M74HCT138TTR [STMICROELECTRONICS]
3 TO 8 LINE DECODER (INVERTING); 3至8线译码器（反相）
| 型号： | M74HCT138TTR |
| 厂家： | 
ST |
| 描述： | 3 TO 8 LINE DECODER (INVERTING) |
| 文件： | 总9页 (文件大小：280K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M74HCT138
3 TO 8 LINE DECODER (INVERTING)
■
■
■
■
■
■
HIGH SPEED:
= 16ns (TYP.) at V = 4.5V
t
PD
CC
LOW POWER DISSIPATION:
= 4µA(MAX.) at T =25°C
I
CC
A
COMPATIBLE WITH TTL OUTPUTS :
= 2V (MIN.) V = 0.8V (MAX)
V
IH
IL
DIP
SOP
TSSOP
SYMMETRICAL OUTPUT IMPEDANCE:
|I | = I = 4mA (MIN)
OH
OL
BALANCED PROPAGATION DELAYS:
t
t
ORDER CODES
PACKAGE
PLH
PHL
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 138
TUBE
T & R
DIP
SOP
M74HCT138B1R
M74HCT138M1R M74HCT138RM13TR
M74HCT138TTR
DESCRIPTION
The M74HCT138 is an high speed CMOS 3 TO 8
LINE DECODER fabricated with silicon gate
TSSOP
2
C MOS technology.
enable inputs are provided to ease cascade
connection and application of address decoders
for memory systems.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
If the device is enabled, 3 binary select inputs (A,
B, and C) determine which one of the outputs will
go low. If enable input G1 is held low or either G2A
or G2B is held high, the decoding function is
inhibited and all the 8 outputs go high. Three
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 2001
1/9
M74HCT138
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
A, B, C
NAME AND FUNCTION
1, 2, 3
4, 5
6
Address Inputs
G2A, G2B Enable Inputs
G1
Enable Input
Data Outputs
9, 10, 11, 12,
13, 14, 15,
7
Y0 to Y7
8
GND
Ground (0V)
16
V
Positive Supply Voltage
CC
TRUTH TABLE
INPUTS
OUTPUTS
ENABLE
G2A
SELECT
B
G2B
G1
C
A
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
X
X
H
L
L
L
L
L
L
L
L
X
H
X
L
L
L
L
L
L
L
L
L
X
X
X
L
X
X
X
L
X
X
X
L
H
H
H
L
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
H
H
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
L
X
X
H
H
H
H
H
H
H
H
L
L
H
L
H
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
H
H
H
X : Don’t Care
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
2/9
M74HCT138
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
Supply Voltage
-0.5 to +7
V
V
CC
V
DC Input Voltage
-0.5 to V + 0.5
I
CC
V
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
-0.5 to V + 0.5
V
O
CC
I
± 20
± 20
mA
mA
mA
mA
mW
°C
IK
I
OK
I
± 25
O
I
or I
DC V
or Ground Current
CC
± 50
CC
GND
P
Power Dissipation
500(*)
-65 to +150
300
D
T
Storage Temperature
Lead Temperature (10 sec)
stg
T
°C
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
Supply Voltage
4.5 to 5.5
V
V
CC
V
Input Voltage
0 to V
I
CC
V
Output Voltage
0 to V
V
O
CC
T
Operating Temperature
-55 to 125
0 to 500
°C
ns
op
t , t
Input Rise and Fall Time (V = 4.5 to 5.5V)
CC
r
f
DC SPECIFICATIONS
Test Condition
Value
-40 to 85°C -55 to 125°C Unit
T
= 25°C
Symbol
Parameter
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
V
High Level Input
Voltage
4.5
to
IH
2.0
2.0
2.0
V
5.5
V
Low Level Input
Voltage
4.5
to
IL
0.8
0.1
0.8
0.8
V
V
5.5
V
High Level Output
Voltage
I =-20 µA
4.4
4.5
4.4
4.4
OH
O
4.5
I =-4.0 mA
4.18 4.31
0.0
4.13
4.10
O
V
Low Level Output
Voltage
I =20 µA
0.1
0.1
OL
O
4.5
5.5
V
I =4.0 mA
0.17 0.26
0.33
0.40
O
I
Input Leakage
Current
I
V = V
or GND
± 0.1
± 1
± 1
µA
I
CC
CC
I
Quiescent Supply
Current
CC
V = V
or GND
5.5
5.5
4
40
80
µA
I
∆ I
Additional Worst
Case Supply
Current
Per Input pin
V = 0.5V or
2.0
2.9
3.0
mA
CC
I
V = 2.4V
I
Other Inputs at
V
or GND
CC
I
= 0
O
3/9
M74HCT138
AC ELECTRICAL CHARACTERISTICS (C = 50 pF, Input t = t = 6ns)
L
r
f
Test Condition
Value
T
= 25°C
Symbol
Parameter
-40 to 85°C -55 to 125°C Unit
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
t
t
Output Transition
Time
TLH THL
4.5
4.5
4.5
4.5
8
15
30
30
30
19
38
38
38
22
45
45
45
ns
ns
ns
ns
t
t
t
t
Propagation Delay
Time (A, B, C - Y)
PLH PHL
17
16
19
t
Propagation Delay
Time (G1 - Y)
PLH PHL
t
Propagation Delay
Time (G2 - Y)
PLH PHL
CAPACITIVE CHARACTERISTICS
Test Condition
Value
-40 to 85°C -55 to 125°C Unit
T
= 25°C
Symbol
Parameter
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
C
Input Capacitance
5
10
10
10
pF
pF
IN
C
Power Dissipation
Capacitance (note
1)
PD
52
1) C is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
PD
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
= C x V x f + I
CC(opr)
PD CC IN CC
TEST CIRCUIT
C
R
= 50pF or equivalent (includes jig and probe capacitance)
L
T
= Z
of pulse generator (typically 50Ω)
OUT
4/9
M74HCT138
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING OUTPUTS (f=1MHz; 50% duty cycle)
WAVEFORM2:PROPAGATIONDELAYSFORNON-INVERTINGOUTPUTS( f = 1 M H z ; 5 0 % d u t y c y c l e )
5/9
M74HCT138
Plastic DIP-16 (0.25) MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
0.51
0.77
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
6/9
M74HCT138
SO-16 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
0.003
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.)
PO13H
7/9
M74HCT138
TSSOP16 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.2
MIN.
MAX.
0.047
0.006
0.041
0.012
0.0089
0.201
0.260
0.176
A
A1
A2
b
0.05
0.8
0.15
1.05
0.30
0.20
5.1
0.002
0.031
0.007
0.004
0.193
0.244
0.169
0.004
0.039
1
0.19
0.09
4.9
c
D
5
6.4
0.197
0.252
E
6.2
6.6
E1
e
4.3
4.4
4.48
0.173
0.65 BSC
0.0256 BSC
K
0°
8°
0°
8°
L
0.45
0.60
0.75
0.018
0.024
0.030
A2
A
K
L
b
e
A1
c
E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
8/9
M74HCT138
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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© 2001 STMicroelectronics - Printed in Italy - All Rights Reserved
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9/9
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