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PDF SP337E Data sheet ( Hoja de datos )
| Número de pieza | SP337E | |
| Descripción | 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP337E (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
MARCH 2011
REV. 1.0.2
GENERAL DESCRIPTION
The SP337E is a dual mode serial transceiver
containing both RS-232 and RS-485/422 line drivers
and receivers. The RS-232 mode provides three
drivers and five receivers to support all eight signals
commonly used in the DB9 serial port connector
(3TX/5RX). In RS-485 mode the device features two
independent high speed RS-485/422 transmit and
receive channels (2TX/2RX). The default RS-485
configuration is full-duplex, but half-duplex operation
can be obtained by tying together the TX and RI pins,
and the TXEN and RXEN signals.
The SP337E is pin compatible to Exar’s SP334.
The SP337EB features a maximum data rate of
250kbps in RS-232 mode and a maximum data rate
of 15Mbps in RS-485. However, the SP337EU
features a maximum data rate of 1Mbps in RS-232
mode and a maximum data rate of 15Mbps in RS-485
mode.
The Exar-patented high efficiency charge pumps
(5,306,954) deliver true RS-232 driver output
voltages from a single power supply from 3.3V to 5V.
Charge pump outputs are self-monitored to minimize
power consumption. The SP337E requires only four
0.1μF capacitors for complete functionality.
All RS-485 receivers or transceivers feature high
impedance inputs which allow up to 256 transceivers
on a single shared bus. When configured in RS-485
mode, each driver may be individually enabled or put
into tri-state, simplifying use on shared buses or for
bidirectional communication. The RS-485/422 drivers
can be disabled (high-Z output) by the TXEN enable
pin. The RS-232 receiver outputs can be disabled by
the RXEN enable pin.
All receivers have advanced failsafe protection to
prevent oscillation when inputs are un-connected. In
RS-232 mode, each receiver input has a 5kΩ pull-
down to ground. in RS-485 mode, receivers will
default to output logic 1 if inputs are floating, shorted,
or open but terminated.
All driver outputs and receiver inputs are protected
against ESD strikes up to +/-15,000 volts.
FEATURES
• 3.3V to 5V Single Supply Operation
• Robust +/-15kV ESD Protection
■ Human Body Model
• Max Data Rate of 15Mbps in RS-485 mode
and up to 1Mbps in RS-232 mode (SP337EU)
• 3 Drivers, 5 Receivers RS-232/V.28
• 2 Drivers, 2 Receivers RS-485/RS-422
■ Full-Duplex Configuration
■ 1/8th Unit Load, up to 256 receivers on bus
• RS-485 Advanced Failsafe on Open, Short or
Terminated Lines
• Full Differential Driver Tri-State (Hi-Z) Control
• Receiver Output Tri-State Control
• WSOIC-28 or TSSOP-28 Package
TYPICAL APPLICATIONS
• Dual Protocol Serial Ports (RS-232 or RS-485)
• Industrial Computers
• Industrial and Process Control Equipment
• Point-Of-Sales Equipment
• Networking Equipment
• HVAC Controls Equipment
• Building Security Equipment
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
1 page  
REV. 1.0.2
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the
specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent
damage to the device.
Supply Voltage VCC
Receiver Input VIN (DC Input Voltage)
Input Voltage at TTL input Pins
+6.0V
-16V to +16V
-0.3V to Vcc + 0.5V
Driver Output Voltage (from Ground)
-7.5V to +12.5V
Short Circuit Duration, TXout to GND
Continuous
Storage Temperature Range
-65°C to + 150°C
Lead Temperature (soldering, 10s)
+300°C
Power Dissipation 28-pin SOIC-W
(derate 17mW/°C above +70°C)
938mW
Power Dissipation 28-pin TSSOP
(derate 12mW/°C above +70°C)
657mW
CAUTION:
ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused
devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be
discharged to the destination socket before devices are removed.
ELECTRICAL CHARACTERISTICS
UNLESS OTHERWISE NOTED: VCC = +3.3V +/-5% OR +5.0V +/-5%, C1-C4 = 0.1μF; TA = TMIN TO TMAX.
TYPICAL VALUES ARE AT VCC = 3.3V, TA = +25OC.
SYMBOL
PARAMETERS
MIN. TYP. MAX. UNITS
CONDITIONS
DC CHARACTERISTICS
ICC Supply Current (RS-232)
ICC Supply Current (RS-485)
ICC
Vcc Shutdown Current
(SP337EU only)
1.5 6.0 mA No Load, RS232/RS485 = 0V
7.0 15 mA No Load, RS232/RS485 = Vcc
1.0
10.0
μA
TXEN = 0V, RXEN = Vcc
(SP337EU only)
TRANSMITTER and LOGIC INPUT PINS: Pins 1, 2, 25, 26, 27, 28
VIH Logic Input Voltage HIGH
2.0
VIH Logic Input Voltage HIGH
2.4
VIL Logic Input Voltage LOW
0.8
IIL Logic Input Leakage Current
1.0
IPU Logic Input Pull-up Current
15.0
VHYS
Logic Input Hysteresis
0.5
RS-232 and RS-485/422 RECEIVER OUTPUTS: Pins 19, 20, 21, 22, 23
V Vcc = 3.3V
V Vcc = 5.0V
V
μA Input High (Vin = Vcc)
μA Input Low (Vin = 0V)
V
VOH Receiver Output Voltage HIGH
VOL Receiver Output Voltage LOW
Vcc-0.6
V IOUT = 1.0mA
0.4 V IOUT = -3.2mA
5
5 Page 
SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 10. RS-485 DRIVER ENABLE AND DISABLE TIMING DIAGRAM 2
DE
OUT
VOL
tDZL
VOM = (VOL + Vcc)/2
Vcc/2
Vcc
0
tDLZ
0.25V
FIGURE 11. RS-485 RECEIVER PROPAGATION DELAY TEST CIRCUIT
A
VID B R
RE
OUT
CL
15pF
FIGURE 12. RS-485 RECEIVER PROPAGATION DELAY TIMING DIAGRAM
A
B
OUT
1.5V
tPHL
+1V
tPLH
-1V
VOH
VOL
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet SP337E.PDF ] | |
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