MC74VHCT259A
http://onsemi.com
6
TIMING REQUIREMENTS (Input tr = tf = 3.0ns)
Symbol
Parameter
Test Conditions
TA = 25°C
TA = ≤ 85°C
TA = ≤ 125°C
Unit
Min
Typ
Max
Min
Max
Min
Max
tw
Minimum Pulse Width, Reset or Enable
VCC = 3.3 ± 0.3V
5.0
5.5
5.5
ns
VCC = 5.0 ± 0.5V
5.0
5.5
5.5
tsu
Minimum Setup Time, Address or Data to Enable
VCC = 3.3 ± 0.3V
4.5
4.5
4.5
ns
VCC = 5.0 ± 0.5V
3.0
3.0
3.0
th
Minimum Hold Time, Enable to Address or Data
VCC = 3.3 ± 0.3V
2.0
2.0
2.0
ns
VCC = 5.0 ± 0.5V
2.0
2.0
2.0
tr, tf
Maximum Input, Rise and Fall Times
VCC = 3.3 ± 0.3V
400
300
300
ns
VCC = 5.0 ± 0.5V
200
100
100
50%
tPHL
50%
tPHL
DATA IN
ADDRESS
SELECT
OUTPUT Q
VCC
GND
VCC
GND
VCC
GND
*Includes all probe and jig capacitance
Figure 6. Switching Waveform
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
OUTPUT Q
DATA IN
50%
tPLH
tPHL
tf
GND
VCC
50%
Figure 7. Switching Waveform
tr
Figure 8. Switching Waveform
Figure 9. Switching Waveform
Figure 10. Switching Waveform
Figure 11. Test Circuit
50%
tw
50%
tPHL
DATA IN
OUTPUT Q
RESET
VCC
GND
VCC
GND
VCC
GND
VCC
GND
DATA IN
OUTPUT Q
ENABLE
DATA IN
OR
ADDRESS
SELECT
ENABLE
VCC
GND
VCC
GND
tw
50%
tPHL
50%
tsu
th(H)
tsu