Key facts
- Brand
- Atmel
- Model
- AT93C56A/66A
- Category
- EEPROM
- Industry
- Electronics
- Documents
- 2
- Languages
- EN
- Last added
- 2026-10-30
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Atmel AT93C56A/66A EEPROM Datasheet
The AT93C56A/66A is a serial EEPROM offering 2048 or 4096 bits of memory in 128/256 or 256/512 word configurations. It supports low-voltage (1.8V–5.5V) and standard-voltage (2.7V–5.5V) operation with a three-wire serial interface. The device features self-timed write cycles, 1 million write endurance, and 100-year data retention. It is available in multiple 8-lead packages including PDIP, SOIC, TSSOP, and BGA2. Programming is controlled via seven instructions including READ, ERASE, WRITE, and EWEN.
Read onlineAtmel AT93C56A/66A specifications
| Memory Size | 2048/4096 bits |
|---|---|
| Organization | 128/256 words of 16 bits each or 256/512 words of 8 bits each |
| Operating Voltage | 1.8V to 5.5V or 2.7V to 5.5V |
| Write Endurance | 1 million write cycles |
| Clock Rate | 2 MHz (at 5V) |
| Package Types | 8-lead PDIP, SOIC, TSSOP, BGA2, ULA, MLP 2x3 |
All Atmel AT93C56A/66A documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the write endurance of the AT93C56A/66A?
The device has 1 million write cycles endurance.
What voltage ranges does it support?
It supports 1.8V to 5.5V and 2.7V to 5.5V.
What temperature were the qualification tests performed at?
All qualification tests were conducted at 25 °C.
From: ATMEL AT93C56A/66A (AT3552m/2k) SPI EEPROM Product Qualification handbook
What is the maximum trigger current used in latch‑up testing?
The latch‑up tests used a maximum trigger current of 200 mA.
From: ATMEL AT93C56A/66A (AT3552m/2k) SPI EEPROM Product Qualification handbook