HIGH-SPEED
8K x 16 DUAL-PORT
STATIC RAM
Features
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True Dual-Ported memory cells which allow simultaneous
reads of the same memory location
High-speed access
– Military: 20/25/35/55/70ns (max.)
– Industrial: 55ns (max.)
– Commercial: 15/17/20/25/35/55ns (max.)
Low-power operation
– IDT7025S
Active: 750mW (typ.)
Standby: 5mW (typ.)
– IDT7025L
Active: 750mW (typ.)
Standby: 1mW (typ.)
Separate upper-byte and lower-byte control for multiplexed
bus compatibility
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IDT7025S/L
IDT7025 easily expands data bus width to 32 bits or more
using the Master/Slave select when cascading more than
one device
M/S = H for BUSY output flag on Master
M/S = L for BUSY input on Slave
Interrupt Flag
On-chip port arbitration logic
Full on-chip hardware support of semaphore signaling
between ports
Fully asynchronous operation from either port
Battery backup operation—2V data retention
TTL-compatible, single 5V (±10%) power supply
Available in 84-pin PGA, Flatpack, PLCC, and 100-pin Thin
Quad Flatpack
Industrial temperature range (–40°C to +85°C) is available
for selected speeds
Functional Block Diagram
R/WL
UBL
R/WR
UBR
LBL
CEL
OEL
LBR
CER
OER
I/O8L-I/O15L
I/O8R-I/O15R
I/O
Control
I/O0L-I/O7L
BUSYL
I/O
Control
I/O0R-I/O7R
(1,2)
A12L
A0L
(1,2)
BUSYR
Address
Decoder
MEMORY
ARRAY
13
CEL
OEL
R/WL
SEML
(2)
INTL
Address
Decoder
A12R
A0R
13
ARBITRATION
INTERRUPT
SEMAPHORE
LOGIC
M/S
CER
OER
R/WR
SEMR
INTR(2)
2683 drw 01
NOTES:
1. (MASTER): BUSY is output; (SLAVE): BUSY is input.
2. BUSY outputs and INT outputs are non-tri-stated push-pull.
NOVEMBER 2001
1
©2001 Integrated Device Technology, Inc.
DSC 2683/9
