SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D – DECEMBER 1982 – REVISED AUGUST 2003
D
D
D
Wide Operating Voltage Range of 2 V to 6 V
High-Current Outputs Drive Up To 10
LSTTL Loads
Low Power Consumption, 80-µA Max I
CC
SN54HC688 . . . J OR W PACKAGE
SN74HC688 . . . DW, N, OR PW PACKAGE
(TOP VIEW)
D
D
D
D
Typical t
pd
= 14 ns
±4-mA
Output Drive at 5 V
Low Input Current of 1
µA
Max
Compare Two 8-Bit Words
SN54HC688 . . . FK PACKAGE
(TOP VIEW)
OE
P0
Q0
P1
Q1
P2
Q2
P3
Q3
GND
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
P=Q
Q7
P7
Q6
P6
Q5
P5
Q4
P4
Q0
P0
OE
V
CC
P=Q
P1
Q1
P2
Q2
P3
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
Q7
P7
Q6
P6
Q5
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
PDIP – N
–40°C 85°C
–40 C to 85 C
SOIC – DW
TSSOP – PW
CDIP – J
–55°C 125°C
–55 C to 125 C
CFP – W
LCCC – FK
PACKAGE†
Tube of 20
Tube of 25
Reel of 2000
Tube of 2000
Reel of 250
Tube of 20
Tube of 85
Tube of 55
ORDERABLE
PART NUMBER
SN74HC688N
SN74HC688DW
SN74HC688DWR
SN74HC688PWR
SN74HC688PWT
SNJ54HC688J
SNJ54HC688W
SNJ54HC688FK
TOP-SIDE
MARKING
SN74HC688N
HC688
HC688
SNJ54HC688J
SNJ54HC688W
SNJ54HC688FK
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
DATA
P, Q
P=Q
P>Q
P<Q
X
OE
L
X
X
H
OUTPUT
P=Q
L
H
H
H
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.
Copyright
2003, Texas Instruments Incorporated
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.
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.
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Q3
GND
P4
Q4
P5
1
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D – DECEMBER 1982 – REVISED AUGUST 2003
logic diagram (positive logic)
OE
P0
Q0
P1
Q1
P2
Q2
P3
Q3
P4
Q4
P5
Q5
P6
Q6
P7
Q7
1
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
P=Q
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,
θ
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.
2
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SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D – DECEMBER 1982 – REVISED AUGUST 2003
recommended operating conditions (see Note 3)
SN54HC688
MIN
VCC
VIH
Supply voltage
High-level input voltage
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 2 V
VIL
VI
VO
tt
Low-level input voltage
Input voltage
Output voltage
Input transition (rise and fall) time
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
VCC = 4.5 V
VCC = 6 V
0
0
2
1.5
3.15
4.2
0.5
1.35
1.8
VCC
VCC
1000
500
400
0
0
NOM
5
MAX
6
SN74HC688
MIN
2
1.5
3.15
4.2
0.5
1.35
1.8
VCC
VCC
1000
500
400
ns
V
V
V
V
NOM
5
MAX
6
UNIT
V
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
2V
IOH = –20
µA
A
VOH
VI = VIH or VIL
IOH = –4 mA
IOH = –5.2 mA
IOL = 20
µA
A
VOL
VI = VIH or VIL
IOL = 4 mA
IOL = 5.2 mA
II
ICC
Ci
VI = VCC or 0
VI = VCC or 0,
IO = 0
4.5 V
6V
4.5 V
6V
2V
4.5 V
6V
4.5 V
6V
6V
6V
2 V to 6 V
3
TA = 25°C
MIN
TYP
MAX
1.9
4.4
5.9
3.98
5.48
1.998
4.499
5.999
4.3
5.8
0.002
0.001
0.001
0.17
0.15
±0.1
0.1
0.1
0.1
0.26
0.26
±100
8
10
SN54HC688
MIN
1.9
4.4
5.9
3.7
5.2
0.1
0.1
0.1
0.4
0.4
±1000
160
10
MAX
SN74HC688
MIN
1.9
4.4
5.9
3.84
5.34
0.1
0.1
0.1
0.33
0.33
±1000
80
10
nA
µA
pF
V
V
MAX
UNIT
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3
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D – DECEMBER 1982 – REVISED AUGUST 2003
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF
(unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC
2V
P or Q
tpd
OE
P=Q
P=Q
4.5 V
6V
2V
4.5 V
6V
2V
tt
Any
4.5 V
6V
TA = 25°C
MIN
TYP
MAX
113
30
24
66
16
14
38
8
6
210
42
36
120
24
20
75
15
13
SN54HC688
MIN
MAX
313
63
53
179
36
30
110
22
19
SN74HC688
MIN
MAX
265
53
45
151
30
26
95
19
16
ns
ns
UNIT
operating characteristics, T
A
= 25°C
PARAMETER
Cpd
Power dissipation capacitance
TEST CONDITIONS
No load
TYP
40
UNIT
pF
4
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DALLAS, TEXAS 75265
SN54HC688, SN74HC688
8-BIT IDENTITY COMPARATORS
SCLS010D – DECEMBER 1982 – REVISED AUGUST 2003
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
Test
Point
CL = 50 pF
(see Note A)
In-Phase
Output
Input
VCC
50%
tPLH
50%
10%
tPHL
Out-of-Phase
Output
90%
50%
10%
tf
90%
tr
Input
50%
10%
90%
90%
VCC
50%
10% 0 V
tf
tPLH
50%
10%
90%
tr
50%
0V
tPHL
90%
VOH
50%
10%
VOL
tf
VOH
VOL
LOAD CIRCUIT
tr
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
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
Ω,
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
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