Text preview for : 74ls90.pdf part of datasheets 74ls90 . Electronic Components Datasheets Various datasheets 74ls90.pdf



Back to : 74ls90.pdf | Home

SN54/74LS90
SN54/74LS92
DECADE COUNTER; SN54/74LS93
DIVIDE-BY-TWELVE COUNTER;
4-BIT BINARY COUNTER
DECADE COUNTER;
The SN54 / 74LS90, SN54 / 74LS92 and SN54 / 74LS93 are high-speed
4-bit ripple type counters partitioned into two sections. Each counter has a di-
DIVIDE-BY-TWELVE COUNTER;
vide-by-two section and either a divide-by-five (LS90), divide-by-six (LS92) or 4-BIT BINARY COUNTER
divide-by-eight (LS93) section which are triggered by a HIGH-to-LOW transi- LOW POWER SCHOTTKY
tion on the clock inputs. Each section can be used separately or tied together
(Q to CP) to form BCD, bi-quinary, modulo-12, or modulo-16 counters. All of
the counters have a 2-input gated Master Reset (Clear), and the LS90 also
has a 2-input gated Master Set (Preset 9).