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 ■ Typical propagation delay Data select to Y: 26 ns ■ Wide supply range: 2–6V ■ Low power supply quiescent current: 80 µA maximum (74HC) ■ 3-STATE outputs for interface to bus oriented systems Ordering Code: Order Number MM74HC251M MM74HC251SJ MM74HC251MTC MM74HC251N Package Number Package Description M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150” Narrow M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MTC16 N16E 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 8-Channel 3-STATE Multiplexer September 1983 MM74HC251 Truth Table Inputs Select Outputs Strobe W B A S 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 H = HIGH Logic Level, L = LOW Logic Level X = Irrelevant, Z = High Impedance (off) D0, D1. . . D7 = The level of the respective D input Logic Diagram www.fairchildsemi.com Y C 2 Recommended Operating Conditions −0.5 to +7.0V Supply Voltage (VCC) DC Input Voltage (VIN) −1.5 to VCC +1.5V DC Output Voltage (VOUT) −0.5 to VCC +0.5V Clamp Diode Current (IIK, IOK) ±20 mA DC Output Current, per pin (IOUT) ±25 mA Max Units 2 6 V 0 VCC V −40 +85 °C (tr, tf) VCC = 2.0V 1000 ns VCC = 4.5V 500 ns VCC = 6.0V 400 ns DC Input or Output Voltage (VIN, VOUT) Operating Temperature Range (TA) ±50 mA DC VCC or GND Current, per pin (ICC) Storage Temperature Range (TSTG) Min Supply Voltage (VCC) Input Rise or Fall Times −65°C to +150°C Power Dissipation (PD) (Note 3) 600 mW S.O. Package only 500 mW Note 1: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Lead Temperature (TL) (Soldering 10 seconds) DC Electrical Characteristics Symbol VIH VIL VOH Parameter Note 2: Unless otherwise specified all voltages are referenced to ground. 260°C Note 3: Power Dissipation temperature derating — plastic “N” package: − 12 mW/°C from 65°C to 85°C. (Note 4) Conditions VCC TA = 25°C Typ TA = −40 to 85°C TA = −55 to 125°C Guaranteed Limits Units Minimum HIGH Level 2.0V 1.5 1.5 1.5 V Input Voltage 4.5V 3.15 3.15 3.15 V 6.0V 4.2 4.2 4.2 V Maximum LOW Level 2.0V 0.5 0.5 0.5 V Input Voltage 4.5V 1.35 1.35 1.35 V 6.0V 1.8 1.8 1.8 V Minimum HIGH Level VIN = VIH or VIL Output Voltage |IOUT| ≤ 20 µA 2.0V 2.0 1.9 1.9 1.9 V 4.5V 4.5 4.4 4.4 4.4 V 6.0V 6.0 5.9 5.9 5.9 V |IOUT| ≤ 4.0 mA 4.5V 4.2 3.98 3.84 3.7 V |IOUT| ≤ 5.2 mA 6.0V 5.7 5.48 5.34 5.2 V VIN = VIH or VIL VOL Maximum LOW Level VIN = VIH or VIL Output Voltage |IOUT| ≤ 20 µA 2.0V 0 0.1 0.1 0.1 V 4.5V 0 0.1 0.1 0.1 V 6.0V 0 0.1 0.1 0.1 V |IOUT| ≤ 4.0 mA 4.5V 0.2 0.26 0.33 0.4 V |IOUT| ≤ 5.2 mA 6.0V 0.2 0.26 0.33 0.4 V VIN = VCC or GND 6.0V ±0.1 ±1.0 ±1.0 µA 6.0V ±0.5 ±5 ±10 µA 6.0V 8.0 80 160 µA VIN = VIH or VIL IIN Maximum Input IOZ Maximum 3-STATE Strobe = VCC Leakage Current VOUT = VCC or GND Current ICC Maximum Quiescent VIN = VCC or GND Supply Current IOUT = 0 µA 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 Absolute Maximum Ratings(Note 1) (Note 2) MM74HC251 AC Electrical Characteristics VCC = 5V, TA = 25°C, CL = 15 pF, tr = tf = 6 ns Symbol tPHL, tPLH Parameter Conditions Guaranteed Typ Maximum Propagation Delay Units Limit 26 35 ns 27 35 ns 22 29 ns 24 32 ns 19 27 ns 19 26 ns 26 40 ns 27 35 ns A, B or C to Y tPHL, tPLH Maximum Propagation Delay, A, B or C to W tPHL, tPLH Maximum Propagation Delay, Any D to Y tPHL, tPLH Maximum Propagation Delay, Any D to W tPZH, tPZL tPZH, tPZL tPHZ, tPLZ tPHZ, tPLZ Maximum Output Enable RL = 1 kΩ Time, W Output CL = 50 pF Maximum Output Enable RL = 1 kΩ Time, Y Output CL = 50 pF Maximum Output Disable Time RL = 1 kΩ W Output CL = 5 pF Maximum Output Disable Time RL = 1 kΩ Y Output CL = 5 pF AC Electrical Characteristics CL = 50 pF, tr = tf = 6 ns (unless otherwise specified) Symbol Parameter Conditions tPHL, tPLH Maximum Propagation Delay A, B or C to Y tPHL, tPLH Maximum Propagation Delay, A, B or C to W tPHL, tPLH Maximum Propagation Delay, any D to Y tPHL, tPLH Maximum Propagation Delay, any D to W tPZH, tPZL Maximum Output Enable Time RL = 1 kΩ W Output tPZH, tPZL Maximum Output Enable Time RL = 1 kΩ Y Output tPHZ, tPLZ Maximum Output Disable Time RL = 1 kΩ W Output tPHZ, tPLZ Maximum Output Disable Time RL = 1 kΩ Y Output tTHL, tTLH Maximum Output Rise and Fall Time CPD Power Dissipation Capacitance (Note 5) (per package) CIN Maximum Input Capacitance VCC TA = 25°C Typ TA = −40 to 85°C TA = −55 to 125°C 90 205 256 300 ns 4.5V 31 41 51 60 ns 6.0V 26 35 44 51 ns 2.0V 95 205 256 300 ns 4.5V 32 41 51 60 ns 6.0V 27 35 44 51 ns 2.0V 70 195 244 283 ns 4.5V 27 39 49 57 ns 6.0V 23 33 41 48 ns 2.0V 75 185 231 268 ns 4.5V 29 37 46 54 ns 6.0V 25 32 40 46 ns 2.0V 45 150 188 218 ns 4.5V 21 30 38 44 ns 6.0V 18 26 33 38 ns 2.0V 45 145 181 210 ns 4.5V 21 29 36 42 ns 6.0V 18 25 31 36 ns 2.0V 60 220 275 319 ns 4.5V 29 44 55 64 ns 6.0V 25 37 46 54 ns 2.0V 60 195 244 283 ns 4.5V 30 39 49 57 ns 6.0V 26 33 41 48 ns ns 2.0V 30 75 95 110 4.5V 8 15 19 22 ns 6.0V 7 13 16 19 ns 10 10 10 110 5 pF Note 5: CPD determines the no load dynamic power consumption, PD = CPD VCC2 f + ICC VCC, and the no load dynamic current consumption, IS = CPD VCC f + ICC. www.fairchildsemi.com Units Guaranteed Limits 2.0V 4 pF MM74HC251 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Package Number M16A 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 5 www.fairchildsemi.com MM74HC251 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 www.fairchildsemi.com 6 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide Package Number N16A LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the www.fairchildsemi.com user. Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. MM74HC251 8-Channel 3-STATE Multiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued)