74VHC157 QUAD 2 CHANNEL MULTIPLEXER PRELIMINARY DATA ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4.1 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 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.) DESCRIPTION The 74VHC157 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 M1 (Micro Package) T (TSSOP Package) ORDER CODES : 74VHC157M 74VHC157T 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 1999 1/9 74VHC157 INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCT ION 1 SELECT Common Data Select Input 2, 5, 11, 14 1A to 4A 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 STROBE Strobe Input 8 GND Ground (0V) 16 VCC Positive Supply Voltage TRUTH TABLE INPUT SELE CT A B Y H X X X L L L L X L L L H X H L H X L L L H X H H X:”H” or ”L” LOGIC DIAGRAM 2/9 OUT PUT STROBE 74VHC157 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Supply Voltage VCC VI DC Input Voltage VO DC Output Voltage Value Unit -0.5 to +7.0 V -0.5 to +7.0 V -0.5 to VCC + 0.5 V IIK DC Input Diode Current - 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 25 mA DC VCC or Ground Current ± 50 mA ICC orIGND Tstg Storage Temperature TL Lead Temperature (10 sec) -65 to +150 o 300 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. RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage Valu e Unit 2.0 to 5.5 V VI Input Voltage 0 to 5.5 V VO Output Voltage 0 to VCC V Top Operating Temperature dt/dv o -40 to +85 Input Rise and Fall Time (see note 1) (VCC = 3.3 ± 0.3V) (V CC = 5.0 ± 0.5V) C 0 to 100 0 to 20 ns/V ns/V 1) VIN from 30% to70%of VCC DC SPECIFICATIONS Symb ol VIH VIL VOH VOL II ICC Parameter T est Cond ition s Value o Min. Typ . Un it o T A = 25 C V CC (V) -40 to 85 C Max. Min . Max. High Level Input Voltage 2.0 1.5 1.5 3.0 to 5.5 0.7VCC 0.7VCC Low Level Input Voltage 2.0 0.5 0.5 3.0 to 5.5 0.3VCC 0.3VCC High Level Output Voltage Low Level Output Voltage Input Leakage Current Quiescent Supply Current V 2.0 IO=-50 µA 1.9 2.0 1.9 3.0 IO=-50 µA 2.9 3.0 2.9 4.5 IO=-50 µA 4.4 4.5 4.4 3.0 IO=-4 mA 2.58 4.5 IO=-8 mA 3.94 2.0 IO=50 µA 0.0 0.1 0.1 3.0 IO=50 µA 0.0 0.1 0.1 4.5 IO=50 µA 0.0 0.1 0.1 V V 2.48 3.8 V 3.0 IO=4 mA 0.36 0.44 4.5 IO=8 mA 0.36 0.44 0 to 5.5 VI = 5.5V or GND ±0.1 ±1.0 µA 5.5 VI = VCC orGND 4 40 µA 3/9 74VHC157 AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns) Symb ol Parameter 3.3(*) 15 Value T A = 25 o C Min. Typ . Max. 6.2 9.7 3.3(*) 5.0(**) 5.0(**) 3.3(*) 3.3(*) 50 15 50 15 50 8.7 4.1 5.6 8.4 10.9 13.2 6.4 8.4 13.2 16.7 1.0 1.0 1.0 1.0 1.0 15.0 7.5 9.5 15.5 19.0 5.0 5.0(**) (**) 15 50 5.3 6.8 8.1 10.1 1.0 1.0 9.5 11.5 (*) 15 50 15 50 8.7 11.2 5.6 7.1 13.6 17.1 8.6 10.6 1.0 1.0 1.0 1.0 16.0 19.5 10.0 12.0 V CC (V) tPLH tPHL Propagation Delay Time A, B to Y tPLH tPHL Propagation Delay Time SELECT to Y tPLH tPHL Propagation Delay Time STROBE to Y Test Co ndition CL (pF ) 3.3 3.3(*) 5.0(**) 5.0(**) Un it -40 to 85 o C Min . Max. 1.0 11.5 ns ns ns (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symb ol Parameter T est Cond ition s Value T A = 25 o C Min. Typ . Max. 10 CIN Input Capacitance 4 CPD Power Dissipation Capacitance (note 1) 20 Un it -40 to 85 o C Min . Max. 10 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 74VHC157 DYNAMIC SWITCHING CHARACTERISTICS Symb ol Parameter T est Cond ition s Dynamic Low Voltage Quiet Output (note 1, 2) 5.0 VIHD Dynamic High Voltage Input (note 1, 3) 5.0 VILD Dynamic Low Voltage Input (note 1, 3) 5.0 VOLP VOLV Value T A = 25 o C V CC (V) Min. -0.8 CL = 50 pF Un it -40 to 85 o C Typ . Max. 0.3 0.8 Min . Max. -0.3 3.5 V 1.5 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 50Ω) 5/9 74VHC157 WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS 6/9 74VHC157 SO-16 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.004 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45 (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 e3 0.050 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.62 0.024 8 (max.) P013H 7/9 74VHC157 TSSOP16 MECHANICAL DATA mm DIM. MIN. inch TYP. A MAX. MIN. MAX. 1.1 0.433 A1 0.05 0.10 0.15 0.002 0.004 0.006 A2 0.85 0.9 0.95 0.335 0.354 0.374 b 0.19 0.30 0.0075 0.0118 c 0.09 0.20 0.0035 0.0079 D 4.9 5 5.1 0.193 0.197 0.201 E 6.25 6.4 6.5 0.246 0.252 0.256 E1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 BSC 0.0256 BSC K 0o 4o 8o 0o 4o 8o L 0.50 0.60 0.70 0.020 0.024 0.028 A A2 A1 b e K c E1 PIN 1 IDENTIFICATION 1 L E D 8/9 TYP. 74VHC157 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. 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 without express written approval of STMicroelectronics. The ST logo is a trademark of STMicroelectronics 1999 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com . 9/9