CY7C261
CY7C263/CY7C264
AC Test Loads and Waveforms[4]
Test Load for -20 through -30 speeds
R1 500
R1 500Ω
(658Ω MIL)
(658Ω MIL)
5V
5V
3.0V
GND
90%
90%
OUTPUT
OUTPUT
10%
10%
R2 333Ω
(403Ω MIL)
R2 333Ω
(403Ω MIL)
30 pF
5 pF
≤ 5 ns
≤ 5 ns
INCLUDING
JIG AND
SCOPE
INCLUDING
JIG AND
SCOPE
(a) Normal Load
(b) HighZ Load
Equivalent to:
OUTPUT
THÉVENIN EQUIVALENT
200Ω (250Ω MIL)
R
TH
2.0V(1.9VMIL)
Test Load for -35 through -55 speeds
R1250Ω
R1 250Ω
5V
5V
OUTPUT
OUTPUT
30pF
5 pF
R2167 Ω
R2167 Ω
INCLUDING
JIG AND
SCOPE
INCLUDING
JIG AND
SCOPE
(c) Normal Load
(d) HighZ Load
Equivalent to: THÉVENINEQUIVALENT
100Ω
R
TH
OUTPUT
2.0V
Switching Characteristics Over the Operating Range [1,3,4
]
7C261-20
7C263-20
7C264-20
7C261-25
7C263-25
7C264-25
7C261-35
7C263-35
7C264-35
7C261-45
7C263-45
7C264-45
7C261-55
7C263-55
7C264-55
Parameter
tAA
Description
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Unit
Address to Output Valid
20
12
25
12
35
20
45
30
55
35
ns
ns
tHZCS1
Chip Select Inactive to High Z
(7C263 and 7C264)
tHZCS2
tACS1
tACS2
tPU
Chip Select Inactive to High Z
(7C261)
20
12
20
25
12
25
35
20
35
45
30
45
55
35
55
ns
ns
ns
ns
ns
Chip Select Active to Output Valid
(7C263 and 7C264)
Chip Select Active to Output Valid
(7C261)
Chip Select Active to Power-Up
(7C261)
0
0
0
0
0
tPD
Chip Select Inactive to
Power-Down (7C261)
20
25
35
45
55
Document #: 38-04010 Rev. *B
Page 4 of 14
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