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SP483 / SP485 Low Power Half-Duplex RS-485 Transceivers FEATURES • +5V Only • Low Power BiCMOS • Driver / Receiver Enable • Slew Rate Limited Driver for Low EMI (SP483) • Low Power Shutdown mode (SP483) • RS-485 and RS-422 Drivers/Receivers DESCRIPTION The SP483 and SP485 are a family of half-duplex transceivers that meet the specifications of RS-485 and RS-422. Their BiCMOS design allows low power operation without sacrificing performance. The SP485 meets the requirements of RS-485 and RS-422 up to 5Mbps. Ad- ditionally, the SP483 is equipped with a low power Shutdown mode. The SP483 is internally slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up to 250kbps. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_SP485_0_0627 

ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those Output Voltages indicated in the operation sections of the specifications Logic.........................-0.3V to (Vcc + 0.5V) below is not implied. Exposure to absolute maximum Drivers.............................................+/-5V rating conditions for extended periods of time may Receivers..................-0.3V to (Vcc + 0.5V) affect reliability. Storage Temperature.......................-65˚C to +150˚C Power Dissipation V .......................................................................+7V CC 8-pin NSOIC...................................................500mW Input Voltages Logic.........................-0.3V to (Vcc + 0.5V) Drivers......................-0.3V to (Vcc + 0.5V) Receivers.........................................+/-5V ELECTRICAL CHARACTERISTICS T to T and V = 5V +/-5% unless otherwise noted. MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP483/SP485 DRIVER DC Characteristics Differential Output Voltage Vcc Volts Unloaded; R = ∞ ; see figure 1 Differential Output Voltage 2 Vcc Volts With Load; R = 50Ω (RS-422); see figure  Differential Output Voltage .5 Vcc Volts With Load; R = 27Ω (RS-485); see figure  Change in Magnitude of Driver 0.2 Volts R = 27Ω or R = 50Ω; see figure 1 Differential Output Voltage for Complimentary states Driver Common Mode Output 3 Volts R = 27Ω or R = 50Ω; see figure 1 Voltage Input High Voltage 2.0 Volts Applies to DE, DI, RE Input Low Voltage 0.8 Volts Applies to DE, DI, RE Input Current +/-0 µA Applies to DE, DI, RE Driver Short Circuit Current, 250 mA -7V ≤ V ≤ +12V O V = HIGH OUT Driver Short Circuit Current, 250 mA -7V ≤ V ≤ +12V O V = LOW OUT SP485 DRIVER AC Characteristics Maximum Data Rate 5 Mbps RE = 5V, DE = 5V Driver Input to Output, t 30 60 ns Figures 3 and 5, R = 54Ω, PLH DIFF C = C = 00pF L L2 Driver Input to Output, t 30 60 ns Figures 3 and 5, R = 54Ω, PHL DIFF C = C = 00pF L L2 Driver Skew 5 0 ns Figures 3 and 5, t = |t - t | SKEW DPHL DPLH Driver Rise or Fall Time 5 40 ns From 0%-90%; R = 54Ω DIFF C = C = 100pF; see figures 3 L L2 and 5 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_485_0_0627 2

ELECTRICAL CHARACTERISTICS T to T and V = 5V +/-5% unless otherwise noted. MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP485 DRIVER (continued) AC Characteristics Driver Enable to Output High 40 70 ns C = 100pF, see figures 4 and 6, L S closed 2 Driver Enable to Output Low 40 70 ns C = 100pF, see figures 4 and 6, L S closed  Driver Disable Time from High 40 70 ns C = 15pF, see figures 2 and 8, L S closed 2 Driver Disable Time from Low 40 70 ns C = 15pF, see figures 2 and 8, L S closed  SP483/SP485 RECEIVER DC Characteristics Differential Input Threshold -0.2 +0.2 Volts -7V ≤ V ≤ +12V CM Input Hysteresis 0 mV V = 0V CM Output Voltage High 2.4 5 Volts I = -4mA, V = +200mV O ID Output Voltage Low 0.0 0.4 Volts I = +4mA, V = -200mV O ID Three-State ( High Impedance) +/- µA 0.4V ≤ V ≤ 2.4V; RE = 5V O Output Current Input Resistance 2 5 kΩ -7V ≤ V ≤ +12V CM Input Current (A, B); V = 2V +.0 mA DE = 0V, V = 0V or 5.25V, IN CC V = 2V IN Input Current (A, B); V = -7V -0.8 mA DE = 0V, V = 0V or 5.25V, IN CC V = -7V IN Short-Circuit Current 95 mA 0V ≤ V ≤ V CM CC SP485 RECEIVER AC Characteristics Maximum Data Rate 5 Mbps RE = 0V, DE = 0V Receiver Input to Output 20 45 200 ns t Figures 3 and 7, PLH ; R = 54Ω, C = C = 00pF DIFF L L2 Receiver Input to Output 20 45 200 ns t Figures 3 and 7, PHL ; R = 54Ω, C = C = 00pF DIFF L L2 Differential Receiver Skew 3 ns R = 54Ω, C = C = 00pF, DIFF L L2 |t - t | Figures 3 and 7 PHL PLH Receiver Enable to Output Low 45 70 ns C = 5pF, Figures 2 and 8; RL S Closed  Receiver Enable to Output High 45 70 ns C = 5pF, Figures 2 and 8; RL S Closed 2 Receiver Disable from LOW 45 70 ns C = 5pF, Figures 2 and 8; RL S Closed  Receiver Disable from High 45 70 ns C = 5pF, Figures 2 and 8; RL S Closed 2 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_SP485_0_0627 3

