PDM41028
1 Megabit Static RAM
256K x 4-Bit
Description
Features
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The PDM41028 is a high-performance CMOS static
RAM organized as 262,144 x 4 bits. Writing to this
device is accomplished when the write enable (WE)
and the chip enable (CE) inputs are both LOW.
Reading is accomplished when WE remains HIGH
and CE and OE are both LOW.
High speed access times
Com’l: 10, 12 and 15 ns
Ind’l: 12 and 15 ns
Low power operation (typical)
- PDM41028SA
Active: 400 mW
Standby: 150 mW
- PDM41028LA
Active: 350 mW
Standby: 100 mW
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1
The PDM41028 operates from a single +5V power
supply and all the inputs and outputs are fully TTLcompatible. The PDM41028 comes in two versions,
the standard power version PDM41028SA and a low
power version the PDM41028LA. The two versions
are functionally the same and only differ in their
power consumption.
Single +5V (±10%) power supply
TTL-compatible inputs and outputs
Packages
Plastic SOJ (300 mil) - TSO
Plastic SOJ (400 mil) - SO
The PDM41028 is available in a 28-pin 300-mil SOJ,
and a 28-pin 400-mil SOJ for surface mount
applications.
I/O 0
I/O 1
3
4
5
6
7
Functional Block Diagram
Addresses
2
A0
•
•
•
•
•
A17
Decoder
•
•
•
•
•
•
Memory
8
Matrix
9
• • • • •
Input
Data
Control
Column I/O
10
I/O 2
I/O 3
11
CE
12
WE
OE
Rev. 2.2 - 4/29/98
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