5485/DM5485/DM7485 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 paths are implemented with only a two-gate-level delay to reduce overall comparison times for long words. Features Y Y Y Typical power dissipation 275 mW Typical delay (4-bit words) 23 ns Alternate Military/Aerospace device (5485) is available. Contact a National Semiconductor Sales Office/Distributor for specifications. Connection Diagram Dual-In-Line Package TL/F/6530 – 1 Order Number 5485DMQB, 5485FMQB, DM5485J, DM5485W or DM7485N See NS Package Number J16A, N16E or W16A C1995 National Semiconductor Corporation TL/F/6530 RRD-B30M105/Printed in U. S. A. 5485/DM5485/DM7485 4-Bit Magnitude Comparators June 1989 Absolute Maximum Ratings (Note) 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. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage 7V Input Voltage 5.5V Operating Free Air Temperature Range b 55§ C to a 125§ C DM54 and 54 DM74 0§ C to a 70§ C Storage Temperature Range b 65§ C to a 150§ C Recommended Operating Conditions Symbol DM5485 Parameter VCC Supply Voltage VIH High Level Input Voltage VIL Low Level Input Voltage IOH High Level Output Current IOL Low Level Output Current TA Free Air Operating Temperature DM7485 Units Min Nom Max Min Nom Max 4.5 5 5.5 4.75 5 5.25 2 2 V 0.8 0.8 V b 0.8 b 0.8 mA 16 mA 70 §C 16 b 55 V 125 0 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC e Min, II e b12 mA VOH High Level Output Voltage VCC e Min, IOH e Max VIL e Max, VIH e Min VOL Low Level Output Voltage VCC e Min, IOL e Max VIH e Min, VIL e Max II Input Current @ Max Input Voltage VCC e Max, VI e 5.5V IIH High Level Input Current VCC e Max VI e 2.4V Low Level Input Current VCC e Max VI e 0.4V IIL IOS ICC Short Circuit Output Current VCC e Max (Note 2) Supply Current VCC e Max (Note 3) Min Typ (Note 1) Units b 1.5 V 2.4 V 0.4 V 1 mA AkB 40 AlB 40 Others 120 AkB b 1.6 AlB b 1.6 Others b 4.8 DM54 b 20 b 55 DM74 b 18 b 55 55 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. Note 3: ICC is measured with all outputs open, A e B input grounded and all other inputs at 4.5V. 2 Max 88 mA mA mA mA Switching Characteristics at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load) Symbol From Input Parameter To Output Number of Gate Levels RL e 400X CL e 15 pF Min tPLH tPHL Propagation Delay Time Low-to-High Level Output Propagation Delay Time High-to-Low Level Output Any A or B Data Input Any A or B Data Input Units Max AkB AlB 3 26 AeB 4 35 AkB AlB 3 30 AeB 4 30 ns ns tPLH Propagation Delay Time Low-to-High Level Output AkB or A e B AlB 1 11 ns tPHL Propagation Delay Time High-to-Low Level Output AkB or A e B AlB 1 17 ns tPLH Propagation Delay Time Low-to-High Level Output A eB AeB 2 20 ns tPHL Propagation Delay Time High-to-Low Level Output AeB AeB 2 17 ns tPLH Propagation Delay Time Low-to-High Level Output AlB or A e B AkB 1 11 ns tPHL Propagation Delay Time High-to-Low Level Output AlB or A e B AkB 1 17 ns Function Table Comparing Inputs Cascading Inputs Outputs A3, B3 A2, B2 A1, B1 A0, B0 AlB AkB AeB AlB AkB AeB 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 A3 e B3 X X X X X X X X X X X X X X X X X X X X H L L X H L X X X X X X X X L H L X H L X X X X X X X X L L H H L L H L H L H L H L H L L L L H L H L H L H L H L H L L L H L L L L L L L L L L H H L L 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 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 A0 l B0 A0 k B0 A0 e B0 A0 e B0 A0 e B0 A0 e B0 A0 e B0 A0 e B0 H e High Level, L e Low Level, X e Don’t Care 3 Logic Diagram TL/F/6530 – 2 4 Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number 5485DMQB or DM5485J NS Package Number J16A 16-Lead Molded Dual-In-Line Package (N) Order Number DM7485N NS Package Number N16E 5 5485/DM5485/DM7485 4-Bit Magnitude Comparators Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Packge (W) Order Number 5485FMQB or DM5485W 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. 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