M74HC238 [STMICROELECTRONICS]
3 TO 8 LINE DECODER; 3-8线解码器
| 型号： | M74HC238 |
| 厂家： | 
ST |
| 描述： | 3 TO 8 LINE DECODER |
| 文件： | 总10页 (文件大小：249K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
B1R
(Plastic Package)
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
VCC (OPR) = 2 V TO 6 V
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS238
ORDER CODES :
M54HC238F1R
M74HC238B1R
M74HC238M1R
M74HC238C1R
PIN CONNECTIONS (top view)
DESCRIPTION
The M54/74HC238 is a high speed CMOS 3 to 8 line
decoder fabricated insilicongate C2MOStechnology.
It has the same high speed performance of LSTTL
combined with true CMOSlow power consumption. If
the device is enabled, 3 binary select inputs (A, B and
C)determine whichoneof outputs willgohigh. Enable
input G1 is held ”Low” or either G2A or G2B is held
”High” decoding function is inhibited and all the 8 out-
putsgo low. Three enable inputs are provided to ease
cascade connection and application of this address
decoder in memory systems.
Allinputs are equipped with protection circuits against
static discharge and transient excess voltage.
NC =
No Internal
Connection
October 1993
1/10
M54/M74HC238
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3
4, 5
SYMBOL
NAME AND FUNCTION
A, B, C
Data Inputs
G2A G2B
Enable Input (Active
LOW)
6
G1
Data Enable Input
(Active HIGH)
15, 14, 13,
12, 11, 10, 9,
7
Y0 to Y7
Outputs
8
GND
VCC
Ground (0V)
16
Positive Supply Voltage
IEC LOGIC SYMBOLS
TRUTH TABLE
INPUTS
OUTPUS
SELECTED
OUTPUT
ENABLE
SELECT
G2B G2A
G1
L
C
X
X
X
L
B
X
X
X
L
A
X
X
X
L
Y0
L
Y1
L
Y2
L
Y3
L
Y4
L
Y5
L
Y6
Y7
L
X
X
H
L
L
L
L
L
L
L
L
X
H
X
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
L
NONE
NONE
NONE
Y0
X
L
L
L
L
L
L
L
X
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
H
L
H
L
L
L
L
L
L
Y1
L
H
H
L
L
H
L
L
L
L
L
Y2
L
H
L
L
L
H
L
L
L
L
Y3
H
H
H
H
L
L
L
H
L
L
L
Y4
L
H
L
L
L
L
L
H
L
L
Y5
H
H
L
L
L
L
L
L
Y6
H
L
L
L
L
L
L
H
Y7
X: Don’t Care
2/10
M54/M74HC238
LOGIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
VI
Parameter
Value
Unit
Supply Voltage
-0.5 to +7
V
DC Input Voltage
-0.5 to VCC + 0.5
-0.5 to VCC + 0.5
± 20
V
V
VO
DC Output Voltage
IIK
DC Input Diode Current
DC Output Diode Current
DC Output Source Sink Current Per Output Pin
mA
mA
mA
mA
mW
oC
IOK
± 20
IO
± 25
ICC or IGND DC VCC or Ground Current
± 50
PD
Tstg
TL
Power Dissipation
500 (*)
Storage Temperature
-65 to +150
Lead Temperature (10 sec)
300
oC
Absolute MaximumRatingsare those values beyond whichdamage tothe 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
VCC
VI
Parameter
Value
2 to 6
Unit
V
Supply Voltage
Input Voltage
Output Voltage
0 to VCC
0 to VCC
V
VO
V
Top
Operating Temperature: M54HC Series
M74HC Series
-55 to +125
-40 to +85
oC
oC
tr, tf
Input Rise and Fall Time
VCC = 2 V
VCC = 4.5 V
VCC = 6 V
0 to 1000
0 to 500
0 to 400
ns
DC SPECIFICATIONS
Test Conditions
VCC
Value
-40 to 85 oC -55 to 125 oC
74HC 54HC
TA = 25 oC
54HC and 74HC
Symbol
Parameter
Unit
(V)
Min. Typ. Max. Min. Max. Min. Max.
