參數(shù)資料
型號(hào): IDT71028S20YG8
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: SRAM
英文描述: 256K X 4 STANDARD SRAM, 20 ns, PDSO28
封裝: 0.400 INCH, ROHS COMPLIANT, PLASTIC, SOJ-28
文件頁數(shù): 6/8頁
文件大?。?/td> 457K
代理商: IDT71028S20YG8
6.42
IDT71028 CMOS Static RAM
1 Meg (256K x 4-Bit) Commercial and Industrial Temperature Ranges
Timing Waveform of Write Cycle No. 1 (
WE
Controlled Timing)
(1,2,4)
Timing Waveform of Write Cycle No. 2 (
CS
Controlled Timing)
(1,4)
NOTES:
1. A write occurs during the overlap of a LOW
CS
and a LOW
WE
.
2.
OE
is continuously HIGH. If during a
WE
controlled write cycle
OE
is LOW, t
WP
must be greater than or equal to t
WHZ
+ t
DW
to allow the I/O drivers to turn off and data to be placed
on the bus for the required t
DW
. If
OE
is HIGH during a
WE
controlled write cycle, this requirement does not apply and the mnimumwrite pulse is as short as the specified t
WP
.
3. During this period, I/O pins are in the output state, and input signals must not be applied.
4. If the
CS
LOW transition occurs simultaneously with or after the
WE
LOW transition, the outputs remain in a high-impedance state.
5. Transition is measured ±200mV fromsteady state.
CS
ADDRESS
WE
2966 drw 08
DATA
IN
VALID
t
AW
t
WC
t
CW
t
AS
t
WR
t
DW
t
DH
DATA
IN
ADDRESS
CS
WE
DATA
OUT
DATA
IN
2966 drw 07
(6)
(3)
(3)
(2)
(5)
(5)
DATA
IN
VALID
HIGH IMPEDANCE
t
WC
t
AS
t
WHZ
t
WP
t
CHZ
t
OW
t
DW
t
DH
t
WR
t
AW
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