CY7C261
CY7C263/CY7C264
AC Test Loads and Waveforms
[4]
Test Load for -20 through -30 speeds
R1 500
(658Ω MIL)
5V
OUTPUT
30 pF
INCLUDING
JIG AND
SCOPE
5V
OUTPUT
R2 333Ω
(403Ω MIL)
5 pF
INCLUDING
JIG AND
SCOPE
R2 333Ω
(403Ω MIL)
R1 500Ω
(658Ω MIL)
3.0V
GND
≤
5 ns
90%
10%
90%
10%
≤
5 ns
(a) Normal Load
Equivalent to:
(b) High Z Load
THÉVENIN EQUIVALENT
R
TH
200Ω (250Ω MIL)
OUTPUT
2.0V(1.9VMIL)
Test Load for -35 through -55 speeds
R1250
Ω
5V
OUTPUT
30pF
INCLUDING
JIG AND
SCOPE
5V
OUTPUT
R2167
Ω
5 pF
INCLUDING
JIG AND
SCOPE
R2167
Ω
R1 250Ω
(c) Normal Load
Equivalent to:
THÉVENIN EQUIVALENT
R
TH
100Ω
2.0V
(d) High Z Load
OUTPUT
Switching Characteristics
Over the Operating Range
[1,3,4
]
7C261-20
7C263-20
7C264-20
Parameter
t
AA
t
HZCS1
t
HZCS2
t
ACS1
t
ACS2
t
PU
t
PD
Description
Address to Output Valid
Chip Select Inactive to High Z
(7C263 and 7C264)
Chip Select Inactive to High Z
(7C261)
Chip Select Active to Output Valid
(7C263 and 7C264)
Chip Select Active to Output Valid
(7C261)
Chip Select Active to Power-Up
(7C261)
Chip Select Inactive to
Power-Down (7C261)
0
20
Min.
Max.
20
12
20
12
20
0
25
7C261-25
7C263-25
7C264-25
Min.
Max.
25
12
25
12
25
0
35
7C261-35
7C263-35
7C264-35
Min.
35
20
35
20
35
0
45
7C261-45
7C263-45
7C264-45
Max.
45
30
45
30
45
0
55
7C261-55
7C263-55
7C264-55
Min.
Max.
55
35
55
35
55
Unit
ns
ns
ns
ns
ns
ns
ns
Max. Min.
Document #: 38-04010 Rev. *B
Page 4 of 14
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