Datasheet Details
| Part number | DS1644 |
|---|---|
| Manufacturer | Maxim Integrated (now Analog Devices) |
| File Size | 209.95 KB |
| Description | Nonvolatile Timekeeping RAM |
| Datasheet |
 DS1644 Datasheet
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General Description
PIN PDIP PowerCap
NAME
1 32
A14
2 30
A12
3 25
A7
4 24
A6
5 23
A5
6 22
A4
7 21
A3
8 20
A2
9 19
A1
10 18
A0
11 16
DQ0
12 15
DQ1
13 14
DQ2
14 17
GND
15 13
DQ3
16 12
DQ4
17 11
DQ5
18 10
DQ6
19 9
DQ7
20 8
CE
21 28
A10
22 7
OE
23 29
A11
24 27
A9
25 26
A8
Key Features
- Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit and Lithium Energy Source.
- 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.
- BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Leap Year Compensation Valid Up to 2100.
- Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolera.
