PDF MC74VHC257 Data sheet ( Hoja de datos )

Número de pieza	MC74VHC257
Descripción	Quad 2-Channel Multiplexer
Fabricantes	ON Semiconductor
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No Preview Available ! MC74VHC257 Quad 2−Channel Multiplexer with 3−State Outputs The MC74VHC257 is an advanced high speed CMOS quad 2−channel multiplexer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation. It consists of four 2−input digital multiplexers with common select (S) and enable (OE) inputs. When (OE) is held High, selection of data is inhibited and all the outputs go Low. The select decoding determines whether the A or B inputs get routed to the corresponding Y outputs. The inputs tolerate voltages up to 7 V, allowing the interface of 5 V systems to 3 V systems. • High Speed: tPD = 4.1 ns (Typ) at VCC = 5.0 V • Low Power Dissipation: ICC = 4.0 mA (Max) at TA = 25°C • High Noise Immunity: VNIH = VNIL = 28% VCC • Power Down Protection Provided on Inputs • Balanced Propagation Delays • Designed for 2.0 V to 5.5 V Operating Range • Low Noise: VOLP = 0.8 V (Max) • Pin and Function Compatible with Other Standard Logic Families • Latchup Performance Exceeds 300 mA www.DataSheet4U.com • ESD Performance: HBM > 2000 V; Machine Model > 200 V • Chip Complexity: FETs = 100; Equivalent Gates = 25 S1 A0 2 B0 3 Y0 4 A1 5 B1 6 Y1 7 GND 8 16 VCC 15 OE 14 A3 13 B3 12 Y3 11 A2 10 B2 9 Y2 Figure 1. Pin Assignment http://onsemi.com MARKING DIAGRAMS SO−16 D SUFFIX CASE 751B 16 9 VHC257 AWLYWW 18 TSSOP−16 DT SUFFIX CASE 948F 16 9 VHC257 ALYW 18 16 9 EIAJ SO−16 M SUFFIX CASE 966 VHC257 ALYW 18 A L, WL Y W, WW = Assembly Location = Wafer Lot = Year = Work Week ORDERING INFORMATION Device MC74VHC257D MC74VHC257DR2 Package SO−16 SO−16 Shipping† 48 Units/Rail 2500 Tape & Reel MC74VHC257DT TSSOP−16 96 Units/Rail MC74VHC257DTR2 TSSOP−16 2500 Tape & Reel MC74VHC257M EIAJSO−16 50 Units/Rail MC74VHC257MEL EIAJSO−16 2000 Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. © Semiconductor Components Industries, LLC, 2004 September, 2004 − Rev. 3 1 Publication Order Number: MC74VHC257/D 1 page MC74VHC257 NOISE CHARACTERISTICS (Input tr = tf = 3.0 ns, CL = 50 pF, VCC = 5.0 V) Symbol VOLP VOLV VIHD VILD Characteristic Quiet Output Maximum Dynamic VOL Quiet Output Minimum Dynamic VOL Minimum High Level Dynamic Input Voltage Maximum Low Level Dynamic Input Voltage VCC A, B or S 50% GND tPLH tPHL Y 50% VCC OE Y Y TA = 25°C Typ Max 0.3 0.8 − 0.3 − 0.8 3.5 1.5 Unit V V V V 50% tPZL tPLZ 50% VCC tPZH tPHZ 50% VCC VCC GND HIGH IMPEDANCE VOL + 0.3V VOH − 0.3V HIGH IMPEDANCE Figure 5. Switching Waveform Figure 6. Switching Waveform DEVICE UNDER TEST TEST POINT OUTPUT CL* Includes all probe and jig capacitance Figure 7. Test Circuit DEVICE UNDER TEST TEST POINT OUTPUT 1 kΩ CL CONNECT TO VCC WHEN TESTING tPLZ AND tPZL. CONNECT TO GND WHEN TESTING tPHZ AND tPZH. *Includes all probe and jig capacitance Figure 8. Test Circuit INPUT Figure 9. Input Equivalent Circuit http://onsemi.com 5 5 Page

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