Page 1
MM54HC521/MM74HC521
8-Bit Magnitude Comparator (Equality Detector)
General Description
This equality detector utilizes advanced silicon-gate CMOS
technology to compare bit for bit two 8-bit words and indicates whether or not they are equal. The P
cates equality when it is low. A single active low enable is
provided to facilitate cascading of several packages and enable comparison of words greater than 8 bits.
This device is useful in memory block decoding applications, where memory block enable signals must be generated from computer address information.
The comparator’s output can drive 10 low power Schottky
equivalent loads. This comparator is functionally and pin
e
Q output indi-
Connection and Logic Diagrams
Dual-In-Line Package
compatible to the 54LS688/74LS688 and the 54HC688/
74HC688. All inputs are protected from damage due to static discharge by diodes to V
and ground.
CC
Features
Y
Typical propagation delay: 20 ns
Y
Wide power supply range: 2–6V
Y
Low quiescent current: 80 mA (74 Series)
Y
Large output current: 4 mA (74 Series)
Y
Identical to ’HC688
MM54HC521/MM74HC521 8-Bit Magnitude Comparator (Equality Detector)
January 1988
Top View
Order Number MM54HC521 or MM74HC521
TL/F/6128– 1
Truth Table
Inputs
Data
P,Q G PeQ
PeQL L
l
P
k
P
XHH
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.
Enable
TL/F/6128– 2
QL H
QL H
TL/F/6128
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Absolute Maximum Ratings (Notes 1 and 2)
Operating Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (V
CC
)
DC Input Voltage (VIN)
DC Output Voltage (V
OUT
)
Clamp Diode Current (IIK,IOK)
DC Output Current, per pin (I
OUT
)
DC VCCor GND Current, per pin (ICC)
Storage Temperature Range (T
STG
b
b
)
b
0.5 toa7.0V
1.5 to V
CC
0.5 to V
CC
g
g
b
g
65§Ctoa150§C
a
1.5V
a
0.5V
20 mA
25 mA
50 mA
Supply Voltage (V
)26V
CC
DC Input or Output Voltage 0 V
(V
IN,VOUT
)
Operating Temp. Range (TA)
MM74HC
MM54HC
Input Rise or Fall Times
e
V
2.0V(tr,tf) 1000 ns
CC
e
V
4.5V 500 ns
CC
e
V
6.0V 400 ns
CC
Power Dissipation (PD)
(Note 3) 600 mW
S.O. Package only 500 mW
Lead Temperature (T
(Soldering 10 seconds) 260
)
L
C
§
DC Electrical Characteristics (Note 4)
Symbol Parameter Conditions V
CC
A
e
T
25§C
Typ Guaranteed Limits
V
IH
Minimum High Level 2.0V 1.5 1.5 1.5 V
Input Voltage 4.5V 3.15 3.15 3.15 V
6.0V 4.2 4.2 4.2 V
V
IL
Maximum Low Level 2.0V 0.5 0.5 0.5 V
Input Voltage** 4.5V 1.35 1.35 1.35 V
6.0V 1.8 1.8 1.8 V
V
OH
Minimum High Level V
Output Voltage
e
VIHor V
l
I
IN
OUT
IL
s
20 mA 2.0V 2.0 1.9 1.9 1.9 V
l
4.5V 4.5 4.4 4.4 4.4 V
6.0V 6.0 5.9 5.9 5.9 V
e
V
VIHor V
IN
I
l
OUT
I
l
OUT
l
I
IN
OUT
e
V
OL
Maximum Low Level V
Output Voltage
IL
s
4.0 mA 4.5V 4.2 3.98 3.84 3.7 V
l
s
5.2 mA 6.0V 5.7 5.48 5.34 5.2 V
l
VIHor V
IL
s
20 mA 2.0V 0 0.1 0.1 0.1 V
l
4.5V 0 0.1 0.1 0.1 V
6.0V 0 0.1 0.1 0.1 V
e
V
VIHor V
IN
I
l
OUT
I
l
OUT
I
IN
I
CC
Note 1: Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Note 2: Unless otherwise specified all voltages are referenced to ground.
