M74HC42
SO-16
Features
High speed: t pd
= 14 ns (typ.) at V
CC
= 6 V
Low power dissipation:
I
CC
= 4 A (max.) at T
A
= 25 °C
High noise immunity:
V
NIH
= V
NIL
= 28% V
CC
(min.)
Symmetrical output impedance:
|I
OH
| = I
OL
= 4 mA (min.)
Balanced propagation delays: t
PLH
t
PHL
Wide operating voltage range:
V
CC (OPR)
= 2 to 6 V
Pin and function compatible with 74 series 42
BCD to decimal decoder
Datasheet
-
production data
Description
The M74HC42 is a high-speed CMOS BCD to decimal decoder manufactured with silicon gate
C 2 MOS technology.
A BCD code applied to the four inputs A-D selects one of ten decimal outputs Y
0
to Y
9
. All outputs are HIGH when binary codes greater than nine are applied to the inputs.This device can also be used as a 1 of 8 decoder when the D input is assigned as an inhibit input. This device is useful for code conversion, address decoding, memory selection, demultiplexing or readout decoding.
All inputs are equipped with protection circuits against static discharge and transient excess voltage.
Table 1. Order code
Order code Package
M74HC42RM13TR SOP
Obsolete Product(s) - Obsolete Product(s)
May 2013
This is information on a product in full production.
DocID1973 Rev 2 1/12 www.st.com
12
3
4
1
2
5
Contents
Contents
M74HC42
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Obsolete Product(s) - Obsolete Product(s)
2/12 DocID1973 Rev 2
M74HC42 Pin connections
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Figure 1. Pin connections and IEC logic symbols
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9&&
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Pin number
15, 14, 13, 12
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
8
16
Table 2. Pin descriptions
Symbol
A, B, C, D
Y
0
to Y
9
GND
VCC
Name and function
Data inputs
Multiplexer outputs
Ground (0 V)
Positive supply voltage
Figure 2. Input and output equivalent circuit
Obsolete Product(s) - Obsolete Product(s)
DocID1973 Rev 2 3/12
Pin connections M74HC42
11
12
13
9
10
7
8
14
15
5
6
3
4
0
1
2
Code no
BCD inputs
C
L
H
H
H
H
L
L
H
L
H
H
L
H
L
L
L
B
H
L
L
H
H
L
H
H
L
L
H
H
L
L
L
H
D
H
H
H
H
H
H
H
L
H
L
L
L
L
L
L
L
A
H
L
H
L
H
H
L
H
L
H
L
H
L
L
H
L
H
H
H
H
H
H
H
H
H
H
H
Y
1
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
Y
2
H
H
H
H
L
Table 3. Functional table
Decimal outputs
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
Y
0
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
Y
3
H
H
H
H
H
H
H
H
H
H
H
H
Y
4
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
Y
5
H
H
H
H
H
H
H
H
H
H
H
L
Y
6
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
Y
8
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
Y
7
H
H
H
L
H
H
H
H
H
H
H
H
Y
9
H
H
H
H
H
Figure 3. Logic diagram
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<
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6
$0
4/12 DocID1973 Rev 2
M74HC42
2
Absolute maximum ratings and operating conditions
Absolute maximum ratings and operating conditions
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Symbol
Table 4. Absolute maximum ratings
Parameter
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
or
I
GND
Supply voltage
DC input voltage
DC output voltage
DC input diode current
DC output diode current
DC output current
DC V
CC
or ground current
P
D
T stg
Power dissipation
Storage temperature
T
L
Lead temperature (10 sec.)
1. 500 mW at 65 C. Derate to 300 mW by 10 mW/ C from 65 C to 85 C.
Value
-0.5 to +7
-0.5 to V
CC
+ 0.5
-0.5 to V
CC
+ 0.5
20
20
25
50
500
(1)
-65 to +150
300 mA mW
°C
°C
Unit
V
V
V mA mA mA
Symbol
V
CC
V
I
V
O
T op
Supply voltage
Input voltage
Output voltage
Operating temperature t r
, t f
Table 5. Recommended operating conditions
Input rise and fall time
Parameter
V
CC
= 2 V
V
CC
= 4.5 V
V
CC
= 6 V
Value
2 to 6
0 to V
CC
0 to V
CC
-55 to 125
0 to 1000
0 to 500
0 to 400
Unit ns ns ns
V
°C
V
V
Obsolete Product(s) - Obsolete Product(s)
DocID1973 Rev 2 5/12
Absolute maximum ratings and operating conditions M74HC42
Table 6. DC specifications
Test condition Value
Symbol
V
V
I
V
V
I
IH
OH
OL
I
IL
CC
Parameter
High level input voltage
Low level input voltage
High level output voltage
Low level output voltage
Input leakage current
Quiescent supply current
2.0
4.5
6.0
4.5
6.0
6.0
4.5
6.0
4.5
6.0
2.0
4.5
2.0
4.5
6.0
2.0
V
CC
(V)
6.0
I
O
= -20 A
I
O
= -20 A
I
O
= -20 A
I
O
= -4.0 mA
I
O
= -5.2 mA
I
O
= 20 A
I
O
= 20 A
I
O
= 20 A
I
O
= 4.0 mA
I
O
= 5.2 mA
V
I
= V
CC
or GND
T
A
= 25 °C -40 to 85 °C -55 to 125 °C
Min.
