DM54LS469/DM74LS469 8-Bit Up/Down Counter General Description The ‘LS469 is an 8-bit synchronous up/down counter with parallel load and hold capability. Three function-select inputs (LD, UD, CBI) provide one of four operations which occur synchronously on the rising edge of the clock (CK). The LOAD operation loads the inputs (D7 – D0) into the output register (Q7 – Q0). The HOLD operation holds the previous value regardless of clock transitions. The INCREMENT operation adds one to the output register when the carry-in input is TRUE (CBI e LOW), otherwise the operation is a HOLD. The carry-out (CBO) is TRUE (CBO e LOW) when the output register (Q7 – Q0) is all HIGHs, otherwise FALSE (CBO e HIGH). The DECREMENT operation subtracts one from the output register when the borrow-in input is TRUE (CBI e LOW), otherwise the operation is a HOLD. The borrow-out (CBO) is TRUE (CBO e LOW) when the output register (Q7 – Q0) is all LOWs, otherwise FALSE (CBO e HIGH). The output register (Q7 –Q0) is enabled when OE is LOW, and disabled (HI-Z) when OE is HIGH. The output drivers will sink the 24 mA required for many bus-interface standards. Two or more ‘LS469 octal up/down counters may be cascaded to provide larger counters. Connection Diagram Standard Test Load Features/Benefits Y Y Y Y Y Y Y 8-bit up/down counter for microprogram-counter, DMA controller and general-purpose counting applications 8 bits matches byte boundaries Bus-structured pinout 24-pin SKINNYDIP saves space TRI-STATEÉ outputs drive bus lines Low current PNP inputs reduce loading Expandable in 8-bit increments Top View TL/L/8333 – 3 TL/L/8333 – 1 Order Number DM54LS469J, DM74LS469J or DM74LS469N See NS Package Number J24F or N24C Function Table OE CK LD UD CBI D7 – D0 H L L L L L X u u u u u X L H H H H X X L L H H X X H L H L X D X X X X Q7 – Q0 Operation Z HI-Z D LOAD Q HOLD Q plus 1 INCREMENT Q HOLD Q minus 1 DECREMENT TRI-STATEÉ is a registered trademark of National Semiconductor Corp. C1995 National Semiconductor Corporation TL/L/8333 RRD-B30M115/Printed in U. S. A. DM54LS469/DM74LS469 8-Bit Up/Down Counter July 1989 Absolute Maximum Ratings Off-State Output Voltage If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Supply Voltage VCC 5.5V Storage Temperature b 65§ C to a 150§ C 7V Input Voltage 5.5V Operating Conditions Symbol Military Parameter VCC Supply Voltage TA Operating Free-Air Temperature tW Width of Clock Min Typ 4.5 5 b 55 Commercial Min Typ Max 5.5 4.75 5 5.25 V 125* 0 75 §C Low 40 35 High 30 25 tSU Set Up Time 60 th Hold Time 0 Units Max 10 ns 50 b 15 ns 0 b 15 *Case Temperature Electrical Characteristics Over Operating Conditions Symbol Parameter Test Conditions Min Typ ² Max Low-Level Input Voltage VIH High-Level Input Voltage VIC Input Clamp Voltage VCC e MIN II eb18 mA b 1.5 V IIL Low-Level Input Current VCC e MAX VI e 0.4V b 0.25 mA IIH High-Level Input Current VCC e MAX VI e 2.4V 25 mA II Maximum Input Current VCC e MAX VI e 5.5V 1 mA VOL Low-Level Output Voltage VCC e MIN VIL e 0.8V VIH e 2V 0.5 V VOH High-Level Output Voltage 0.8 Units VIL 2 VCC e MIN VIL e 0.8V VIH e 2V Off-State Output Current VCC e MAX VIL e 0.8V VIH e 2V IOS Output Short-Circuit Current* VCC e 5.0V ICC Supply Current VCC e MAX IOZL IOZH MIL IOL e 12 mA COM IOL e 24 mA MIL IOH eb2 mA COM IOH eb3.2 mA 2.4 V VO e 0.4V b 100 VO e 2.4V VO e 0V V V b 30 120 mA 100 mA b 130 mA 180 mA *No more than one output should be shorted at a time and duration of the short-circuit should not exceed one second ² All typical values are VCC e 5V, TA e 25§ C. Switching Characteristics Over Operating Conditions Symbol Parameter Test Conditions (See Test Load/Waveforms) Military Min Commercial Typ Max 35 Units Typ Max 60 35 50 ns 20 35 20 30 ns 10.5 Min fMAX Maximum Clock Frequency tPD CBI to CBO Delay tPD Clock to Q tPD Clock to CBO 55 95 55 80 ns tPZX Output Enable Delay 20 45 20 35 ns tPXZ Output Disable Delay 20 45 20 35 ns CL e 50 pF R1 e 200X R2 e 390X 2 12.5 MHz Logic Diagram LS469 TL/L/8333 – 2 3 DM54LS469/DM74LS469 8-Bit Up/Down Counter Physical Dimensions inches (millimeters) 24-Pin Narrow Ceramic Dual-In-Line Package (J) Order Number DM54LS469J or DM74LS469J NS Package Number J24F 24-Pin Narrow Plastic Dual-In-Line Package (N) Order Number DM74LS469N NS Package Number N24C 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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