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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.