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BCD TO DECIMAL DECODER
M54HC42
M74HC42
. HIGH SPEED
t PD = 13 ns (TYP.) AT V CC =5V
BCD TO DECIMAL DECODER
. HIGH NOISE IMMUNITY
V NIH =V NIL =28%V CC (MIN.)
I CC =4
A (MAX.) AT T A =25
°
C
. OUTPUT DRIVE CAPABILITY
. SYMMETRICAL OUTPUT IMPEDANCE
|I OH |=I OL = 4 mA (MIN.)
10 LSTTL LOADS
B1R
(Plastic Package)
F1R
(Ceramic Package)
. BALANCED PROPAGATION DELAYS
. WIDE OPERATING VOLTAGE RANGE
V CC (OPR) = 2 V TO 6 V
t PLH =t PHL
. PIN AND FUNCTION COMPATIBLE
M1R
(Micro Package)
C1R
(Chip Carrier)
WITH 54/74LS42
ORDER CODES :
M54HC42F1R
M74HC42M1R
M74HC42B1R
M74HC42C1R
DESCRIPTION
The M54/74HC42 is a high speed CMOS BCD-TO-
DECIMAL DECODER fabricated in silicon gate
C 2 MOS technology.
It has the same high speed performance of LSTTL
combined with true CMOS low power consumption.
A BCD code applied to the four inputs A-D selects
one of ten decimal outputs Y0-Y9, which goes low
to fifteen gives a high level at all outputs. This device
also can be used as a 3-to-8 LINE DECODER, when
the D input is assigned as a disable input. This de-
vice is useful for code conversion, address decod-
ing, memory selection, demultiplexing, or readout
decoding.
All inputs are equipped with protection circuits against
static discharge and transient excess voltage.
PIN CONNECTIONS (top view)
INPUT AND OUTPUT EQUIVALENT CIRCUIT
NC =
No Internal
Connection
December 1992
1/10
. LOW POWER DISSIPATION
m
337930508.002.png
M54/M74HC42
PIN DESCRIPTION
IEC LOGIC SYMBOL
PIN No
SYMBOL
NAME AND FUNCTION
15, 14, 13,
12
A, B, C, D Data Inputs
1, 2, 3, 4,
5, 6, 7, 9,
10, 11
Y 0 to Y 9
Multiplexer Outputs
8
GND
Ground (0V)
16
V CC
Positive Supply Voltage
LOGIC DIAGRAM
2/10
337930508.003.png
M54/M74HC42
FUNCTIONAL TABLE
CODE No.
BCD INPUTS
DECIMAL OUTPUTS
DCBA 0
1
2
3
4
5
6
7
8
9
0
L
L
L
L
L
HHHHHHHHH
1
L
L
L
HHL
HHHHHHHH
2
L
L
HL
HHL
HHHHHHH
3
L
L
HHHHHL
HHHHHH
4
L
HL
L
HHHHL
HHHHH
5
L
HL
HHHHHHL
HHHH
6
L
HHL
HHHHHHL
HHH
7
L
HHHHHHHHHHL
HH
8
HL
L
L
HHHHHHHHL
H
9
HL
L
HHHHHHHHHH L
10
HL
HL
HHHHHHHHHH
11
HL
HHHHHHHHHHHH
12
HHL
L
HHHHHHHHHH
13
HHL
HHHHHHHHHHH
14
HHHL
HHHHHHHHHH
15
HHHHHHHHHHHHHH
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V CC
Supply Voltage
-0.5 to +7
V
V I
DC Input Voltage
-0.5 to V CC + 0.5
V
V O
DC Output Voltage
-0.5 to V CC + 0.5
V
I IK
DC Input Diode Current
±
20
mA
I OK
DC Output Diode Current
±
20
mA
I O
DC Output Source Sink Current Per Output Pin
±
25
mA
I CC or I GND DC V CC or Ground Current
±
50
mA
P D
Power Dissipation
500 (*)
mW
T stg
Storage Temperature
-65 to +150
o C
o C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
(*) 500 mW:
Lead Temperature (10 sec)
300
@
65 o C derate to 300 mW by 10mW/ o C: 65 o Cto85 o C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V CC
Supply Voltage
2 to 6
V
V I
Input Voltage
0 to V CC
V
V O
Output Voltage
0 to V CC
V
T op
Operating Temperature: M54HC Series
M74HC Series
-55 to +125
-40 to +85
o C
o
C
t r ,t f
Input Rise and Fall Time
V CC = 2 V
0 to 1000
ns
V CC = 4.5 V
0 to 500
V CC = 6 V
0 to 400
3/10
T L
337930508.004.png
M54/M74HC42
DC SPECIFICATIONS
Test Conditions
Value
Symbol
Parameter
V CC
(V)
-55 to 125 o C
54HC
Min. Typ. Max. Min. Max. Min. Max.
-40 to 85 o C
74HC
Unit
V IH
High Level Input
Voltage
2.0
1.5
1.5
1.5
V
4.5
3.15
3.15
3.15
6.0
4.2
4.2
4.2
V IL
Low Level Input
Voltage
2.0
0.5
0.5
0.5
4.5
1.35
1.35
1.35
V
6.0
1.8
1.8
1.8
V OH
High Level
Output Voltage
2.0
V I =
V IH
or
V IL
1.9
2.0
1.9
1.9
4.5
I O =-20
m
A
4.4
4.5
4.4
4.4
V
6.0
5.9
6.0
5.9
5.9
4.5
I O =-4.0 mA 4.18 4.31
4.13
4.10
6.0
I O =-5.2 mA 5.68
5.8
5.63
5.60
V OL
Low Level Output
Voltage
2.0
V I =
V IH
or
V IL
0.0
0.1
0.1
0.1
I O =20
m
A
4.5
0.0
0.1
0.1
0.1
V
6.0
0.0
0.1
0.1
0.1
4.5
I O = 4.0 mA
0.17 0.26
0.33
0.40
6.0
I O = 5.2 mA
0.18 0.26
0.33
0.40
I I
Input Leakage
Current
6.0
V I =V CC or GND
±
0.1
±
1
±
1
m
A
I CC
Quiescent Supply
Current
6.0 V I =V CC or GND
4
40
80
m
A
AC ELECTRICAL CHARACTERISTICS (C L =50pF,Inputt r =t f =6ns)
Test Conditions
Value
Symbol
Parameter
V CC
(V)
-55 to 125 o C
54HC
Min. Typ. Max. Min. Max. Min. Max.
-40 to 85 o C
74HC
Unit
t TLH
t THL
Output Transition
Time
2.0
30
75
95
110
ns
4.5
8
15
19
22
6.0
7
13
16
19
t PLH
t PHL
Propagation
Delay Time
2.0
64
130
165
195
4.5
16
26
33
39
ns
6.0
14
22
28
33
C IN
Input Capacitance
5
10
10
10
pF
C PD (*) Power Dissipation
Capacitance
60
pF
(*) C PD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
(Refer to Test Circuit). Average operting current can be obtained by the following equation. I CC (opr) = C PD
•
V CC
•
f IN +I CC
4/10
T A =25 o C
54HC and 74HC
T A =25 o C
54HC and 74HC
337930508.005.png
M54/M74HC42
SWITCHING CHARACTERISTICS TEST WAVEFORM
TEST CIRCUIT I CC (Opr.)
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF SWITCHING CHARACTERISTIC TEST
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337930508.001.png

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