November 1995 MM54HCT147/MM74HCT147 10-to-4 Line Priority Encoder General Description This priority encoder utilizes advanced silicon-gate CMOS technology. It has the high noise immunity and low power consumption typical of CMOS circuits, as well as the speeds and output drive similar to LS-TTL. This priority encoder accepts 9 input request lines 1– 9 and outputs 4 line BCD. The priority encoding ensures that only the highest order data line is encoded. The implied decimal zero condition requires no input condition as zero is encoded when all nine data lines are at a high logic level. All data inputs and outputs are active at low logic level. All inputs are protected from damage due to static discharge by internal diode clamps to VCC and ground. MM54HCT/MM74HCT devices are intended to interface between TTL and NMOS components and standard CMOS devices. These parts are also plug in replacements for LSTTL devices and can be used to reduce power comsumption in existing designs. Features Y Y Y Low quiescent power consumption: 40 mW maximum at 25§ C High speed: 13 ns propagation delay (typical) Very low input current: 10b5 mA typical Connection and Logic Diagrams Dual-In-Line Package TL/F/9397 – 1 Order Number MM54HCT147 or MM74HCT147 Truth Table Inputs Outputs 1 2 3 4 5 6 7 8 9 D C B A H X X X X X X X X L H X X X X X X X L H H X X X X X X L H H H X X X X X L H H H H X X X X L H H H H H X X X L H H H H H H X X L H H H H H H H X L H H H H H H H H L H H H H H H H H H L L H H H H H H H H H H L L L L H H H H H H L L H H L L H H L H L H L H L H L TL/F/9397 – 2 H e High Logic Level, L e Low Logic Level, X e Irrelevant C1995 National Semiconductor Corporation TL/F/9397 RRD-B30M115/Printed in U. S. A. MM54HCT147/MM74HCT147 10-to-4 Line Priority Encoder PRELIMINARY Absolute Maximum Ratings (Notes 1 & 2) Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage (VCC) Supply Voltage (VCC) DC Input or Output Voltage (VIN, VOUT) b 0.5V to a 7.0V b 1.5V to VCC a 1.5V DC Input Voltage (VIN) b 0.5V to VCC a 0.5V DC Output Voltage (VOUT) g 20 mA Clamp Diode Current (IIK, IOK) g 35 mA DC Output Current, per pin (IOUT) g 75 mA DC VCC or GND Current, per pin (ICC) b 65§ C to a 150§ C Storage Temperature Range (TSTG) Power Dissipation (PD) (Note 3) 600 mW S.O. Package only 500 mW Lead Temperature (TL) (Soldering 10 seconds) 260§ C Operating Temp. Range (TA) MM74HCT MM54HCT Min 2 Max 6 Units V 0 VCC V b 40 b 55 a 85 a 125 §C §C 500 ns Input Rise or Fall Times (tr, tf) DC Electrical Characteristics VCC e 5V g 10% (unless otherwise specified) Symbol Parameter 74HCT 54HCT TA eb40§ C to a 85§ C TA eb55§ C to a 125§ C Units Guaranteed Limits TA e 25§ C Conditions Typ VIH Minimum High Level Input Voltage 2.0 2.0 2.0 V VIL Maximum Low Level Input Voltage 0.8 0.8 0.8 V VOH Minimum High Level VIN e VIH or VIL Output Voltage VCC VCCb0.1 lIOUTl e 20 mA lIOUTl e 4.0 mA, VCC e 4.5V 4.2 3.98 lIOUTl e 4.8 mA, VCC e 5.5V 5.7 4.98 VCCb0.1 3.84 4.84 VCCb0.1 3.7 4.7 V V V VOL Maximum Low Level VIN e VIH or VIL Output Voltage 0 lIOUTl e 20 mA lIOUTl e 4.0 mA, VCC e 4.5V 0.2 lIOUTl e 4.8 mA, VCC e 5.5V 0.2 0.1 0.26 0.26 0.1 0.33 0.33 0.1 0.4 0.4 V V V IIN Maximum Input Current g 0.1 g 1.0 g 1.0 mA ICC Maximum Quiescent VIN e VCC or GND Supply Current IOUT e 0 mA 8.0 80 160 mA 2.0 2.9 3.0 mA VIN e VCC or GND, VIH or VIL VIN e 2.4V or 0.5V (Note 4) AC Electrical Characteristics VCC e 5V g 10%, CL e 50 pF, tr e tf e 6 ns (unless otherwise specified) Symbol TA e 25§ C Parameter 74HCT 54HCT b 40§ C to a 85§ C b 55§ C to a 125§ C Typ tPD Maximum Propagation Delay tr, tf Maximum Output Rise and Fall Time CPD Power Dissipation Capacitance (Note 5) CIN Maximum Input Capacitance Units Guaranteed Limits 7 22 28 33 11 14 17 TBD ns ns pF 5 10 10 10 pF AC Electrical Characteristics VCC e 5V, TA e 25§ C, CL e 15 pF, tr e tf e 6 ns Symbol TA e 25§ C Parameter Typ tPD Maximum Propagation Delay 74HCT 54HCT b 40§ C to a 85§ C b 55§ C to a 125§ C Units Guaranteed Limits 11 ns 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 Ð plastic ‘‘N’’ package: b 12 mW/§ C from 65§ C to 85§ C; ceramic ‘‘J’’ package: b 12 mW/§ C from 100§ C to 125§ C. Note 4: Measured per input, other inputs held at VCC or GND. Note 5: CPD determines the no load dynamic power consumption, and the no load dynamic current consumption. 2 Schematic Diagram TL/F/9397 – 3 3 MM54HCT147/MM74HCT147 10-to-4 Line Priority Encoder Physical Dimensions inches (millimeters) Ceramic Dual-In-Line Package (J) Order Number MM54HCT147J or MM74HCT147J NS Package Number J16A Molded Dual-In-Line Package (N) Order Number MM74HC147N NS Package Number N16E LIFE SUPPORT POLICY NATIONAL’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 NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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