Typ. Max. Min. Max.
Min.
Max.
Unit
1.5
3.15
4.2
0.5
1.35
1.8
1.9
2.0
4.4
4.5
5.9
6.0
4.18
4.31
5.68
5.8
0.0
0.1
0.0
0.1
0.0
0.1
0.17
0.26
0.18
0.26
1.5
3.15
4.2
1.9
4.4
5.9
4.13
5.63
0.5
1.35
1.8
0.1
0.1
0.1
0.33
0.33
1.5
3.15
4.2
1.9
4.4
5.9
4.10
5.60
0.5
1.35
1.8
0.1
0.1
0.1
0.40
0.40
V
V
V
V
0.1
1 1 A
6.0
V
I
= V
CC
or GND 4 40 80 A
Obsolete Product(s) - Obsolete Product(s)
6/12 DocID1973 Rev 2
M74HC42 Absolute maximum ratings and operating conditions
Symbol t
TLH t
THL t
PLH t
PHL
Table 7. AC electrical characteristics (C
L
= 50 pF, input t r
= t f
= 6 ns)
Test condition Value
Parameter
Output transition time
Propagation delay time
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
T
A
= 25 °C -40 to 85 °C -55 to 125 °C
Min.
Typ. Max. Min. Max.
Min.
Max.
30
8
7
64
16
14
75
15
13
130
26
22
95
19
16
165
33
28
110
22
19
195
39
33
Unit ns ns
Table 8. Capacitive characteristics
Test condition Value
Symbol Parameter
V
CC
(V)
T
A
= 25 °C -40 to 85 °C -55 to 125 °C
Min.
Typ. Max. Min. Max.
Min.
Max.
Unit
C
C
IN
PD
Input capacitance
Power dissipation capacitance
(1)
5.0
5.0
5
60
10 10 10
1. C
I
PD
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
.
Figure 4 ). The average operating current can be obtained by the following equation:
pF pF
Figure 4. Test circuit
Obsolete Product(s) - Obsolete Product(s)
1. C
L
= 50 pF or equivalent (includes jig and probe capacitance). R
T
= Z
OUT
of pulse generator (typically 50 ).
6&
DocID1973 Rev 2 7/12
Absolute maximum ratings and operating conditions M74HC42
Figure 5. Waveform - propagation delay time (f = 1 MHz, 50% duty cycle)
QV
QV
V
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W
7+/
W
7/+
V
2872)3+$6(
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W
3+/
W
7/+
W
3/+
W
7+/
V
,13+$6(
287387
V
V
W
3/+
W
3+/
6
Obsolete Product(s) - Obsolete Product(s)
8/12 DocID1973 Rev 2
M74HC42 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK ® packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com
.
ECOPACK is an ST trademark.
Obsolete Product(s) - Obsolete Product(s)
DocID1973 Rev 2 9/12
Package information
Figure 6. SO-16 package outline
M74HC42
Table 9. SO-16 package mechanical data
Dimensions
Symbol Millimeters Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
A
A1
A2 b
L k e h ccc
0.10
1.25
0.31
1.75
0.25
0.51
0.020
c 0.17
0.25
0.007
0.010
D 9.80
9.90
10.00
0.386
0.390
0.394
Obsolete Product(s) - Obsolete Product(s)
E 5.80
6.00
6.20
0.228
0.236
0.244
E1 3.80
3.90
4.00
0.150
0.154
0.157
1.27
0.050
0.25
0.40
0
0.50
1.27
8
0.10
0.004
0.049
0.012
0.010
0.016
0.069
0.010
0.020
0.050
0.004
10/12 DocID1973 Rev 2
M74HC42 Ordering information
Order code
M74HC42RM13TR
Table 10. Order code
Package
SO-16
Packaging
Tape and reel
Date
01-Jul-2001
15-May-2013
Table 11. Document revision history
Revision Changes
1
2
Initial release.
Removed: “Obsolete Product” watermark.
Updated
Description .
Removed M74HC42B1R and M74HC42TTR device in Table 1 and
Table 10
.
Removed DIP and TSSOP package from Table 1
,
Table 10 , and
Chapter 4
.
Removed note below Figure 3 .
Updated package information in
Chapter 4 .
Minor corrections throughout document.
Obsolete Product(s) - Obsolete Product(s)
DocID1973 Rev 2 11/12
M74HC42
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