m48t128y STMicroelectronics, m48t128y Datasheet - Page 4

• Manufacturer Part Number: m48t128y
• Description: 5.0 Or 3.3v, 1 Mbit 128 Kb X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

M48T128Y, M48T128V*
SUMMARY DESCRIPTION
The M48T128Y/V TIMEKEEPER
128Kb x 8 non-volatile static RAM and real time
clock. The special DIP package provides a fully in-
tegrated battery back-up memory and real time
clock solution. The M48T128Y/V directly replaces
industry standard 128Kb x 8 SRAM.
Figure 2. Logic Diagram
Figure 3. DIP Connections
4/22
A0-A16
W
G
E
DQ0
DQ1
DQ2
V SS
A16
A14
A12
NC
A7
A6
A5
A4
A3
A2
A1
A0
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
M48T128Y
M48T128V
M48T128Y
M48T128V
V CC
V SS
AI02245
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
8
V CC
A15
NC
W
A13
A8
A9
A11
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
®
RAM is a
DQ0-DQ7
AI02244
It also provides the non-volatility of Flash without
any requirement for special WRITE timing or limi-
tations on the number of WRITEs that can be per-
formed. The 32-pin, 600mil DIP Hybrid houses a
controller chip, SRAM, quartz crystal, and a long
life lithium button cell in a single package.
Table 1. Signal Names
A0-A16
DQ0-DQ7
E
G
W
V
V
NC
CC
SS
Address Inputs
Data Inputs / Outputs
Chip Enable
Output Enable
WRITE Enable
Supply Voltage
Ground
Not Connected Internally