74HC688
8-bit magnitude comparator
Rev. 3 — 4 July 2018
Product data sheet
1
General description
The 74HC688 is an 8-bit magnitude comparator. It performs comparisons of two 8-bit
binary or BCD words. Inputs include clamp diodes. This enables the use of current
limiting resistors to interface inputs to voltages in excess of V
CC
.
2
Features and benefits
•
•
•
•
•
Compare two 8-bit words
Wide supply voltage range from 2.0 to 6.0 V
CMOS input levels
Complies with JEDEC standard: no. 7A
ESD protection:
–
HBM JESD22-A114-F exceeds 2000 V
–
MM JESD22-A115-A exceeds 200 V
•
Multiple package options
•
Specified from -40 °C to +85 °C and from -40 °C to +125 °C
3
Ordering information
Package
Temperature range
Name
SO20
SSOP20
TSSOP20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic shrink small outline package; 20 leads;
body width 5.3 mm
plastic thin shrink small outline package; 20 leads;
body width 4.4 mm
Version
SOT163-1
SOT339-1
SOT360-1
−40 °C to +125 °C
−40 °C to +125 °C
−40 °C to +125 °C
Table 1. Ordering information
Type number
74HC688D
74HC688DB
74HC688PW
Nexperia
8-bit magnitude comparator
74HC688
4
Functional diagram
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
P0
P1
P2
P3
P4
P5
P6
P7
P=Q
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
E
1
aaa-028700
19
P7
Q7
P6
Q6
P5
Q5
P4
Figure 1. Logic symbol
COMP
1
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
7
aaa-028701
G1
0
Q4
P3
P=Q
Q3
P2
P
7
(P=Q) 1
0
19
Q2
P1
Q1
Q
P0
Q0
E
aaa-028702
Figure 3. IEC logic symbol
Figure 2. Logic diagram
74HC688
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2018. All rights reserved.
Product data sheet
Rev. 3 — 4 July 2018
2 / 16
Nexperia
8-bit magnitude comparator
74HC688
5
Pinning information
5.1 Pinning
74HC688
E
P0
Q0
P1
Q1
P2
Q2
P3
Q3
1
2
3
4
5
6
7
8
9
20 V
CC
19 P=Q
18 Q7
17 P7
16 Q6
15 P6
14 Q5
13 P5
12 Q4
11 P4
aaa-028703
74HC688
E
P0
Q0
P1
Q1
P2
Q2
P3
Q3
1
2
3
4
5
6
7
8
9
20 V
CC
19 P=Q
18 Q7
17 P7
16 Q6
15 P6
14 Q5
13 P5
12 Q4
11 P4
aaa-028704
GND 10
GND 10
Figure 4. Pin configuration SOT163-1 (SO20)
Figure 5. Pin configuration SOT339-1 (SSOP20)
and SOT360-1 (TSSOP20)
5.2 Pin description
Table 2. Pin description
Symbol
E
P0, P1, P2, P3, P4, P5, P6, P7
Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7
GND
P=Q
V
CC
Pin
1
2, 4, 6, 8, 11, 13, 15, 17
3, 5, 7, 9, 12, 14, 16, 18
10
19
20
Description
enable input (active LOW)
word P inputs
word Q inputs
ground (0 V)
equal to output
supply voltage
6
Functional description
Table 3. Function table
H = HIGH voltage level; L = LOW voltage level; X = don’t care.
inputs
data Pn, Qn
P=Q
P>Q
P<Q
X
E
L
L
L
H
output
P=Q
L
H
H
H
74HC688
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2018. All rights reserved.
