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INTEGRATED CIRCUITS
74LV688
8-bit magnitude comparator
Product specification
Supersedes data of 1997 May 15
IC24 Data Handbook
1998 Jun 23
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Philips Semiconductors Product specification
74L V6888-bit magnitude comparator
FEA TURES
•Wide operating voltage: 1.0 to 5.5V
•Optimized for low voltage applications: 1.0V to 3.6V
•Accepts TTL input levels between V
•Typical V
T
amb
•Typical V
T
amb
(output ground bounce) < 0.8V at VCC = 3.3V,
OLP
= 25°C
(output VOH undershoot) > 2V at VCC = 3.3V,
OHV
=25°C
= 2.7V and VCC = 3.6V
CC
DESCRIPTION
The 74LV688 is a high-speed Si-gate CMOS device, pin compatible
with the 74HC/HCT688
The 74LV688 is an 8-bit magnitude comparator. It performs
comparisons of two 8-bit binary or BCD words. The output provides
P = Q
(equal-to).
•Compare two 8-bit words
•Output capability: standard
•I
category: MSI
CC
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS TYPICAL UNIT
t
PHL/tPLH
C
I
C
PD
Propagation delay Pn, Qn to P=Q
Input capacitance 3.5 pF
Power dissipation capacitance per gate VI = GND to V
NOTE:
is used to determine the dynamic power dissipation (PD in W):
1. C
PD
= CPD × V
P
D
f
= input frequency in MHz; CL = output load capacity in pF;
i
= output frequency in MHz; VCC = supply voltage in V;
f
o
× V
(C
L
2
× fi + (CL × V
CC
2
× fo) = sum of outputs.
CC
2
× fo) where:
CC
CL = 15pF
VCC = 3.3V
CC
17 ns
1
22 pF
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #
20-Pin Plastic DIL –40°C to +125°C 74LV688 N 74LV688 N SOT146-1
20-Pin Plastic SO –40°C to +125°C 74LV688 D 74LV688 D SOT163-1
20-Pin Plastic SSOP Type II –40°C to +125°C 74LV688 DB 74LV688 DB SOT339-1
20-Pin Plastic TSSOP Type I –40°C to +125°C 74LV688 PW 74LV688PW DH SOT360-1
PIN CONFIGURATION
1
2
P0
3
Q0
4
P1
5
Q1
6
P2
7
Q2
8
P3
9
Q3
GND
20E
19
18
17
16
15
14
13
12
1110
SY00054
V
CC
P = Q
Q7
P7
Q6
P6
Q5
P5
Q4
P4
PIN DESCRIPTION
PIN NO. SYMBOL FUNCTION
1 E Enable input (active LOW)
2, 4, 6, 8, 11,
13, 15, 17
3, 5, 7, 9, 12,
14, 16, 18
10 GND Ground (0V)
19 P=Q Equal to output
20 V
P0 to P7 Word inputs
Q0 to Q7 Word inputs
CC
Positive Supply Voltage
1998 Jun 23 853-1878 19618
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Philips Semiconductors Product specification
74LV6888-bit magnitude comparator
LOGIC SYMBOL
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
P0
P1
P2
P3
P4
P5
P6
P7
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
LOGIC SYMBOL (IEEE/IEC)
1
2
4
6
8
11
13
15
17
3
5
7
9
12
14
16
18
G1
0
7
0
7
E
1
P
(P = Q) 1
Q
SY00055
SY00056
LOGIC DIAGRAM
P7
Q7
P6
Q6
19P = Q
19
P5
Q5
P4
Q4
P3
Q3
P2
Q2
P1
Q1
P0
Q0
E
P = Q
SY00057
FUNCTION TABLE
INPUTS OUTPUT
DATA
Pn, Qn
P = Q L L
X H H
P > Q L H
P < Q L H
NOTES:
H = HIGH voltage level
L = LOW voltage level
X = Don’t care
ENABLE
E
P = Q
1998 Jun 23
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Philips Semiconductors Product specification
SYMBOL
PARAMETER
CONDITIONS
MIN.TYP.MAX.UNIT
74LV6888-bit magnitude comparator
ABSOLUTE MAXIMUM RATINGS
1, 2
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).
