CY7C187
Switching Characteristics
Over the Operating Range
[6]
(continued)
7C187-25
Parameters
READ CYCLE
t
RC
t
AA
t
OHA
t
ACE
t
LZCE
t
HZCE
t
PU
t
PD
WRITE CYCLE
[9]
t
WC
t
SCE
t
AW
t
HA
t
SA
t
PWE
t
SD
t
HD
t
LZWE
t
HZWE
Write Cycle Time
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
Data Set-Up to Write End
Data Hold from Write End
WE HIGH to Low
WE LOW to High Z
[8]
20
20
20
0
0
15
10
0
5
7
25
25
25
0
0
20
15
0
5
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Read Cycle Time
Address to Data Valid
Output Hold from Address Change
CE LOW to Data Valid
CE LOW to Low Z
[7]
CE HIGH to High Z
[7, 8]
CE LOW to Power Up
CE HIGH to Power Down
0
20
5
10
0
20
5
25
5
15
25
25
5
35
35
35
ns
ns
ns
ns
ns
ns
ns
ns
Description
Min.
Max.
7C187-35
Min.
Max.
Units
Switching Waveforms
Read Cycle No. 1
[10, 11]
t
RC
ADDRESS
t
OHA
DATA OUT
PREVIOUS DATA VALID
t
AA
DATA VALID
C187–6
Notes:
10. WE is HIGH for read cycle.
11. Device is continuously selected, CE = V
IL
.
Document #: 38-05044 Rev. **
Page 4 of 9
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