Datasheet

December 1990 6
Philips Semiconductors Product specification
4-bit magnitude comparator 74HC/HCT85
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications” .
Output capability: standard
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF
SYMBOL PARAMETER
T
amb
(°C) TEST CONDITIONS
74HC
UNIT
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
, B
n
to Q
A>B
or Q
A<B
63
23
18
195
39
33
245
49
42
295
59
50
ns 2.0
4.5
6.0
Fig.6
t
PHL
/ t
PLH
propagation delay
A
n
, B
n
to Q
A=B
58
21
17
175
35
30
220
44
37
265
53
45
ns 2.0
4.5
6.0
Fig.6
t
PHL
/ t
PLH
propagation delay
I
A<B
, I
A=B
, I
A>B
to
Q
A<B
, Q
A>B
50
18
14
140
28
24
175
35
30
210
42
36
ns 2.0
4.5
6.0
Fig.6
t
PHL
/ t
PLH
propagation delay
I
A=B
to Q
A=B
39
14
11
120
24
20
150
30
26
180
36
31
ns 2.0
4.5
6.0
Fig.6
t
THL
/ t
TLH
output transition time 19
7
6
75
15
13
95
19
16
110
22
19
ns 2.0
4.5
6.0
Fig.6