Datasheet Texas Instruments SNJ54ALS569AFK — Datenblatt

SN54ALS569A, SN74ALS568A, SN74ALS569A
SYNCHRONOUS 4-BIT UP/DOWN DECADE AND BINARY COUNTERS
WITH 3-STATE OUTPUTS
SDAS229A – APRIL 1982 – REVISED JANUARY 1995 The clear function is initiated by applying a low
level to either asynchronous clear (ACLR) or
synchronous clear (SCLR). Asynchronous (direct)
clearing overrides all other functions of the device,
while synchronous clearing overrides only the
other synchronous functions. Data is loaded from
the A, B, C, and D inputs by holding load (LOAD)
low during a positive-going clock transition. The
counting function is enabled only when enable P
(ENP) and enable T (ENT) are low and ACLR,
SCLR, and LOAD are high. The up/down (U/D)
input controls the direction of the count. These
counters count up when U/D is high and count
down when U/D is low. 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 VCC
RCO
CCO
OE
QA
QB
QC …