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Número de pieza | XR3173EID | |
Descripción | 3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS | |
Fabricantes | Exar | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de XR3173EID (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
No Preview Available ! 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 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.
KΩ -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
5 Page 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 |
Páginas | Total 24 Páginas | |
PDF Descargar | [ Datasheet XR3173EID.PDF ] |
Número de pieza | Descripción | Fabricantes |
XR3173EID | 3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS | Exar |
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