Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
SP26LV432
HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE RECEIVER
JUNE 2011 REV. 1.0.1
GENERAL DESCRIPTION
The SP26LV432 is a quad differential line receiver
with three-state outputs designed to meet the EIA
specifications of the RS-422 serial protocol. The
SP26LV432 features Exar's BiCMOS process
allowing low power operational characteristics of
CMOS technology while meeting all of the demands
of the RS-422 serial protocol at 50Mbps under load.
The RS-422 protocol allows up to 10 receivers to be
connected to a multipoint bus transmission line. The
SP26LV432 features a receiver enable control
common to all four receivers and a high-Z output with
6mA source and sink capability. Since the cabling can
be as long as 4,000 feet, the RS-422 receivers of the
SP26LV432 are equipped with a wide (-7.0V to
+7.0V) common-mode input voltage range to
accommodate ground potential differences.
FEATURES
•Quad Differential Line Receivers
•Compatible with the EIA standard for RS-422 serial
protocol
•High-Z Output Control
•Switching Rates Up to 50Mbps
•14ns Typical Receiver Propagation Delays
•60mV Typical Input Hysteresis
•Single +3.3V Supply Operation
•Common Receiver Enable Control
•26LV32 industry standard footprint compatible
•Ideal For Use with SP26LV431, Quad Drivers
•-7.0V to +7.0V Common-Mode Input Voltage range
FIGURE 1. TYPICAL APPLICATION CIRCUIT
FIGURE 2. PIN OUT ASSIGNMENT
ORDERING INFORMATION
PART NUMBER PACKAGE OPERATING TEMPERATURE
RANGE DEVICE STATUS
SP26LV432CN-L 16-pin Narrow SOIC 0°C to +70°C Active
SP26LV432CN-L/TR 16-pin Narrow SOIC 0°C to +70°C Active
SP26LV432EN-L 16-pin Narrow SOIC -40°C to +85°C Active
SP26LV432EN-L/TR 16-pin Narrow SOIC -40°C to +85°C Active
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PIN DESCRIPTIONS
Pin Assignments
PIN NUMBER PIN NAME TYPE DESCRIPTION
1RI1B I Inverted RS-422 receiver input.
2 R1A I Non-inverted RS-422 Receiver input.
3RO1OTTL receiver output.
4ENABLE IReceiver input enable, active HIGH.
5RO2OTTL receiver output.
6RI2A I Non-inverted RS-422 Receiver input.
7RI2B I Inverted RS-422 receiver input.
8 GND Pwr Ground.
9RI3B I Inverted RS-422 receiver input.
10 RI3A I Non-inverted RS-422 Receiver input.
11 RO3OTTL receiver output.
12 ENABLE IReceiver input enable, active LOW.
13 RO4OTTL receiver output.
14 RI4A I Non-inverted RS-422 Receiver input.
15 RI4B I Inverted RS-422 receiver input.
16 VCC Pwr +3.0V to +3.6V power supply.
Pin type: I=Input, O=Output.
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.
VCC (Supply Voltage) 7.0V
VCM (Common Mode Range) ±14V
VDIFF (Differential Input Voltage) ±14V
VIN (Enable Input Voltage) Vcc + 1.5V
TSTG (Storage Temperature Range) -65°C to +150°C
IO (Maximum Current Per Output) ±25mA
Storage Temperature Range -65°C to + 150°C
Power Dissipation 16-pin PDIP
(derate 14.3mW/°C above +70°C)
1150mW
Power Dissipation 16-pin NSOIC
(derate 8.95mW/°C above +70°C)
725mW
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HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE RECEIVER REV. 1.0.1
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: THE FOLLOWING SPECIFICATIONS APPLY FOR VCC = +3.0V TO +3.6V WITH TA =
+25OC AND ALL MIN AND MAX LIMITS APPLY ACROSS THE RECOMMENDED OPERATING TEMPERATURE RANGE.
