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IDT71342LA45PF Datasheet

  • IDT71342LA45PF

  • HIGH-SPEED 4K x 8 DUAL-PORT STATIC RAM WITH SEMAPHORE

  • 147.18KB

  • 13頁(yè)

  • IDT

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HIGH-SPEED
4K x 8 DUAL-PORT
STATIC RAM WITH SEMAPHORE
Integrated Device Technology, Inc.
IDT71342SA/LA
FEATURES:
鈥?High-speed access
鈥?Commercial: 20/25/35/45/55/70ns (max.)
鈥?Low-power operation
鈥?IDT71342SA
Active: 500mW (typ.)
Standby: 5mW (typ.)
鈥?IDT71342LA
Active: 500mW (typ.)
Standby: 1mW (typ.)
鈥?Fully asynchronous operation from either port
鈥?Full on-chip hardware support of semaphore signalling
between ports
鈥?Battery backup operation鈥?V data retention
鈥?TTL-compatible; single 5V (鹵10%) power supply
鈥?Available in plastic packages
鈥?Industrial temperature range (鈥?0擄C to +85擄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鈥檚 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 200碌W
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/
W
L
CE
L
CE
R
R/
W
R
OE
L
I/O
0L
- I/O
7L
COLUMN
I/O
COLUMN
I/O
OE
R
I/O
0R
- I/O
7R
MEMORY
ARRAY
SEMAPHORE
LOGIC
SEM
L
A
0L
- A
11L
LEFT SIDE
ADDRESS
DECODE
LOGIC
RIGHT SIDE
ADDRESS
DECODE
LOGIC
SEM
R
A
0R
- A
11R
2721 drw 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
漏1996 Integrated Device Technology, Inc.
For latest information contact IDT鈥檚 web site at www.idt.com or fax-on-demand at 408-492-8391.
OCTOBER 1996
DSC-2721/4
6.05
1

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