CY7C187
Switching Characteristics Over the Operating Range[6] (continued)
7C187-25
7C187-35
Min. Max.
Parameters
Description
Min.
Max.
Units
READ CYCLE
tRC
Read Cycle Time
25
5
35
5
ns
ns
ns
ns
ns
ns
ns
ns
tAA
Address to Data Valid
25
25
10
20
35
35
15
20
tOHA
Output Hold from Address Change
CE LOW to Data Valid
CE LOW to Low Z[7]
tACE
tLZCE
5
5
tHZCE
CE HIGH to High Z[7, 8]
tPU
CE LOW to Power Up
0
0
tPD
CE HIGH to Power Down
WRITE CYCLE[9]
tWC
Write Cycle Time
20
20
20
0
25
25
25
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tSCE
tAW
CE LOW to Write End
Address Set-Up to Write End
Address Hold from Write End
Address Set-Up to Write Start
WE Pulse Width
tHA
tSA
0
0
tPWE
tSD
15
10
0
20
15
0
Data Set-Up to Write End
Data Hold from Write End
WE HIGH to Low
tHD
tLZWE
tHZWE
5
5
WE LOW to High Z[8]
7
10
Switching Waveforms
Read Cycle No. 1[10, 11]
t
RC
ADDRESS
t
AA
t
OHA
DATA OUT
PREVIOUS DATA VALID
DATA VALID
C187–6
Notes:
10. WE is HIGH for read cycle.
11. Device is continuously selected, CE = VIL
.
Document #: 38-05044 Rev. **
Page 4 of 9
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