SP337E Datasheet PDF - Exar

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SP337E
Exar

Part Number SP337E
Description 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
Page 18 Pages


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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



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SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 1. TYPICAL RS-232 AND RS-485 APPLICATION CIRCUITS
REV. 1.0.2
ORDERING INFORMATION
PART NUMBER
SP337EBCT-L
SP337EBCY-L
SP337EBET-L
SP337EBEY-L
SP337EUCT-L
SP337EUCY-L
SP337EUET-L
SP337EUEY-L
PACKAGE
28-pin WSOIC
28-pin TSSOP
28-pin WSOIC
28-pin TSSOP
28-pin WSOIC
28-pin TSSOP
28-pin WSOIC
28-pin TSSOP
2
OPERATING TEMPERATURE
RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
DEVICE STATUS
Active
Active
Active
Active
Active
Active
Active
Active



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REV. 1.0.2
PIN DESCRIPTIONS
SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
Pin Assignments
PIN # PIN NAME
TYPE
RS-232
DESCRIPTION
RS-485/RS-422
T3 Driver TTL input
T3 Driver TTL input
1 TI3 Input This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.
The pull-up is disabled in the SP337EU shutdown mode.
X* Only RS-485 mode
2
TXEN
Input This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.
The pull-up is disabled in the SP337EU shutdown mode.
3 TX4 Output
X*
T3(Z) Inverting Output
4 TX3 Output
T3 Driver Output
T3(Y) Non-Inverting Output
5 Vcc Power
Power Supply Voltage, between 3.3V and 5V
6 TX1 Output
T1 Driver Output
T1(Y) Non-Inverting Output
7 TX2 Output
T2 Driver Output
T1(Z) Inverting Output
8
GND
Power
Ground
9 C1+ Pump
Positive Terminal of Positive Flying Capacitor
10 V+ Pump
Vdd Storage Capacitor
11 C2+ Pump
Positive Terminal of Negative Flying Capacitor
12 C1- Pump
Negative Terminal of Positive Flying Capacitor
13 C2- Pump
Negative Terminal of Negative Flying Capacitor
14 V- Pump
Vss Storage Capacitor
15
RI1
Input R1 Receiver Input, 5k pull-down
R1(B) Receiver Inverting Input
16 RI2 Input R2 Receiver Input, 5k pull-down R1(A) Receiver Non-Inverting Input
17 RI3 Input R3 Receiver Input, 5k pull-down R3(A) Receiver Non-Inverting Input
18
RI4
Input R4 Receiver Input, 5k pull-down
R3(B) Receiver Inverting Input
19 RX1 Output
R1 Receiver Output
20 RX2 Output
R2 Receiver Output
X*
21 RX3 Output
R3 Receiver Output
22 RX4 Output
R4 Receiver Output
X*
23 RX5 Output
R5 Receiver Output
X*
24 RI5 Input R5 Receiver Input, 5k pull-down
X*
25 RS232/RS485 Input
Mode select, either RS-232 (low) or RS-485/422 (high) mode
26
RXEN
Input
Receiver enable for both RS-232 and RS-485/422 mode (Active low)
3



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SP337E
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
Pin Assignments
REV. 1.0.2
PIN # PIN NAME
TYPE
RS-232
DESCRIPTION
RS-485/RS-422
T1 Driver Input
T1 Driver Input
27 TI1 Input This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.
The pull-up is disabled in the SP337EU shutdown mode.
T2 Driver Input
X*
28 TI2 Input This pin has a 400k pull-up to Vcc in both RS-232 and RS-485 modes.
The pull-up is disabled in the SP337EU shutdown mode.
* Pins marked with an X in the above table are ignored or "don’t care" in the listed mode, provided
they do not exceed Vcc or go below ground. Some of these pins have a pull-up to Vcc which
remains active in both RS-232 and RS-485 mode, but is disabled in the SP337EU shutdown mode.
4



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SP337E 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER SP337E
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