IDT71V67602, IDT71V67802, 256K x 36, 512K x 18, 3.3V Synchronous
SRAMs with 2.5V I/O, Pipelined Outputs, Single Cycle Deselect
Commercial and Industrial Temperature Ranges
PinDefinitions(1)
Symbol
Pin Function
I/O
Active
Description
0
18
A -A
ADSC
ADSP
ADV
Address Inputs
I
N/A
Synchronous Address inputs. The address register is triggered by a combination of the
rising edge of CLK and ADSC Low or ADSP Low and CE Low.
Address Status
(Cache Controller)
I
I
I
LOW
LOW
LOW
Synchronous Address Status from Cache Controller. ADSC is an active LOW input that is
used to load the address registers with new addresses.
Address Status
(Processor)
Synchronous Address Status from Processor. ADSP is an active LOW input that is used to
load the address registers with new addresses. ADSP is gated by CE.
Burst Address
Advance
Synchronous Address Advance. ADV is an active LOW input that is used to advance the
internal burst counter, controlling burst access after the initial address is loaded. When the
input is HIGH the burst counter is not incremented; that is, there is no address advance.
1
4
Byte Write Enable
I
LOW
Synchronous byte write enable gates the byte write inputs BW -BW . If BWE is LOW at the
rising edge of CLK then BWx inputs are passed to the next stage in the circuit. If BWE is
HIGH then the byte write inputs are blocked and only GW can initiate a write cycle.
BWE
1
0-7
P1
2
8-15
P2
Individual Byte
Write Enables
I
I
I
LOW
LOW
N/A
Synchronous byte write enables. BW controls I/O , I/O , BW controls I/O , I/O , etc.
1
4
BW -BW
Any active byte write causes all outputs to be disabled.
0
1
Chip Enable
Synchronous chip enable. CE is used with CS and CS to enable the IDT71V67602/7802.
CE
CE also gates ADSP.
CLK
Clock
This is the clock input. All timing references for the device are made with respect to this
input.
0
0
1
CS
Chip Select 0
Chip Select 1
I
I
I
HIGH
LOW
LOW
Synchronous active HIGH chip select. CS is used with CE and CS to enable the chip.
1
0
Synchronous active LOW chip select. CS is used with CE and CS to enable the chip.
1
CS
Global Write
Enable
Synchronous global write enable. This input will write all four 9-bit data bytes when LOW
on the rising edge of CLK. GW supersedes individual byte write enables.
GW
0
31
I/O -I/O
Data Input/Output
I/O
I
N/A
Synchronous data input/output (I/O) pins. Both the data input path and data output path are
registered and triggered by the rising edge of CLK.
P1
I/O -I/O
P4
Linear Burst Order
LOW
Asynchronous burst order selection input. When LBO is HIGH, the interleaved burst
sequence is selected. When LBO is LOW the Linear burst sequence is selected. LBO is a
static input and must not change state while the device is operating.
LBO
Output Enable
I
LOW
Asynchronous output enable. When OE is LOW the data output drivers are enabled on the
I/O pins if the chip is also selected. When OE is HIGH the I/O pins are in a high-
impedance state.
OE
VDD
Power Supply
Power Supply
Ground
N/A
N/A
N/A
N/A
I
N/A
N/A
3.3V core power supply.
DDQ
V
2.5V I/O Supply.
SS
V
N/A
Ground.
NC
ZZ
No Connect
Sleep Mode
N/A
NC pins are not electrically connected to the device.
HIGH
Asynchronous sleep mode input. ZZ HIGH will gate the CLK internally and power down the
IDT71V67602/7802 to its lowest power consumption level. Data retention is guaranteed in
Sleep Mode.
5311 tbl 02
NOTE:
1. All synchronous inputs must meet specified setup and hold times with respect to CLK.
6.422
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