Note 3: Power Dissipation temperature derating Ð plastic ‘‘N’’ package:
Note 4: For a power supply of 5V
designing with this supply. Worst case V
I
**V
Maximum Input V
Current
Maximum Quiescent V
Supply Current I
, and IOZ) occur for CMOS at the higher voltage and so the 6.0V values should be used.
CC
limits are currently tested at 20% of VCC. The above VILspecification (30% of VCC) will be implemented no later than Q1, CY’89.
IL
e
IN
e
IN
OUT
g
10% the worst case output voltages (VOH, and VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when
and VILoccur at V
IH
IL
s
4.0 mA 4.5V 0.2 0.26 0.33 0.4 V
l
s
5.2 mA 6.0V 0.2 0.26 0.33 0.4 V
l
VCCor GND 6.0V
g
0.1
VCCor GND 6.0V 8.0 80 160 mA
e
0 mA
b
12 mW/§C from 65§Cto85§C; ceramic ‘‘J’’ package:b12 mW/§C from 100§Cto125§C.
e
5.5V and 4.5V respectively. (The VIHvalue at 5.5V is 3.85V.) The worst case leakage current (IIN,
CC
74HC 54HC
eb
T
40 to 85§CT
A
g
1.0
Min Max Units
V
§
§
Units
b
b
40
55
A
eb
55 to 125§C
g
CC
a
85
a
125
1.0 mA
C
C
2
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AC Electrical Characteristics
e
5V, T
e
A
V
CC
25§C, C
e
L
15 pF, t
e
e
t
6ns
r
f
Symbol Parameter Conditions Typ
t
PHL,tPLH
t
PLH,tPHL
Maximum Propagation 21 30 ns
Delay, any P or Q to Output
Maximum Propagation 14 20 ns
Delay, Enable to any Output
AC Electrical Characteristics
e
V
2.0V to 6.0V, C
CC
Symbol Parameter Conditions V
t
PHL,tPLH
Maximum Propagation 2.0V 60 175 220 263 ns
Delay, P or Q to 4.5V 22 35 44 53 ns
Output 6.0V 19 30 38 45 ns
t
PHL,tPLH
Maximum Propagation 2.0V 45 120 150 180 ns
Delay, Enable to 4.5V 15 24 30 36 ns
Output 6.0V 13 20 25 30 ns
t
THL,tTLH
C
PD
C
IN
Note 5: CPDdetermines the no load dynamic power consumption, P
Maximum Output Rise 2.0V 30 75 95 110 ns
and Fall Time 4.5V 8 15 19 22 ns
Power Dissipation 45 pF
Capacitance (Note 5)
Maximum Input 5 10 10 10 pF
Capacitance
e
L
50 pF, t
e
e
t
6 ns (unless otherwise specified)
r
f
CC
6.0V 7 13 16 19 ns
e
D
e
T
A
Guaranteed
Limit
25§C
Units
74HC 54HC
eb
T
40 to 85§CT
A
Typ Guaranteed Limits
2
CPDV
faICCVCC, and the no load dynamic current consumption, I
CC
eb
A
55 to 125§C
e
CPDVCCfaICC.
S
Units
3
Page 4
Physical Dimensions inches (millimeters)
Order Number MM54HC521J or MM74HC521J
NS Package J20A
Order Number MM74HC521N
NS Package N20A
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
MM54HC521/MM74HC521 8-Bit Magnitude Comparator (Equality Detector)
1. Life support devices or systems are devices or 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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Corporation Europe Hong Kong Ltd. Japan Ltd.
1111 West Bardin Road Fax: (
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Tel: 1(800) 272-9959 Deutsch Tel: (
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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