M74HCT257 M74HCT257B1R M74HCT257M1R M74HCT257RM13TR M74HCT257TTR DIP-16 P001C

QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s s s s s s HIGH SPEED : tPD = 13 ns (TYP.) at VCC = 4.5V LOW POWER DISSIPATION: ICC

M74HCT257 M74HCT257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) s s s s s s HIGH SPEED : tPD = 13 ns (TYP.) at VCC = 4.5V LOW POWER DISSIPATION: ICC =4µA(MAX.) at TA=25°C COMPATIBLE WITH TTL OUTPUTS : VIH = 2V (MIN.) VIL = 0.8V (MAX) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 6mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 DESCRIPTION The M74HCT257 M74HCT257 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 M74HCT257 M74HCT257 is a non-inverting multiplexer. When the ENABLE input is held "High", outputs of DIP SOP TSSOP ORDER CODES PACKAGE TUBE DIP SOP TSSOP M74HCT257B1R M74HCT257B1R M74HCT257M1R M74HCT257M1R T&R M74HCT257RM13TR M74HCT257RM13TR M74HCT257TTR M74HCT257TTR 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 1/10 M74HCT257 M74HCT257 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL 1 SELECT 2, 5, 14, 11 3, 6, 13, 10 1A to 4A 1B to 4B 4, 7, 12, 9 1Y to 4Y 15 OE 8 16 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 OUTPUT OE SELECT A B Y H L L L L X L L H H X L H X X X X X L H Z L H L H X : Don't Care Z : High Impedance LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays 2/10 M74HCT257 M74HCT257 ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Supply Voltage Value Unit -0.5 to +7 V -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 V DC Input Diode Current ± 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ± 35 mA ± 70 mA VI DC Input Voltage VO DC Output Voltage IIK ICC or IGND DC VCC or Ground Current PD Power Dissipation Tstg Storage Temperature TL Lead Temperature (10 sec) V 500(*) mW -65 to +150 °C 300 °C 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 65°C to 85°C RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Value Unit Supply Voltage 4.5 to 5.5 V VI Input Voltage 0 to VCC V VO Output Voltage 0 to VCC V Top Operating Temperature -55 to 125 °C tr, tf Input Rise and Fall Time (VCC = 4.5 to 5.5V) 0 to 500 ns 3/10 M74HCT257 M74HCT257 DC SPECIFICATIONS Test Condition Symbol VIH VIL VOH VOL II IOZ ICC ICC Parameter High Level Input Voltage Low Level Input Voltage Min. 4.5 to 5.5 4.5 to 5.5 4.5 Low Level Output Voltage 4.5 Input Leakage Current High Impedance Output Leakage Current Quiescent Supply Current Additional Worst Case Supply Current TA = 25°C VCC (V) High Level Output Voltage Value Typ. -40 to 85°C Max. 2.0 -55 to 125°C Min. Min. Max. 2.0 0.8 Max. 2.0 0.8 V 0.8 IO=-20 µA 4.4 4.5 4.4 4.4 IO=-6.0 mA 4.18 4.31 4.13 Unit 4.10 V V IO=20 µA 0.0 0.1 0.1 0.1 IO=6.0 mA 0.17 0.26 0.33 0.40 V 5.5 VI = VCC or GND ± 0.1 ±1 ±1 µA 5.5 VI = VIH or VIL VO = VCC or GND ± 0.5 ±5 ± 10 µA 5.5 VI = VCC or GND 4 40 80 µA 5.5 Per Input pin VI = 0.5V or VI = 2.4V Other Inputs at VCC or GND IO = 0 2.0 2.9 3.0 mA AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns) Test Condition Symbol Parameter tTLH tTHL Output Transition Time tPLH tPHL Propagation Delay Time (A, B - Y) tPLH tPHL Propagation Delay Time (SELECT - Y) tPZL tPZH High Impedance Output Enable Time tPLZ tPHZ High Impedance Output Disable Time 4/10 Value TA = 25°C VCC (V) Min. -40 to 85°C -55 to 125°C Min. Min. Max. Unit Typ. Max. Max. 4.5 7 12 15 18 ns 4.5 13 20 25 30 ns 4.5 13 20 25 30 ns 4.5 RL = 1 K 12 22 28 33 ns 4.5 RL = 1 K 14 28 35 42 ns M74HCT257 M74HCT257 CAPACITIVE CHARACTERISTICS Test Condition Symbol Parameter CIN TA = 25°C VCC (V) Min. Output Capacitance Power Dissipation Capacitance (note 1) CPD -40 to 85°C Typ. Max. 5 Input Capacitance COUT Value 10 -55 to 125°C Min. Min. Max. Unit Max. 10 10 pF 10 pF 34 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 x VCC x fIN + ICC/4 (per Channel) TEST CIRCUIT TEST SWITCH tPLH, tPHL Open tPZL, tPLZ VCC tPZH, tPHZ GND CL = 50pF/150pF or equivalent (includes jig and probe capacitance) R1 = 1K or equivalent RT = ZOUT of pulse generator (typically 50) 5/10 M74HCT257 M74HCT257 WAVEFORM 1: PROPAGATION DELAY TIME (f=1MHz; 50% duty cycle) WAVEFORM 2 :OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle) 6/10 M74HCT257 M74HCT257 Plastic DIP-16 DIP-16 (0.25) MECHANICAL DATA mm. inch DIM. MIN. a1 0.77 MAX. 0.51 B TYP 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 P001C 7/10 M74HCT257 M74HCT257 SO-16 SO-16 MECHANICAL DATA DIM. mm. MIN. TYP A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.003 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 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.) PO13H PO13H 8/10 M74HCT257 M74HCT257 TSSOP16 TSSOP16 MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. MAX. 1.2 A1 0.05 A2 0.8 b 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0089 D 4.9 5 5.1 0.193 0.197 0.201 E 6.2 6.4 6.6 0.244 0.252 0.260 E1 4.3 4.4 4.48 0.169 0.173 0.176 1 e 0.65 BSC K 0° L 0.45 A 0.0256 BSC 8° 0.60 0° 0.75 8° 0.018 0.024 0.030 A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 0080338D 0080338D 9/10 M74HCT257 M74HCT257 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. © The ST logo is a registered trademark of STMicroelectronics © 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 © http://www.st.com 10/10