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MM74HC251 Dataheets PDF



Part Number MM74HC251
Manufacturers Fairchild
Logo Fairchild
Description 8-Channel 3-STATE Multiplexer
Datasheet MM74HC251 DatasheetMM74HC251 Datasheet (PDF)

MM74HC251 8-Channel 3-STATE Multiplexer September 1983 Revised February 1999 MM74HC251 8-Channel 3-STATE Multiplexer General Description The MM74HC251 8-channel digital multiplexer with 3STATE outputs utilizes advanced silicon-gate CMOS technology. Along with the high noise immunity and low power consumption of standard CMOS integrated circuits, it possesses the ability to drive 10 LS-TTL loads. The large output drive capability and 3-STATE feature make this part ideally suited for interfacing.

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MM74HC251 8-Channel 3-STATE Multiplexer September 1983 Revised February 1999 MM74HC251 8-Channel 3-STATE Multiplexer General Description The MM74HC251 8-channel digital multiplexer with 3STATE outputs utilizes advanced silicon-gate CMOS technology. Along with the high noise immunity and low power consumption of standard CMOS integrated circuits, it possesses the ability to drive 10 LS-TTL loads. The large output drive capability and 3-STATE feature make this part ideally suited for interfacing with bus lines in a bus oriented system. This multiplexer features both true (Y) and complement (W) outputs as well as a STROBE input. The STROBE must be at a low logic level to enable this device. When the STROBE input is HIGH, both outputs are in the high impedance state. When enabled, address information on the data select inputs determines which data input is routed to the Y and W outputs. The 74HC logic family is speed, function, as well as pinout compatible with the standard 74LS logic family. All inputs are protected from damage due to static discharge by internal diode clamps to VCC and ground. Features s Typical propagation delay Data select to Y: 26 ns s Wide supply range: 2–6V s Low power supply quiescent current: 80 µA maximum (74HC) s 3-STATE outputs for interface to bus oriented systems Ordering Code: Order Number MM74HC251M MM74HC251SJ MM74HC251MTC MM74HC251N Package Number M16A M16D MTC16 N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Pin Assignments for DIP, SOIC, SOP and TSSOP Top View © 1999 Fairchild Semiconductor Corporation DS005328.prf www.fairchildsemi.com MM74HC251 Truth Table Inputs Select C X L L L L H H H H H = HIGH Logic Level, L = LOW Logic Level X = Irrelevant, Z = High Impedance (off) D0, D1. . . D7 = The level of the respective D input Outputs Strobe S H L L L L L L L L Y Z D0 D1 D2 D3 D4 D5 D6 D7 W Z D0 D1 D2 D3 D4 D5 D6 D7 B X L L H H L L H H A X L H L H L H L H Logic Diagram www.fairchildsemi.com 2 MM74HC251 Absolute Maximum Ratings(Note 1) (Note 2) Supply Voltage (VCC) DC Input Voltage (VIN) DC Output Voltage (VOUT) Clamp Diode Current (IIK, IOK) DC Output Current, per pin (IOUT) DC VCC or GND Current, per pin (ICC) Storage Temperature Range (TSTG) Power Dissipation (PD) (Note 3) S.O. Package only Lead Temperature (TL) (Soldering 10 seconds) 260°C 600 mW 500 mW −0.5 to +7.0V −1.5 to VCC +1.5V −0.5 to VCC +0.5V ±20 mA ±25 mA ±50 mA −65°C to +150°C Recommended Operating Conditions Min Supply Voltage (VCC) DC Input or Output Voltage (VIN, VOUT) Operating Temperature Range (TA) Input Rise or Fall Times (tr, tf) VCC = 2.0V VCC = 4.5V VCC = 6.0V 1000 500 400 ns ns ns 0 −40 VCC +85 V °C 2 Max 6 Units V Note 1: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Note 2: Unless otherwise specified all voltages are referenced to ground. Note 3: Power Dissipation temperature derating — plastic “N” package: − 12 mW/°C from 65°C to 85°C. DC Electrical Characteristics Symbol VIH Parameter Minimum HIGH Level Input Voltage VIL Maximum LOW Level Input Voltage VOH Minimum HIGH Level Output Voltage VIN = VIH or VIL |IOUT| ≤ 20 µA Conditions (Note 4) VCC 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0 4.5 6.0 4.2 5.7 0 0 0 0.2 0.2 TA = 25°C Typ 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 3.98 5.48 0.1 0.1 0.1 0.26 0.26 ±0.1 ±0.5 8.0 TA = −40 to 85°C TA = −55 to 125°C Guaranteed Limits 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 3.84 5.34 0.1 0.1 0.1 0.33 0.33 ±1.0 ±5 80 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 3.7 5.2 0.1 0.1 0.1 0.4 0.4 ±1.0 ±10 160 Units V V V V V V V V V V V V V V V V µA µA µA VIN = VIH or VIL |IOUT| ≤ 4.0 mA |IOUT| ≤ 5.2 mA VOL Maximum LOW Level Output Voltage VIN = VIH or VIL |IOUT| ≤ 20 µA 2.0V 4.5V 6.0V VIN = VIH or VIL |IOUT| ≤ 4.0 mA |IOUT| ≤ 5.2 mA IIN IOZ ICC Maximum Input Current Maximum 3-STATE Leakage Current Maximum Quiescent Supply Current Strobe = VCC VOUT = VCC or GND VIN = VCC or GND IOUT = 0 µA 6.0V 6.0V VIN = VCC or GND 4.5V 6.0V 6.0V 4.5V 6.0V Note 4: For a power supply of 5V ±10% the worst case output voltages (VOH, and VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when designing with this supply. Worst case VIH and VIL occur at VCC = 5.5V and 4.5V respectively. (The VIH value at 5.5V is 3.85V.) The worst case leakage current (IIN, ICC, and IOZ) occur for CMOS at the higher voltage and so the 6.0V values should be used. 3 www.fairchildsemi.com MM74HC251 AC Electrical Characteristics VCC = 5V, TA = 25°C, CL = 15 pF, tr = tf = 6 ns Symbol tPHL, tPLH tPHL, tPLH tPHL, tPLH tPHL, tPLH tPZH, tPZL tPZH, tPZL tPHZ, tPLZ t.


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