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| SL74HCT157 Quad 2-Input Data Selectors/Multiplexer High-Performance Silicon-Gate CMOS The SL74HCT157 is identical in pinout to the LS/ALS157. This device may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. This device routes 2 nibbles (A or B) to a single port (Y) as determined by the Select input. The data is presented at the outputs in noninvertered form. A high level on the Output Enable input sets all four Y outputs to a low level. * 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 ORDERING INFORMATION SL74HCT157N Plastic SL74HCT157D SOIC TA = -55 to 125 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs Output Enable PIN 16 =VCC PIN 8 = GND H L L Select X L H Outputs Y0-Y3 L A0-A3 B0-B3 X=don't care A0-A3,B0-B3=the levels of the respective Data-Word Inputs SLS System Logic Semiconductor SL74HCT157 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 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 -1.5 to VCC +1.5 -0.5 to VCC +0.5 20 25 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 TA tr, t f Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage, Output Voltage (Referenced to GND) Operating Temperature, All Package Types Input Rise and Fall Time (Figure 1 Min 4.5 0 -55 0 Max 5.5 VCC +125 500 Unit V V C ns 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 V ). CC Unused outputs must be left open. SLS System Logic Semiconductor SL74HCT157 DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND) VCC Symbol Parameter Test Conditions V Guaranteed Limit 25 C to -55C 2.0 2.0 0.8 0.8 4.4 5.4 3.98 0.1 0.1 0.26 0.1 4.0 85 C 2.0 2.0 0.8 0.8 4.4 5.4 3.84 0.1 0.1 0.33 1.0 40 125 C 2.0 2.0 0.8 0.8 4.4 5.4 3.7 0.1 0.1 0.4 1.0 160 A A V Unit VIH VIL VOH Minimum High-Level Input Voltage Maximum Low -Level Input Voltage Minimum High-Level Output Voltage VOUT=0.1 V or VCC-0.1 V IOUT 20 A VOUT=0.1 V or VCC-0.1 V IOUT 20 A VIN=VIH or VIL IOUT 20 A VIN=VIH or VIL IOUT 4.0 mA 4.5 5.5 4.5 5.5 4.5 5.5 4.5 4.5 5.5 4.5 5.5 5.5 V V V VOL Maximum Low-Level Output Voltage VIN=VIH or VIL IOUT 20 A VIN=VIH or VIL IOUT 4.0 mA IIN ICC Maximum Input Leakage Current Maximum Quiescent Supply Current (per Package) Additional Quiescent Supply Current VIN=VCC or GND VIN=VCC or GND IOUT=0A VIN=2.4 V, Any One Input VIN=VCC or GND, Other Inputs IOUT=0A ICC -55C 25C to 125C 2.4 mA 5.5 2.9 SLS System Logic Semiconductor SL74HCT157 AC ELECTRICAL CHARACTERISTICS(VCC =5.0 V 10%, CL=50pF,Input t r=t f=6.0 ns) Guaranteed Limit Symbol tPLH, t PHL tPLH, t PHL tPLH, t PHL tTLH, t THL CIN Parameter Maximum Propagation Delay, Input A or B to Output Y (Figures 1and 4) Maximum Propagation Delay , Select to Output Y (Figures 2 and 4) Maximum Propagation Delay , Output Enable to Output Y (Figures 3 and 4) Maximum Output Transition Time, Any Output (Figures 1 and 4) Maximum Input Capacitance Power Dissipation Capacitance (Per Transceiver Channel) CPD Used to determine the no-load dynamic power consumption: PD=CPDVCC2f+ICCVCC 25 C to -55C 27 37 30 15 10 85C 34 46 38 19 10 125C 41 56 45 22 10 Unit ns ns ns ns pF Typical @25C,VCC=5.0 V 64 pF Figure 1. Switching Waveforms Figure 2. Switching Waveforms Figure 3. Switching Waveforms Figure 4. Test Circuit SLS System Logic Semiconductor SL74HCT157 EXPANDED LOGIC DIAGRAM SLS System Logic Semiconductor |
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