DataSheet.es    


PDF DM74LS163A Data sheet ( Hoja de datos )

Número de pieza DM74LS163A
Descripción Synchronous 4-Bit Binary Counters
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



Hay una vista previa y un enlace de descarga de DM74LS163A (archivo pdf) en la parte inferior de esta página.


Total 10 Páginas

No Preview Available ! DM74LS163A Hoja de datos, Descripción, Manual

August 1986
Revised April 2000
DM74LS161A • DM74LS163A
Synchronous 4-Bit Binary Counters
General Description
These synchronous, presettable counters feature an inter-
nal carry look-ahead for application in high-speed counting
designs. T he D M74LS161A a nd D M74LS163A ar e 4- bit
binary counters. The carry output is decoded by means of
a N OR ga te, thus pr eventing spi kes d uring th e n ormal
counting mode of operation. Synchronous operation is pro-
vided by having all flip-flops clocked simultaneously so that
the outputs cha nge coincident w ith ea ch oth er when so
instructed by th e co unt-enable i nputs and i nternal gating.
This mod e o f ope ration e liminates the o utput co unting
spikes which ar e no rmally associated w ith asyn chronous
(ripple clock) cou nters. A buffered clock input tr iggers t he
four fl ip-flops o n th e r ising (positive-going) ed ge of t he
clock input waveform.
These counters are fully programmable; that is, the outputs
may be preset to either level. As presetting is synchronous,
setting up a low level at the load input disables the counter
and causes the outputs to a gree with the setup data after
the next clock pulse, regardless of the levels of the enable
input. The clear function for the DM74LS161A is asynchro-
nous; and a low level at the clear input sets all four of t he
flip-flop outputs L OW, regardless o f t he levels o f c lock,
load, o r enable i nputs. T he c lear fu nction for t he
DM74LS163A is synchronous; and a low level at the clear
inputs sets all four of the flip-flop ou tputs LOW af ter the
next cl ock pu lse, regardless of the l evels o f th e e nable
inputs. T his synchronous cl ear allows the co unt l ength to
be mo dified easily, as dec oding the maximum cou nt
desired can be a ccomplished w ith on e e xternal N AND
gate. T he gate ou tput i s con nected to th e cl ear i nput to
synchronously clear the counter to all low outputs.
The carry l ook-ahead ci rcuitry provides fo r cascading
counters fo r n- bit sync hronous ap plications w ithout addi-
tional ga ting. Ins trumental i n a ccomplishing th is fun ction
are two count-enable inputs and a ripple carry output.
Both count-enable inputs (P and T) must be HIGH to count,
and input T is fed forward to enable the ripple carry output.
The r ipple ca rry o utput thus e nabled will produce a high-
level o utput pulse w ith a d uration a pproximately e qual to
the high-level portion of the QA output. This high-level over-
flow ri pple c arry pu lse c an be used to en able suc cessive
cascaded s tages. H IGH-to-LOW l evel t ransitions at the
enable P o r T inputs m ay occur, r egardless of the l ogic
level of the clock.
These c ounters fe ature a fu lly i ndependent cl ock c ircuit.
Changes made to control inputs (enable P or T or load) that
will modify the operating mode have no effect until clocking
occurs. The function of the counter (whether enabled, dis-
abled, loading, or counting) w ill be dictated so lely by the
conditions meeting the stable set-up and hold times.
Features
s Synchronously programmable
s Internal look-ahead for fast counting
s Carry output for n-bit cascading
s Synchronous counting
s Load control line
s Diode-clamped inputs
s Typical propagation time, clock to Q output 14 ns
s Typical clock frequency 32 MHz
s Typical power dissipation 93 mW
Ordering Code:
Order Number Package Number
Package Description
DM74LS161AM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS161AN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74LS163AM
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS163AN
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
© 2000 Fairchild Semiconductor Corporation DS006397
www.fairchildsemi.com
http://www.Datasheet4U.com

1 page




DM74LS163A pdf
Absolute Maximum Ratings(Note 1)
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
65°C to +150°C
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety o f th e d evice ca nnot b e g uaranteed. Th e d evice sh ould n ot b e
operated at these l imits. The p arametric va lues d efined i n t he E lectrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
DM74LS161A Recommended Operating Conditions
Symbol
Parameter
VCC Supply Voltage
VIH HIGH Level Input Voltage
VIL LOW Level Input Voltage
IOH HIGH Level Output Current
IOL LOW Level Output Current
fCLK Clock Frequency (Note 2)
Clock Frequency (Note 3)
tW
Pulse Width
Clock
(Note 2)
Clear
Pulse Width
Clock
(Note 3)
Clear
tSU
Setup Time
Data
(Note 2)
Enable P
Load
Setup Time
Data
(Note 3)
Enable P
Load
tH
Hold Time
Data
(Note 2)
Others
Hold Time
Data
(Note 3)
Others
tREL Clear Release Time (Note 2)
Clear Release Time (Note 3)
TA Free Air Operating Temperature
Note 2: CL = 15 pF, RL = 2 k, TA = 25°C and VCC = 5.5V.
Note 3: CL = 50 pF, RL = 2 k, TA = 25°C and VCC = 5.5V.
Min Nom Max Units
4.75 5 5.25 V
2V
0.8 V
0.4
mA
8 mA
0 25 MHz
0 20 MHz
20 6
20 9
ns
25
ns
25
20 8
25 17
ns
25 15
20
30 ns
30
0 3
0 3
ns
5
ns
5
20 ns
25 ns
0 70 °C
5 www.fairchildsemi.com

5 Page










PáginasTotal 10 Páginas
PDF Descargar[ Datasheet DM74LS163A.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
DM74LS163ASynchronous 4-Bit Binary CountersFairchild Semiconductor
Fairchild Semiconductor
DM74LS163ASynchronous 4-Bit Binary CountersNational Semiconductor
National Semiconductor
DM74LS163ASynchronous 4-Bit Binary Counters (Rev. A)Texas Instruments
Texas Instruments
DM74LS163AESynchronous 4-Bit Binary CountersNational Semiconductor
National Semiconductor

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar