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SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D DECEMBER 1982 REVISED AUGUST 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
Wide Operating Voltage Range of 2 V to 6 V
D
High-Current Outputs Drive Up To 10
LSTTL Loads
D
Low Power Consumption, 80-
A Max I
CC
D
Typical t
pd
= 14 ns
D
4-mA Output Drive at 5 V
D
Low Input Current of 1
A Max
D
Compare Two 8-Bit Words
SN54HC688 . . . J OR W PACKAGE
SN74HC688 . . . DW, N, OR PW PACKAGE
(TOP VIEW)
SN54HC688 . . . FK PACKAGE
(TOP VIEW)
3
2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
Q7
P7
Q6
P6
Q5
P1
Q1
P2
Q2
P3
Q0
OE
P5
Q3
GND
P4
P0
V
CC
P
= Q
Q4
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
P0
Q0
P1
Q1
P2
Q2
P3
Q3
GND
V
CC
P = Q
Q7
P7
Q6
P6
Q5
P5
Q4
P4
description/ordering information
These identity comparators perform comparisons of two 8-bit binary or BCD words. An output-enable (OE) input
may be used to force the output to the high level.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
40 C to 85 C
PDIP N
Tube of 20
SN74HC688N
SN74HC688N
40 C to 85 C
SOIC DW
Tube of 25
SN74HC688DW
HC688
40
C to 85
C
SOIC DW
Reel of 2000
SN74HC688DWR
HC688
TSSOP PW
Tube of 2000
SN74HC688PWR
HC688
TSSOP PW
Reel of 250
SN74HC688PWT
HC688
55 C to 125 C
CDIP J
Tube of 20
SNJ54HC688J
SNJ54HC688J
55
C to 125
C
CFP W
Tube of 85
SNJ54HC688W
SNJ54HC688W
LCCC FK
Tube of 55
SNJ54HC688FK
SNJ54HC688FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
OUTPUT
DATA
P, Q
OE
OUTPUT
P = Q
P = Q
L
L
P > Q
X
H
P < Q
X
H
X
H
H
Copyright
2003, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D DECEMBER 1982 REVISED AUGUST 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
logic diagram (positive logic)
2
3
4
5
6
7
8
9
11
12
13
P0
P1
P2
P3
P4
P5
Q0
Q1
Q2
Q3
Q4
P = Q
14
15
16
17
18
1
P6
Q5
P7
Q6
Q7
19
OE
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
0.5 V to 7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0 or V
I
> V
CC
) (see Note 1)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0 or V
O
> V
CC
) (see Note 1)
20 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous output current, I
O
(V
O
= 0 to V
CC
)
25 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through V
CC
or GND
50 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Note 2): DW package
58
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
69
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PW package
83
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. The package thermal impedance is calculated in accordance with JESD 51-7.
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D DECEMBER 1982 REVISED AUGUST 2003
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions (see Note 3)
SN54HC688
SN74HC688
UNIT
MIN
NOM
MAX
MIN
NOM
MAX
UNIT
VCC
Supply voltage
2
5
6
2
5
6
V
V
High-level input voltage
VCC = 2 V
1.5
1.5
V
VIH
High-level input voltage
VCC = 4.5 V
3.15
3.15
V
IH
VCC = 6 V
4.2
4.2
V
Low-level input voltage
VCC = 2 V
0.5
0.5
V
VIL
Low-level input voltage
VCC = 4.5 V
1.35
1.35
V
IL
VCC = 6 V
1.8
1.8
VI
Input voltage
0
VCC
0
VCC
V
VO
Output voltage
0
VCC
0
VCC
V
t
Input transition (rise and fall) time
VCC = 2 V
1000
1000
ns
tt
Input transition (rise and fall) time
VCC = 4.5 V
500
500
ns
t
VCC = 6 V
400
400
TA
Operating free-air temperature
55
125
40
85
C
NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
TA = 25
C
SN54HC688
SN74HC688
UNIT
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
V
V = V
or V
I
= 20 A
2 V
1.9
1.998
1.9
1.9
V
V
V = V
or V
IOH = 20
A
4.5 V
4.4
4.499
4.4
4.4
V
VOH
VI = VIH or VIL
OH
6 V
5.9
5.999
5.9
5.9
V
OH
I
IH
IL
IOH = 4 mA
4.5 V
3.98
4.3
3.7
3.84
IOH = 5.2 mA
6 V
5.48
5.8
5.2
5.34
V
V = V
or V
I
= 20 A
2 V
0.002
0.1
0.1
0.1
V
V
V = V
or V
IOL = 20
A
4.5 V
0.001
0.1
0.1
0.1
V
VOL
VI = VIH or VIL
OL
6 V
0.001
0.1
0.1
0.1
V
OL
I
IH
IL
IOL = 4 mA
4.5 V
0.17
0.26
0.4
0.33
IOL = 5.2 mA
6 V
0.15
0.26
0.4
0.33
II
VI = VCC or 0
6 V
0.1
100
1000
1000
nA
ICC
VI = VCC or 0,
IO = 0
6 V
8
160
80
A
Ci
2 V to 6 V
3
10
10
10
pF
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D DECEMBER 1982 REVISED AUGUST 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
TO
VCC
TA = 25
C
SN54HC688
SN74HC688
UNIT
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
t
P or Q
P = Q
2 V
113
210
313
265
ns
t
P or Q
P = Q
4.5 V
30
42
63
53
ns
tpd
6 V
24
36
53
45
ns
tpd
OE
P = Q
2 V
66
120
179
151
ns
OE
P = Q
4.5 V
16
24
36
30
6 V
14
20
30
26
t
Any
2 V
38
75
110
95
ns
tt
Any
4.5 V
8
15
22
19
ns
t
6 V
6
13
19
16
operating characteristics, T
A
= 25
C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
No load
40
pF
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D DECEMBER 1982 REVISED AUGUST 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
50%
50%
10%
10%
90%
90%
VCC
0 V
tr
tf
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%
50%
10%
10%
90%
90%
VCC
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
50%
tPLH
tPHL
50%
50%
10%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-Phase
Output
Test
Point
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT
NOTES: A. CL includes probe and test-fixture capacitance.
B. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR
1 MHz, ZO = 50
, tr = 6 ns, tf = 6 ns.
C. The outputs are measured one at a time with one input transition per measurement.
D. tPLH and tPHL are the same as tpd.
Figure 1. Load Circuit and Voltage Waveforms