STMICROELECTRONICS M74HC238B1R

M54HC238
M74HC238
3 TO 8 LINE DECODER
.
.
.
.
.
.
.
.
HIGH SPEED
tPD = 14 ns (TYP.) AT VCC = 5 V
LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
SYMMETRICAL OUTPUT IMPEDANCE
|IOH| = IOL = 4 mA (MIN.)
BALANCED PROPAGATION DELAYS
tPLH = tPHL
WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS238
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HC238F1R
M74HC238M1R
M74HC238B1R
M74HC238C1R
PIN CONNECTIONS (top view)
DESCRIPTION
The M54/74HC238 is a high speed CMOS 3 to 8 line
2
decoder fabricated in silicon gate C MOS technology.
It has the same high speed performance of LSTTL
combined with true CMOS low power consumption. If
the device is enabled, 3 binary select inputs (A, B and
C) determine which one of outputs will go high. Enable
input G1 is held ”Low” or either G2A or G2B is held
”High” decoding function is inhibited and all the 8 outputs go low. Three enable inputs are provided to ease
cascade connection and application of this address
decoder in memory systems.
All inputs are equipped with protection circuits against
static discharge and transient excess voltage.
October 1993
NC =
No Internal
Connection
1/10
M54/M74HC238
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1, 2, 3
4, 5
A, B, C
G2A G2B
Data Inputs
Enable Input (Active
LOW)
6
G1
15, 14, 13,
12, 11, 10, 9,
7
Y0 to Y7
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
Data Enable Input
(Active HIGH)
Outputs
IEC LOGIC SYMBOLS
TRUTH TABLE
INPUTS
ENABLE
OUTPUS
SELECT
SELECTED
OUTPUT
G2B
X
G2A
X
G1
L
C
X
B
X
A
X
Y0
L
Y1
L
Y2
L
Y3
L
Y4
L
Y5
L
Y6
L
Y7
L
NONE
X
H
X
X
X
X
L
L
L
L
L
L
L
L
NONE
H
L
X
L
X
H
X
L
X
L
X
L
L
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
NONE
Y0
L
L
H
L
L
H
L
H
L
L
L
L
L
L
Y1
L
L
L
L
H
H
L
L
H
H
L
H
L
L
L
L
H
L
L
H
L
L
L
L
L
L
L
L
Y2
Y3
L
L
H
H
L
L
L
L
L
L
H
L
L
L
Y4
L
L
L
L
H
H
H
H
L
H
H
L
L
L
L
L
L
L
L
L
L
L
H
L
L
H
L
L
Y5
Y6
L
L
H
H
H
H
L
L
L
L
L
L
L
H
Y7
X: Don’t Care
2/10
M54/M74HC238
LOGIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
-0.5 to +7
V
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
V
V
DC Input Diode Current
± 20
mA
DC Output Diode Current
DC Output Source Sink Current Per Output Pin
± 20
± 25
mA
mA
VCC
Supply Voltage
VI
VO
DC Input Voltage
DC Output Voltage
IIK
IOK
IO
ICC or IGND
DC VCC or Ground Current
PD
Power Dissipation
Tstg
Storage Temperature
TL
Lead Temperature (10 sec)
± 50
mA
500 (*)
mW
-65 to +150
o
C
300
o
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition isnotimplied.
(*) 500 mW: ≅ 65 oC derate to 300 mW by 10mW/oC: 65 oC to 85 oC
3/10
M54/M74HC238
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC
VI
Supply Voltage
Input Voltage
VO
Output Voltage
Top
Operating Temperature: M54HC Series
M74HC Series
Input Rise and Fall Time
tr, tf
Value
Unit
2 to 6
0 to VCC
V
V
0 to VCC
V
o
-55 to +125
-40 to +85
0 to 1000
VCC = 2 V
VCC = 4.5 V
0 to 500
VCC = 6 V
0 to 400
C
C
ns
o
DC SPECIFICATIONS
Test Conditions
Symbol
VIH
V IL
V OH
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level
Output Voltage
VCC
(V)
2.0
Min.
1.5
4.5
3.15
6.0
2.0
4.2
Low Level Output
Voltage
6.0
2.0
ICC
4/10
Quiescent Supply
Current
Min.
1.5
Max.
3.15
Min.
