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PDF XR3178EID Data sheet ( Hoja de datos )

Número de pieza XR3178EID
Descripción 3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS
Fabricantes Exar 
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XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
DECEMBER 2009
REV. 1.0.0
GENERAL DESCRIPTION
FEATURES
The XR3170E - XR3178E family of RS-485 devices
are designed for reliable, bidirectional communication
on multipoint bus transmission lines. Each device
contains one differential driver and one differential
receiver. XR3172E, XR3175E and XR3178E are half-
duplex devices; other part numbers are full-duplex.
All devices comply with TIA/EIA-485 and TIA/EIA-422
standards. Lead free and RoHS compliant packages
are available for all models.
These devices are ruggedized for use in harsh
operating conditions over the entire common-mode
voltage range from -7V to +12V. Receivers are
specially designed to fail-safe to a logic high output
state if the inputs are left un-driven or shorted. All RS-
485 bus pins are protected against severe ESD
events up to +/-15kV (Air-Gap and Human Body
Model) and up to +/-8kV Contact Discharge (IEC
61000-4-2). Drivers are protected from excess
current flow caused by bus contention or output
short-circuits by both an internal current limit and a
thermal-overload shutdown. Devices are rated for
Industrial (-40 to +85°C) operating temperatures.
Receivers have exceptionally high input impedance,
which places only 1/8th the standard load on a shared
bus. Up to 256 transceivers may coexist while
preserving full signal margin.
All devices operate from a single 3.3V power supply
and draw negligible quiescent power. All versions
except the XR3171E, XR3174E and XR3177E may
independently enable and disable their driver and
receiver and enter a low power shutdown mode if
both driver and receiver are disabled. All outputs
maintain high impedance in shutdown or when
powered off.
3.3V Single Supply Operation
High Speed 20Mbps Data Rate
Slew Rate Limited - 250kbps And 500kbps Data
Rate
1/8th Unit Load, 256 Transceivers On Bus
Enhanced Failsafe For Receiver - Open, Short Or
Terminated Lines
Robust ESD Protection For RS-485 Pins
+/-15kV Air-Gap Discharge
+/-15kV Human Body Model
+/-8kV Contact Discharge
Hot Swap Glitch Protection
Driver Short Circuit Current Limit And Thermal
Shutdown For Overload Protection
Ultra-Low 650uA Quiescent Current
1µA Shutdown Mode
Industry Standard Package Footprints
TYPICAL APPLICATIONS
Motor Control
Building Automation
Security Systems
Remote Utility Meter Reading
Long Or Un-Terminated Transmission Lines
FIGURE 1. TYPICAL APPLICATION CIRCUIT
DE
XR3178E
B
DI RT
A
RO
B
STUB
A
DE
XR3178E
B
RT
A
BA
DI
RO
RE
DE
RE DE
RE
RE
DI RO
DI RO
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

1 page




XR3178EID pdf
REV. 1.0.0
XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
UNLESS OTHERWISE NOTED: VCC = +3.0V TO +3.6V WITH TA FROM -40OC TO +85OC. TYPICAL VALUES ARE AT
VCC = +3.3V AND 25OC.
SYMBOL
VOC
IOSD
VIH
VIL
VHYS
IIN
PARAMETERS
Change in Magnitude of Common
Mode Output Voltage
Driver Short Circuit Current Limit
MIN.
-0.2
-250
2.0
Logic Input Thresholds (DI, DE, RE)
Driver Input Hysteresis
Logic Input Current (DI, DE and RE)
-1
IOL Output Leakage Current (Full-Duplex
versions, Y and Z pins) Note 2
-100
RECEIVER DC CHARACTERISTICS
RIN Receiver Input Resistance
IIN Input Current (A, B pins)
96
-100
VIH,VIL
VOH
Receiver Differential Thresholds
(VA - VB)
Receiver Input Hysteresis
Receiver Output Voltage High
VOL Receiver Output Voltage Low
IOZ High-Z Receiver Output Current
-200
Vcc -
0.6
IOSC
Receiver Output Short Circuit Cur-
rent
TYP.
100
160
70
-55
-120
25
+/-
0.03
MAX. UNITS
CONDITIONS
0.2 V Figure 3, See Note 1
250 mA -7V VOUT 12V, Figure 5
V Logic Input High
0.8 V Logic Input Low
mV TA = 25°C
1 µA 0V IN +Vcc, after first tran-
sition, Note 2
125 µA Vout = 12V, DE = 0V, RE = 0V,
Vcc = 0V or 3.3V.
µA Vout = -7V, DE = 0V, RE = 0V,
Vcc = 0V or 3.3V.
K-7V VCM 12V
125 µA DE = 0V, Vcc = 0V or 3.3V, VIN
= 12V
µA DE = 0V, Vcc = 0V or 3.3V, VIN
= -7V
-50 mV -7V VCM 12V
mV VCM = 0V
V IOUT = -8mA, VID = -50mV
0.4
+/-1.0
+/-95
V IOUT = 8mA, VID = -200mV
µA Vcc = 3.3V,
0.40V Vout 2.4V
mA 0V VRO Vcc
SUPPLY AND PROTECTION
ICC1 Supply Current - Driver Enabled
650 950
ICC2 Supply Current - Shutdown Mode
1
TSD Thermal Shutdown Temperature
165
Thermal Shutdown Hysteresis
15
XR3170E, XR3171E, XR3172E
DRIVER AC CHARACTERISTICS
freq Max. Data Signaling Rate
250
µA No Load, DE = Vcc, DI = 0V or
Vcc
µA DE = 0V, RE = Vcc, DI = 0V or
Vcc
°C Junction temperature, Note 4
°C Note 4
kbps 1/tUI, Duty Cycle 40 to 60%
5

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XR3178EID arduino
REV. 1.0.0
XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
FIGURE 6. DRIVER PROPAGATION DELAY TEST CIRCUIT
Y
DI D
Z
3.3V
VOD
RL CL
54Ω 50pF
FIGURE 7. DRIVER PROPAGATION DELAY TIMING DIAGRAM
Vcc
DI
0V
Z
Y
VDIFF
VY –VZ
VO+
0V
VO
Vcc/2
VO 1/2VO
tPLH
tPHL
Vcc/2
1/2VO
tDPLH
90%
10%
tR
tDPHL
t SKEW = |t DPLH - tDPHL|
90%
10%
tF
FIGURE 8. DRIVER ENABLE AND DISABLE TIME TEST CIRCUIT 1
0 or Vcc DI
Y
D
Z
S1
CL = 50pF
GENERATOR
50Ω
OUT
RL = 500Ω
11

11 Page







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