m48t512y STMicroelectronics, m48t512y Datasheet - Page 4

• Manufacturer Part Number: m48t512y
• Description: 5.0 Or 3.3v, 4 Mbit 512 Kbit X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

M48T512Y, M48T512V*
SUMMARY DESCRIPTION
The M48T512Y/V TIMEKEEPER
512Kb x 8 non-volatile static RAM and real time
clock organized as 524,288 words by 8 bits. The
special DIP package provides a fully integrated
battery back-up memory and real time clock solu-
tion.
Figure 2. Logic Diagram
Figure 3. 32-pin DIP Connections
4/21
A0-A18
W
G
E
19
M48T512Y
M48T512V
V CC
V SS
8
®
RAM is a
DQ0-DQ7
DQ0
DQ1
DQ2
V SS
A18
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
AI02262
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
M48T512Y
M48T512V
The M48T512Y/V directly replaces industry stan-
dard 512Kb x 8 SRAMs. It also provides the non-
volatility of Flash without any requirement for spe-
cial WRITE timing or limitations on the number of
WRITEs that can be performed.
Table 1. Signal Names
AI02263
A0-A18
DQ0-DQ7
E
G
W
V
V
CC
SS
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V CC
A15
A17
W
A13
A8
A9
A11
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
Address Inputs
Data Inputs / Outputs
Chip Enable Input
Output Enable Input
WRITE Enable Input
Supply Voltage
Ground