Philips Semiconductors
Product specification
4-bit magnitude comparator
74HC/HCT85
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
UNIT LOAD COEFFICIENT
IA<B
IA>B
IA=B
An, Bn
1.00
1.00
1.50
1.50
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HCT
SYMBOL PARAMETER
VCC
+25
−40 to +85 −40 to +125 UNIT
WAVEFORMS
(V)
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
An, Bn to QA>B or QA<B
26
24
18
44
40
31
55
50
39
66
60
47
ns
ns
ns
4.5 Fig.6
4.5 Fig.6
4.5 Fig.6
t
PHL/ tPLH propagation delay
An, Bn to QA=B
t
PHL/ tPLH propagation delay
I
A<B, IA=B, IA>B to
QA<B, QA>B
tPHL/ tPLH propagation delay
IA=B to QA=B
18
7
31
15
39
19
47
22
ns
ns
4.5 Fig.6
4.5 Fig.6
t
THL/ tTLH output transition time
December 1990
7
NXP [ NXP ]
