial bus (CS, SK, DI, DO) compatible with many microcontrollers and is offered in 8‑pin SO, DIP and TSSOP packages for space‑constrained designs.
Key features include a wide supply voltage range (2.7 V‑5.5 V or 4.5 V‑5.5 V), ultra‑low standby current (down to 10 pA for the LZ version), typical active current of 200 µA, 40‑year data retention, 1 M write cycles endurance, and operation from –40 °C to +125 °C. The device does not require an erase step before writing and provides self‑timed write cycles.
| Memory size | 2048 bits (128 × 16 bits) |
|---|---|
| Interface | Microwire 4‑wire serial (CS, SK, DI, DO) |
| Standby current (LZ version) | 10 pA typical |
| Standby current (L version) | 1 µA typical |
| Active current | 200 µA typical |
| Data retention | 40 years |
| Endurance | 1,000,000 write cycles |
| Package options | 8‑pin SO, 8‑pin DIP, 8‑pin TSSOP |
| Operating temperature range | -40 °C to +125 °C |
| Maximum SK clock frequency | 1 MHz |
It uses the Microwire 4‑wire serial interface (CS, SK, DI, DO).
The LZ version has a typical standby current of 10 pA.
It is rated for 1,000,000 data changes (write cycles).
The device is offered in 8‑pin SO, 8‑pin DIP, and 8‑pin TSSOP packages.