SYMBOL
V
CC
I
IK
I
OK
I
O
± I
GND,
± I
CC
T
stg
P
tot
DC supply voltage –0.5 +7.0 V
DC input diode current VI < –0.5 V or V1 > VCC + 0.5V – ± 20 mA
DC output diode current VO < –0.5 V or V0 > VCC + 0.5V – ± 50 mA
DC output source or sink current
– standard outputs
DC VCC or GND current for types with
– standard outputs
Storage temperature range –65 +150 °C
power dissipation per package
– plastic DIL
– plastic mini-pack (SO)
– plastic medium-shrink SO (SSOP and TSSOP)
PARAMETER CONDITIONS MIN MAX UNIT
–0.5V < VO < VCC +0.5V ± 25
± 50
for temperature range: –40 to +125°C
above +70°C derate linearly with 12 mW/K
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K
–
–
–
750
500
400
mW
NOTES:
1. Stresses beyond those listed 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 .
2. The performance capability of a high–performance integrated circuit in conjunction with its thermal environment can create junction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150°C.
3. The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings are observed.
mA
mA
RECOMMENDED OPERATING CONDITIONS
V
V
V
T
amb
tr, t
∆t/∆v)
(
NOTE:
1. The LV is guaranteed to function down to V
DC supply voltage see note 1 1.0 3.3 5.5 V
CC
DC Input voltage 0 – V
I
DC output voltage 0 – V
O
Operating ambient temperature range in
free–air
f
Input rise and fall times
= 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.
CC
See DC and AC characteristics –40
–40
VCC = 1.0V to 2.0V
VCC = 2.0V to 2.7V
VCC = 2.7V to 3.6V
V
= 3.6V to 5.5V
CC
CC
CC
–
–
–
–
–
–
+85
+125
500
200
100
50
V
V
°C
ns/V
1998 Jun 23
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Philips Semiconductors Product specification
V
V
V
V
HIGH l
t
voltage all out uts
V
V
g
LOW l
t
voltage all out uts
V
V
g
74LV6888-bit magnitude comparator
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions. V oltages are referenced to GND (ground = 0V).
LIMITS
SYMBOL P ARAMETER TEST CONDITIONS
VCC = 1.2V 0.9 0.9
IH
HIGH level Input
voltage
VCC = 2.0V 1.4 1.4
VCC = 2.7 to 3.6V 2.0 2.0
VCC = 4.5 to 5.5V 0.7V
VCC = 1.2V 0.3 0.3
IL
LOW level Input
voltage
VCC = 2.0V 0.6 0.6
VCC = 2.7 to 3.6V 0.8 0.8
VCC = 4.5 to 5.5 0.3V
VCC = 1.2V; VI = VIH or V
VCC = 2.0V; VI = VIH or V
evel outpu
;
VCC = 2.7V; VI = VIH or V
p
VCC = 3.0V; VI = VIH or V
OH
HIGH level output
voltage;
STANDARD
outputs
VCC = 4.5V; VI = VIH or V
VCC = 3.0V; VI = VIH or V
VCC = 4.5V; VI = VIH or V
VCC = 1.2V; VI = VIH or V
VCC = 2.0V; VI = VIH or V
evel outpu
;
VCC = 2.7V; VI = VIH or V
p
VCC = 3.0V; VI = VIH or V
OL
LOW level output
voltage;
STANDARD
outputs
Input leakage
I
I
current
CC
Quiescent supply
current; MSI
I
VCC = 4.5V; VI = VIH or V
VCC = 3.0V; VI = VIH or V
VCC = 4.5V; VI = VIH or V
VCC = 5.5V; VI = VCC or GND 1.0 1.0 µA
VCC = 5.5V; VI = VCC or GND; IO = 0 20.0 160 µA
IL;
IL;
IL;
IL;
IL;
IL;
IL;
IL;
IL;
IL;
IL;
IL;
IL;
IL;
Additional
CC
quiescent supply
current
VCC = 2.7V to 3.6V; VI = VCC – 0.6V 500 850 µA
∆I
NOTE:
1. All typical values are measured at T
amb
= 25°C.
