Diodes 74AHCT138 - Manual (Page 5)

74AHCT138
Document number: DS35483 Rev. 2 - 2
5 of 9
www.diodes.com
June 2013
© Diodes Incorporated
74AHCT138
Switching Characteristics
Symbol Parameter Test Conditions V
CC
T
A
= +25°C -40°C to +85°C -40°C to +125°C
Unit
Min Typ Max Min Max Min Max
t
PD
Propagation Delay
An to Yn Figure 2 C
L
=15pF 4.5V to 5.5V 0.5 4.4 10.4 1.0 12.0 1.0 13.0
ns
Figure 2 C
L
= 50pF 4.5V to 5.5V 0.5 6.2 11.4 1.0 13.0 1.0 14.5
Propagation Delay
E3 to Yn Figure 2 C
L
= 15pF 4.5V to 5.5V 0.5 4.3 9.1 1.0 10.5 1.0 11.5
ns
Figure 2 C
L
= 50pF 4.5V to 5.5V 0.5 6.2 10.1 1.0 11.5 1.0 13.0
Propagation Delay
En to Yn Figure 2 C
L
= 15pF 4.5V to 5.5V 0.5 4.3 9.6 1.0 11.0 1.0 12.0
ns
Figure 2 C
L
= 50pF 4.5V to 5.5V 0.5 6.2 10.6 1.0 12.0 1.0 13.5
Operating Characteristics (@T
A
= +25°C, unless otherwise specified.)
Parameter
Test
Conditions
V
CC
= 5V
Unit
Typ
C
pd
Power dissipation
capacitance
f = 1 MHz all outputs switching-no load 23 pF
Parameter Measurement Information
V
CC
Inputs V
M
C
L
V
I
t
r
/t
f
Input Output
4.5V to 5.5V 3.0 V 3ns 1.5 V V
CC
/2 15pF, 50pF
Voltage Waveform
Pulse Duration
Voltage Waveform
Propagation Delay Times
Inverting and Non Inverting Outputs
Notes: A. Includes test lead and test apparatus capacitance.
B. All pulses are supplied at pulse repetition rate ≤ 10 MHz.
C. Inputs are measured separately one transition per measurement.
D. t
PLH
and t
PHL
are the same as t
PD
.