Datasheet Details
| Part number | DS1642 |
|---|---|
| Manufacturer | Maxim Integrated (Analog Devices) |
| File Size | 139.26 KB |
| Description | Nonvolatile Timekeeping RAM |
| Datasheet |
 DS1642 Datasheet
|
|
|
Description
PIN NAME FUNCTION 1 A7 2 A6 3 A5 4 A4 5 A3 6 A2 Address Input 7 A1 8 A0 19 A10 22 A9 23 A8 9 DQ0 10 DQ1 11 DQ2 13 14 DQ3 DQ4 Data Input/Output 15 DQ5 16 DQ6 17 DQ7 12 GND Ground 18 CE Active-Low Chip-Enable Input 20 OE Active-Low Output-Enable Input 21 WE Active-Low Write-EnabFeatures
- Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source.
- Standard JEDEC Bytewide 2k x 8 Static RAM Pinout.
- Clock Registers are Accessed Identically to the Static RAM. These Registers are Resident in the Eight Top RAM Locations.
- Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power.
- Access Times of 85ns and 100ns.
- Quartz Accuracy ±1 Minute a Month at +25°C, Factory Calibrated.
- BCD-Coded Year, Mon.