–IO = 100µA 1.2
–IO = 100µA 1.8 2.0 1.8
–IO = 100µA 2.5 2.7 2.5
–IO = 100µA 2.8 3.0 2.8
–IO = 100µA 4.3 4.5 4.3
–IO = 6mA 2.40 2.82 2.20
–IO = 12mA 3.60 4.20 3.50
IO = 100µA 0
IO = 100µA 0 0.2 0.2
IO = 100µA 0 0.2 0.2
IO = 100µA 0 0.2 0.2
IO = 100µA 0 0.2 0.2
IO = 6mA 0.25 0.40 0.50
IO = 12mA 0.35 0.55 0.65
-40°C to +85°C -40°C to +125°C
MIN TYP
CC
1
MAX MIN MAX
0.7V
CC
CC
0.3V
UNIT
CC
1998 Jun 23
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Philips Semiconductors Product specification
CONDITION
P
P
n
Q
n
P=Q
P
E to P=Q
74LV6888-bit magnitude comparator
AC CHARACTERISTICS
GND = 0V; tr = tf = 2.5ns; CL = 50pF; RL = 1KΩ
LIMITS
SYMBOL PARAMETER WAVEFORM
t
PHL/tPLH
t
PHL/tPLH
ropagation delay
,
to
=
ropagation delay
=
2
1
NOTES:
1. Unless otherwise stated, all typical values are at T
2. Typical value measured at V
3. Typical value measured at V
CC
CC
= 3.3V.
= 5.0V.
amb
VCC(V) MIN TYP
1.2 100 – –
2.0 28 45 57
2.7 20 32 40
3.0 to 3.6 16
4.5 to 5.5 11
1.2 50 – –
2.0 17 29 38
2.7 13 21 27
3.0 to 3.6 10
4.5 to 5.5 7
= 25°C.
–40 to +85 °C –40 to +125 °C
1
MAX MIN MAX
2
2
2
2
26 33
18 22
17 22
12 15
UNIT
ns
ns
AC WAVEFORMS
VM = 1.5V at VCC w 2.7V; VM = 0.5 VCC at VCC t 2.7V.
VOL and VOH are the typical output voltage drop that occur with the
output load.
V
I
E INPUT
GND
V
OH
P = Q OUTPUT
V
OL
Waveform 1. Propagation delays from the enable input (E) to
Pn, Qn INPUT
P = Q OUTPUT
V
M
t
PLH
V
M
the equal-to output (P = Q
V
M
t
PHL
V
M
).
t
PHL
V
SV00195
M
t
PLH
V
M
TEST CIRCUIT
V
cc
V
PULSE
GENERATOR
l
D.U.T.
R
T
Test Circuit for Outputs
DEFINITIONS
RL = Load resistor
CL = Load capacitance includes jig and probe capacitiance
RT = Termination resistance should be equal to Z
TEST
t
PLH/tPHL
V
CC
< 2.7V
2.7–3.6V
≥ 4.5 V V
Waveform 3. Load circuitry for switching times
V
V
2.7V
CC
V
I
CC
O
50pF
C
L
of pulse generators.
OUT
RL= 1k
SV00902
SV00194
Waveform 2. Propagation delays from the inputs (Pn, Qn) to
1998 Jun 23
the equal-to output (P = Q
).
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Philips Semiconductors Product specification
74LV6888-bit magnitude comparator
APPLICATION INFORMATION
Two or more “688” 8-bit magnitude comparators may be cascaded to compare binary or BCD numbers of more than 8 bits.
A
n
B
n
688
8 MSB
ENABLE
INPUT
n-1
A = BA
B
n-1
688A
ENABLE
INPUT
=
BA
A
0
B
0
688
8 LSB
ENABLE
INPUT
=
B
OUTPUT
SV00196
Waveform 4. Binary or BCD comparator
1998 Jun 23
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Philips Semiconductors Product specification
74LV6888-bit magnitude comparator
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
1998 Jun 23
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Philips Semiconductors Product specification
74LV6888-bit magnitude comparator
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
1998 Jun 23
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Philips Semiconductors Product specification
74LV6888-bit magnitude comparator
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1
1998 Jun 23
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Philips Semiconductors Product specification
74LV6888-bit magnitude comparator
TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm SOT360-1
1998 Jun 23
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Philips Semiconductors Product specification
74LV6888-bit magnitude comparator
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
LIFE SUPPORT APPLICA TIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
print code Date of release: 05-96
Document order number: 9397-750-04456
1998 Jun 23
12
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