74AC157

74AC157 QUAD 2 CHANNEL MULTIPLEXER PRELIMINARY DATA s s s s s s s s s HIGH SPEED: tPD = 4 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 µA (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) 50Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 157 IMPROVED LATCH-UP IMMUNITY B M (Plastic Package) (Micro Package) ORDER CODES : 74AC157B 74AC157M DESCRIPTION The AC157 is an high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power applications maintaining high speed operation similar to equivalent Bipolar Schottky TTL. 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 inhibit and all the outputs become low. The SELECT decoding determines whether the A or B inputs get routed to their corresponding Y outputs. 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 May 1997 1/9 74AC157 INPUT AND OUTPUT 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 F UNCTIO N 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 ST ROBE H L L L L X: ”H” or ”L” O UTPUT 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 2/9 74AC157 ABSOLUTE MAXIMUM RATING Symbol VCC VI VO IIK IOK IO ICC or IGND Tstg TL Supply Voltage DC Input Voltage DC Output Voltage 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 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 ± 20 ± 20 ± 50 ± 200 -65 to +150 300 Unit 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. RECOMMENDED OPERATING CONDITIONS Symbol VCC VI VO Top dt/dv Supply Voltage Input Voltage Output Voltage Operating Temperature: Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5 V(note 1) Parameter Value 2 to 6 0 to VCC 0 to VCC -40 to +85 8 Un it V V V o C ns/V 1) VIN from 30% to 70% of VCC 3/9 74AC157 DC SPECIFICATIONS Symbol Parameter V CC (V) VIH High Level Input Voltage 3.0 4.5 5.5 VIL Low Level Input Voltage 3.0 4.5 5.5 VOH High Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 VOL Low Level Output Voltage 3.0 4.5 5.5 3.0 4.5 5.5 II ICC IOLD IOHD Input Leakage Current Quiescent Supply Current Dynamic Output Current (note 1, 2) 5.5 5.5 5.5 VI(*) = VIH or VIL VI = VIH or VIL (*) Test Con dition s o Value T A = 25 C Min. Typ. 1.5 2.25 2.75 1.5 2.25 2.75 2.9 4.4 5.4 2.56 3.86 4.86 0.002 0.001 0.001 0.1 0.1 0.1 0.36 0.36 0.36 ±0.1 8 2.99 4.49 5.49 0.9 1.35 1.65 2.9 4.4 5.4 2.46 3.76 4.76 0.1 0.1 0.1 0.44 0.44 0.44 ±1 80 75 -75 Max. -40 to 85 C Min . 2.1 3.15 3.85 0.9 1.35 1.65 Max. o Unit VO = 0.1 V or VCC - 0.1 V VO = 0.1 V or VCC - 0.1 V IO=-50 µA IO=-50 µA IO=-50 µA IO=-12 mA IO=-24 mA IO=-24 mA IO=50 µA IO=50 µA IO=50 µA IO=12 mA IO=24 mA IO=24 mA VI = VCC or GND VI = VCC or GND VOLD = 1.65 V max VOHD = 3.85 V min 2.1 3.15 3.85 V V V V µA µA mA mA 1) Maximum test duration 2ms, one output loaded at time 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω. 4/9 74AC157 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = t f =3 ns) Symbol Parameter V CC (V) tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay Time SELECT to Y Propagation Delay Time STROBE to Y Propagation Delay Time A, B to Y 3.3(*) 5.0 (**) (*) T est Cond ition o Value -40 to 85 C T A = 25 C Min. Typ. Max. Min . Max. 1.5 6.5 11.0 1.5 12.0 1.5 1.5 1.5 1.5 1.5 5.0 6.5 5.5 5.0 4.0 8.5 11.0 9.0 8.0 6.5 1.5 1.5 1.5 1.5 1.5 9.5 12.0 10.0 9.0 7.0 o Unit ns ns ns 3.3 5.0(**) 3.3(*) 5.0 (**) (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symbol Parameter V CC (V) CIN CPD Input Capacitance Power Dissipation Capacitance (note 1) 5.0 5.0 Test Con dition s o Value T A = 25 C Min. Typ. 4 TBD Max. -40 to 85 C Min . Max. o Unit pF pF 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 • VCC • fIN + ICC/n (per circuit) TEST CIRCUIT 5/9 74AC157 WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS 6/9 74AC157 Plastic DIP-16 (0.25) MECHANICAL DATA mm MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 TYP. MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 inch TYP. MAX. DIM. P001C 7/9 74AC157 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 8/9 74AC157 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersede and replaces all information previously supplied. s SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. © 1997 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A . 9/9