DS3687 ,Negative Voltage Relay DriverapplicationsConnectionDiagramsMetalCanPackage Dual-In-LinePackageTL/F/5823–1TopViewPin4isinelectric ..
DS3691M ,RS-422/RS-423 Line Drivers With TRI-STATE Outputsfeatures 4 buffered outputs• TRI-STATE Outputs in RS-422 Modewith high source and sink current capa ..
DS3691MX ,RS-422/RS-423 Line Drivers With TRI-STATE OutputsElectrical Characteristics” provide conditions for actual device operation.Note3: Unless otherwise ..
DS3691N ,RS-422/RS-423 Line Drivers With TRI-STATE OutputsFeaturesn Dual RS-422 line driver with mode pin low, or quadThe DS1691A/DS3691 are low power Schott ..
DS3691V ,RS-422/RS-423 Line Drivers With TRI-STATE OutputsElectrical Characteristics (Notes 3, 4, 5, 6)Symbol Parameter Conditions Min Typ Max UnitsRS-423 CO ..
DS3691VX ,RS-422/RS-423 Line Drivers With TRI-STATE OutputsElectrical Characteristics (Notes 3, 4, 5, 6)Symbol Parameter Conditions Min Typ Max UnitsRS-422 CO ..
EC103D1 ,SCR
EC103D1 ,SCR
EC103D1 ,SCR
EC2-12NU ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
EC2-24 ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
EC2-24NU ,COMPACT AND LIGHTWEIGHT, SMALL MOUNTING SIZE, HIGH BREAKDOWN VOLTAGE
DS3687
Real Time Clock
TL/F/5823
DS1687/DS3687
Negative
Voltage
Relay
Driver
March 1988
DS1687/DS3687 Negative Voltage Relay Driver
General Description
The DS1687/DS3687isa high voltage/current negative
voltage relay driver having many featuresnot availablein
present relay drivers.
PNP inputs provide both TTL/LS compatibility and highin-
put impedanceforlow input loading.
Output leakageis specified over temperatureatan output
voltageof b54V. Minimum output breakdown (ac/latch
breakdown)is specified over temperatureatb5 mA. This
clearly definesthe actual breakdownofthe device sincethe
circuit has incorporatedinitan internal reference which
doesnot allow output breakdown latching foundin existing
relay drivers. Additionally,this internal reference circuitfea-
turewill eliminatethe needin most casesofan external
clamping (inductive transient voltage protection) diode.
Whenthe outputis turned ‘‘OFF’’by input logic conditions
the resulting inductivevoltage transient seen atthe outputis
detectedbyan internal zener reference.The reference then
momentarily activatesthe output transistor long enoughso
thatthe relay energyis discharged. This feature eliminates
the needof external circuit protection componentsandin-
sures output transistor protection.
The outputsare Darlington connected transistors, whichal-
low high current operationatlow internal VCC currentlev-
elsÐbasedrive forthe output transistoris obtained fromthe
loadin proportiontothe required loading conditions. Typical
VCC powerwith both outputs ‘‘ON’’is90 mW.
The circuit also features output transistor protectionifthe
VCC supplyislostby forcingthe outputintothe high imped-
ance ‘‘OFF’’ state withthe same breakdown levelsas when
VCC was applied.
Features TTL/LS/CMOS compatible inputs High impedance inputs (PNP’s) High output voltage breakdown (b65Vtyp) High output current capability (300mA max) Internal protection circuit eliminates needfor output
protection diode Output breakdown protectionif VCC supplyislost Low VCC power dissipation(90 mW (typ) both outputs
‘‘ON’’) Voltage and current levels compatiblefor usein tele-
phone relay applications
Connection Diagrams
Metal Can Package
TL/F/5823–1
Top View
Pin4 isinelectrical contactwiththecase
Order Number DS1687Hor DS3687H
SeeNS Package Number H08C
Truth Table
Positivelogic:ABeX B OutputX 1 1 1 0
Logic‘‘0’’ output ‘‘ON’’
Logic‘‘1’’ output ‘‘OFF’’
Dual-In-Line Package
TL/F/5823–2
TopView
Order Number DS1687J-8,
DS3687J-8or DS3687N
See NSPackageNumber J08Aor N08E
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
