54LS85LMQB

54LS85 DM54LS85 DM74LS85 4-Bit Magnitude Comparators June 1989 54LS85 DM54LS85 DM74LS85 4-Bit Magnitude Comparators General Description These 4-bit magnitude comparators perform comparison of straight binary or BCD codes Three fully-decoded decisions about two 4-bit words (A B) are made and are externally available at three outputs These devices are fully expandable to any number of bits without external gates Words of greater length may be compared by connecting comparators in cascade The A l B A k B and A e B outputs of a stage handling less-significant bits are connected to the corresponding inputs of the next stage handling more-significant bits The stage handling the least-significant bits must have a high-level voltage applied to the A e B input The cascading path is implemented with only a two-gate-level delay to reduce overall comparison times for long words Features Y Y Y Typical power dissipation 52 mW Typical delay (4-bit words) 24 ns Alternate Military Aerospace device (54LS85) is available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package Order Number 54LS85DMQB 54LS85FMQB 54LS85LMQB DM54LS85J DM54LS85W DM74LS85M or DM74LS85N See NS Package Number E20A J16A M16A N16E or W16A TL F 6379 – 1 Function Table Comparing Inputs A3 B3 A3 l B3 A3 k B3 A3 A3 A3 A3 A3 A3 A3 A3 A3 A3 A3 A3 e e e e e e e e e e e e Cascading Inputs 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 A0 e B0 AlB X X X X X X X X H L L X H L AkB X X X X X X X X L H L X H L AeB X X X X X X X X L L H H L L AlB H L H L H L H L H L L L L H Outputs AkB L H L H L H L H L H L L L H AeB L L L L L L L L L L H H L L 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 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 A1 e B1 B3 B3 B3 B3 B3 B3 B3 B3 B3 B3 B3 B3 H e High Level L e Low Level X e Don’t Care C1995 National Semiconductor Corporation TL F 6379 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55 C to a 125 C DM54LS and 54LS DM74LS 0 C to a 70 C Storage Temperature Range b 65 C to a 150 C Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ‘‘Electrical Characteristics’’ table are not guaranteed at the absolute maximum ratings The ‘‘Recommended Operating Conditions’’ table will define the conditions for actual device operation Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature b 55 DM54LS85 Nom 5 Max 55 Min 4 75 2 07 b0 4 DM74LS85 Nom 5 Max 5 25 Units V V 08 b0 4 45 2 V mA mA C 4 125 0 8 70 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Conditions VCC e Min II e b18 mA VCC e Min IOH e Max VIL e Max VIH e Min VCC e Min IOL e Max VIL e Max VIH e Min IOL e 4 mA VCC e Min II Input Current Input Voltage Max VCC e Max VI e 7V DM54 DM74 DM54 DM74 DM74 AkB AlB Others IIH High Level Input Current VCC e Max VI e 2 7V AkB AlB Others IIL Low Level Input Current VCC e Max VI e 0 4V AkB AlB Others IOS Short Circuit Output Current Supply Current VCC e Max (Note 2) VCC e Max (Note 3) DM54 DM74 b 20 b 20 Min Typ (Note 1) Max b1 5 Units V V 25 27 34 34 0 25 0 35 0 25 04 05 04 01 01 03 20 20 60 b0 4 b0 4 b1 2 b 100 b 100 VOL V mA mA mA mA mA ICC 10 20 Note 1 All typicals are at VCC e 5V TA e 25 C Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second Note 3 ICC is measured with all outputs open A e B grounded and all other inputs at 4 5V 2 Switching Characteristics at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter From Input To Output Number of Gate Levels RL e 2 kX CL e 15 pF Min tPLH Propagation Delay Time Low-to-High Level Output Any A or B Data Input AkB AlB AeB tPHL Propagation Delay Time High-to-Low Level Output Any A or B Data Input AkB AlB AeB tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay Time Low-to-High Level Output Propagation Delay Time High-to-Low Level Output Propagation Delay Time Low-to-High Level Output Propagation Delay Time High-to-Low Level Output Propagation Delay Time Low-to-High Level Output Propagation Delay Time High-to-Low Level Output AkB or A e B AkB or A e B A eB AeB AlB or A e B AlB or A e B AlB AlB AeB AeB AkB AkB 3 4 3 4 1 1 2 2 1 1 Max 36 40 30 30 22 17 20 17 22 17 CL e 50 pF Min Max 42 40 40 40 26 26 25 26 26 26 ns ns ns ns ns ns ns ns Units 3 Logic Diagram TL F 6379 – 2 4 5 Physical Dimensions inches (millimeters) Chip Carrier Package (E) Order Number 54LS85LMQB NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS85DMQB or DM54LS85J NS Package Number J16A 6 Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS85M NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS85N NS Package Number N16E 7 54LS85 DM54LS85 DM74LS85 4-Bit Magnitude Comparators Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS85FMQB or DM54LS85W NS Package Number W16A 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