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| M74HC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s s s s s s s HIGH SPEED : tPD = 11 ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: ICC =4A(MAX.) at TA=25C HIGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 6mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL WIDE OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 DIP SOP TSSOP ORDER CODES PACKAGE DIP SOP TSSOP TUBE M74HC257B1R M74HC257M1R T&R M74HC257RM13TR M74HC257TTR DESCRIPTION The M74HC257 is an high speed CMOS QUAD 2 CHANNEL MULTIPLEXER (3-STATE) fabricated with silicon gate C2MOS technology. This IC is composed of an independent 2-channel multiplexer with common SELECT and ENABLE (OE) input. The M74HC257 is a non-inverting multiplexer. When the ENABLE input is held "High", outputs of the IC become in a High-Impedance state. If SELECT input is held low, "A" data is selected, when SELECT is high , "B" data is chosen. All inputs are equipped with protection circuits against static discharge and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS August 2001 1/11 M74HC257 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 FUNCTION Common Data Select Input Data Input From Source A Data Input From Source B 3 State Multiplexer Outputs 3 State Output Enable Inputs (Active Low) Ground (0V) Positive Supply Voltage TRUTH TABLE INPUTS OE H L L L L X : Don't Care Z : High Impedance OUTPUT 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 DIAGRAM This logic diagram has not be used to estimate propagation delays 2/11 M74HC257 ABSOLUTE MAXIMUM RATINGS Symbol VCC VI VO IIK IOK IO PD Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Power Dissipation 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 35 70 500(*) -65 to +150 300 Unit V V V mA mA mA mA mW C C ICC or IGND DC VCC or Ground Current Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied (*) 500mW at 65 C; derate to 300mW by 10mW/C from 65C to 85C RECOMMENDED OPERATING CONDITIONS Symbol VCC VI VO Top tr, tf Supply Voltage Input Voltage Output Voltage Operating Temperature Input Rise and Fall Time VCC = 2.0V VCC = 4.5V VCC = 6.0V Parameter Value 2 to 6 0 to VCC 0 to VCC -55 to 125 0 to 1000 0 to 500 0 to 400 Unit V V V C ns ns ns 3/11 M74HC257 DC SPECIFICATIONS Test Condition Symbol Parameter VCC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 4.5 6.0 VOL Low Level Output Voltage 2.0 4.5 6.0 4.5 6.0 II IOZ Input Leakage Current High Impedance Output Leakage Current Quiescent Supply Current 6.0 6.0 6.0 IO=-20 A IO=-20 A IO=-20 A IO=-6.0 mA IO=-7.8 mA IO=20 A IO=20 A IO=20 A IO=6.0 mA IO=7.8 mA VI = VCC or GND VI = VIH or VIL VO = VCC or GND VI = VCC or GND TA = 25C Min. 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 4.18 5.68 2.0 4.5 6.0 4.31 5.8 0.0 0.0 0.0 0.17 0.18 0.1 0.1 0.1 0.26 0.26 0.1 0.5 4 1.9 4.4 5.9 4.13 5.63 0.1 0.1 0.1 0.33 0.33 1 5 40 Typ. Max. Value -40 to 85C Min. 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 4.10 5.60 0.1 0.1 0.1 0.40 0.40 1 10 80 A A A V V Max. -55 to 125C Min. 1.5 3.15 4.2 0.5 1.35 1.8 Max. V Unit VIH High Level Input Voltage Low Level Input Voltage High Level Output Voltage VIL V VOH ICC 4/11 M74HC257 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns) Test Condition Symbol Parameter VCC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 TA = 25C Min. 50 Typ. 25 7 6 45 13 11 62 18 15 45 13 11 62 18 15 40 12 10 57 17 14 28 14 13 Max. 60 12 10 100 20 17 140 28 24 100 20 17 140 28 24 110 22 19 150 30 26 140 28 24 Value -40 to 85C Min. Max. 75 15 13 125 25 21 175 35 30 125 25 21 175 35 30 140 28 24 190 38 32 175 35 30 -55 to 125C Min. Max. 90 19 15 150 30 26 210 42 36 150 30 26 210 42 36 165 33 28 225 45 38 210 42 36 ns Unit tTLH tTHL Output Transition Time tPLH tPHL Propagation Delay Time (A, B - Y) 50 ns 150 ns tPLH tPHL Propagation Delay Time (SELECT - Y) 50 ns 150 ns tPZL tPZH High Impedance Output Enable Time 50 RL = 1 K ns 150 RL = 1 K ns tPLZ tPHZ High Impedance Output Disable Time 50 RL = 1 K ns CAPACITIVE CHARACTERISTICS Test Condition Symbol Parameter VCC (V) TA = 25C Min. Typ. 5 10 47 Max. 10 Value -40 to 85C Min. Max. 10 -55 to 125C Min. Max. 10 pF pF pF Unit CIN COUT CPD Input Capacitance Output Capacitance Power Dissipation Capacitance (note 1) 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 x VCC x fIN + ICC/4 (per Channel) 5/11 M74HC257 TEST CIRCUIT TEST tPLH, tPHL tPZL, tPLZ tPZH, tPHZ CL = 50pF/150pF or equivalent (includes jig and probe capacitance) R1 = 1K or equivalent RT = ZOUT of pulse generator (typically 50) SWITCH Open VCC GND WAVEFORM 1: PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle) 6/11 M74HC257 WAVEFORM 2 :OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 7/11 M74HC257 Plastic DIP-16 (0.25) MECHANICAL DATA mm. DIM. 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 TYP. MAX. inch P001C 8/11 M74HC257 SO-16 MECHANICAL DATA DIM. 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. MIN. TYP MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.003 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010 PO13H 9/11 M74HC257 TSSOP16 MECHANICAL DATA mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 4.9 6.2 4.3 5 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 5.1 6.6 4.48 0.002 0.031 0.007 0.004 0.193 0.244 0.169 0.197 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0089 0.201 0.260 0.176 inch A A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 0080338D 10/11 M74HC257 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. Specifications 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. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2001 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 (c) http://www.st.com 11/11 |
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