Datasheet

September 1993 6
Philips Semiconductors Product specification
3-to-8 line decoder/demultiplexer; inverting 74HC/HCT138
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications” .
Output capability: standard
I
CC
category: MSI
Note to HCT types
The value of additional quiescent supply current (∆I
CC
) for a unit load of 1 is given in the family specifications. To
determine ∆I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
INPUT UNIT LOAD COEFFICIENT
A
n
1.50
E
n
1.25
E
3
1.00
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
A
n
to Y
n
20 35 44 53 ns 4.5 Fig.6
t
PHL
/ t
PLH
propagation delay
E
3
to Y
n
18 40 50 60 ns 4.5 Fig.6
t
PHL
/ t
PLH
propagation delay
E
n
to Y
n
19 40 50 60 ns 4.5 Fig.7
t
THL
/ t
TLH
output transition
time
7 15 19 22 ns 4.5 Figs 6 and 7