SN74ALS163BNSR ,Synchronous 4-Bit Binary Counterslogic diagram (positive logic)SN54ALS162B9LOAD1015ENTRCO7ENP1CLR2CLK14C1 QA1D3A13C1 QB1D4B12C1 QC1D ..
SN74ALS1640AN ,Octal Bus Transceivers With 3-State Outputs
SN74ALS1645ADW , OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
SN74ALS1645AN ,Octal Bus Transceivers With 3-State Outputsfeatures noninverting logic.The SN74ALS1640A and SN74ALS1645A are characterized for operation from ..
SN74ALS164A ,8-Bit Parallel-Out Serial Shift RegistersfeaturesAND-gated serial (A and B) inputs and anasynchronous clear (CLR) input. The gated serialinp ..
SN74ALS164AD ,8-Bit Parallel-Out Serial Shift Registersmaximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
SN74LV4053APWRG4 ,Triple 2-Channel Analog Multiplexer/Demultiplexer 16-TSSOP -40 to 85maximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
SN74LV4053APWTG4 , TRIPLE 2-CHANNEL ANALOG MULTIPLEXERS/DEMULTIPLEXERS
SN74LV4053ARGYR ,Triple 2-Channel Analog Multiplexer/Demultiplexerlogic diagram (positive logic)152-COM141-COM11A121Y0131Y110B22Y012Y19C53Y033Y164INH3-COM2POST OFFIC ..
SN74LV4066A ,Quadruple Bilateral Analog Switchmaximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
SN74LV4066AD ,Quadruple Bilateral Analog SwitchSN54LV4066A, SN74LV4066AQUADRUPLE BILATERAL ANALOG SWITCHESSCLS427I − APRIL 1999 − REVISED APRIL 20 ..
SN74LV4066ADBR ,Quadruple Bilateral Analog Switchmaximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
SN74ALS163B-SN74ALS163BD-SN74ALS163BN-SN74ALS163BNSR
Synchronous 4-Bit Binary Counters
Synchronously Programmable Package Options Include PlasticSmall-Outline (D) and Shrink Small-Outline
(DB) Packages, Ceramic Chip Carriers (FK),
Standard Plastic (N) and Ceramic (J) DIPs
descriptionThese synchronous, presettable, 4-bit decade
and binary counters feature an internal carry
look-ahead circuitry for application in high-speed
counting designs. The SN54ALS162B is a 4-bit
decade counter. The ’ALS161B, ’ALS163B,
’AS161, and ’AS163 devices are 4-bit binary
counters. Synchronous operation is provided by
having all flip-flops clocked simultaneously so that
the outputs change coincidentally 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 asynchronous (ripple-clock)
counters. A buffered clock (CLK) input triggers the
four flip-flops on the rising (positive-going) edge of
the clock input waveform.
These counters are fully programmable; they can
be preset to any number between 0 and 9 or 15.
Because presetting is synchronous, setting up a
low level at the load (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 for the ’ALS161B and ’AS161 devices is asynchronous. A low level at the clear (CLR) input
sets all four of the flip-flop outputs low, regardless of the levels of the CLK, LOAD, or enable inputs. The clear
function for the SN54ALS162B, ’ALS163B, and ’AS163 devices is synchronous, and a low level at CLR sets
all four of the flip-flop outputs low after the next clock pulse, 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 and ENT inputs and a ripple-carry (RCO) output are instrumental in accomplishing this
function. Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. RCO, thus enabled,
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.B
SN54ALS161B, SN54ALS162B, SN54ALS163B,
SN54AS161, SN54AS163... FK PACKAGE
(TOP VIEW)CLKCLRNC
LOAD
ENT
RCO
ENP
GND
NC – No internal connection
CLR
CLK
ENP
GNDCC
RCOB
ENT
LOAD
