Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

DM74LS161A Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part # DM74LS161A
Description  Synchronous 4-Bit Binary Counters
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

DM74LS161A Datasheet(HTML) 1 Page - Fairchild Semiconductor

  DM74LS161A Datasheet HTML 1Page - Fairchild Semiconductor DM74LS161A Datasheet HTML 2Page - Fairchild Semiconductor DM74LS161A Datasheet HTML 3Page - Fairchild Semiconductor DM74LS161A Datasheet HTML 4Page - Fairchild Semiconductor DM74LS161A Datasheet HTML 5Page - Fairchild Semiconductor DM74LS161A Datasheet HTML 6Page - Fairchild Semiconductor DM74LS161A Datasheet HTML 7Page - Fairchild Semiconductor DM74LS161A Datasheet HTML 8Page - Fairchild Semiconductor DM74LS161A Datasheet HTML 9Page - Fairchild Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 1 / 10 page
background image
© 2000 Fairchild Semiconductor Corporation
DS006397
www.fairchildsemi.com
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. The DM74LS161A and DM74LS163A are 4-bit
binary counters. The carry output is decoded by means of
a NOR gate, thus preventing spikes during the normal
counting mode of operation. Synchronous operation is pro-
vided by having all flip-flops clocked simultaneously so that
the outputs change coincident with each other when so
instructed by the count-enable inputs and internal gating.
This mode of operation eliminates the output counting
spikes which are normally associated with asynchronous
(ripple clock) counters. A buffered clock input triggers the
four flip-flops on the rising (positive-going) edge of the
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 agree 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 the
flip-flop outputs LOW, regardless of the levels of clock,
load, or enable inputs. The clear function for the
DM74LS163A is synchronous; and a low level at the clear
inputs 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, as decoding the maximum count
desired can be accomplished with one external NAND
gate. The gate output is connected to the clear input to
synchronously clear the counter to all low outputs.
The carry look-ahead circuitry provides for cascading
counters for n-bit synchronous applications without addi-
tional gating. Instrumental in accomplishing this function
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 ripple carry output thus enabled will produce a high-
level output pulse with a duration approximately equal to
the high-level portion of the QA output. This high-level over-
flow ripple carry pulse can be used to enable successive
cascaded stages. HIGH-to-LOW level transitions at the
enable P or T inputs may occur, regardless of the logic
level of the clock.
These counters feature a fully independent clock circuit.
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) will be dictated solely 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:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the 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


Similar Part No. - DM74LS161A

ManufacturerPart #DatasheetDescription
logo
National Semiconductor ...
DM74LS161A NSC-DM74LS161A Datasheet
210Kb / 12P
   Synchronous 4-Bit Binary Counters
logo
Fairchild Semiconductor
DM74LS161A FAIRCHILD-DM74LS161A Datasheet
256Kb / 12P
   Synchronous 4-Bit Binary Counters
logo
National Semiconductor ...
DM74LS161AE NSC-DM74LS161AE Datasheet
210Kb / 12P
   Synchronous 4-Bit Binary Counters
DM74LS161AJ NSC-DM74LS161AJ Datasheet
210Kb / 12P
   Synchronous 4-Bit Binary Counters
DM74LS161AM NSC-DM74LS161AM Datasheet
210Kb / 12P
   Synchronous 4-Bit Binary Counters
More results

Similar Description - DM74LS161A

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
SN54HC163 TI-SN54HC163 Datasheet
640Kb / 24P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
SN54LV163A TI1-SN54LV163A_15 Datasheet
947Kb / 26P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
SN54LV161A TI-SN54LV161A_08 Datasheet
610Kb / 22P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
logo
National Semiconductor ...
54LS161A NSC-54LS161A Datasheet
210Kb / 12P
   Synchronous 4-Bit Binary Counters
logo
Texas Instruments
CD54AC161 TI-CD54AC161 Datasheet
383Kb / 15P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
CD54AC163 TI-CD54AC163 Datasheet
154Kb / 11P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
SN54HC161 TI-SN54HC161 Datasheet
642Kb / 24P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
CD74AC161ME4 TI-CD74AC161ME4 Datasheet
553Kb / 18P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
SN54LV161A TI-SN54LV161A Datasheet
440Kb / 20P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
CD54ACT163 TI-CD54ACT163_08 Datasheet
677Kb / 18P
[Old version datasheet]   4-BIT SYNCHRONOUS BINARY COUNTERS
More results


Html Pages

1 2 3 4 5 6 7 8 9 10


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com