DM74LS461N ,Octal CounterFeatures/BenefitsYprevious value regardless of clock transitions. The INCRE- Octal counter for micr ..
DM74LS461N ,Octal CounterDM54LS461/DM74LS461OctalCounterJuly1989DM54LS461/DM74LS461OctalCounterGeneralDescriptionThe LS461 i ..
DM74LS471J ,60 ns, (256 x 8) 2048-bit TTL PROMBlock Diagram
A7
M
"
M
Al
DECOIJEII
Pln
20488" ARMY
32 x M
MEMORY MATRIX
TL/D/ ..
DM74LS471N ,60 ns, (256 x 8) 2048-bit TTL PROMFeatures
I Advanced titanium-tungsten (T i-W) fuses
I Schottky-clamped for high speed
Addres ..
DM74LS47N ,BCD TO 7-SEGMENT DECODER/DRIVERFeatures
The 'LS47 accepts four lines of BCD (B421) input data, gen- l Open-collector outputs
..
DM74LS47N ,BCD TO 7-SEGMENT DECODER/DRIVER
DS2408S+ ,1-Wire 8-Channel Addressable SwitchFEATURES PIN CONFIGURATION Control Eight Independent I/O Port Pins from a Single Micro Port Pin o ..
DS2409P+ ,MicroLAN CouplerPIN DESCRIPTIONcontrol outputPin 1 GND Communicates at 16.3kbits per secondPin 2 1-Wire in Unique ..
DS2411 ,Silicon Serial Number with VFEATURES PIN CONFIGURATION Unique, Factory-Lasered and Tested 64-Bit 3 Registration Number (8-B ..
DS2411 ,Silicon Serial Number with VPIN DESCRIPTION *The DS2411X is RoHS qualified and comes in tape and reel. PIN NAME FLIP SOT23 ..
DS2411P ,Silicon Serial Number with VCC InputPIN DESCRIPTIONPART TEMP RANGE PACKAGEPINDS2411R/ SOT23-3,NAME FLIP-40C to +85CSOT23 TSOCT&R Tape ..
DS2411P+ ,Silicon Serial Number with VCC InputFEATURES PIN CONFIGURATION Unique, Factory-Lasered and Tested 64-Bit 3 Registration Number (8-B ..
DM74LS461N
Octal Counter
TL/L/8334
DM54LS461/DM74LS461
Octal
Counter
July 1989
DM54LS461/DM74LS461 Octal Counter
General Description
The LS461isan 8-bit synchronous counter with parallel
load, clear,and hold capability. Two function select inputs
(I0,I1) provide oneoffour operations which occur synchro-
nouslyonthe rising edgeofthe clock (CK).
The LOAD operation loadsthe inputs (D7–D0)intotheout-
put register (Q7–Q0). The CLEAR operation resetstheout-
put registertoall LOWs. The HOLD operation holdsthe
previous value regardlessof clock transitions.The INCRE-
MENT operation addsonetothe output register whenthe
carry-in inputis TRUE(CIe LOW), otherwisethe operationa HOLD.The carry-out (CO)is TRUE(COe LOW) when
the output register (Q7–Q0)isall HIGHs, otherwise FALSE
(COe HIGH).
The output register (Q7–Q0)is enabled whenOEis LOW,
and disabled (HI-Z) whenOEis HIGH. The output drivers
will sinkthe24mA requiredfor manybus interface stand-
ards.
Twoor more LS461 octal counters maybe cascadedto
provide larger counters. The operation codes were chosen
such that whenI1is HIGH,I0 maybe usedto selectbe-
tween LOAD and INCREMENTasina program counter
(JUMP/INCREMENT).
Features/Benefits Octal counterfor microprogram-counter, DMA controller
and general purpose counting applications8bits match byte boundaries Bus-structured pinout 24-pin SkinnyDip saves space TRI-STATEÉ outputs drivebus lines Low current PNP inputs reduce loading Expandablein 8-bit increments
Connection Diagram
Top View
TL/L/8334–1
Order Number DM54LS461J,
DM74LS461Jor DM74LS461N
See NSPackageNumber J24For N24C
Standard Test Load
TL/L/8334–2
Function Table CKI1I0CI D7–D0 Q7–Q0 Operation X XXX X Z HI-Z uLLX X L CLEAR uLHX X Q HOLD uHLX D D LOAD uHHH X Q HOLD uHHL X Qplus1 INCREMENT
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorp.
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
