M74HC251TTR 8-CHANNEL MULTIPLEXER (3-STATE)

Transcription

1 8-CHANNEL MULTIPLEXER (3-STATE) HIGH SPEED : t PD = 17 ns (TYP.) at V CC = 6V LOW POWER DISSIPATION: I CC =4µA(MAX.) at T A =25 C HIGH NOISE IMMUNITY: V NIH = V NIL = 28 % V CC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: I OH = I OL = 4mA (MIN) BALANCED PROPAGATION DELAYS: t PLH t PHL WIDE OPERATING VOLTAGE RANGE: V CC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 251 DESCRIPTION The M74HC251 is an high speed CMOS 8-CHANNEL MULTIPLEXER (3-STATE) fabricated with silicon gate C 2 MOS technology. This Multiplexer features both true (Y) and complement (W) outputs as well as STROBE input. When the STROBE is high, both outputs are DIP ORDER CODES SOP TSSOP PACKAGE TUBE T & R DIP M74HC251B1R SOP M74HC251M1R M74HC251RM13TR TSSOP M74HC251TTR in the high impedance state. When enabled, address information on the data select inputs determines which data input is routed to Y and W. All inputs are equipped with protection circuits against static discharge and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS July /11

2 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 4, 3, 2, 1, 15, 14, 13, 12 D0 to D7 Multiplexer Inputs 5 Y Multiplexer Output 6 W Complementary Multiplexer Output 7 STROBE 3 State Output Enable Input 11, 10, 9 A, B, C Select Inputs 8 GND Ground (0V) 16 Vcc Positive Supply Voltage TRUTH TABLE INPUTS OUTPUTS STROBE C B A S Y W X X X H Z Z L L L L D0 D0 L L H L D1 D1 L H L L D2 D2 L H H L D3 D3 H L L L D4 D4 H L H L D5 D5 H H L L D6 D6 H H H L D7 D7 X : Don t Care Z : High Impedance 2/11

3 LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V CC Supply Voltage -0.5 to +7 V V I DC Input Voltage -0.5 to V CC V V O DC Output Voltage -0.5 to V CC V I IK DC Input Diode Current ± 20 ma I OK DC Output Diode Current ± 20 ma I O DC Output Current ± 25 ma I CC or I GND DC V CC or Ground Current ± 50 ma P D Power Dissipation 500(*) mw T stg Storage Temperature -65 to +150 C T L Lead Temperature (10 sec) 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 3/11

4 RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit V CC Supply Voltage 2 to 6 V V I Input Voltage 0 to V CC V V O Output Voltage 0 to V CC V T op Operating Temperature -55 to 125 C t r, t f V CC = 4.5V 0 to 500 ns Input Rise and Fall Time V CC = 2.0V 0 to 1000 ns V CC = 6.0V 0 to 400 ns DC SPECIFICATIONS Test Condition Value Symbol Parameter V CC (V) T A = 25 C -40 to 85 C -55 to 125 C Min. Typ. Max. Min. Max. Min. Max. Unit V IH V IL V OH V OL I I I OZ I CC High Level Input Voltage Low Level Input Voltage High Level Output Voltage Low Level Output Voltage Input Leakage Current High Impedance Output Leakage Current Quiescent Supply Current I O =-20 µa I O =-20 µa I O =-20 µa I O =-4.0 ma I O =-5.2 ma I O =20 µa I O =20 µa I O =20 µa I O =4.0 ma I O =5.2 ma V I = V CC or GND ± 0.1 ± 1 ± 1 µa 6.0 V I = V IH or V IL V O = V CC or GND ± 0.5 ± 5 ± 10 µa 6.0 V I = V CC or GND µa V V V V 4/11

5 AC ELECTRICAL CHARACTERISTICS (C L = 50 pf, Input t r = t f = 6ns) Test Condition Value Symbol Parameter V CC (V) T A = 25 C -40 to 85 C -55 to 125 C Min. Typ. Max. Min. Max. Min. Max. Unit t TLH t THL t PLH t PHL t PHL t PZL t PZH t PLZ t PHZ Output Transition Time Propagation Delay Time (D - Y, W) Propagation Delay Time (A, B, C -Y, W) High Impedance Output Enable Time High Impedance Output Disable Time R L = 1 KΩ R L = 1 KΩ ns ns ns ns ns CAPACITIVE CHARACTERISTICS Test Condition Value Symbol Parameter V CC T A = 25 C -40 to 85 C -55 to 125 C Unit (V) Min. Typ. Max. Min. Max. Min. Max. C IN Input Capacitance pf C PD Power Dissipation Capacitance (note pf 1) 1) C PD 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. I CC(opr) = C PD x V CC x f IN + I CC 5/11

6 TEST CIRCUIT TEST SWITCH t PLH, t PHL t PZL, t PLZ t PZH, t PHZ C L = 50pF/150pF or equivalent (includes jig and probe capacitance) R 1 = 1KΩ or equivalent R T = Z OUT of pulse generator (typically 50Ω) Open V CC GND WAVEFORM 1: PROPAGATION DELAY TIME (f=1mhz; 50% duty cycle) 6/11

7 WAVEFORM 2 : OUTPUT ENABLE AND DISABLE TIME (f=1mhz; 50% duty cycle) 7/11

8 Plastic DIP-16 (0.25) MECHANICAL DATA DIM. mm. inch MIN. TYP MAX. MIN. TYP. MAX. a B b b D E e e F I L Z P001C 8/11

9 SO-16 MECHANICAL DATA DIM. mm. inch MIN. TYP MAX. MIN. TYP. MAX. A a a b b C c1 45 (typ.) D E e e F G L M S 8 (max.) PO13H 9/11

10 TSSOP16 MECHANICAL DATA DIM. mm. inch MIN. TYP MAX. MIN. TYP. MAX. A A A b c D E E e 0.65 BSC BSC K L A A2 A1 b e c K L E D E1 PIN 1 IDENTIFICATION D 10/11

11 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 11/11

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