Datasheet

DS1643/DS1643P
2 of 17
PIN DESCRIPTION
PIN
PDIP PowerCap
NAME FUNCTION
1
1, 2, 3,
31–34
N.C. No Connection
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
21 28 A10
23 29 A11
24 27 A9
25 26 A8
Address Inputs
11 16 DQ0
12 15 DQ1
13 14 DQ2
15 13 DQ3
16 12 DQ4
17 11 DQ5
18 10 DQ6
19 9 DQ7
Data Input/Output
20 8
CE
Active-Low Chip-Enable Input
22 7
OE
Active-Low Output-Enable Input
26 — CE2 Chip-Enable 2 Input (Active High)
27 6
WE
Active-Low Write-Enable Input
28 5 V
CC
Power-Supply Input
— 4
PFO
Active-Low Power-Fail Output. This open-drain pin requires a
pullup resistor for proper operation.
14 17 GND Ground
—
X1, X2,
V
BAT
Crystal Connection, Battery Connection