IDT71V546, 128K x 36, 3.3V Synchronous SRAM with
ZBT™ Feature, Burst Counter and Pipelined Outputs
Commercial and Industrial Temperature Ranges
The IDT71V546 is a 3.3V high-speed 4,718,592-bit (4.5 Megabit)
synchronous SRAM organized as 128K x 36 bits. It is designed to
eliminate dead bus cycles when turning the bus around between reads
and writes, or writes and reads. Thus it has been given the name ZBTTM,
or Zero Bus Turn-around.
Address and control signals are applied to the SRAM during one
clock cycle, and two cycles later its associated data cycle occurs, be it
read or write.
The IDT71V546 contains data I/O, address and control signal regis-
ters. Output enable is the only asynchronous signal and can be used to
disable the outputs at any given time.
A Clock Enable (CEN) pin allows operation of the IDT71V546 to be
suspended as long as necessary. All synchronous inputs are ignored
There are three chip enable pins (CE1, CE2, CE2) that allow the user
when ADV/LDis low, no new memory operation can be initiated and any
burst that was in progress is stopped. However, any pending data
cycles after the chip is deselected or a write initiated.
The IDT71V546 has an on-chip burst counter. In the burst mode, the
IDT71V546 can provide four cycles of data for a single address presented
pin. The LBOpinselectsbetweenlinearandinterleavedburstsequence.
The ADV/LD signal is used to load a new external address (ADV/LD =
LOW) or increment the internal burst counter (ADV/LD = HIGH).
The IDT71V546 SRAM utilizes a high-performance, high-volume
3.3V CMOS process, and is packaged in a JEDEC standard 14mm x
20mm 100- pin thin plastic quad flatpack (TQFP) for high board density.
Pin Description Summary
A0 - A16
CE1, CE2, CE2
Three Chip Enables
OE Output Enable
R/W Read/Write Signal
CEN Clock Enable
BW1, BW2, BW3, BW4 Individual Byte Write Selects
Advance Burst Address / Load New Address
LBO Linear / Interleaved Burst Order
I/O0 - I/O31, I/OP1 - I/OP4 Data Input/Output
VDD 3.3V Power
3821 tbl 01