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CD74AC163E-CD74AC163M-CD74AC163M96
Synchronous Presettable Binary Counters with Synchronous Reset
description/ordering information
The ’AC163 devices are 4-bit binary counters.
These synchronous, presettable counters feature
an internal carry look-ahead for application in
high-speed counting designs. Synchronous
operation is provided by having all flip-flops
clocked simultaneously so that the outputs
change, coincident with each other, when instructed by the count-enable (ENP, ENT) inputs and internal gating.
This mode of operation eliminates the output counting spikes normally associated with synchronous
(ripple-clock) counters. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge
of the clock waveform.
The counters are fully programmable; that is, they can be preset to any number between 0 and 9 or 15.
Presetting is synchronous; therefore, setting up a low level at the load input disables the counter and causes
the outputs to agree with the setup data after the next clock pulse, regardless of the levels of the enable inputs.
The clear function is synchronous. A low level at the clear (CLR) input sets all four of the flip-flop outputs low
after the next low-to-high transition of CLK, regardless of the levels of the enable inputs. This synchronous clear
allows the count length to be modified easily by decoding the Q outputs for the maximum count desired. The
active-low output of the gate used for decoding is connected to CLR to synchronously clear the counter to 0000
(LLLL).
The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without
additional gating. ENP, ENT, and a ripple-carry output (RCO) are instrumental in accomplishing this function.
Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. Enabling RCO produces a
high-level pulse while the count is maximum (9 or 15, with QA high). This high-level overflow ripple-carry pulse
can be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed, regardless of the
level of CLK.
These devices feature a fully independent clock circuit. Changes at control inputs (ENP, ENT, or LOAD) that
modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of
the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the
stable setup and hold times.
ORDERING INFORMATION
Package drawings, standard packing quantities, thermal data, symbolization, and PCB
design guidelines are available at www.ti.com/sc/package.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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