74ACT157MTR [STMICROELECTRONICS]
QUAD 2 CHANNEL MULTIPLEXER; QUAD 2通道多路复用器
| 型号： | 74ACT157MTR |
| 厂家： | 
ST |
| 描述： | QUAD 2 CHANNEL MULTIPLEXER |
| 文件： | 总10页 (文件大小：277K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74ACT157
QUAD 2 CHANNEL MULTIPLEXER
■
■
HIGH SPEED: t = 5.5 ns (TYP.) at V = 5V
PD CC
LOW POWER DISSIPATION:
I
= 4µA(MAX.) at T =25°C
CC
A
■
■
■
■
■
■
■
COMPATIBLE WITH TTL OUTPUTS
= 2V (MIN.), V = 0.8V (MAX.)
50Ω TRANSMISSION LINE DRIVING
V
IH
IL
DIP
SOP
TSSOP
T & R
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|I | = I = 24mA (MIN)
OH
OL
BALANCED PROPAGATION DELAYS:
ORDER CODES
PACKAGE
t
t
PLH
PHL
TUBE
OPERATING VOLTAGE RANGE:
(OPR) = 4.5V to 5.5V
DIP
SOP
74ACT157B
74ACT157M
V
CC
74ACT157MTR
74ACT157TTR
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 157
IMPROVED LATCH-UP IMMUNITY
TSSOP
the outputs become low. The SELECT decoding
determines whether the A or B inputs get routed to
their corresponding Y outputs.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
DESCRIPTION
The 74ACT157 is an advanced high-speed CMOS
QUAD 2-CHANNEL MULTIPLEXER fabricated
with sub-micron silicon gate and double-layer
2
metal wiring C MOS tecnology.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
It consists of four 2-input digital multiplexer with
common SELECT and STROBE inputs. It is a
non-inverting multiplexer. When the STROBE
input is held high selection of data is inhibit and all
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 2001
1/10
74ACT157
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1
SELECT
1A to 4A
1B to 4B
1Y to 4Y
Common Data Select
Inputs
2, 5, 11, 14
3, 6, 10, 13
Data Inputs From Source
A
Data Inputs From Source
B
4, 7, 9, 12
Multiplexer Outputs
15
8
STROBE Strobe Input
GND
Ground (0V)
16
V
Positive Supply Voltage
CC
TRUTH TABLE
INPUTS
OUTPUT
Y
STROBE
SELECT
A
B
H
L
L
L
L
X
L
X
L
X
X
X
L
L
L
L
H
X
X
H
L
H
H
H
H
X : Don’t Care
LOGIC DIAGRAM
2/10
74ACT157
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
°C
°C
IK
I
OK
I
± 50
O
I
or I
T
DC V
or Ground Current
CC
± 200
CC
GND
Storage Temperature
-65 to +150
300
stg
T
Lead Temperature (10 sec)
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
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
8
°C
ns/V
op
Input Rise and Fall Time V = 4.5 to 5.5V (note 1)
dt/dv
CC
1) V from 0.8V to 2.0V
IN
3/10
74ACT157
DC SPECIFICATIONS
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.
V
High Level Input
Voltage
4.5
5.5
4.5
5.5
4.5
V
= 0.1 V or
O
2.0
2.0
1.5
1.5
2.0
2.0
2.0
2.0
IH
V
-0.1V
V
V
CC
V
Low Level Input
Voltage
V = 0.1 V or
O
1.5
0.8
0.8
0.8
0.8
0.8
0.8
IL
V
-0.1V
1.5
CC
V
High Level Output
Voltage
I =-50 µA
4.4
5.4
4.49
4.4
5.4
4.4
5.4
3.7
4.7
OH
O
I =-50 µA
5.5
4.5
5.5
4.5
5.5
4.5
5.5
5.49
O
I =-24 mA
3.86
4.86
3.76
4.76
O
I =-24 mA
O
V
Low Level Output
Voltage
I =50 µA
0.001 0.1
0.001 0.1
0.36
0.1
0.1
0.1
0.1
0.5
0.5
OL
O
V
I =50 µA
O
I =24 mA
0.44
0.44
O
I =24 mA
0.36
O
I
Input Leakage Cur-
rent
I
V = V
or GND
CC
5.5
5.5
5.5
± 0.1
± 1
1.5
40
± 1
1.6
80
µA
mA
µA
I
I
Max I /Input
V = V - 2.1V
0.6
CCT
CC
I
CC
I
Quiescent Supply
Current
CC
V = V
or GND
CC
4
I
I
V
= 1.65 V max
= 3.85 V min
75
50
mA
mA
OLD
OLD
Dynamic Output
Current (note 1, 2)
5.5
I
V
OHD
-75
-50
OHD
1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on trasmission lines with impedances as low as 50Ω
AC ELECTRICAL CHARACTERISTICS (C = 50 pF, R = 500 Ω, Input t = t = 3ns)
L
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
t
t
Propagation Delay
Time SELECT to Y
PLH PHL
5.0
5.0
5.0
1.5
1.5
1.5
5.5
6.5
6.5
9.0
8.5
9.0
1.5
1.5
1.5
10.0
9.0
1.5
1.5
1.5
11.3
11.5
10.8
ns
ns
ns
(*)
(*)
t
Propagation Delay
Time STROBE to Y
PLH PHL
t
Propagation Delay
Time A, B to Y
PLH PHL
8.5
(*) Voltage range is 5.0V ± 0.5V
4/10
74ACT157
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
5.0
5.5
pF
pF
IN
C
Power Dissipation
Capacitance (note
1)
PD
f
= 10MHz
5.0
37
IN
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 /n (per circuit)
PD CC IN CC
CC(opr)
TEST CIRCUIT
C
R
R
= 50pF or equivalent (includes jig and probe capacitance)
L
L
T
= R = 500Ω or equivalent
1
= Z
of pulse generator (typically 50Ω)
OUT
5/10
74ACT157
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS (f=1MHz; 50% duty cycle)
WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS (f=1MHz; 50% duty
cycle)
6/10
74ACT157
Plastic DIP-16 (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
0.335
0.100
0.700
e3
F
17.78
7.1
5.1
0.280
0.201
I
L
3.3
0.130
Z
1.27
0.050
P001C
7/10
74ACT157
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
0.004
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
74ACT157
TSSOP16 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
1.1
MIN.
MAX.
0.433
0.006
0.374
0.0118
0.0079
0.201
0.256
0.176
A
A1
A2
b
0.05
0.85
0.19
0.09
4.9
0.10
0.9
0.15
0.95
0.30
0.20
5.1
0.002
0.335
0.0075
0.0035
0.193
0.246
0.169
0.004
0.354
c
D
5
6.4
0.197
0.252
E
6.25
4.3
6.5
E1
e
4.4
4.48
0.173
0.65 BSC
4o
0.0256 BSC
4o
K
0o
8o
0o
8o
L
0.50
0.60
0.70
0.020
0.024
0.028
A2
A
K
L
b
e
A1
c
E
D
E1
PIN 1 IDENTIFICATION
1
9/10
74ACT157
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.
© The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics - Printed in Italy - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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10/10
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