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CY7C138
CY7C139
5
Switching Characteristics Over the Operating Range[8]
Parameter
Description
7C138-15
7C139-15
7C138-25
7C139-25
7C138-35
7C139-35
7C138-55
7C139-55
Unit
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
READ CYCLE
tRC
Read Cycle Time
15
25
35
55
ns
tAA
Address to Data Valid
15
25
35
55
ns
tOHA
Output Hold From Address Change
3
3
3
3
ns
tACE
CE LOW to Data Valid
15
25
35
55
ns
tDOE
OE LOW to Data Valid
10
15
20
25
ns
tLZOE
[9,10,11]
OE Low to Low Z
3
3
3
3
ns
tHZOE
[9,10,11]
OE HIGH to High Z
10
15
20
25
ns
tLZCE
[9,10,11]
CE LOW to Low Z
3
3
3
3
ns
tHZCE
[9,10,11]
CE HIGH to High Z
10
15
20
25
ns
tPU
[11]
CE LOW to Power-Up
0
0
0
0
ns
tPD
[11]
CE HIGH to Power-Down
15
25
35
55
ns
WRITE CYCLE
tWC
Write Cycle Time
15
25
35
55
ns
tSCE
CE LOW to Write End
12
20
30
40
ns
tAW
Address Set-Up to Write End
12
20
30
40
ns
tHA
Address Hold From Write End
2
2
2
2
ns
tSA
Address Set-Up to Write Start
0
0
0
0
ns
tPWE
Write Pulse Width
12
20
25
30
ns
tSD
Data Set-Up to Write End
10
15
15
20
ns
tHD
Data Hold From Write End
0
0
0
0
ns
tHZWE
[10,11]
R/W LOW to High Z
10
15
20
25
ns
tLZWE
[10,11]
R/W HIGH to Low Z
3
3
3
3
ns
tWDD
[12]
Write Pulse to Data Delay
30
50
60
70
ns
tDDD
[12]
Write Data Valid to Read Data Valid
25
30
35
40
ns
BUSY TIMING[13]
tBLA
BUSY LOW from Address Match
15
20
20
45
ns
tBHA
BUSY HIGH from Address Mismatch
15
20
20
40
ns
tBLC
BUSY LOW from CE LOW
15
20
20
40
ns
tBHC
BUSY HIGH from CE HIGH
15
20
20
35
ns
tPS
Port Set-Up for Priority
5
5
5
5
ns
tWB
R/W LOW after BUSY LOW
0
0
0
0
ns
tWH
R/W HIGH after BUSY HIGH
13
20
30
40
ns
tBDD
[14]
BUSY HIGH to Data Valid
Note
13
Note
13
Note
13
Note
13
ns
INTERRUPT TIMING[13]
tINS
INT Set Time
15
25
25
30
ns
tINR
INT Reset Time
15
25
25
30
ns
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