74VHCT157A QUAD 2 CHANNEL MULTIPLEXER PRELIMINARY DATA ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 6.2 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (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.) 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 SOP TSSOP ORDER CODES PACKAGE T UBE T& R SOP 74VHCT157AM 74VHCT157AMTR TSSOP 74VHCT157ATTR 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 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 74VHCT157A ABSOLUTE MAXIMUM RATINGS Symbol Parameter Supply Voltage VCC Value Unit -0.5 to +7.0 V VI DC Input Voltage -0.5 to +7.0 V VO DC Output Voltage (see note 1) -0.5 to +7.0 V VO DC Output Voltage (see note 2) -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 ± 50 mA ICC orIGND Tstg TL DC VCC or Ground Current Storage Temperature -65 to +150 o 300 o Lead Temperature (10 sec) 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 Parameter Supply Voltage Valu e Unit 4.5 to 5.5 V VI Input Voltage 0 to 5.5 V VO Output Voltage (see note 1) 0 to 5.5 V VO Output Voltage (see note 2) Top Operating Temperature dt/dv 0 to VCC V o -40 to +85 Input Rise and Fall Time (see note 3) (V CC = 5.0 ± 0.5V) C 0 to 20 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 Min. 2 VIH High Level Input Voltage 4.5 to 5.5 VIL Low Level Input Voltage 4.5 to 5.5 VOH High Level Output Voltage VOL Low Level Output Voltage Value T A = 25 o C V CC (V) Typ . Un it -40 to 85 o C Max. Min . 0.8 4.5 IO=-50 µA 4.4 4.5 IO=-8 mA 3.94 4.5 IO=50 µA 4.5 Max. 2 4.5 V 0.8 4.4 V 3.8 0.0 V 0.1 0.1 IO=8 mA 0.36 0.44 V 0 to 5.5 VI = 5.5V or GND ±0.1 ±1.0 µA ICC Quiescent Supply Current 5.5 VI = VCC orGND 4 40 µA ∆ICC Additional Worst Case Supply Current 5.5 One Input at 3.4V, other input at VCC or GND 1.35 1.5 mA IOPD Output Leakage Current 0 VOUT = 5.5V 0.5 5.0 µA II Input Leakage Current 3/9 74VHCT157A AC ELECTRICAL CHARACTERISTICS (Input t r = tf =3 ns) Symb ol Parameter 5.0(*) 15 Value T A = 25 o C Min. Typ . Max. 6.2 9.7 5.0(*) 50 8.7 13.2 1.0 15.0 5.0(*) 15 8.4 13.2 1.0 15.5 5.0 (*) 50 10.9 16.7 1.0 19.0 ns 5.0(*) 5.0(*) 15 50 8.7 11.2 13.6 17.1 1.0 1.0 16.0 19.5 ns 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 ) Un it -40 to 85 o C Min . Max. 1.0 11.5 ns (*) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symb ol Parameter T est Cond ition s Value o Min. Un it o T A = 25 C -40 to 85 C Typ . Max. CIN Input Capacitance 4 10 CPD Power Dissipation Capacitance (note 1) 20 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 74VHCT157A 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 2.0 V 0.8 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 74VHCT157A WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS 6/9 74VHCT157A 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 74VHCT157A 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. 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 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