• High-speed (equal access and cycle times)
-Military - 45/55/70/85ns max.
-Commercial - 35/45/55/70ns max.
• Low-power operation
Active: 400mW (typ.)
Standby: 400l'W (typ.)
Active: 350mW (typ.)
Standby: 100l'W (typ.)
• Battery backup operation - 2V data retention
(L version only)
• High-density industry standard 24-pin, 300 mil DIP
• Produced with advanced CEMOS" technology
• Separate data input and output
• Single 5V (±10%) power supply
• Inputs/outputs TTL-compatible
• Three state outputs
• Static operation - no clocks or refresh required
• Military product 100% screened to MIL-STD-883, Class B
The IDT71257, a 262, 144-bit high-speed static RAM organized
as 256K x 1, is fabricated using IDT's high-performance, high-
reliability technology - CEMOS. This state-of-the-art tech-
nology, combined with innovative circuit design techniques, pro-
vides a cost effective approach for memory intensive applications.
Access times as fast as 45ns are available, with typical power
consumption of only 400mW. The IDT71257 offers a reduced
power standby mode, IS81' which enables the designer to greatly
reduce device power requirements. This capability significantly
decreases system power and cooling levels, while greatly en-
hancing system reliability. The low-power (L) version also offers
a battery backup data retention capability where the circuit
typically consumes only 80p.W when operating from a 2V battery.
All inputs and outputs are TTL-compatible and operate from a
single 5 volt supply. Fully static asynchronous circuitry, along
with matching access and cycle times, favor the simplified sys-
tem design approach.
The IDT71257 is packaged in a 24-pin, 300 mil DIP providing
excellent board-level packi ng densities.
The IDT71257 military RAM is 100% processed in compliance
to the test methods of MIL-STD-883, Method 5004, making it
ideally suited to military temperature applications demanding
the highest level of performance and reliability.
FUNCTIONAL BLOCK DIAGRAM
mC MEMORY ARRAY
CEMOS is a trademark 01 Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
.1986 Integrated Device Technology. Inc.
Printed in U.S.A.