datasheets 74ls190 free download

File name 74ls190.pdf

SN54/74LS190 PRESETTABLE BCD/DECADE SN54/74LS191 UP/DOWN COUNTERS PRESETTABLE 4-BIT BINARY PRESETTABLE BCD / DECADE UP/DOWN COUNTERS UP/ DOWN COUNTERS PRESETTABLE 4-BIT BINARY The SN54 / 74LS190 is a synchronous UP/ DOWN BCD Decade (8421) UP/ DOWN COUNTERS Counter and the SN54/ 74LS191 is a synchronous UP / DOWN Modulo-16 Binary Counter. State changes of the counters are synchronous with the LOW POWER SCHOTTKY LOW-to-HIGH transition of the Clock Pulse input. An asynchronous Parallel Load (PL) input overrides counting and loads the data present on the Pn inputs into the flip-flops, which makes it possible to use the circuits as programmable counters. A Count Enable (CE) input serves as J SUFFIX the carry / borrow input in multi-stage counters. An Up / Down Count Control CERAMIC (U/D) input determines whether a circuit counts up or down. A Terminal Count CASE 620-09 (TC) output and a Ripple Clock (RC) output provide overflow/underflow 16 indication and make possible a variety of methods for generating 1 carry / borrow signals in multistage counter applications.