74LS ON Semiconductor, 74LS Datasheet

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... SYNCHRONOUS 4-BIT UP/DOWN COUNTER The SN54 / 74LS669 is a synchronous 4-bit up/down counter. The LS669 is a 4-bit binary counter. For high speed counting applications, this presettable counter features an internal carry lookahead for cascading purposes. By clocking all flip-flops simultaneously so the outputs change coincident with each other (when instructed the count enable inputs and internal gating) synchronous operation is provided ...

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... (14) (13) GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH Output Current — High I OL Output Current — Low SN54/74LS669 LOGIC DIAGRAM (5) DATA DATA (12) Min 54 4.5 74 4.75 54 – ...

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... S Symbol b l Parameter Clock Pulse Width t s Data Setup Time t s Enable Setup Time t s Load Setup Time t s U/D Setup Time t h Hold Time, Any Input SN54/74LS669 (unless otherwise specified) Limits Min Typ Max U i Unit 2 0 0.8 – 0.65 – 1.5 ...

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... SN54/74LS669 PARAMETER MEASUREMENT INFORMATION t w(clock) t w(clock) CLOCK 1.3 V 1.3 V INPUT LOAD 1.3 V INPUT DATA INPUTS 1.3 V A,B,C, and D ENABLE P or ENABLE T UP/DOWN INPUT VOLTAGE WAVEFORMS ENABLE T 1.3 V INPUT t PHL RIPPLE 1.3 V CARRY OUTPUT FAST AND LS TTL DATA 1 1 1.3 V ...