Datasheet Details
| Part number | DS1642 |
|---|---|
| Manufacturer | Maxim Integrated (now Analog Devices) |
| File Size | 139.26 KB |
| Description | Nonvolatile Timekeeping RAM |
| Datasheet |
 DS1642 Datasheet
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General 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-Enab
Key Features
- 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.