DS1643/DS1643P
PIN DESCRIPTION
PIN
PDIP
PowerCap
1, 2, 3,
1
31–34
2
30
3
25
4
24
5
23
6
22
7
21
8
20
9
19
10
18
21
28
23
29
24
27
25
26
11
16
12
15
13
14
15
13
16
12
17
11
18
10
19
9
20
8
22
7
26
—
27
6
28
5
—
14
—
4
17
NAME
N.C.
A12
A7
A6
A5
A4
A3
A2
A1
A0
A10
A11
A9
A8
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
CE
OE
CE2
WE
V
CC
PFO
GND
X1, X2,
V
BAT
No Connection
FUNCTION
Address Inputs
Data Input/Output
Active-Low Chip-Enable Input
Active-Low Output-Enable Input
Chip-Enable 2 Input (Active High)
Active-Low Write-Enable Input
Power-Supply Input
Active-Low Power-Fail Output. This open-drain pin requires a
pullup resistor for proper operation.
Ground
Crystal Connection, Battery Connection
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