SYMBOL PARAMETERS MIN.TYP. MAX. UNITS CONDITIONS
VCC Supply Voltage 3.0 3.6 V
Enable Input Rise or Fall Times 3ns
Input Electrical Characteristics
VTH Minimum Differential Input Voltage -200 50 +200 mV VOUT = VOH or VOL,
-7V < VCM < +7V
RIN Input Resistance 5.0 kΩVIN = -7V, +7V, +10V
Other input = GND
IIN Input Current +1.25 +1.5 mA VIN = +10V, Other input = GND
IIN Input Current -1.5V -2.5V mA VIN = -10V, Other input = GND
VIH(EN) Minimum Enable HIGH Input Level
Voltage
2.0 V
VIL(EN) Maximum Enable LOW Input Level
Voltage
0.8 V
IEN Maximum Enable Input Current ±1.0 μAVIN = VCC or GND
VHYST Input Hysteresis 60 mV VCM = 0V
ICC Quiescent Supply Current 515 mA VCC = +3.3V, VDIFF = +1V
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REV. 1.0.1 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE RECEIVER
Output Electrical Characteristics
VOH Minimum HIGH Level Output Voltage 2.4 2.8 V VCC = +3.0V, VDIFF = +1V,
IOUT = -6mA
VOL Maximum LOW Level Output Voltage 0.2 0.5 V VCC = +3.0V, VDIFF = -1V,
IOUT = +6mA
IOZQ Maximum Tri-State Output Leakage
Current
±0.5 ±5.0 μAVOUT = VCC or GND,
ENABLE = VIL , ENABLE = VIH
Switching Characteristics
tPLH, tPHL Propagation Delays 14 35 ns CL = 50pF, VDIFF = 2.5V,
VCM = 0V, VCC = +3.3V
tRISE, tFALL Output Rise and Fall Times 510 ns CL = 50pF, VDIFF = 2.5V,
VCM = 0V, VCC = +3.3V
tPZH, tPZL Output Enable Time 40 ns CL = 50pF, RL = 1000Ω,
VDIFF = 2.5V, VCC = +3.3V
tPHZ, tPLZ Output Disable Time 40 ns CL = 50pF, RL = 1000Ω,
VDIFF = 2.5V, VCC = +3.3V
UNLESS OTHERWISE NOTED: THE FOLLOWING SPECIFICATIONS APPLY FOR VCC = +3.0V TO +3.6V WITH TA =
+25OC AND ALL MIN AND MAX LIMITS APPLY ACROSS THE RECOMMENDED OPERATING TEMPERATURE RANGE.
SYMBOL PARAMETERS MIN.TYP.MAX.UNITS CONDITIONS
FIGURE 3. SP26LV432 BLOCK DIAGRAM
FIGURE 4. PROPAGATION DELAY
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HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE RECEIVER REV. 1.0.1
FIGURE 5. TEST CIRCUIT FOR HIGH-Z OUTPUT TIMING
FIGURE 6. HIGH IMPEDANCE OUTPUT ENABLE AND DISABLE WAVEFORMS
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FIGURE 7. DIFFERENTIAL PROPAGATION DELAY VS TEMPERATURE
FIGURE 8. DIFFERENTIAL PROPAGATION DELAY VS SUPPLY VOLTAGE
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FIGURE 9. DIFFERENTIAL SKEW VS TEMPERATURE
FIGURE 10. DIFFERENTIAL SKEW VS SUPPLY VOLTAGE
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FIGURE 11. HIGH OUTPUT VOLTAGE VS CURRENT OVER TEMPERATURE
FIGURE 12. HIGH OUTPUT VOLTAGE VS CURRENT OVER SUPPLY VOLTAGE
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FIGURE 13. LOW OUTPUT VOLTAGE VS CURRENT OVER TEMPERATURE
FIGURE 14. LOW OUTPUT VOLTAGE VS CURRENT OVER SUPPLY VOLTAGE
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FIGURE 15. INPUT RESISTANCE VS INPUT VOLTAGE
FIGURE 16. INPUT CURRENT VS SUPPLY VOLTAGE
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FIGURE 17. TRANSITION VOLTAGE VS TEMPERATURE
FIGURE 18. TRANSITION VOLTAGE VS SUPPLY VOLTAGE
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FIGURE 19. SUPPLY CURRENT VS TEMPERATURE
FIGURE 20. DISABLED SUPPLY CURRENT VS SUPPLY VOLTAGE
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FIGURE 21. SUPPLY CURRENT VS DATA RATE
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1.0 PRODUCT DESCRIPTION
The SP26LV432 is a low-power quad differential line receiver designed for digital data transmission meeting
the specifications of the EIA standard RS-422 serial protocol. The SP26LV432 features Exar's BiCMOS
process allowing low power operational characteristics of CMOS technology while meeting all of the demands
of the RS-422 serial protocol up to 50Mbps under load in harsh environments.
