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SP1481EEN-L/TR

P1-P3P4-P6P7-P8
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP1481E-1485E_103_052413
4
PIN FUNCTION
Pin1–RO–ReceiverOutput.
Pin2–RE–ReceiverOutputEnableActiveLOW.
Pin3–DE–DriverOutputEnableActiveHIGH.
Pin4–DI–DriverInput.
Pin5–GND–GroundConnection.
Pin6–A–DriverOutput/ReceiverInputNon-inverting.
Pin7–B–DriverOutput/ReceiverInputInverting.
Pin8–Vcc–PositiveSupply4.75V<Vcc<5.25V.
SP1481E and SP1485E
Pinout(TopView)
Figure5.DriverPropagationDelays
+3V
0V
DI
A
B
DRIVER
OUTPUT
V
O
+
DIFFERENTIAL
OUTPUT
V
A
– V
B
0V
V
O
–
1.5V 1.5V
t
PLH
t
F
t
R
f ≥ 1MHz; t
R
≤ 1ns; t
F
≤ 1ns
V
O
1/2V
O
1/2V
O
t
PHL
Figure1.RS-485DriverDCTestLoadCircuit
Figure3.RS-485Driver/ReceiverTimingTestCircuit
C
L1
15pF
RO
A
B
A
B
DI
C
L2
R
DIFF
500
C
L
Output
Under
Test
S
1
S
2
V
CC
1kΩ
1kΩC
RL
Receiver
Output
S
1
S
2
Test Point
V
CC
Figure2.ReceiverTimingTestLoadCircuit
Figure4.RS-485DriverTimingTestLoad#2Circuit
A
B
R
R
V
OD
V
OC
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP1481E-1485E_103_052413
INPUTS OUTPUTS
LINE
RE DE DI CONDITION B A
X 1 1 NoFault 0 1
X 1 0 NoFault 1 0
X 0 X X Z Z
X 1 X Fault Z Z
INPUTS OUTPUTS
RE DE A-B R
0 0 +0.2V 1
0 0 -0.2V 0
0 0 InputsOpen 1
1 0 X Z
Table1.TransmitFunctionTruthTable
Table2.ReceiveFunctionTruthTable
+3V
0V
DE
5V
V
OL
A
, B
0V
1.5V 1.5V
t
ZL
t
ZH
f = 1MHz; t
R
< 1ns ; t
F
< 1ns
V
OH
A
, B
2.3V
2.3V
t
LZ
t
HZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
+3V
0V
5V
0V
1.5V 1.5V
t
ZL
t
ZH
f = 1MHz; t
R
≤ 1ns; t
F
≤ 1ns
R
1.5V
1.5V
t
LZ
t
HZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
V
IL
V
IH
R
RE
Figure8.ReceiverEnableandDisableTimes
Figure7.ReceiverPropagationDelays
Figure6.DriverEnableandDisableTimes
V
OH
V
OL
R
1.5V 1.5V
t
PHL
f = 1MHz; t
R
10ns
; t
F
≤ 10ns
OUTPUT
V
OD2
+
V
OD2
–
A
– B
0V 0V
t
PLH
INPUT
≤
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP1481E-1485E_103_052413
6
AlogicLOWonRE(pin2)willenablethe
receiver,alogicHIGHonRE(pin2)willdis-
ablethereceiver.
ThereceiverfortheSP1481EandSP1485E
willoperateuptoatleast20Mbps.Thereceiver
foreachofthetwodevicesisequippedwiththe
fail-safefeature.Fail-safeguaranteesthatthe
receiveroutputwillbeinaHIGHstatewhen
theinputisleftunconnected.
Shutdown Mode
SP1481E
TheSP1481EisequippedwithaShutdown
mode.ToenabletheShutdownstate,both
the driver and receiver must be disabled
simultaneously.
AlogicLOWonDE(pin3)andalogicHIGH
onRE(pin2)willputtheSP1481EintoShut-
downmode.InShutdown,supplycurrentwill
droptotypically1μA.
DESCRIPTION
TheSP1481EandSP1485Earehalf-duplex
differentialtransceiversthatmeettherequire-
mentsofRS-485andRS-422.Fabricated
with aExar proprietary BiCMOS process,
theseproductsrequireafractionofthepower
ofolderbipolardesigns.
TheRS-485standardisidealformulti-drop
applicationsandforlong-distanceinterfaces.
RS-485allowsupto32driversand32receiv-
erstobeconnectedtoadatabus,makingit
anidealchoiceformulti-dropapplications.
Sincethecablingcanbeaslongas4,000
feet,RS-485transceiversareequippedwith
awide(-7Vto+12V)commonmoderange
to accommodate ground potential differ-
ences. Because RS-485 is a differential
interface,dataisvirtuallyimmunetonoise
inthetransmissionline.
Drivers
The driver outputs of the SP1481E and
SP1485Earedifferentialoutputsmeetingthe
RS-485andRS-422standards.Thetypical
voltageoutputswingwithnoloadwillbe0
Voltsto+5Volts.Withworstcaseloading
of54Ωacrossthedifferentialoutputs,the
driverscanmaintaingreaterthan1.5Vvolt-
agelevels.ThedriversoftheSP1481E,and
SP1485Ehaveanenablecontrollinewhich
isactiveHIGH.AlogicHIGHonDE(pin3)
willenablethedifferentialdriveroutputs.A
logic LOW on DE (pin 3) will tri-state the
driveroutputs.
The transmitters of the SP1481E and
SP1485E will operate up to at least
20Mbps.
Receivers
TheSP1481EandSP1485Ereceivershave
differential inputs with an input sensitivity
aslowas±200mV.Inputimpedanceofthe
receiversistypically15kΩ(12kΩminimum).
Awidecommonmoderangeof-7Vto+12V
allowsforlargegroundpotentialdifferences
between systems. The receivers of the
SP1481E and SP1485E have a tri-state
enablecontrolpin.
P1-P3P4-P6P7-P8

SP1481EEN-L/TR

Mfr. #:
Buy SP1481EEN-L/TR
Manufacturer:
MaxLinear
Description:
RS-422/RS-485 Interface IC 20MBPS HALF-DUPLEX +/-15KV ESD -40-85C
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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