Product data sheet
Rev. 3 — 4 July 2018
3 / 16
Nexperia
8-bit magnitude comparator
74HC688
7
Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V)
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
Parameter
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
T
amb
= -40 °C to +125 °C
[2]
Conditions
V
I
< -0.5 V or V
I
> V
CC
+ 0.5 V
V
O
< -0.5 V or V
O
> V
CC
+ 0.5 V
-0.5 V < V
O
< V
CC
+ 0.5 V
[1]
[1]
Min
-0.5
-
-
-
-
-50
-65
-
Max
+7
±20
±20
±25
50
-
+150
500
Unit
V
mA
mA
mA
mA
mA
°C
mW
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
[2] For SO20 Packages: P
tot
derates linearly with 8 mW/K above 70 °C.
For (T)SSOP20 Packages: P
tot
derates linearly with 5.5 mW/K above 60 °C.
8
Recommended operating conditions
Table 5. Recommended operating conditions
Voltages are referenced to GND (ground = 0 V)
Symbol
V
CC
V
I
V
O
T
amb
Δt/ΔV
Parameter
supply voltage
input voltage
output voltage
ambient temperature
input transition rise and fall rate
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
Conditions
Min
2.0
0
0
-40
-
-
-
Typ
5.0
-
-
-
-
1.67
-
Max
6.0
V
CC
V
CC
+125
625
139
83
Unit
V
V
V
°C
ns/V
ns/V
ns/V
74HC688
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2018. All rights reserved.
Product data sheet
Rev. 3 — 4 July 2018
4 / 16
Nexperia
8-bit magnitude comparator
74HC688
9
Static characteristics
Table 6. Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol
Parameter
Conditions
Min
V
IH
HIGH-level input V
CC
= 2.0 V
voltage
V
CC
= 4.5 V
V
CC
= 6.0 V
V
IL
LOW-level input V
CC
= 2.0 V
voltage
V
CC
= 4.5 V
V
CC
= 6.0 V
V
OH
HIGH-level
output voltage
V
I
= V
IH
or V
IL
I
O
= -20 μA; V
CC
= 2.0 V
I
O
= -20 μA; V
CC
= 4.5 V
I
O
= -20 μA; V
CC
= 6.0 V
I
O
= -4.0 mA; V
CC
= 4.5 V
I
O
= -5.2 mA; V
CC
= 6.0 V
V
OL
LOW-level
output voltage
V
I
= V
IH
or V
IL
I
O
= 20 μA; V
CC
= 2.0 V
I
O
= 20 μA; V
CC
= 4.5 V
I
O
= 20 μA; V
CC
= 6.0 V
I
O
= 4.0 mA; V
CC
= 4.5 V
I
O
= 5.2 mA; V
CC
= 6.0 V
I
I
I
CC
C
I
input leakage
current
supply current
input
capacitance
V
I
= V
CC
or GND; V
CC
= 6.0 V
V
I
= V
CC
or GND; I
O
= 0 A;
V
CC
= 6.0 V
-
-
-
-
-
-
-
-
0
0
0
0.15
0.16
-
-
3.5
0.1
0.1
0.1
0.26
0.26
±0.1
8.0
-
-
-
-
-
-
-
-
-
0.1
0.1
0.1
0.33
0.33
±1
80
-
-
-
-
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
±1
160
-
V
V
V
V
V
μA
μA
pF
1.9
4.4
5.9
3.98
5.48
2.0
4.5
6.0
4.32
5.81
-
-
-
-
-
1.9
4.4
5.9
3.84
5.34
-
-
-
-
-
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
V
V
V
V
V
1.5
3.15
4.2
-
-
-
25 °C
Typ
1.2
2.4
3.2
0.8
2.1
2.8
Max
-
-
-
0.5
1.35
1.8
-40 °C to
+85 °C
Min
1.5
3.15
4.2
-
-
-
Max
-
-
-
0.5
1.35
1.8
-40 °C to
+125 °C
Min
1.5
3.15
4.2
-
-
-
Max
-
-
-
0.5
1.35
1.8
V
V
V
V
V
V
Unit
74HC688
All information provided in this document is subject to legal disclaimers.
© Nexperia B.V. 2018. All rights reserved.
Product data sheet
Rev. 3 — 4 July 2018
5 / 16
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