
DS1647/DS1647P
2 of 12
PIN DESCRIPTION
PIN
NAME
FUNCTION
PDIP
PowerCap
1
34
A18
Address Input
2
3
A16
3
32
A14
4
30
A12
5
25
A7
6
24
A6
7
23
A5
8
22
A4
9
21
A3
10
20
A2
11
19
A1
12
18
A0
23
28
A10
25
29
A11
26
27
A9
27
26
A8
28
31
A13
30
33
A17
31
2
A15
13
16
DQ0
Data Input/Output
14
15
DQ1
15
14
DQ2
17
13
DQ3
Data Input/Output
18
12
DQ4
19
11
DQ5
20
10
DQ6
21
9
DQ7
16
17
GND
Ground
22
8
CE
Active-Low Chip Enable
24
7
OE
Active-Low Output Enable
29
6
WE
Active-Low Write Enable
32
5
VCC
Power-Supply Input
—
4
PFO
Active-Low Power-Fail Output, Open Drain. This pin requires a
pullup resistor for proper operation.
—
1
N.C.
No Connection
—
X1, X2,
VBAT
Crystal Connections and Battery Connection