ATMEL AT93C46, AT93C56, AT93C66 3-wire Serial EEPROMs User Manual and Specifications
Summary
The AT93C series provides high-reliability, serial EEPROMs for demanding industrial and commercial applications requiring low voltage and low power operation. Offering scalable capacities and robust endurance, this non-volatile memory supports voltages down to 1.8V. This guide details comprehensive technical specifications, pin configurations, and operating parameters, helping engineers successfully integrate the device into advanced electronic systems.
Page 1 Text Content
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Features Low-voltage and Standard-voltage Operation 5.0 (VCC = 4.5V to 5.5V) 2.7 (VCC = 2.7V to 5.5V) 2.5 (VCC = 2.5V to 5.5V) 1.8 (VCC = 1.8V to 5.5V) User-selectable Internal Organization 1K: 128 x 8 or 64 x 16 2K: 256 x 8 or 128 x 16 4K: 512 x 8 or 256 x 16 3-wire Serial Interface 3-wire Serial 2 MHz Clock Rate (5V) Self-timed Write Cycle (10 ms max)
EEPROMs
High Reliability Endurance: 1 Million Write Cycles
1K (128 x 8 or 64 x 16)
Data Retention: 100 Years Automotive Grade and Extended Temperature Devices Available
8-lead PDIP, 8-lead JEDEC and EIAJ SOIC, and 8-lead TSSOP Packages 2K (256 x 8 or 128 x 16)
4K (512 x 8 or 256 x 16)
Description The AT93C46/56/66 provides 1024/2048/4096 bits of serial electrically erasable pro- grammable read only memory (EEPROM) organized as 64/128/256 words of 16 bits
AT93C46
each, when the ORG pin is connected to VCC and 128/256/512 words of 8 bits each when it is tied to ground. The device is optimized for use in many industrial and com-
AT93C56
mercial applications where low power and low voltage operations are essential. The AT93C46/56/66 is available in space-saving 8-lead PDIP and 8-lead JEDEC and EIAJ
AT93C66 SOIC packages. (continued)
Pin Configurations
8-lead PDIP
Pin Name Function CS Chip Select
CS VCC
SK Serial Data Clock SK DC
DI ORG
DI Serial Data Input
DO GND
DO Serial Data Output GND Ground VCC Power Supply 8-lead SOIC ORG Internal Organization
CS VCC
DC Don’t Connect
SK DC DI ORG DO GND
8-lead SOIC Rotated (R) (1K JEDEC Only)
8-lead TSSOP
DC ORG
CS VCC
VCC GND
SK DC
CS DO
DI ORG
SK DI
DO GND
Rev. 0172O–08/01
Page Summary Contents For ATMEL AT93C46, AT93C56, AT93C66 3-wire Serial EEPROMs User Manual and Specifications
Manual Details
| Brand | Atmel |
|---|---|
| Pages | 15 |
| File Size | 138.13 KB |
| Published | May 15, 2026 |
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Frequently Asked Questions
How is this device accessed and read?
It is enabled via the Chip Select pin (CS) and accessed using a 3-wire serial interface consisting of Data Input (DI), Data Output (DO), and Shift Clock (SK).
Do I need to perform an erase cycle before writing data?
No, the WRITE cycle is completely self-timed, meaning no separate ERASE cycle is required before performing a write operation.
What voltage levels can this EEPROM operate at?
The AT93C46 supports various versions including 5.0V (4.5V to 5.5V), 2.7V, 2.5V, and 1.8V down to 5.5V.
How do I select the internal data organization (x8 vs x16)?
Connecting the ORG pin to VCC selects the x16 organization, while connecting it to ground selects the x8 organization.