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| (R) 74VHCT157A QUAD 2 CHANNEL MULTIPLEXER PRELIMINARY DATA s s s s s s s s s s HIGH SPEED: tPD = 6.2 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 A (MAX.) at TA = 25 oC COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN), VIL = 0.8V (MAX) POWER DOWN PROTECTION ON INPUTS & OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 8 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 157 IMPROVED LATCH-UP IMMUNITY LOW NOISE: VOLP = 0.8V (Max.) SOP PACKAGE SOP TSSOP T UBE 74VHCT157AM TSSOP T&R 74VHCT157AMTR 74VHCT157ATTR ORDER CODES 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 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 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. PIN CONNECTION AND IEC LOGIC SYMBOLS March 2000 1/9 74VHCT157A 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 VCC NAME AND FUNCT ION Common Data Select Input Data Inputs From Source A Data Inputs From Source B Multiplexer Outputs Strobe Input Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT STROBE H L L L L X:"H" or "L" OUT PUT A X L H X X B X X X L H Y L L H L H SELE CT X L L H H LOGIC DIAGRAM 2/9 74VHCT157A ABSOLUTE MAXIMUM RATINGS Symbol VCC VI VO VO IIK IOK IO ICC orIGND Tstg TL Supply Voltage DC Input Voltage DC Output Voltage (see note 1) DC Output Voltage (see note 2) DC Input Diode Current DC Output Diode Current DC Output Current DC VCC or Ground Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7.0 -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 V mA mA mA mA o o C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 1) VCC=0 2) High or Low State RECOMMENDED OPERATING CONDITIONS Symbol VCC VI VO VO Top dt/dv Supply Voltage Input Voltage Output Voltage (see note 1) Output Voltage (see note 2) Operating Temperature Input Rise and Fall Time (see note 3) (V CC = 5.0 0.5V) Parameter Valu e 4.5 to 5.5 0 to 5.5 0 to 5.5 0 to VCC -40 to +85 0 to 20 Unit V V V V o C ns/V 1) VCC=0 2) High or Low State 3)VIN from0.8V to 2 V DC SPECIFICATIONS Symb ol Parameter T est Cond ition s V CC (V) VIH VIL VOH VOL II ICC ICC High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage Input Leakage Current Quiescent Supply Current Additional Worst Case Supply Current Output Leakage Current 4.5 to 5.5 4.5 to 5.5 4.5 4.5 4.5 4.5 0 to 5.5 5.5 5.5 IO=-50 A IO=-8 mA IO=50 A IO=8 mA VI = 5.5V or GND VI = VCC orGND One Input at 3.4V, other input at VCC or GND VOUT = 5.5V 4.4 3.94 0.0 0.1 0.36 0.1 4 1.35 4.5 Min. 2 0.8 4.4 3.8 0.1 0.44 1.0 40 1.5 Typ . Value T A = 25 o C Max. -40 to 85 o C Min . 2 0.8 Max. V V Un it V V A A mA IOPD 0 0.5 5.0 A 3/9 74VHCT157A AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns) Symb ol Parameter V CC (V) tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay Time A, B to Y Propagation Delay Time SELECT to Y Propagation Delay Time STROBE to Y 5.0(*) 5.0(*) 5.0(*) 5.0 (*) Test Co ndition CL (pF ) 15 50 15 50 15 50 Value T A = 25 o C Min. Typ . Max. 6.2 9.7 8.7 8.4 10.9 8.7 11.2 13.2 13.2 16.7 13.6 17.1 Un it -40 to 85 o C Min . Max. 1.0 11.5 1.0 1.0 1.0 1.0 1.0 15.0 15.5 19.0 16.0 19.5 ns ns 5.0(*) 5.0(*) ns (*) Voltage range is 5V 0.5V CAPACITIVE CHARACTERISTICS Symb ol Parameter T est Cond ition s o Value T A = 25 C Min. Typ . 4 20 Max. 10 -40 to 85 C Min . Max. 10 o Un it CIN CPD Input Capacitance Power Dissipation Capacitance (note 1) pF pF 1) CPD isdefined as the value of the IC'sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto Test Circuit).Average operating current can be obtained by the following equation. ICC(opr) = CPD * VCC * fIN + ICC/4 (per Channel) 4/9 74VHCT157A DYNAMIC SWITCHING CHARACTERISTICS Symb ol Parameter T est Cond ition s V CC (V) 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 -0.8 5.0 5.0 CL = 50 pF 2.0 0.8 Min. Typ . 0.3 -0.3 V Value T A = 25 o C Max. 0.8 -40 to 85 o C Min . Max. Un it 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 to5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold (VIHD), f=1MHz. TEST CIRCUIT CL = 15/50 pF or equivalent (includes jig and probe capacitance) RT = ZOUT of pulse generator (typically 50) 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 DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 9.8 5.8 1.27 8.89 4.0 5.3 1.27 0.62 8 (max.) 0.149 0.181 0.019 10 6.2 0.35 0.19 0.5 45 (typ.) 0.385 0.228 0.050 0.350 0.157 0.208 0.050 0.024 0.393 0.244 0.1 mm TYP. MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.004 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010 P013H 7/9 74VHCT157A TSSOP16 MECHANICAL DATA mm MIN. A A1 A2 b c D E E1 e K L 0o 0.50 0.05 0.85 0.19 0.09 4.9 6.25 4.3 5 6.4 4.4 0.65 BSC 4o 0.60 8o 0.70 0o 0.020 0.10 0.9 TYP. MAX. 1.1 0.15 0.95 0.30 0.20 5.1 6.5 4.48 0.002 0.335 0.0075 0.0035 0.193 0.246 0.169 0.197 0.252 0.173 0.0256 BSC 4o 0.024 8o 0.028 0.004 0.354 MIN. inch TYP. MAX. 0.433 0.006 0.374 0.0118 0.0079 0.201 0.256 0.176 DIM. A A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 8/9 74VHCT157A Information furnished is believed to be accurate and reliable. However, STMicroelectronic s 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. Specification 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 withoutexpress written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 2000 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com . 9/9 |
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