74VHCT157AMTR [STMICROELECTRONICS]
QUAD 2 CHANNEL MULTIPLEXER; QUAD 2通道多路复用器
| 型号： | 74VHCT157AMTR |
| 厂家： | 
ST |
| 描述： | QUAD 2 CHANNEL MULTIPLEXER |
| 文件： | 总9页 (文件大小：67K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74VHCT157A
QUAD 2 CHANNEL MULTIPLEXER
PRELIMINARY DATA
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■
HIGH SPEED:tPD =6.2ns (TYP.) atVCC = 5V
LOW POWER DISSIPATION:
ICC =4 µA (MAX.) at TA =25 oC
COMPATIBLEWITH TTL OUTPUTS:
VIH =2V (MIN), VIL = 0.8V(MAX)
POWERDOWN PROTECTIONON INPUTS&
OUTPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
BALANCEDPROPAGATIONDELAYS:
tPLH tPHL
■
■
■
■
■
■
SOP
TSSOP
ORDER CODES
PACKAGE
SOP
TUBE
T & R
74VHCT157AM
74VHCT157AMTR
74VHCT157ATTR
TSSOP
OPERATING VOLTAGERANGE:
VCC (OPR)= 4.5V to 5.5V
PIN AND FUNCTION COMPATIBLEWITH
74 SERIES157
non-inverting multiplexer. When the STROBE
input is held high, selection of data is inhibited
and all the outputs become low. The SELECT
decoding determines whether the A or B inputs
get routed to their corresponding Y outputs.
■
■
IMPROVED LATCH-UP IMMUNITY
LOWNOISE:VOLP = 0.8V(Max.)
Power down protection is provided on all inputs
and outputs and 0 to 7V can be accepted on
inputs with no regard to the supply voltage. This
device can be used to interface 5V to 3V.All
inputs and outputs are equipped with protection
circuits against static discharge, giving them 2KV
ESD immunity and transient excess voltage.
DESCRIPTION
The 74VHCT157A is an high-speed CMOS
QUAD 2-CHANNEL MULTIPLEXER fabricated
with sub-micron silicon gate and double-layer
metal wiring C2MOS technology.
It consists of four 2-input digital multiplexers with
common select and strobe inputs. It is a
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/9
March 2000
74VHCT157A
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
SYMBOL NAME AND FUNCTION
SELECT Common Data Select Input
2,5,11,14
1Ato4A
1Bto4B
1Yto4Y
Data Inputs From
Source A
3,6,10,13
Data Inputs From
Source B
4,7,9,12
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”
LOGIC DIAGRAM
2/9
74VHCT157A
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
VI
Parameter
Value
-0.5to+7.0
-0.5to+7.0
-0.5to+7.0
-0.5toVCC +0.5
-20
Unit
V
Supply Voltage
DC Input Voltage
V
VO
DC Output Voltage (see note 1)
DC Output Voltage (see note 2)
DC Input Diode Current
DC Output Diode Current
DC Output Current
V
VO
V
IIK
mA
mA
mA
mA
oC
oC
IOK
20
25
±
±
IO
ICC orIGND DC VCC or Ground Current
± 50
-65to+150
300
Tstg
Storage Temperature
TL
Lead Temperature (10 sec)
AbsoluteMaximum Ratingsarethose values beyond whichdamage tothe device may occur. Functional operation under these condition isnot implied.
1)VCC=0
2)High or Low State
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
Parameter
Value
4.5to5.5
0to5.5
Unit
V
Supply Voltage
Input Voltage
V
VO
Output Voltage (see note 1)
Output Voltage (see note 2)
Operating Temperature
0to5.5
V
VO
0toVCC
-40to+85
0to20
V
oC
Top
dt/dv
ns/V
Input Rise and Fall Time (see note 3) (VCC = 5.0 0.5V)
±
1)VCC=0
2)High or Low State
3)VIN from0.8Vto2 V
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
VCC
Value
TA = 25 oC
Unit
-40 to 85 oC
(V)
Min. Typ. Max. Min. Max.
VIH
VIL
High Level Input
Voltage
4.5to5.5
2
2
V
V
Low Level Input
Voltage
4.5to5.5
0.8
0.8
VOH
High Level Output
Voltage
4.5
4.5
IO=-50µA
IO=-8mA
4.4
4.5
0.0
4.4
3.8
V
3.94
VOL
Low Level Output
Voltage
4.5
IO=50µA
0.1
0.36
±0.1
4
0.1
0.44
±1.0
40
V
4.5
IO=8mA
II
Input Leakage Current
0to5.5
5.5
VI =5.5Vor GND
µA
ICC
Quiescent Supply
Current
V =VCC orGND
A
µ
I
∆ICC
Additional Worst Case
Supply Current
5.5
0
One Input at 3.4V,
other input at VCC or
GND
1.35
0.5
1.5
5.0
mA
IOPD
Output Leakage
Current
VOUT =5.5V
µA
3/9
74VHCT157A
AC ELECTRICAL CHARACTERISTICS
(Input tr = tf =3 ns)
Symbol
Parameter
Test Condition
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
VCC
(V)
CL
(pF)
-40 to 85 oC
(*)
tPLH
tPHL
Propagation Delay
Time
A, B to Y
5.0
15
50
6.2
8.7
9.7
1.0
1.0
11.5
15.0
(*)
ns
ns
ns
5.0
13.2
(*)
tPLH
tPHL
Propagation Delay
Time
SELECT to Y
5.0
15
50
8.4
13.2
16.7
1.0
1.0
15.5
19.0
(*)
5.0
10.9
(*)
tPLH
tPHL
Propagation Delay
Time
STROBE to Y
5.0
15
50
8.7
13.6
17.1
1.0
1.0
16.0
19.5
(*)
5.0
11.2
(*)Voltage range is5V ± 0.5V
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Unit
-40 to 85 oC
Min. Typ. Max. Min. Max.
CIN
Input Capacitance
4
10
10
pF
pF
CPD
Power Dissipation
20
Capacitance (note 1)
1)CPD isdefined as thevalue ofthe IC’sinternal equivalent capacitance whichiscalculated fromthe operating current consumption without load. (Referto
TestCircuit).Average operating current can beobtained bythe followingequation. ICC(opr)= CPD • VCC • fIN + ICC/4 (per Channel)
4/9
74VHCT157A
DYNAMIC SWITCHING CHARACTERISTICS
Symbol
Parameter
Test Conditions
VCC
(V)
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
-40 to 85 oC
VOLP
VOLV
Dynamic Low Voltage
Quiet Output (note 1, 2)
5.0
0.3
0.8
-0.8
2.0
-0.3
V
IHD
Dynamic High Voltage
Input (note 1, 3)
5.0
5.0
CL = 50pF
V
VILD
Dynamic Low Voltage
Input (note 1, 3)
0.8
1)Worstcase package.
2)Max number ofoutputs defined as (n). Datainputs aredriven 0Vto5.0V, (n -1)outputs switching andone outputatGND.
3)Max number ofdatainputs (n)switching.(n-1)switching 0Vto5.0V. Inputsunder testswitching: 5.0Vtothreshold (VILD),0V tothreshold (VIHD),f=1MHz.
TEST CIRCUIT
CL = 15/50 pF or equivalent (includes jig and probe capacitance)
RT = ZOUT ofpulse generator (typically50Ω)
5/9
74VHCT157A
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS
WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS
6/9
74VHCT157A
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
7/9
74VHCT157A
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
8/9
74VHCT157A
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