HIGH SPEED 2K x 8 DUAL-PORT STATIC RAM - IDT
Description
HIGH SPEED 2K X 8 DUAL-PORT STATIC RAM WITH INTERRUPTS
71321SA/LA 71421SA/LA
Features
◆ High-speed access – Commercial: 20/35/55ns (max.
) – Industrial: 25/55ns (max.
)
◆ Low-power operation – IDT71321/IDT71421SA — Active: 325mW (typ.
) — Standby: 5mW (typ.
) – IDT71321/421LA — Active: 325mW (typ.
) — Standby: 1mW (typ.
)
◆ Two INT flags for port-to-port communications
◆ MASTER IDT71321 easily expands data bus width to 16-ormore-bits using SLAVE IDT71421
◆ On-chip port arbitration logic (IDT71321 only) ◆ BUSY output flag on IDT71321; BUSY input on IDT71421 ◆ Fully asynchronous operation from either port ◆ Battery backup operation – 2V data retention (LA only) ◆ TTL-compatible, single 5V ±10% power supply ◆ Available in 52-Pin PLCC, 52-Pin STQFP, 64-Pin TQFP, and
64-Pin STQFP ◆ Industrial temperature range (–40°C to +85°C) is available
for selected speeds ◆ Green parts available, see ordering information
Functional Block Diagram
OEL
CEL R/WL
OER
CER R/WR
I/O0L- I/O7L
BUSYL(1,2) A10L A0L
I/O Control
I/O Control
Address Decoder
11
CEL OEL R/WL
MEMORY ARRAY
ARBITRATION and
INTERRUPT LOGIC
Address Decoder
11
CER OER R/WR
I/O0R-I/O7R
BUSYR(1,2) A10R A0R
INTL(2)
NOTES: 1.
IDT71321(MASTER): BUSYisopendrainoutputandrequirespullupresistorof270Ω.
IDT71421 (SLAVE): BUSY is input.
2.
Open drain output: requires pullup resistor of 270Ω.
©2019 Integrated Device Technology, Inc.
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INTR(2)
2691 drw 01
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71321SA/LA and 71421SA/LA High Speed 2K x 8 Dual-Port Static RAM with Interrupts
Description
The IDT71321/IDT71421 are high-speed 2K x 8 Dual-Port Static RAMs with internal interrupt logic for interprocessor communications.
The IDT71321 is designed to be used as a stand-alone 8-bit DualPort Static RAM or as a "MASTER" Dual-Port Static RAM together with the IDT71421 "SLAVE" Dual-Port in 16-bit-or-more word width systems.
Using the IDT MASTER/SLAVE Dual-Port Static RAM approach in 16-or-more-bit memory system applications results in full speed, er...
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