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Integrated Device Technology - HIGH-SPEED 4K x 8 DUAL-PORT STATIC RAM WITH SEMAPHORE

Numéro de référence IDT71342SA
Description HIGH-SPEED 4K x 8 DUAL-PORT STATIC RAM WITH SEMAPHORE
Fabricant Integrated Device Technology 
Logo Integrated Device Technology 





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IDT71342SA fiche technique
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
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
©1996 Integrated Device Technology, Inc.
For latest information contact IDT’s web site at www.idt.com or fax-on-demand at 408-492-8391.
6.05
SEMR
A0R- A11R
2721 drw 01
OCTOBER 1996
DSC-2721/4
1

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