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Part: 74VHC157
Category:
Logic
-> VHC/VHCT->Low Noise HCMOS
Description: Quad 2 Channel Multiplexer
Company: ST Microelectronics, Inc.
Datasheet: Download 74VHC157 datasheet File size : 110 kB
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Datasheet text preview:
74VHC157
QUAD 2 CHANNEL MULTIPLEXER
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H IGH SPEED: tPD = 4.1 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C H IGH NOISE IMMUNITY: VNIH = V NIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC(OPR) = 2V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 157 IMPROVED LATCH-UP IMMUNITY LOW NOISE: VOLP = 0.8V (MAX.)
SOP
TSSOP
ORDER CODES
PACKAGE SOP TSSOP TUBE 74VHC157M T&R 74VHC157MTR 74VHC157TTR
DESCRIPTION The 74VHC157 is an advanced 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 multiplexer with common select and strobe inputs. It is a 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. Power down protection is provided on all inputs 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.
PIN CONNECTION AND IEC LOGIC SYMBOLS
June 2001
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74VHC157
INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1 2, 5, 11, 14 3, 6, 10, 13 4, 7, 9, 12 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y STROBE GND V CC NAME AND FUNCTION Common Data Select Inputs Data Inputs From Source A Data Inputs From Source B Multiplexer Outputs Strobe Input Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUTS STROBE H L L L L
X : Don't care
OUTPUT A X L H X X B X X X L H Y L L H L H
SELECT X L L H H
LOGIC DIAGRAM
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74VHC157
AB SOLUTE MAXIMUM RATINGS
Symbol V CC VI VO IIK IOK IO Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7.0 -0.5 to +7.0 -0.5 to VCC + 0.5 - 20 ± 20 ± 25 ± 50 -65 to +150 300 Unit V V V mA mA mA mA °C °C
ICC or IGND DC VCC or Ground Current
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 V CC VI VO Top dt/dv Supply Voltage Input Voltage Output Voltage Operating Temperature Input Rise and Fall Time (note 1) (VCC = 3.3 ± 0.3V) (VCC = 5.0 ± 0.5V) Parameter Value 2 to 5.5 0 to 5.5 0 to VCC -55 to 125 0 to 100 0 to 20 Unit V V V °C ns/V
1) VIN from 30% to 70% of V CC
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74VHC157
DC SPECIFICATIONS
Test Condition Symbol Parameter VCC (V) 2.0 3.0 to 5.5 2.0 3.0 to 5.5 2.0 3.0 4.5 3.0 4.5 VOL Low Level Output Voltage 2.0 3.0 4.5 3.0 4.5 II ICC Input Leakage Current Quiescent Supply Current 0 to 5.5 5.5 IO=-50 µA IO=-50 µA IO=-50 µA IO=-4 mA IO=-8 mA IO=50 µA IO=50 µA IO=50 µA IO=4 mA IO=8 mA VI = 5.5V or GND VI = VCC or GND TA = 25°C Min. 1.5 0.7VCC 0.5 0.3VCC 1.9 2.9 4.4 2.58 3.94 0.0 0.0 0.0 0.1 0.1 0.1 0.36 0.36 ± 0.1 4 2.0 3.0 4.5 1.9 2.9 4.4 2.48 3.8 0.1 0.1 0.1 0.44 0.44 ±1 40 Typ. Max. Value -40 to 85°C Min. 1.5 0.7VCC 0.5 0.3VCC 1.9 2.9 4.4 2.4 3.7 0.1 0.1 0.1 0.55 0.55 ±1 40 µA µA V V Max. -55 to 125°C Min. 1.5 0.7VCC 0.5 0.3VCC V V Max. Unit
VIH
High Level Input Voltage Low Level Input Voltage High Level Output Voltage
VIL
VOH
AC ELECTRICAL CHARACTERISTICS (Input tr = tf = 3ns)
Test Condition Symbol Parameter VC C (V) 3.3(*) 3.3(*) 5.0 tPLH tPHL Propagation Delay Time SELECT to Y
(**)
Value TA = 25°C Min. Typ. 6.2 8.7 4.1 5.6 8.4 10.9 5.3 6.8 8.7 11.2 5.6 7.1 Max. 9.7 13.2 6.4 8.4 13.2 16.7 8.1 10.1 13.6 17.1 8.6 10.6 -40 to 85°C Min. 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max. 11.5 15.0 7.5 9.5 15.5 19.0 9.5 11.5 16.0 19.5 10.0 12.0 -55 to 125°C Min. 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max. 11.5 15.0 7.5 9.5 15.5 19.0 9.5 11.5 16.0 19.5 10.0 12.0 ns ns ns Unit
CL (pF) 15 50 15 50 15 50 15 50 15 50 15 50
tPLH tPHL
Propagation Delay Time A, B to Y
5.0(**) 3.3(*) 3.3(*) 5.0 tPLH tPHL
(**)
5.0(**) Propagation Delay 3.3(*) Time STROBE to Y 3.3(*) 5.0(**) 5.0(**)
(*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ± 0.5V
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74VHC157
CA PACITIVE CHARACTERISTICS
Test Condition Symbol Parameter Min. CIN CPD Input Capacitance Power Dissipation Capacitance (note 1) TA = 25°C Typ. 6 18 Max. 10 Value -40 to 85°C Min. Max. 10 -55 to 125°C Min. Max. 10 pF pF Unit
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 x VCC x fIN + ICC/4 (per channel)
DYNAMIC SWITCHING CHARACTERISTICS
Test Condition Symbol Parameter VCC (V) 5.0 TA = 25°C Min. Typ. 0.3 -0.8 CL = 50 pF 3.5 -0.3 Max. 0.8 V Value -40 to 85°C Min. Max. -55 to 125°C Min. Max. Unit
VOLP VOLV VIHD
VILD
Dynamic Low Voltage Quiet Output (note 1, 2) Dynamic High Voltage Input (note 1, 3) Dynamic Low Voltage Input (note 1, 3)
5.0
V
5.0
1.5
V
1) Worst case package. 2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n-1) outputs switching and one output at GND. 3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz.
TEST CIRCUIT
CL =15/50pF or equivalent (includes jig and probe capacitance) RT = ZOUT of pulse generator (typically 50)
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