74AC157 QUAD 2 CHANNEL MULTIPLEXER PRELIMINARY DATA ■ ■ ■ ■ ■ ■ ■ ■ ■ 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 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. B M (Plastic Package) (Micro Package) ORDER CODES : 74AC157B 74AC157M 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 SYMBOL NAME AND F UNCTIO N 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 SELECT 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 O UTPUT ST ROBE 74AC157 ABSOLUTE MAXIMUM RATING Symbol VCC Parameter Supply Voltage Value Unit -0.5 to +7 V VI DC Input Voltage -0.5 to VCC + 0.5 V VO DC Output Voltage -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 ± 50 mA DC VCC or Ground Current ± 200 mA ICC or IGND 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 Value Un it 2 to 6 V V VI Input Voltage 0 to VCC VO Output Voltage 0 to VCC Top dt/dv Operating Temperature: Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5 V(note 1) -40 to +85 8 V o C ns/V 1) VIN from 30% to 70% of VCC 3/9 74AC157 DC SPECIFICATIONS Symbol Parameter Test Con dition s VIH High Level Input Voltage 3.0 4.5 VO = 0.1 V or VCC - 0.1 V 5.5 VIL Low Level Input Voltage 3.0 4.5 Value o High Level Output Voltage Typ. 2.1 1.5 2.1 3.15 2.25 3.15 3.85 2.75 VO = 0.1 V or VCC - 0.1 V 3.0 4.5 Max. V 3.85 1.5 0.9 0.9 2.25 1.35 1.35 2.75 1.65 2.9 2.99 2.9 IO=-50 µA 4.4 4.49 4.4 5.49 5.4 2.46 4.5 IO=-24 mA 3.86 3.76 5.5 IO=-24 mA 4.86 3.0 IO=50 µA 0.002 0.1 0.1 IO=50 µA 0.001 0.1 0.1 IO=50 µA 0.001 0.1 0.1 4.5 VI(*) = 5.5 VIH or VIL V 1.65 IO=-50 µA 2.56 5.4 V 4.76 IO=12 mA 0.36 0.44 4.5 IO=24 mA 0.36 0.44 5.5 IO=24 mA 0.36 0.44 3.0 V Input Leakage Current 5.5 VI = VCC or GND ±0.1 ±1 µA ICC Quiescent Supply Current 5.5 VI = VCC or GND 8 80 µA IOLD Dynamic Output Current (note 1, 2) 5.5 VOLD = 1.65 V max 75 mA VOHD = 3.85 V min -75 mA II IOHD 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 Min . IO=-50 µA 3.0 Low Level Output Voltage Max. IO=-12 mA 5.5 VOL (*) VI = VIH or VIL -40 to 85 C Min. 5.5 VOH Unit o T A = 25 C V CC (V) 74AC157 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = t f =3 ns) Symbol Parameter T est Cond ition 3.3(*) tPLH tPHL Propagation Delay Time SELECT to Y 5.0 tPLH tPHL Propagation Delay Time STROBE to Y tPLH tPHL Propagation Delay Time A, B to Y Value Unit o V CC (V) o -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 5.0 8.5 1.5 9.5 3.3 5.0(**) (*) 1.5 1.5 6.5 5.5 11.0 9.0 1.5 1.5 12.0 10.0 3.3(*) 1.5 5.0 8.0 1.5 9.0 (**) 1.5 4.0 6.5 1.5 7.0 5.0 ns ns ns (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symbol Parameter Test Con dition s V CC (V) Value o T A = 25 C Min. Typ. Max. Unit o -40 to 85 C Min . Max. CIN Input Capacitance 5.0 4 pF CPD Power Dissipation Capacitance (note 1) 5.0 TBD 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 DIM. MIN. a1 0.51 B 0.77 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L Z 3.3 0.130 1.27 0.050 P001C 7/9 74AC157 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 E 5.8 10 0.385 6.2 0.228 0.393 0.244 e 1.27 0.050 e3 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 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 supersedes and replaces all information previously supplied. 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