MM74HC85J

MM54HC85 MM74HC85 4-Bit Magnitude Comparator November 1995 MM54HC85 MM74HC85 4-Bit Magnitude Comparator General Description The MM54HC85 MM74HC85 is a 4-bit magnitude comparator that utilizes advanced silicon-gate CMOS technology It is designed for high speed comparison of two four bit words This circuit has eight comparison inputs 4 for each word three cascade inputs (AkB AlB A e B) and three decision outputs (AkB AlB A e B) The result of a comparison is indicated by a high level on one of the decision outputs Thus it may be determined whether one word is ‘‘greater than ’’ ‘‘less than ’’ or ‘‘equal to’’ the other word By connecting the outputs of the least significant stage to the cascade inputs of the next stage words of greater than four bits can be compared In addition the least significant stage must have a high level applied to the A e B input and a low level to the A kB and AlB inputs The comparator’s outputs can drive 10 low power Schottky TTL (LS-TTL) equivalent loads and is functionally and pin equivalent to the 54LS85 74LS85 All inputs are protected from damage due to static discharge by diodes to VCC and ground Features Y Y Y Y Y Typical propagation delay 27 ns Wide operating voltage range 2 – 6V Low input current 1 mA maximum Low quiescent current 80 mA maximum (74HC Series) Output drive capability 10 LS-TTL loads Connection Diagram Dual-In-Line Package TL F 5205 – 1 Order Number MM54HC85 or MM74HC85 Truth Table Comparing Inputs A3 B3 A3 l B3 A3 k B3 A3 e B3 A3 e B3 A3 e B3 A3 e B3 A3 e B3 A3 e B3 A3 e B3 A3 e B3 A3 e B3 A3 e B3 A3 e B3 A2 B2 X X A2 l B2 A2 k B2 A2 e B2 A2 e B2 A2 e B2 A2 e B2 A2 e B2 A2 e B2 A2 e B2 A2 e B2 A2 e B2 A1 B1 X X X X A1 l B1 A1 k B1 A1 e B1 A1 e B1 A1 e B1 A1 e B1 A1 e B1 A1 e B1 A1 e B1 A0 B0 X X X X X X A0 l B0 A0 k B0 A0 e B0 A0 e B0 A0 e B0 A0 e B0 A0 e B0 AlB X X X X X X X X H L X H L Cascading Inputs AkB X X X X X X X X L H X H L AeB X X X X X X X X L L H L L AlB H L H L H L H L H L L L H Outputs AkB L H L H L H L H L H L L H AeB L L L L L L L L L L H L L C1995 National Semiconductor Corporation TL F 5205 RRD-B30M115 Printed in U S A Absolute Maximum Ratings (Notes 1 2) Operating Conditions Min Supply Voltage VCC DC Input or Output Voltage VIN VOUT Operating Temp Range (TA) MM HC MM HC Input Rise or Fall Times VCC e V tr tf VCC e V VCC e V b b If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications b 0 5 to a 7 0V Supply Voltage (VCC) b 1 5 to VCC a 1 5V DC Input Voltage (VIN) b 0 5 to VCC a 0 5V DC Output Voltage (VOUT) g 20 mA Clamp Diode Current (IIK IOK) g 25 mA DC Output Current per pin (IOUT) g 50 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 Temp (TL) (Soldering 10 seconds) 260 C Max VCC Units V V a a C C ns ns ns DC Electrical Characteristics (Note 4) Symbol Parameter Conditions VCC V V V V V V VIN e VIH or VIL lIOUTl s mA V V V V V V V V V V V V g g g TA e 25 C Typ 74HC TA eb40 to 85 C 54HC TA eb55 to 125 C Units Guaranteed Limits V V V V V V V V V V V V V V V V mA mA VIH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage VIL VOH VIN e VIH or VIL lIOUTl s mA lIOUTl s mA VOL Maximum Low Level Output Voltage VIN e VIH or VIL lIOUTl s mA VIN e VIH or VIL lIOUTl s mA lIOUTl s mA IIN ICC Maximum Input Current Maximum Quiescent Supply Current VIN e VCC or GND VIN e VCC or GND IOUT e mA 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 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 For a power supply of 5V g 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 e 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 VIL limits are currently tested at 20% of VCC The above VIL specification (30% of VCC) will be implemented no later than Q1 CY’89 2 AC Electrical Characteristics VCC e 5V Symbol tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH Parameter TA e 25 C CL e 15 pF tr e tf e 6 ns Conditions Typ Limit Units ns ns ns ns Maximum Propagation Delay Data Input to AkB or AlB Maximum Propagation Delay A e B Input to A e B Output Maximum Propagation Delay Cascade Input to Output Maximum Propagation Delay Data Input to A e B AC Electrical Characteristics CL e 50 pF Symbol tPHL tPLH Parameter Maximum Propagation Delay Data Input to Output Maximum Propagation Delay Data Input to A e B Output Maximum Propagation Delay A e B Input to A e B Output Maximum Propagation Delay Cascade Input to Output except A e B Maximum Output Rise and Fall Time Maximum Input Capacitance Power Dissipation Capacitance Note Conditions tr e tf e 6 ns (unless otherwise specified) TA e 25 C Typ V V V V V V V V V V V V V V V 74HC TA eb40 to 85 C 54HC TA eb55 to 125 C Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns pF pF VCC Guaranteed Limits tPHL tPLH tPHL tPLH tPHL tPLH tTLH tTHL CIN CPD Note 5 CPD determines the no load dynamic power consumption PD e CPD VCC2 f a ICC VCC and the no load dynamic current consumption IS e CPD VCC f a ICC Typical Application Cascading Comparators TL F 5205 – 4 3 Logic Diagram TL F 5205 – 3 4 5 MM54HC85 MM74HC85 4-Bit Magnitude Comparator Physical Dimensions inches (millimeters) Order Number MM54HC85J or MM74HC85J NS Package J16A Order Number MM74HC85N NS Package 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 Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure 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 user National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 2 A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness National Semiconductor Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 Italiano Tel (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications