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DM74LS461 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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DM74LS461 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
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1 / 4 page  TLL8334 July 1989 DM54LS461DM74LS461 Octal Counter General Description The LS461 is an 8-bit synchronous counter with parallel load clear and hold capability Two function select inputs (I0 I1) provide one of four operations which occur synchro- nously on the rising edge of the clock (CK) The LOAD operation loads the inputs (D7–D0) into the out- put register (Q7–Q0) The CLEAR operation resets the out- put register to all LOWs The HOLD operation holds the previous value regardless of clock transitions The INCRE- MENT operation adds one to the output register when the carry-in input is TRUE (CI e LOW) otherwise the operation is a HOLD The carry-out (CO) is TRUE (CO e LOW) when the output register (Q7–Q0) is all HIGHs otherwise FALSE (CO 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 stand- ards Two or more LS461 octal counters may be cascaded to provide larger counters The operation codes were chosen such that when I1 is HIGH I0 may be used to select be- tween LOAD and INCREMENT as in a program counter (JUMPINCREMENT) FeaturesBenefits Y Octal counter for microprogram-counter DMA controller and general purpose counting applications Y 8 bits match byte boundaries Y Bus-structured pinout Y 24-pin Skinny Dip saves space Y TRI-STATE outputs drive bus lines Y Low current PNP inputs reduce loading Y Expandable in 8-bit increments Connection Diagram Top View TLL8334 – 1 Order Number DM54LS461J DM74LS461J or DM74LS461N See NS Package Number J24F or N24C Standard Test Load TLL8334 – 2 Function Table OE CK I1 I0 CI D7 – D0 Q7 – Q0 Operation H X X X X X Z HI-Z L u L L X X L CLEAR L u L H X X Q HOLD L u H L X D D LOAD L u H H H X Q HOLD L u H H L X Q plus 1 INCREMENT TRI-STATE is a registered trademark of National Semiconductor Corp C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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