HIGH-SPEED 4K x 8 DUAL-PORT STATIC RAM - Integrated Device Technology
Description
Integrated Device Technology, Inc.
HIGH-SPEED 4K x 8 DUAL-PORT STATIC RAM WITH SEMAPHORE
IDT71342SA/LA
FEATURES:
• High-speed access — Commercial: 20/25/35/45/55/70ns (max.
)
• Low-power operation — IDT71342SA Active: 500mW (typ.
) Standby: 5mW (typ.
) — IDT71342LA Active: 500mW (typ.
) Standby: 1mW (typ.
)
• Fully asynchronous operation from either port • Full on-chip hardware support of semaphore signalling
between ports • Battery backup operation—2V data retention • TTL-compatible; single 5V (±10%) power supply • Available in plastic packages • Industrial temperature range (–40°C to +85°C) is avail-
able, tested to military electrical specifications
DESCRIPTION:
The IDT71342 is an extremely high-speed 4K x 8 Dual-Port Static RAM with full on-chip hardware support of semaphore signalling between the two ports.
The IDT71342 provides two independent ports with separate control, address, and I/O pins that permit independent, asynchronous access for reads or writes to any location in memory.
To assist in arbitrating between ports, a fully independent semaphore logic block is provided.
This block contains unassigned flags which can be accessed by either side; however, only one side can control the flag at any time.
An automatic power down feature, controlled by CE and SEM,
permits the on-chip circuitry of each port to enter a very low
standby power mode (both CE and SEM High).
Fabricated using IDT’s CMOS high-performance technology, this device typically operates on only 500mW of power.
Low-power (LA) versions offer battery backup data retention capability, with each port typically consuming 200µW from a 2V battery.
The device is packaged in either a 64-pin TQFP, thin quad plastic flatpack, or a 52-pin PLCC.
FUNCTIONAL BLOCK DIAGRAM
R/ WL CEL
R/ WR CER
OEL
I/O0L- I/O7L
COLUMN I/O
COLUMN I/O
OER
I/O0R - I/O7R
MEMORY ARRAY
SEML
A0L- A11L
SEMAPHORE LOGIC
LEFT SIDE ADDRESS DECODE
LOGIC
RIGHT SIDE ADDRESS DECODE
LOGIC
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