74ACT157B [STMICROELECTRONICS]
QUAD 2 CHANNEL MULTIPLEXER; QUAD 2通道多路复用器
| 型号： | 74ACT157B |
| 厂家： | 
ST |
| 描述： | QUAD 2 CHANNEL MULTIPLEXER |
| 文件： | 总8页 (文件大小：77K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74ACT157
QUAD 2 CHANNEL MULTIPLEXER
PRELIMINARY DATA
■
■
HIGH SPEED: tPD = 5.5 ns (TYP.) at VCC = 5V
LOW POWER DISSIPATION:
ICC = 8 µA (MAX.) at TA = 25 oC
COMPATIBLE WITH TTL OUTPUTS
■
■
■
■
■
■
■
V
IH = 2V (MIN), V = 0.8V (MAX)
IL
50Ω TRANSMISSION LINE DRIVING
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL =24 mA (MIN)
BALANCED PROPAGATION DELAYS:
tPLH tPHL
OPERATING VOLTAGE RANGE:
B
M
(Plastic Package)
(Micro Package)
ORDER CODES :
74ACT157B
74ACT157M
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 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.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
VCC (OPR) = 4.5V to 5.5V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 157
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The ACT157 is an high-speed CMOS QUAD
2-CHANNEL MULTIPLEXER fabricated with
sub-micron silicon gate and double-layer metal
wiring C2MOS technology. It is ideal for low
power applications maintaining high speed
operation similar to equivalent Bipolar Schottky
TTL.
It consists of four 2-input digital multiplexers with
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/8
May 1997
74ACT157
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
SYMBOL NAME AND FUNCTION
SELECT
1A to 4A
Common Data Select Input
2,5, 11, 14
Data Inputs From
Source A
3,6, 10, 13
1B to 4B
Data Inputs From
Source B
4,7, 9, 12
1Y to 4Y
Multiplexer Outputs
15
8
STROBE Strobe Input
GND
VCC
Ground (0V)
16
Positive Supply Voltage
TRUTH TABLE
INPUT
OUTPUT
STROBE
SELECT
A
X
L
B
X
X
X
L
Y
L
H
L
L
L
L
X
L
L
L
H
X
X
H
L
H
H
H
H
X:”H” or ”L”
ABSOLUTE MAXIMUM RATING
Symbol
Parameter
Value
-0.5 to +7
Unit
VCC
VI
Supply Voltage
V
V
DC Input Voltage
-0.5 to VCC +0.5
-0.5 to VCC +0.5
± 20
VO
IIK
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
V
mA
mA
mA
mA
oC
oC
IOK
IO
± 20
± 50
ICC or IGND DC VCC or Ground Current
± 200
Tstg
TL
Storage Temperature
-65 to +150
300
Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
Parameter
Value
4.5 to 5.5
0 to VCC
0 to VCC
-40 to +85
8
Unit
V
Supply Voltage
VI
Input Voltage
V
VO
Output Voltage
V
oC
Top
Operating Temperature:
dt/dv
Input Rise and Fall Time VCC = 4.5 to 5.5V (note 1)
ns/V
1) VIN from0.8 V to2.0 V
2/8
74ACT157
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
VCC
(V)
-40 to 85 oC
VIH
High Level Input Voltage
Low Level Input Voltage
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
5.5
5.5
5.5
VO =0.1 V or
2.0
2.0
1.5
1.5
2.0
2.0
V
V
V
VCC -0.1 V
V
IL
VO =0.1 V or
VCC -0.1 V
1.5
0.8
0.8
0.8
0.8
1.5
VOH
High Level Output
Voltage
IO=-50 µA
4.4
5.4
4.49
5.49
4.4
5.4
VI(*)
IH or
VIL
=
IO=-50 µA
IO=-24 mA
IO=-24 mA
IO=50 µA
V
3.86
4.86
3.76
4.76
VOL
Low Level Output
Voltage
0.001
0.001
0.1
0.1
0.1
0.1
0.44
0.44
±1
VI(*)
IH or
VIL
=
V
IO=50 mA
IO=24mA
IO=24mA
V
0.36
0.36
±0.1
II
Input Leakage Current
Max ICC /Input
VI =VCC or GND
µA
mA
µA
ICCT
ICC
V = VCC -2.1 V
I
0.6
1.5
80
Quiescent Supply
Current
VI =VCC or GND
8
IOLD
IOHD
Dynamic Output Current
(note 1, 2)
5.5
VOLD =1.65 V max
VOHD = 3.85 V min
75
mA
mA
-75
1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω.
(*) All outputs loaded.
3/8
74ACT157
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf =3 ns)
Symbol
Parameter
Test Condition
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
VCC
(V)
-40 to 85 oC
(*)
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Propagation Delay Time
SELECT to Y
5.0
1.5
1.5
1.5
5.5
5.0
4.0
9.0
8.5
7.0
1.0
1.0
1.0
10.0
ns
ns
ns
(*)
Propagation Delay Time
STROBE to Y
5.0
9.0
(*)
Propagation Delay Time
A, B to Y
5.0
8.5
(*) Voltage range is 5V ± 0.5V
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Unit
VCC
-40 to 85 oC
(V)
Min. Typ. Max. Min. Max.
CIN
Input Capacitance
4
5.0
5.0
pF
pF
CPD
Power Dissipation
TDB
Capacitance (note 1)
1) 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 operating current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN +ICC/n (per circuit)
TEST CIRCUIT
4/8
74ACT157
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS
WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS
5/8
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
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
6/8
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
7/8
74ACT157
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 underany 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 productsare notauthorized for use as criticalcomponents in life supportdevices or systems withoutexpress
written approval of SGS-THOMSON Microelectonics.
1997 SGS-THOMSON Microelectronics - Printedin Italy - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia- Brazil - Canada - China - France - Germany - Hong Kong - Italy- Japan- Korea - Malaysia- Malta- Morocco - TheNetherlands -
Singapore - Spain- Sweden- Switzerland - Taiwan - Thailand - United Kingdom - U.S.A
.
8/8
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