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| 74ACT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s s s s s s s s s HIGH SPEED: tPD =5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 A (MAX.) at TA = 25 oC COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN), VIL = 0.8V (MAX) 50 TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 IMPROVED LATCH-UP IMMUNITY B M (Plastic Package) (Micro Package) ORDER CODES : 74ACT257B 74ACT257M ENABLE INPUT. The AC257 is a non inverting multiplexer. When the ENABLE INPUT is held "High" outputs of both IC's become high impedance state. If SELECT INPUT is held "Low", "A" data is selected, when SELECT INPUT is "High", "B" data is closen. The device is designed to interface directly High Speed CMOS systems with TTL, NMOS and CMOS output voltage levels. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. DESCRIPTION The ACT257 is an advanced high-speed CMOS QUAD 2 CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power applications mantaining high speed operation similar to equivalent Bipolar Schottky TTL. These IC's are composed of an independent 2 channel multiplexer with common SELECT and PIN CONNECTION AND IEC LOGIC SYMBOLS April 1997 1/10 74ACT257 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1 2, 5, 14, 11 3, 6, 13, 10 4, 7, 12, 9 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y OE GND VCC NAME AND F UNCTIO N Common Data Select Input Data Input From Source A Data Inputs from Source B 3 State Multiplexer Outputs 3 State Output Enable Inputs (Active LOW) Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT S OE H L L L L X = DON'T CARE Z = HIGH IMPEDANCE OUT PUT S A X L H X X B X X X L H Y Z L H L H SELECT X L L H H LOGIC DIAGRAMS This logic diagram has not be used to estimate propagation delays 2/10 74ACT257 ABSOLUTE MAXIMUM RATINGS Symbol VCC VI VO IIK IOK IO Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output 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 ICC or IGND DC VCC or Ground Current 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 = 4.5 to 5.5V (note 1) Parameter Valu e 4.5 to 5.5 0 to VCC 0 to VCC -40 to +85 8 Unit V V V o C ns/V 1) VIN from 0.8 V to 2.0 V 3/10 74ACT257 DC SPECIFICATIONS Symbol Parameter V CC (V) VIH VIL VOH High Level Input Voltage Low Level Input Voltage High Level Output Voltage 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Low Level Output Voltage 4.5 5.5 4.5 5.5 II IOZ ICCT ICC IOLD IOHD Input Leakage Current 3 State Output Leakage Current Max ICC /Input Quiescent Supply Current Dynamic Output Current (note 1, 2) 5.5 5.5 5.5 5.5 5.5 V I (*) = V IH or V IL VO = 0.1 V or VCC - 0.1 V VO = 0.1 V or VCC - 0.1 V VI = V IH or V IL (*) Test Con dition s Min. 2.0 2.0 Typ. 1.5 1.5 1.5 1.5 4.4 5.4 3.86 4.86 0.001 0.001 4.49 5.49 Value T A = 25 oC Max. -40 to 85 o C Min . 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.36 0.36 0.1 0.5 0.6 8 0.1 0.1 0.44 0.44 1 5 1.5 80 75 -75 0.8 0.8 Max. Unit V V V IO=-50 A IO=-50 A IO=-24 mA IO=-24 mA IO=50 A IO=50 mA IO=24 mA IO=24 mA V VI = VCC or GND VI = VIH or VIL VO = VCC or GND VI = VCC -2.1 V VI = VCC or GND VOLD = 1.65 V max VOHD = 3.85 V min A A mA A 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 . (*) All outputs loaded. 4/10 74ACT257 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 , Input tr = t f =3 ns) Symbol Parameter V CC (V) tPLH tPHL tPLH tPHL tPZL tPZH tPLZ tPHZ Propagation Delay Time A, B to Y Propagation Delay Time SEL to Y Output Enable Time Output Disable Time 5.0 5.0 (*) T est Cond ition Value T A = 25 oC -40 to 85 o C Min. Typ. Max. Min . Max. 5.0 6.0 5.0 6.0 7.0 9.0 8.0 9.0 8.0 10.0 9.0 10.0 Unit ns ns ns ns (*) 5.0(*) 5.0 (*) (*) Voltage range is 5V 0.5V CAPACITIVE CHARACTERISTICS Symbol Parameter V CC (V) CIN C OUT C PD Input Capacitance Input Capacitance Power Dissipation Capacitance (note 1) 5.0 5.0 5.0 Test Con dition s Min. Typ. 4 8 31 Value T A = 25 oC Max. -40 to 85 o C Min . Max. pF pF pF Unit 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 TEST t PLH, tPHL t PZL, tPLZ t PZH, tPHZ CL = 50 pF or equivalent (includes jig and probe capacitance) RL = R1 = 500 or equivalent RT =ZOUT of pulse generator (typically 50) SWITCH Open 2VCC Open 5/10 74ACT257 WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS (f=1MHz; 50% duty cycle) WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS (f=1MHz; 50% duty cycle) 6/10 74ACT257 WAVEFORM 3: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 7/10 74ACT257 Plastic DIP16 (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 8/10 74ACT257 SO16 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 9/10 74ACT257 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. (c) 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 . 10/10 |
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