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M74HC148 데이터시트(PDF) 1 Page - STMicroelectronics |
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M74HC148 데이터시트(HTML) 1 Page - STMicroelectronics |
1 / 11 page M54HC148 M74HC148 October 1992 8 TO 3 LINE PRIORITY ENCODER B1R (Plastic Package) ORDER CODES : M54HC148F1R M74HC148M1R M74HC148B1R M74HC148C1R F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) PIN CONNECTIONS (top view) NC = No Internal Connection INPUT AND OUTPUT EQUIVALENT CIRCUIT DESCRIPTION . HIGH SPEED tPD = 15 ns (TYP.) AT VCC =5 V . LOW POWER DISSIPATION ICC =4 µA (MAX.) AT TA =25 °C . HIGH NOISE IMMUNITY VNIH =VNIL =28 % VCC (MIN.) . OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS . SYMMETRICAL OUTPUT IMPEDANCE I OH =IOL = 4 mA (MIN.) . BALANCED PROPAGATION DELAYS tPLH =tPHL . WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V TO 6 V . PIN AND FUNCTION COMPATIBLE WITH 54/74LS148 The M54/74HC148 is a high speed CMOS 8-TO-3 LINE PRIORITY ENCODER fabricated in silicon gate C 2MOS technology. It has the same high speed performance for LSTTL combined with true CMOS low power consumption. The M54/74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO) has been provided to allow octal expansion without the need for external circuitry. Data inputs are active at the low logic level. All inputs are equipped with protection circuits against static discharge and transient excess volt- age. 1/11 |
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