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74HCT688PW,112

P1-P3P4-P6P7-P8
December 1990 3
Philips Semiconductors Product specification
8-bit magnitude comparator 74HC/HCT688
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
1
E enable input (active LOW)
2, 4, 6, 8, 11, 13, 15, 17 P
0
to P
7
word inputs
3, 5, 7, 9, 12, 14, 16, 18 Q
0
to Q
7
word inputs
10 GND ground (0 V)
19
P = Q equal to output
20 V
CC
positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.
December 1990 4
Philips Semiconductors Product specification
8-bit magnitude comparator 74HC/HCT688
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
INPUTS OUTPUT
DATA P
n
, Q
n
ENABLE E P = Q
P=Q
X
P>Q
P<Q
L
H
L
L
L
H
H
H
Fig.4 Functional diagram. Fig.5 Logic diagram.
December 1990 5
Philips Semiconductors Product specification
8-bit magnitude comparator 74HC/HCT688
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)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
P
n
, Q
n
to P = Q
55
20
16
170
34
29
215
43
37
255
51
43
ns
2.0
4.5
6.0
Fig.6
t
PHL
/ t
PLH
propagation delay
E to P = Q
28
10
8
120
24
20
150
30
26
180
36
31
ns
2.0
4.5
6.0
Fig.7
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
Figs 6 and 7
P1-P3P4-P6P7-P8

74HCT688PW,112

Mfr. #:
Buy 74HCT688PW,112
Manufacturer:
NXP Semiconductors
Description:
Logic Comparators 8-BIT MAGNITUDE
Lifecycle:
New from this manufacturer.
Delivery:
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