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PDF XR33038 Data sheet ( Hoja de datos )

Número de pieza XR33038
Descripción WIDE SUPPLY 18V TOLERANT RS-485/RS-422 TRANSCEIVERS
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No Preview Available ! XR33038 Hoja de datos, Descripción, Manual

XR33032/35/38
WIDE SUPPLY 18V TOLERANT RS-485/RS-422 TRANSCEIVERS
FEBRUARY 2014
REV. 1.0.0
GENERAL DESCRIPTION
FEATURES
The XR33032/35/38 family of high performance half
duplex RS-485 transceivers are optimized to operate
over a wide range of supply voltage, from +2.8V to
+5.5V. The analog bus pins can withstand direct shorts
up to ±18V, and are protected against ESD events up
to ±15kV.
In an isolated application it may be more efficient to
use a remote power supply rather than generating an
isolated supply at every node. The XR33032/35/38
transceivers can operate with more than 2V IR drop in
the cable when utilizing a remote 5V power supply.
The transceivers draw less than 600µA, and typically
only 300µA when idling with the receivers active.
The receivers include full fail-safe circuitry, guarantee-
ing a logic-high receiver output when the receiver
inputs are open, shorted, or undriven. The receiver
input impedance is 96k(1/8 unit load), allowing up to
256 devices on the bus while preserving the full signal
margin.
+2.8V to +5.5V Operating Range
±18V Fault Tolerance on Analog Bus pins
Robust ESD (ElectroStatic Discharge) Protection:
±15kV IEC 61000-4-2 Air Gap Discharge
± 8kV IEC 61000-4-2 Contact Discharge
±15kV Human Body Model
± 4kV Human Body Model on non-bus pins
300µA Idle Current, 40nA Shutdown Current
Enhanced Receiver Fail-Safe Protection for Open,
Shorted, or Terminated but Idle Data Lines
Hot-Swap Glitch Protection on DE and RE Pins
Driver Short Circuit Current Limit and Thermal
Shutdown for Overload Protection
1/8th Unit Load Allows up to 256 Devices on Bus
Industry Standard 8 NSOIC Half Duplex Package
The drivers are protected by short circuit detection as
well as thermal shutdown, and maintain high imped-
ance in shutdown or when powered off. The XR33032
and XR33035 drivers are slew limited for reduced EMI
and error-free communication over long or untermi-
nated data cables.
The DE and RE pins include hot swap circuitry to pre-
vent false transitions on the bus during power-up or
live insertion, and can enter a low current shutdown
mode (40nA typically) for extreme power savings.
TYPICAL APPLICATIONS
Isolated Multipoint RS-485 Data Buses
Remote Nodes Powered by the Host
Building Automation and HVAC
Industrial Process Control Networks
Remote Utility Meter Reading
Energy Monitoring and Control
RO 1 R 8 VCC
RE 2
7 B/Z
DE 3
6 A/Y
DI 4 D 5 GND
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com

1 page




XR33038 pdf
XR33032/35/38
REV. 1.0.0
WIDE SUPPLY 18V TOLERANT RS-485/RS-422 TRANSCEIVERS
Unless otherwise noted: VCC = +2.8V to +5.5V, TA = -40C to +85C. Typical values are at VCC = 3.3V, TA = +25°C.
SYMBOL
PARAMETERS
MIN. TYP. MAX. UNITS
CONDITIONS
DRIVER AC CHARACTERISTICS
tDPLH
Driver Prop. Delay (Low to High)
tDPHL
Driver Prop. Delay (High to Low)
|tDPLH-tDPHL| Differential Driver Output Skew
tDR, tDF
Driver Differential Output
Rise or Fall Time
Maximum Data Rate
tDZH
Driver Enable to Output High
tDZL
tDHZ
tDLZ
tDZH(SHDN)
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Driver Enable from Shutdown to
Output High
tDZL(SHDN)
Driver Enable from Shutdown to
Output Low
tSHDN
Time to Shutdown
XR33032 (250kbps)
250 1500 ns
250 1500 ns
CL = 50pF, RL = 54,
20 200 ns Figure 6
350 1600 ns
250 kbps 1/tUI, Duty Cycle 40 to 60%
200 2500 ns
200 2500 ns CL = 50pF, RL = 500,
6 100 ns Figure 7
6 100 ns
5500
5500
ns
CL = 50pF, RL = 500,
Figure 7
ns
50 200 600 ns Notes 3
RECEIVER AC CHARACTERISTICS
XR33032 (250kbps)
tRPLH
Receiver Prop. Delay (Low to High)
tRPHL
Receiver Prop. Delay (High to Low)
|tRPLH-tRPHL| Receiver Propagation Delay Skew
200 ns
CL = 15pF, VID = ±2V,
200 ns VID Rise and Fall times < 15ns
30 ns Figure 8
Maximum Data Rate
250
kbps 1/tUI, Duty Cycle 40 to 60%
tRZH
Receiver Enable to Output High
50 ns
tRZL Receiver Enable to Output Low
tRHZ Receiver Disable from Output High
50 ns CL = 15pF, RL = 1k,
50 ns Figure 9
tRLZ Receiver Disable from Output Low
50 ns
tRZH(SHDN)
tRZL(SHDN)
Receiver Enable from Shutdown
to Output High
Receiver Enable from Shutdown
to Output Low
3500
3500
ns
CL = 15pF, RL = 1k,
Figure 9
ns
tSHDN
Time to Shutdown
50 200 600 ns Notes 3
5

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XR33038 arduino
XR33032/35/38
REV. 1.0.0
WIDE SUPPLY 18V TOLERANT RS-485/RS-422 TRANSCEIVERS
FIGURE 7. DRIVER ENABLE AND DISABLE TIMING TEST CIRCUITS & TIMING DIAGRAMS
Testing Z: DI = 0V
Testing Y: DI = VCC
DE
D
Z
RL
Y
VOUT
CL
3V
DE
0V
VOUT
VOH
VOL
1.5V
tDZH
VOH + VOL
2
Testing Z: DI = VCC
Testing Y: DI = 0V
D
DE
1.5V
tDHZ
VOH - 0.25V
VCC
Z
RL
VOUT
CL
Y
3V
DE
0V
VOUT
VOH
VOL
1.5V
tDZL
VOH + VOL
2
1.5V
tDLZ
VOL + 0.25V
11

11 Page







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