VIH
High Level Input
Voltage
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
1.5
3.15
4.2
1.5
3.15
4.2
1.5
3.15
4.2
V
V
VIL
Low Level Input
Voltage
0.5
1.35
1.8
0.5
1.35
1.8
0.5
1.35
1.8
VOH
High Level
Output Voltage
1.9
4.4
5.9
2.0
4.5
6.0
1.9
4.4
1.9
4.4
VI =
VIH
or
IO=-20 µA
V
V
5.9
5.9
VIL
IO=-4.0 mA 4.18 4.31
4.13
5.63
4.10
5.60
IO=-5.2 mA 5.68
5.8
0.0
0.0
0.0
VOL
Low Level Output 2.0
Voltage
0.1
0.1
0.1
0.1
0.1
0.1
0.1
VI =
VIH
or
IO= 20 µA
4.5
6.0
4.5
6.0
0.1
0.1
VIL
IO= 4.0 mA
IO= 5.2 mA
0.17 0.26
0.18 0.26
±0.1
0.33
0.33
±1
0.40
0.40
±1
II
Input Leakage
6.0
VI = VCC or GND
µA
µA
Current
ICC
Quiescent Supply 6.0 VI = VCC or GND
Current
4
40
80
4/10
M54/M74HC238
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Test Conditions
Value
-40 to 85 oC -55 to 125 oC
74HC 54HC
TA = 25 oC
54HC and 74HC
Symbol
Parameter
Unit
VCC
(V)
Min. Typ. Max. Min. Max. Min. Max.
tTLH
tTHL
Output Transition
Time
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
30
8
75
15
95
19
110
22
ns
ns
ns
ns
7
13
16
19
tPLH
tPHL
Propagation
Delay Time
(A, B, C - Y)
50
17
15
50
17
15
50
17
15
5
150
30
190
38
225
45
26
32
38
tPLH
tPHL
Propagation
Delay Time
(G1 - Y)
150
30
190
38
225
45
26
32
38
tPLH
tPHL
Propagation
Delay Time
(G2 - Y)
150
30
190
38
225
45
26
32
38
CIN
Input Capacitance
10
10
10
pF
pF
CPD (*) Power Dissipation
Capacitance
53
(*) CPD isdefined 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 followingequation. 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
inch
TYP.
DIM.
MIN.
0.51
0.77
TYP.
MAX.
MIN.
0.020
0.030
MAX.
a1
B
b
1.65
0.065
0.5
0.020
0.010
b1
D
E
e
0.25
20
0.787
8.5
2.54
17.78
0.335
0.100
0.700
e3
F
7.1
5.1
0.280
0.201
I
L
3.3
0.130
Z
1.27
0.050
P001C
6/10
M54/M74HC238
Ceramic DIP16/1 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
20
MIN.
MAX.
0.787
0.276
A
B
7
D
E
3.3
0.130
0.700
0.38
0.015
e3
F
17.78
2.29
0.4
2.79
0.55
1.52
0.31
1.27
10.3
8.05
5.08
0.090
0.016
0.046
0.009
0.020
0.110
0.022
0.060
0.012
0.050
0.406
0.317
0.200
G
H
L
1.17
0.22
0.51
M
N
P
7.8
0.307
Q
P053D
7/10
M54/M74HC238
SO16 (Narrow) MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
1.75
0.2
MIN.
MAX.
0.068
0.007
0.064
0.018
0.010
A
a1
a2
b
0.1
0.004
1.65
0.46
0.25
0.35
0.19
0.013
0.007
b1
C
0.5
0.019
c1
D
45° (typ.)
9.8
5.8
10
0.385
0.228
0.393
0.244
E
6.2
e
1.27
8.89
0.050
0.350
e3
F
3.8
4.6
0.5
4.0
5.3
0.149
0.181
0.019
0.157
0.208
0.050
0.024
G
L
1.27
0.62
M
S
8° (max.)
P013H
8/10
M54/M74HC238
PLCC20 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
9.78
8.89
4.2
TYP.
MAX.
10.03
9.04
MIN.
0.385
0.350
0.165
MAX.
0.395
0.356
0.180
A
B
D
4.57
d1
d2
E
2.54
0.56
0.100
0.022
7.37
8.38
0.290
0.330
0.004
e
1.27
5.08
0.38
0.050
0.200
0.015
e3
F
G
0.101
M
M1
1.27
1.14
0.050
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. Specificationsmentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronicsproductsare notauthorized foruse ascritical componentsin 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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10/10
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