CY7C453 데이터 시트보기 (PDF) - Cypress Semiconductor
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CY7C453 Datasheet PDF : 24 Pages
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CY7C451
CY7C453
CY7C454
Switching Waveforms
Write Clock Timing Diagram
tCKH
tCKW
CKW
D0 – 8
ENABLED WRITE
tSD
tHD
VALID DATA IN
ENW
tSEN
tHEN
tFH
E/F, PAFE,HF
tFD
tCKL
tSEN
DISABLED WRITE
tHEN
tFH
tFD
Read Clock Timing Diagram
tCKH
tCKR
tCKL
CKR
Q0 – 8
ENR
PREVIOUS WORD
tSEN
ENABLED READ
tOH tA
tHEN
DISABLED READ
NEW WORD
tFH
E/F,PAFE
tSEN
tHEN
tFD
tFH
tFD
[18,19,20,21]
Master Reset (Default with Free-Running Clocks) Timing Diagram
tPMR
MR
CKW
tSCMR
tMRR
ENW
CKR
tSCMR
tMRR
FIRST
WRITE
C451-6
C451-7
ENR
Q0 – 8
E/F,PAFE
HF
tOHMR
VALID DATA
tAMR
tMRF
tMRF
ALL DATA
OUTPUTS LOW
Notes:
18. To only perform reset (no programming), the following criteria must be met: ENW or CKW must be inactive while MR is LOW.
19. To only perform reset (no programming), the following criteria must be met: ENR or CKR must be inactive while MR is LOW.
20. All data outputs (Q0 – 8) go LOW as a result of the rising edge of MR after tAMR.
21. In this example, Q0 – 8 will remain valid until tOHMR if either the first read shown did not occur or if the read occurred soon enough such that the valid
data was caused by it.
Document #: 38-06033 Rev. *A
Page 7 of 24
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