DS1643-70 Maxim Integrated Products, DS1643-70 Datasheet - Page 2

• Manufacturer Part Number: DS1643-70
• Description: IC RAM TIMEKEEP NV 70NS 28-EDIP
• Manufacturer: Maxim Integrated Products
• Type: Clock/Calendar/NVSRAMr

Specifications of DS1643-70

• Memory Size: 64K (8K x 8)
• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP Module (600 mil), 28-EDIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PIN DESCRIPTION
PDIP
10
21
23
24
25
11
12
13
15
16
17
18
19
20
22
26
27
28
—
14
—
1
2
3
4
5
6
7
8
9
PIN
PowerCap
1, 2, 3,
31–34
30
25
24
23
22
21
20
19
18
28
29
27
26
16
15
14
13
12
11
10
—
17
9
8
7
6
5
4
X1, X2,
NAME
GND
V
N.C.
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
CE2
PFO
A12
A10
A11
V
WE
OE
A7
A6
A5
A4
A3
A2
A1
A0
A9
A8
CE
BAT
CC
No Connection
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
2 of 17
FUNCTION
DS1643/DS1643P