IDT70T651/9S
HIGH-SPEED 2.5V
256/128K x 36
ASYNCHRONOUS DUAL-PORT
STATIC RAM
WITH 3.3V 0R 2.5V INTERFACE
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On-chip port arbitration logic
Features
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Full on-chip hardware support of semaphore signaling
between ports
True Dual-Port memory cells which allow simultaneous
access of the same memory location
High-speed access
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Fully asynchronous operation from either port
Separate byte controls for multiplexed bus and bus
matching compatibility
– Commercial:10/12/15ns(max.)
– Industrial:10/12ns(max.)
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Sleep Mode Inputs on both ports
RapidWrite Mode simplifies high-speed consecutive write
cycles
Supports JTAG features compliant to IEEE 1149.1
Single 2.5V (±100mV) power supply for core
LVTTL-compatible, selectable 3.3V (±150mV)/2.5V (±100mV)
power supply for I/Os and control signals on each port
Available in a 256-ball Ball Grid Array, 208-pin Plastic Quad
Flatpack and 208-ball fine pitch Ball Grid Array.
Industrial temperature range (–40°C to +85°C) is available
for selected speeds
Dual chip enables allow for depth expansion without
external logic
IDT70T651/9 easily expands data bus width to 72 bits or
more using the Master/Slave select when cascading more
than one device
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M/S = VIH for BUSY output flag on Master,
M/S = VIL for BUSY input on Slave
Busy and Interrupt Flags
Green parts available, see ordering information
Functional Block Diagram
BE3L
BE3R
BE2R
BE2L
BE1L
BE0L
BE1R
BE0R
R/
WL
R/
WR
B B B B B B B B
E E E E E E E E
0
L
1
L
2
L
3
L
3 2 1 0
R R R R
CE0L
CE1L
CE0R
CE1R
OEL
OE
R
Dout0-8_L
Dout0-8_R
Dout9-17_L
Dout9-17_R
Dout18-26_R
Dout27-35_R
Dout18-26_L
Dout27-35_L
256/128K x 36
MEMORY
ARRAY
I/O0L- I/O35L
Di n_L
Di n_R
I/O0R -I/O35R
(1)
A
17R
0R
(1)
17L
Address
Decoder
A
Address
Decoder
ADDR_L
ADDR_R
A
A
0L
CE0L
CE1L
ARBITRATION
CE0R
CE1R
TDI
TCK
TMS
TRST
INTERRUPT
SEMAPHORE
LOGIC
JTAG
TDO
OE
L
OE
R
R/W
L
R/W
R
(2,3)
(3)
(2,3)
R
BUSY
L
BUSY
SEM
M/S
SEM
L
R
(3)
R
INT
L
INT
ZZ
CONTROL
LOGIC
(4)
(4)
ZZR
ZZL
NOTES:
1. Address A17x is a NC for IDT70T659.
2. BUSY is an input as a Slave (M/S=VIL) and an output when it is a Master (M/S=VIH).
3. BUSY and INT are non-tri-state totem-pole outputs (push-pull).
4869 drw 01
4. The sleep mode pin shuts off all dynamic inputs, except JTAG inputs, when asserted. OPTx, INTx, M/S and the sleep
mode pins themselves (ZZx) are not affected during sleep mode.
JULY 2015
1
DSC-5632/8
©2015 Integrated Device Technology, Inc.