Integrated Device Technology, Inc.
鈥?/div>
UB
and
LB
are available for bus matching to x8 or x16
busses; also support very fast banking
鈥?TTL-compatible, single 5V (鹵10%) power supply
鈥?Available in a 100-pin Thin Quad Plastic Flatpack (TQFP)
and a 108-pin ceramic Pin Grid Array (PGA)
The IDT707288 is a high-speed 64K x 16 (1M bit) Bank-
Switchable Dual-Ported SRAM organized into four indepen-
dent 16K x 16 banks. The device has two independent ports
with separate controls, addresses, and I/O pins for each port,
allowing each port to asynchronously access any 16K x 16
memory block not already accessed by the other port. Ac-
cesses by the ports into specific banks are controlled via bank
select pin inputs under the user's control. Mailboxes are
provided to allow inter-processor communications. Interrupts
are provided to indicate mailbox writes have occurred. An
automatic power down feature controlled by the chip enables
(
CE
0
and CE
1
) permits the on-chip circuitry of each port to
enter a very low standby power mode and allows fast depth
expansion.
The IDT707288 offers a maximum address-to-data access
time as fast as 20ns, while typically operating on only 900mW
of power, and is available in a 100-pin Thin Quad Plastic
Flatpack (TQFP) and a 108-pin ceramic Pin Grid Array (PGA).
R/
FUNCTIONAL BLOCK DIAGRAM
R/
L
0L
CE
1L
L
L
L
MUX
R
CONTROL
LOGIC
16Kx16
MEMORY
ARRAY
(BANK 0)
MUX
CONTROL
LOGIC
0R
CE
1R
R
R
R
I/O
8L-15L
I/O
0L-7L
I/O
CONTROL
MUX
16Kx16
MEMORY
ARRAY
(BANK 1)
MUX
I/O
CONTROL
I/O
8R-15R
I/O
0R-7R
A
13L
A
0L(1)
ADDRESS
DECODE
ADDRESS
DECODE
A
13R
A
0R(1)
BA
1L
BA
0L
BANK
DECODE
MUX
16Kx16
MEMORY
ARRAY
(BANK 3)
MUX
BANK
DECODE
BA
1R
BA
0R
BKSEL
3(2)
BKSEL
0(2)
BANK
SELECT
A
5L(1)
A
0L(1)
L
/
L
L
MAILBOX
INTERRUPT
LOGIC
A
5R(1)
A
0R(1)
R
/
R
R
R/
L
L
L
L
R/
R
R
R
R
3592 drw 01
NOTES:
1. The first six address pins for each port serve dual functions. When
MBSEL
= V
IH
, the pins serve as memory address inputs. When
MBSEL
= V
IL
, the pins
serve as mailbox address inputs.
2. Each bank has an input pin assigned that allows the user to toggle the assignment of that bank between the two ports. Refer to Table I for more details.
The IDT logo is a registered trademark of Integrated Device Technology
COMMERCIAL TEMPERATURE RANGE
漏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.
OCTOBER 1996
DSC-3592/-
6.29
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