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CY7C245A
Document #: 38-04007 Rev. *D
Page 5 of 12
AC Test Loads and Waveforms[4, 5]
Switching Characteristics Over Operating Range[4, 5]
Parameter
Description
7C245A-15
7C245A-18
7C245A-35
7C245A-25
7C245A-35
Unit
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
tSA
Address Set-Up to Clock HIGH
15
18
25
35
45
ns
tHA
Address Hold from Clock HIGH
0
0
0
0
0
ns
tCO
Clock HIGH to Valid Output
10
12
12
15
25
ns
tPWC
Clock Pulse Width
10
12
15
20
20
ns
tSES
ES Set-Up to Clock HIGH
10
10
12
15
15
ns
tHES
ES Hold from Clock HIGH
5
5
5
5
5
ns
tDI
Delay from INIT to Valid Output
15
20
20
20
35
ns
tRI
INIT Recovery to Clock HIGH
10
12
15
20
20
ns
tPWI
INIT Pulse Width
10
12
15
20
25
ns
tCOS
Valid Output from Clock HIGH[8]
15
15
15
20
30
ns
tHZC
Inactive Output from Clock
HIGH[8]
15
15
15
20
30
ns
tDOE
Valid Output from E LOW[9]
12
15
15
20
30
ns
tHZE
Inactive Output from E HIGH[9]
15
15
15
20
30
ns
Notes:
8. Applies only when the synchronous (ES) function is used.
9. Applies only when the asynchronous (E) function is used.
3.0V
5V
OUTPUT
R1 250
Ω
R2
167
Ω
50 pF
INCLUDING
JIG AND
SCOPE
GND
90%
10%
90%
10%
5ns
5 ns
5V
OUTPUT
5pF
INCLUDING
JIG AND
SCOPE
(b) High Z Load
OUTPUT
2.0V
Equivalent to:
TH ÉVENIN EQUIVALENT
100
Ω
R1 250
Ω
(a) Normal Load
R2
167
Ω
ALL INPUT PULSES
≤
≤
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