| Density | 64K |
| Interface Type | SPI |
| Organization | 8192 x 8 |
| Vcc (V) | 1.8 |
| Pb-Free Packages |
PDIP 8 UDFN 8 SOIC 8 TSSOP 8 dBGA2 8 ULLGA 8 |
64Kbit, SPI Bus Serial EEPROM, High speed, supports Mode 0 and 3.
The AT25320B/640B provides 32768/65536 bits of serial electrically-erasable programmable read-only memory (EEPROM) organized as 4096/8192 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The AT25320B/640B is available in space-saving 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead Ultra Thin Mini- MAP (MLP 2x3), 8-lead Ultra Lead Frame Land Grid Array (ULA) and 8-lead TSSOP packages.
The AT25320B/640B is enabled through the Chip Select pin (CS) and accessed via a three-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK). All programming cycles are completely self-timed, and no separate erase cycle is required before write.
| Ordering Code | Package | Voltage | Operation Range |
| AT25640B-PU | 8P3 | 1.8 | Lead-free/Halogen-free/ Industrial Temperature (-40 to 85°C) |
| AT25640BN-SH-B | 8S1 | 1.8 | |
| AT25640BN-SH-T | 8S1 | 1.8 | |
| AT25640B-TH-B | 8A2 | 1.8 | |
| AT25640B-TH-T | 8A2 | 1.8 | |
| AT25640BY6-YH-T | 8Y6 | 1.8 | |
| AT25640BD3-DH-T | 8D3 | 1.8 | |
| AT25640BU2-UU-T | 8U2-1 | 1.8 |