1.5
4.2
4.2
0.5
0.5
1.35
1.35
1.35
1.8
2.0
1.9
1.9
4.4
4.4
4.4
6.0
5.9
5.9
4.5
4.18
4.31
4.13
4.10
6.0
IO=-5.2 mA
5.68
5.8
6.0
6.0
5.63
V
1.8
1.9
4.5
2.0
4.5
V
0.5
1.8
Unit
Max.
3.15
5.9
4.5
6.0
Input Leakage
Current
Max.
-40 to 85 oC -55 to 125 oC
74HC
54HC
VI =
IO=-20 µA
VIH
or
V IL IO=-4.0 mA
4.5
6.0
II
Typ.
4.5
6.0
VOL
Value
TA = 25 oC
54HC and 74HC
V
5.60
0.0
0.0
0.1
0.1
0.1
0.1
0.1
0.1
0.0
0.1
0.1
0.1
0.17
0.18
0.26
0.26
0.33
0.33
0.40
0.40
VI = VCC or GND
±0.1
±1
±1
µA
VI = VCC or GND
4
40
80
µA
VI =
IO= 20 µA
VIH
or
V IL IO= 4.0 mA
IO= 5.2 mA
V
M54/M74HC238
AC ELECTRICAL CHARACTERISTICS (C L = 50 pF, Input t r = tf = 6 ns)
Test Conditions
Symbol
Parameter
VCC
(V)
tTLH
tTHL
Output Transition
Time
tPLH
tPHL
Propagation
Delay Time
(A, B, C - Y)
tPLH
tPHL
Propagation
Delay Time
(G1 - Y)
tPLH
tPHL
Propagation
Delay Time
(G2 - Y)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
CIN
CPD (*)
Input Capacitance
Power Dissipation
Capacitance
TA = 25 oC
54HC and 74HC
Min. Typ. Max.
30
75
8
15
7
13
50
150
17
30
15
26
50
150
17
30
15
26
50
150
17
30
15
26
5
10
53
Value
-40 to 85 oC -55 to 125 oC
74HC
54HC
Min. Max. Min. Max.
95
110
19
22
16
19
190
225
38
45
32
38
190
225
38
45
32
38
190
225
38
45
32
38
10
10
Unit
ns
ns
ns
ns
pF
pF
(*) CPD 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. ICC(opr) = CPD •VCC •fIN + ICC
SWITCHING CHARACTERISTICS TEST
WAVEFORM
TEST CIRCUIT ICC (Opr.)
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHING CHARACTERISTICSTEST.
5/10
M54/M74HC238
Plastic DIP16 (0.25) MECHANICAL DATA
mm
DIM.
MIN.
a1
0.51
B
0.77
TYP.
inch
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.030
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
17.78
0.700
F
7.1
0.280
I
5.1
0.201
L
Z
3.3
0.130
1.27
0.050
P001C
6/10
M54/M74HC238
Ceramic DIP16/1 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
20
0.787
B
7
0.276
D
E
3.3
0.130
0.38
e3
0.015
17.78
0.700
F
2.29
2.79
0.090
0.110
G
0.4
0.55
0.016
0.022
H
1.17
1.52
0.046
0.060
L
0.22
0.31
0.009
0.012
M
0.51
1.27
0.020
0.050
N
P
Q
10.3
7.8
8.05
5.08
0.406
0.307
0.317
0.200
P053D
7/10
M54/M74HC238
SO16 (Narrow) MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.068
0.2
a2
MAX.
0.004
0.007
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45° (typ.)
D
9.8
E
5.8
10
0.385
6.2
0.228
0.393
0.244
e
1.27
0.050
e3
8.89
0.350
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
S
0.62
0.024
8° (max.)
P013H
8/10
M54/M74HC238
PLCC20 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
inch
MAX.
MIN.
TYP.
MAX.
A
9.78
10.03
0.385
0.395
B
8.89
9.04
0.350
0.356
D
4.2
4.57
0.165
0.180
d1
2.54
0.100
d2
0.56
0.022
E
7.37
8.38
0.290
0.330
e
1.27
0.050
e3
5.08
0.200
F
0.38
0.015
G
0.101
0.004
M
1.27
0.050
M1
1.14
0.045
P027A
9/10
M54/M74HC238
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
 1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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