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OE
CK
I1
I0
CI
D7–D0
Q7–Q0
Operation
HLLLLL
X
uuuu
u
XLLHHH
XLHLHH
XXXXHL
XXXDXX
ZLQDQ
Qplus1
HI-ZCLEARHOLDLOADHOLD
INCREMENT
July1989
DM54LS461/DM74LS461OctalCounter
GeneralDescription
TheLS461isan8-bitsynchronouscounterwithparallelload,clear,andholdcapability.Twofunctionselectinputs(I0,I1)proneoffouroperationswhichoccursynchro-
nouslyontherisingedgeoftheclock(CK).
TheLOADoperationloadstheinputs(D7–D0)intotheout-putregister(Q7–Q0).TheCLEARoperationresetstheout-putregistertoallLOWs.TheHOLDoperationholdsthepreviousvalueregardlessofclocktransitions.TheINCRE-MENToperationaddsonetotheoutputregisterwhenthecarry-ininputisTRUE(CILOW),otherwisetheoperationisaHOLD.Thecarry-out(CO)isTRUE(COLOW)whentheoutputregister(Q7–Q0)isallHIGHs,otherwiseFALSE(COHIGH).
Theoutputregister(Q7–Q0)isenabledwhenOEisLOW,anddisabled(HI-Z)whenOEisHIGH.Theoutputdriverswillsinkthe24mArequiredformanybusinterfacestand-ards.
TwoormoreLS461octalcountersmaybecascadedto
providelargercounters.TheoperationcodeswerechosensuchthatwhenI1isHIGH,I0maybeusedtoselectbe-tweenLOADandINCREMENTasinaprogramcounter(JUMP/INCREMENT).
Features/Benefits
YOctalcounterformicroprogram-counter,DMAcontrollerandgeneralpurposecountingapplications
Y8bitsmatchbyteboundaries
YBus-structuredpinout
Y24-pinSkinnyDipsavesspace
YTRI-STATEéoutputsdrivebuslines
YLowcurrentPNPinputsreduceloading
YExpandablein8-bitincrements
ConnectionDiagram
StandardTestLoad
TopView
TL/L/83342
TL/L/83341
OrderNumberDM54LS461J,DM74LS461JorDM74LS461N
SeeNSPackageNumberJ24ForN24C
FunctionTable
TRISTATEéisa
ofNationalSemiconductorCorp
DM54LS461/DM74LS461OctalCounter
C1995NationalSemiconductorCorporation
TL/L/8334
RRDB30M115/PrintedinUSA
Absolute umRatings
IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.
SupplyVoltageVCC 7V
InputVoltage 5.5V
OperatingConditions
Off-StateOutputVoltage 5.5V
StorageTemperature b65§Ctoa150§C
Symbol
Parameter
Military
Commercial
Units
Min
Typ
Max
Min
Typ
Max
VCC
SupplyVoltage
4.5
5
5.5
4.75
5
5.25
V
TA
Operating-AirTemperature
b55
125*
0
75
§C
tW
WidthofClock
Low
40
35
ns
High
30
25
tSU
SetUpTime
60
50
ns
th
HoldTime
0
b15
0
b15
*CaseTemperature
ElectricalCharacteristicsOverOperatingConditions
Symbol
Parameter
TestConditions
Min
Typ2
Max
Units
VIL
Low-LevelInputVoltage
0.8
V
VIH
High-LevelInputVoltage
2
V
VIC
InputClampVoltage
VCC
MIN
II
b18mA
b1.5
V
IIL
Low-LevelInputCurrent
VCC
MAX
VI0.4V
b0.25
mA
IIH
High-LevelInputCurrent
VCC
MAX
VI2.4V
25
mA
II
umInputCurrent
VCC
MAX
VI5.5V
1
mA
VOL
Low-LevelOutputVoltage
VCCMIN
VIL0.8V
MIL IOL12mA
0.5
V
VIH2V
COM IOL24mA
VOH
High-LevelOutputVoltage
VCCMIN
VIL0.8V
MIL IOHb2mA
2.4
V
VIH2V
COM IOHb3.2mA
IOZL
Off-StateOutputCurrent
VCCMAX
VIL0.8V
VIH2V
VO0.4V
b100
mA
IOZH
VO2.4V
100
mA
IOS
OutputShort-CircuitCurrent*
VCC
5.0V
VCC0V
b30
b130
mA
ICC
SupplyCurrent
VCC
MAX
120
180
mA
*Nomorethanoneoutputshouldbeshortedatatimeanddurationoftheshort-circuitshouldnotexceedonesecond
2AlltypicalvaluesareatVCC5V,TA25§C.
SwitchingCharacteristicsOverOperatingConditions
Symbol
Parameter
TestConditions(SeeTestLoad)
Military
Commercial
Units
Min
Typ
Max
Min
Typ
Max
fMAX
umClockFrequency
CL50pF
R1200X
R2390X
10.5
12.5
MHz
tPD
CBItoCBODelay
35
60
35
50
ns
tPD
ClocktoQ
20
35
20
30
ns
tPD
ClocktoCO
55
95
55
80
ns
tPZX
OutputEnableDelay
35
55
35
45
ns
tPXZ
OutputDisableDelay
35
55
35
45
ns
2
LogicDiagram
LS461
TL/L/83343
3
DM54LS461/DM74LS461OctalCounter
PhysicalDimensionsinches(millimeters)
24-PinNarrowCeramicDual-In-LinePackage(J)
OrderNumberDM54LS461JorDM74LS461JNSPackageJ24F
LIFESUPPORT
24-PinNarrow sticDual-In-LinePackage(N)
OrderNumberDM74LS461NNSPackageN24C
NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORT
DEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHE OFNATIONALSEMICONDUCTORCORPORATION.Asusedherein:
1.Lifesupportdevicesorsystemsaredevicesor2.Acriticalcomponentisanycomponentofalifesystemswhich,(a)areintendedforsurgicalimntsupportdeviceorsystemwhosefailuretoperformcanintothebody,or(b)supportorsustainlife,andwhosebereasonablyexpectedtocausethefailureofthelifefailuretoperform,whenproperlyusedinaccordancesupportdeviceorsystem,ortoaffectitssafetyorwithinstructionsforuseprovidedinthelabeling,caneffectiveness.
bereasonablyexpectedtoresultinasignificantinjurytotheuser.
NationalSemiconductor
Corporation
1111WestBardinRoadArlington,TX76017
:1(800)272-9959
Fax:1(800)737-7018
NationalSemiconductor
Europe
Fax:(a49)0-180-5308586
:cn
Deutsch :(a49)0-180-5308585
English :(a49)0-180-5327832
Fran3ais:(a49)0-180-5329358
NationalSemiconductor
13thFloor,StraightBlock,OceanCentre,5CantonRd.Tsimshatsui,
NationalSemiconductor
Japan.
:81-
Fax:81-
I
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