CY7C198 查看數據表（PDF） - Cypress Semiconductor
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CY7C198 Datasheet PDF : 9 Pages
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7Rce1v9is8io: n1:0F/2e5b/r8u9ary 29, 1996
CY7C198
Switching Waveforms
Read Cycle No. 1[26, 27]
tRC
ADDRESS
DATA OUT
tOHA tAA
PREVIOUS DATA VALID
Read Cycle No. 2[27, 28]
CE
tRC
tACE
OE
DATA OUT
CUSRURPEVPNCLYTC
HIGH IMPEDAtLNZCOEE tDOE
tLZCE
tPU
50%
DATA VALID
Write Cycle No. 1 (WE Controlled)[24, 29, 30]
ADDRESS
CE
WE
tSA
tWC
tAW
tPWE
DATA VALID
C198Ć7
ttHHZZOCEE
IMPHEIDGAHNCE
tPD
50%
ICC
ISB
C198Ć8
tHA
OE
DATA I/O
tHZOE
Notes:
26. Device is continuously selected. OE, CE = VIL.
27. WE is HIGH for read cycle.
28. Address valid prior to or coincident with CE transition LOW.
tSD
tHD
DATAIN VALID
C198Ć9
29. Data I/O is high impedance if OE = VIH.
30. If CE goes HIGH simultaneously with WE HIGH, the output remains
in a highĆimpedance state.
5
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