The RS-422 standard is ideal for multi-drop applications and for long-distance communication. The RS-422
protocol allows up to 10 receivers to be connected to a data bus, making it an ideal choice for multi-drop
applications. Since the cabling can be as long as 4,000 feet, RS-422 Receivers have an input sensitivity of
200mV over the wide (-7.0V to +7.0V) common mode range to accommodate ground potential differences.
Internal pull-up and pull-down resistors prevent output oscillation on unused channels. Because the RS-422 is
a differential interface, data is virtually immune to noise in the transmission line.
The SP26LV432 accepts RS-422 levels and translates these into TTL or CMOS output levels. The SP26LV432
features active HIGH and active LOW receiver enable controls common to all four receiver channels see
Table 1. A logic HIGH on the ENABLE pin (pin 4) or a logic LOW on the ENABLE pin (pin 12) will enable the
receiver outputs. A logic LOW on the ENABLE pin (pin 4) and a logic HIGH on the ENABLE pin (pin 12) will
force the receiver outputs into high impedance (high-Z). Refer to the truth table in Table 1.
The RS-422 line receivers feature high source and sink current capability. All receivers are internally protected
against short circuits on their inputs. The receivers feature tri-state outputs with 6mA source and sink
capability. The typical receiver propagation delay is 14ns (35ns max). To minimize reflections, the multipoint
bus transmission line should be terminated at both ends in its characteristic impedance, and stub lenghts off
the main line should be kept as short as possible.
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FIGURE 22. TWO-WIRE BALANCED SYSTEM, RS-422
TABLE 1: TRUTH TABLE, ENABLE/DISABLE FUNCTION COMMON TO ALL FOUR RS-422 RECEIVERS
INPUT OUTPUT
LOW HIGH don’t care high-Z
HIGH don’t care VID ≥ VTH (max) HIGH
HIGH don’t care VID ≤ VTH (min) LOW
don’t care LOW VID ≥ VTH (max) HIGH
don’t care LOW VID ≤ VTH (min) LOW
HIGH don’t care Open HIGH
don’t care LOW Open HIGH
ENABLE ENABLE
PACKAGE DIMENSIONS (16 PIN NSOIC)
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HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE RECEIVER REV. 1.0.1
p
REVISION HISTORY
DATE REVISION DESCRIPTION
3/08/04 AProduction Release.
3/08/04 BInclude tape and reel p/n’s.
4/17/06 CFixed Truth Table typo page 1
9/05/08 1.0.0 Converted to Exar standard datasheet format. Added Ordering Information for -40C
to +85C operating temperature range NSOIC package. Changed revision to 1.0.0.
6/03/11 1.0.1 Remove SP26LV432CP-L option per PDN 110510-01
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NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to
improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that
the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specific application. While the information in this publication
has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the
failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless
EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has
been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately
protected under the circumstances.
Copyright 2011 EXAR Corporation
Datasheet June 2011.
Send your Serial Transceiver technical inquiry with technical details to: serialtechsupport@exar.com.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
SP26LV432
HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE RECEIVER REV. 1.0.1
