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| TECHNICAL DATA 8-Input Data Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS The IN74ACT251 is identical in pinout to the LS/ALS251, HC/HCT251. The IN74ACT251 may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. The device selects one of the eight binary Data Inputs, as determined by the Address Inputs. The Output Enable pin must be at a low level for the selected data to appear at the outputs. If Output Enable is high, the Y and the Y outputs are in the high-impedance state. This 3-State feature allows the IN74ACT251 to be used in bus-oriented systems. * TTL/NMOS Compatible Input Levels * Outputs Directly Interface to CMOS, NMOS, and TTL * Operating Voltage Range: 4.5 to 5.5 V * Low Input Current: 1.0 A; 0.1 A @ 25C * Outputs Source/Sink 24 mA IN74ACT251 ORDERING INFORMATION IN74ACT251N Plastic IN74ACT251D SOIC TA = -40 to 85 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs A2 X L L L L H PIN 16 =VCC PIN 8 = GND H H A1 X L L H H L L H A0 X L H L H L H L Output Enable H L L L L L L L Outputs Y Z D0 D1 D2 D3 D4 D5 D6 Y Z D0 D1 D2 D3 D4 D5 D6 HH H L D7 D7 D0,D1...D7=the level of the respective D input Z = high-impedance state X = don't care Rev. 00 IN74ACT251 MAXIMUM RATINGS* Symbol VCC VIN VOUT IIN IOUT ICC PD Tstg TL * Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Current, per Pin DC Supply Current, VCC and GND Pins Power Dissipation in Still Air, Plastic DIP+ SOIC Package+ Storage Temperature Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package) Value -0.5 to +7.0 -0.5 to VCC +0.5 -0.5 to VCC +0.5 20 50 50 750 500 -65 to +150 260 Unit V V V mA mA mA mW C C Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. +Derating - Plastic DIP: - 10 mW/C from 65 to 125C SOIC Package: : - 7 mW/C from 65 to 125C RECOMMENDED OPERATING CONDITIONS Symbol VCC VIN, VOUT TJ TA IOH IOL tr, tf * Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage, Output Voltage (Referenced to GND) Junction Temperature (PDIP) Operating Temperature, All Package Types Output Current - High Output Current - Low Input Rise and Fall Time (except Schmitt Inputs) * Min 4.5 0 -40 Max 5.5 VCC 140 +85 -24 24 Unit V V C C mA mA ns/V VCC =4.5 V VCC =5.5 V 0 0 10 8.0 VIN from 0.8 V to 2.0 V This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range GND(VIN or VOUT)VCC. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open. Rev. 00 IN74ACT251 DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND) VCC Symbol VIH VIL VOH Parameter Minimum HighLevel Input Voltage Maximum Low Level Input Voltage Minimum HighLevel Output Voltage Test Conditions VOUT=0.1 V or VCC-0.1 V VOUT=0.1 V or VCC-0.1 V IOUT -50 A VIN=VIH or VIL IOH=-24 mA IOH=-24 mA VOL Maximum LowLevel Output Voltage IOUT 50 A * * Guaranteed Limits 25 C 2.0 2.0 0.8 0.8 4.4 5.4 3.86 4.86 0.1 0.1 0.36 0.36 0.1 -40C to 85C 2.0 2.0 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 1.0 1.5 0.5 5.0 A mA A V Unit V V V V 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 5.5 5.5 5.5 VIN=VIH or VIL IOL=24 mA IOL=24 mA VIN=VCC or GND VIN=VCC - 2.1 V IIN ICCT IOZ Maximum Input Leakage Current Additional Max. ICC/Input Maximum ThreeState Leakage Current +Minimum Dynamic Output Current +Minimum Dynamic Output Current Maximum Quiescent Supply Current (per Package) VIN (OE)= VIH or VIL VIN =VCC or GND VOUT =VCC or GND VOLD=1.65 V Max VOHD=3.85 V Min VIN=VCC or GND IOLD IOHD ICC 5.5 5.5 5.5 8.0 75 -75 80 mA mA A * All outputs loaded; thresholds on input associated with output under test. +Maximum test duration 2.0 ms, one output loaded at a time. Rev. 00 IN74ACT251 AC ELECTRICAL CHARACTERISTICS (VCC=5.0 V 10%, CL=50pF, Input tr=tf=3.0 ns) Guaranteed Limits Symbol tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ CIN Parameter Propagation Delay, Input A to Output Y or Y (Figure 3) Propagation Delay, Input A to Output Y or Y (Figure 3) Propagation Delay, Input D to Output Y or Y (Figures 1,2) Propagation Delay, Input D to Output Y or Y (Figures 1,2) Propagation Delay, Output Enable to Output Y or Y (Figure 4) Propagation Delay, Output Enable to Output Y or Y (Figure 4) Propagation Delay, Output Enable to Output Y or Y (Figure 4) Propagation Delay, Output Enable to Output Y or Y (Figure 4) Maximum Input Capacitance 25 C Min 2.5 2.5 2.5 2.5 1.5 1.5 2.0 1.5 4.5 Max 15.5 16.5 12.0 12.5 8.5 8.5 12.0 8.5 -40C to 85C Min 2.0 2.5 2.0 2.5 1.5 1.5 2.0 1.5 4.5 Max 17.0 18.5 13.0 14.0 9.0 9.5 13.0 9.0 ns ns ns ns ns ns ns ns pF Unit Typical @25C,VCC=5.0 V CPD Power Dissipation Capacitance 70 pF Figure 1. Switching Waveforms Figure 2. Switching Waveforms Rev. 00 IN74ACT251 Figure 3. Switching Waveforms Figure 4. Switching Waveforms EXPANDED LOGIC DIAGRAM Rev. 00 IN74ACT251 N SUFFIX PLASTIC DIP (MS - 001BB) A Dimension, mm 16 9 B Symbol A MIN 18.67 6.1 MAX 19.69 7.11 5.33 1 8 B C F L D F 0.36 1.14 2.54 7.62 0 2.92 7.62 0.2 0.38 0.56 1.78 C -T- SEATING PLANE G H H J N G D 0.25 (0.010) M T K M J K L M N 10 3.81 8.26 0.36 NOTES: 1. Dimensions "A", "B" do not include mold flash or protrusions. Maximum mold flash or protrusions 0.25 mm (0.010) per side. D SUFFIX SOIC (MS - 012AC) Dimension, mm A 16 9 Symbol A MIN 9.8 3.8 1.35 0.33 0.4 1.27 5.72 0 0.1 0.19 5.8 0.25 MAX 10 4 1.75 0.51 1.27 H B P B C 1 G 8 C R x 45 D F G -TD 0.25 (0.010) M T C M K SEATING PLANE J F M H J K M P R 8 0.25 0.25 6.2 0.5 NOTES: 1. Dimensions A and B do not include mold flash or protrusion. 2. Maximum mold flash or protrusion 0.15 mm (0.006) per side for A; for B 0.25 mm (0.010) per side. Rev. 00 |
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