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PDF XR34350 Data sheet ( Hoja de datos )
| Número de pieza | XR34350 | |
| Descripción | RS-232/485/422 Serial Transceiver | |
| Fabricantes | Exar | |
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XR34350
RS-232/485/422 Serial Transceiver with
Internal Termination and Wide Output Swing
Description
The XR34350 is an advanced multiprotocol transceiver supporting
RS-232, RS-485, and RS-422 serial standards in a 40-pin
QFN package. Integrated cable termination and four configuration
modes allow all three protocols to be used interchangeably over a
single cable or connector with no additional switching components.
Full operation requires only four external charge pump capacitors.
The RS-485/RS-422 modes feature one driver and one receiver
(1Tx/1Rx) in both half and full duplex configurations. The RS-232
mode (3Tx/5Rx) provides full support of all eight signals commonly
used with the DB9 RS-232 connector. A dedicated diagnostic loopback
mode is also provided.
The high speed drivers operate up to 20Mbps in
RS-485/RS-422 modes, and up to 1Mbps in RS-232 mode.
All drivers can be slew limited to 250kbps in any mode to minimize
Electromagnetic Interference (EMI).
All transmitter outputs and receiver inputs feature robust Electrostatic
Discharge (ESD) protection to ±15kV IEC-61000-4-2 air gap,
±8kV IEC-61000-4-2 contact, and ±15kV Human Body Model (HBM).
Each receiver output has full fail-safe protection to avoid system
lockup, oscillation, or indeterminate states by defaulting to logic-
high output level when the inputs are open, shorted, or terminated
but undriven. No external biasing resistors are required.
The RS-232 receiver inputs include a 5kΩ pull-down to ground.
The RS-485/RS-422 receiver inputs are high impedance
(>96kΩ when termination is disabled), allowing up to 256 devices on a
single communication bus (1/8th unit load).
The XR34350 operates from a single power supply, either 3.3V or 5V,
with low idle current (2mA typical in all modes). The shutdown mode
consumes less than 10µA for low power standby operation.
Typical Application
FEATURES
■■ Rx enabled during Tx short-circuit
condition
■■ Pin selectable cable termination
■■ No external resistors required for RS-485/
RS-422 termination and biasing
■■ 3.3V or 5V single supply operation
■■ Robust ESD protection on bus pins
±15kV IEC 61000-4-2 (air gap)
± 8kV IEC 61000-4-2 (contact)
±15kV (HBM)
■■ Max data rate of 20Mbps in RS-485/
RS-422 modes and up to 1Mbps in
RS-232 modes
■■ Pin selectable 250kbps slew limiting
■■ 3 drivers, 5 receivers RS-232/V.28
■■ 1 driver, 1 receiver RS-485/RS-422
■■ High swing RS-232 driver outputs
(±10.0V no load)
Full and half duplex configuration
1/8th unit load, up to 256 receivers
on bus
■■ RS-485/RS-422 enhanced failsafe for
open, shorted, or terminated but idle inputs
■■ Space saving 40-pin 6mm x 6mm
QFN package
■■ Pin compatible with SP339E and SP338E
APPLICATIONS
■■ Dual protocol serial ports (RS-232 or
RS-485/RS-422)
■■ Industrial and process control equipment
■■ Point-of-sale equipment
■■ HVAC controls equipment
■■ Building security and automation
equipment
RS-232 or RS-485
UART XR34350
Multi-Protocol
XCVR
Figure 1. Typical Application
REV1B
1/20
1 page  
XR34350
Timing Characteristics
Unless otherwise noted: VCC = 3.3V ±5% or 5.0V ±5%, C1 to C4 = 0.1µF; TA = TMIN to TMAX. Typical values are at
VCC = 3.3V, TA = 25°C.
Symbol
Parameter
Conditions
Min Typ Max Units
All Modes
tENABLE
Enable from shutdown
tSHUTDOWN Enable to shutdown
RS-232, Data Rate = 250kbps, SLEW = VCC, One Transmitter Switching
Maximum data rate
RL = 3kΩ, CL = 1000pF
tRHL, tRLH
|tRHL - tRLH|
Receiver propagation delay
Receiver propagation delay skew
CL = 150pF, Figure 10
tDHL, tDLH
|tDHL - tDLH|
Driver propagation delay
Driver propagation delay skew
RL = 3kΩ, CL = 2500pF, Figure 11
tSHL, tSLH
Transition region slew rate from
3.0V to -3.0V or -3.0V to 3.0V
VCC = 3.3V, RL = 3kΩ to 7kΩ,
CL = 150pF to 2500pF, Figure 11
VCC = 3.3V, RL = 3kΩ to 7kΩ,
CL = 150pF to 2500pF, TA = 25°C,
Figure 11
RS-232, Data Rate = 1Mbps, SLEW = 0V, One Transmitter Switching
tRHL, tRLH
|tRHL - tRLH|
tDHL, tDLH
|tDHL - tDLH|
Maximum data rate
Receiver propagation delay
Receiver propagation delay skew
Driver propagation delay
Driver propagation delay skew
tSHL, tSLH
Transition region slew rate from
3.0V to -3.0V or -3.0V to 3.0V
RL = 3kΩ, CL = 250pF
CL = 150pF, Figure 10
RL = 3kΩ, CL = 1000pF, Figure 11
VCC = 3.3V, RL = 3kΩ to 7kΩ,
CL = 150pF to 1000pF, Figure 11
VCC = 3.3V, RL = 3kΩ to 7kΩ,
CL = 150pF to 1000pF, TA = 25°C,
Figure 11
1000
1000
ns
ns
250 kbps
100 ns
100 ns
1400
ns
600 ns
4 30 V/µs
6 30 V/µs
1 Mbps
100 ns
100 ns
300 ns
150 ns
15 150 V/µs
24 150 V/µs
REV1B
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5 Page 
Functional Block Diagrams by Mode (MODE1, MODE0) (Continued)
C3
0.1µF
C2
0.1µF
C1
0.1µF
C4
0.1µF
Cc
1.0µF
XR34350
L1 1
L2 2
L3 3
L4 4
L6 5
L7 6
L8 7
L9 8
VCC 9
GND 10
T1
120kΩ
R1
All pull-downs 330kΩ
30 R2
29 GND
28 R3
27 R4
26 GND
25 R6
24 R7
23 GND
22 R8
21 R9
Figure 4. Functional Block Diagram - Mode 10, RS-485 Half Duplex
REV1B
11/20
11 Page | ||
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