ELECTRICAL CHARACTERISTICS T to T and V = 5V +/-5% unless otherwise noted. MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS POWER REQUIREMENTS Supply Voltage V +4.75 +5.25 Volts CC Supply Current SP485 900 µA No Load; RE, DI = 0V or V ; CC DE = V CC 900 µA No Load; RE = 0V, DI = 0V or 5V; DE = 0V SP483 600 µA No Load; RE, DI = 0V or V ; CC DE = V CC 600 µA No Load; RE = 0V, DI = 0V or 5V; DE = 0V SP483 0 µA Shutdown Mode; DE = 0V, RE = V CC ENVIRONMENTAL AND MECHANICAL Operating Temperature Commercial (_C_) 0 70 ºC Industrial (_E_) -40 +85 ºC Storage Temperature -65 +50 ºC Package: Plastic DIP (_P), NSOIC (_N) Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_485_0_0627 4

ELECTRICAL CHARACTERISTICS T to T and V = 5V +/-5% unless otherwise noted. MIN MAX CC PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP483 DRIVER AC Characteristics Maximum Date Rate 250 kbps Driver Input to Output, t 250 800 2000 ns t ; R = 54Ω, C = C = 00pF, PLH PLH DIFF L L2 see figures 3 and 5 Driver Input to Output, t 250 800 2000 ns t ; R = 54Ω, C = C = 00pF, PHL PHL DIFF L L2 see figures 3 and 5 Driver Skew 00 800 ns see figures 3 and 5, t = |t - t | SKEW DPHL DPLH Driver Rise or Fall Time 250 2000 ns From 0%-90%; R = 54Ω DIFF C = C = 00pF; see Figures 3 L L2 and 5 Driver Enable to Output High 250 2000 ns C = 100pF, see figures 4 and 6, L S closed 2 Driver Enable to Output Low 250 2000 ns C = 100pF, see figures 4 and 6, L S closed  Driver Disable Time from High 300 3000 ns C = 15pF, see figures 4 and 6, L S closed 2 Driver Disable Time from Low 300 3000 ns C = 15pF, see figures 4 and 6, L S closed  SP483 RECEIVER AC Characteristics Maximum Data Rate 250 kbps Receiver Input to Output 250 2000 ns t , t ; Figures 3 and 7: PLH PHL R = 54Ω, C = C = 00pF DIFF L L2 Differential Receiver Skew 00 ns R = 54Ω, C = C = 00pF, DIFF L L2 |t - t | see Figures 3 and 7 PHL PLH Receiver Enable to Output Low 20 50 ns C = 5pF, Figures 2 and 8; RL S Closed  Receiver Enable to Output High 20 50 ns C = 5pF, Figures 2 and 8; RL S Closed 2 Receiver Disable from LOW 20 50 ns C = 5pF, Figures 2 and 8; RL S Closed  Receiver Disable from High 20 50 ns C = 5pF, Figures 2 and 8; RL S Closed 2 SP483 Shutdown Timing Time to Shutdown 50 200 600 ns RE = 5V, DE = 0V Driver Enable from Shutdown 2000 ns C = 00pF; See Figures 4 and 6; L to Output High S Closed 2 Driver Enable from Shutdown 2000 ns C = 00pF; See Figures 4 and 6; L to Output Low S Closed  Receiver Enable from 2500 ns C = 5pF; See Figures 4 and 6; L Shutdown to Output High S Closed 2 Receiver Enable from 2500 ns C = 5pF; See Figures 4 and 6; L Shutdown to Output Low S Closed  Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_SP485_0_0627 5

PIN FUNCTION Pin  - RO - Receiver Output Pin 2 - RE - Receiver Output Enable Active LOW Pin 3 - DE - Driver Output Enable Active HIGH Pin 4 - DI - Driver Input Pin 5 - GND - Ground Connection Pin 6 - A - Driver Output / Receiver input Non-Inverting Pin 7 - B - Driver Output / Receiver Input Inverting Pin 8 - Vcc - Positive Supply 4.75V ≤ Vcc ≤ 5.25V TEST CIRCUITS 1kΩ A Test Point Receiver R Output S1 VCC VOD CRL 1kΩ VOC R B S2 Figure . Driver DC Test Load Circuit Figure 2. Receiver Timing Test Load Circuit V DI A RL CL1 A RO Output 500Ω S1 CC B B Under CL2 15pF Test CL S 2 Figure 3. RS-485 Driver/Receiver Timing Test Figure 4. Driver Timing Test Load #2 Circuit fSP485 = 1MHz;fSP483 = 100kHz;tR≤ 10ns; tF ≤ 10ns +3V DRIVER INPUT 1.5V 1.5V 0V tPLH tPHL B DRIVER VO 1/2VO 1/2VO OUTPUT A tDPLH tDPHL DIFFERENTIAL VO+ OUTPUT 0V VA – VB VO– tR tF tSKEW = |tDPLH - tDPHL| Figure 5. Driver Propagation Delays Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_485_0_0627 6

FUNCTION TRUTH TABLES INPUTS OUTPUTS INPUTS OUTPUTS LINE RE DE DI CONDITION A B RE DE A - B R X   No Fault  0 0 0 +0.2V  X  0 No Fault 0  0 0 -0.2V 0 X 0 X X Z Z 0 0 Inputs Open  X  X Fault Z Z  0 X Z Table . Transmit Function Truth Table Table 2. Receive Function Truth Table SWITCHING WAVEFORMS fSP485 = 1MHz;fSP483 = 100kHz;tR≤ 10ns; tF ≤ 10ns +3V DE 1.5V 1.5V 0V tZL tLZ 5V A, B 2.3V Output normally LOW 0.5V VOL VOH Output normally HIGH 0.5V A, B 2.3V 0V tZH tHZ Figure 6. Driver Enable and Disable Times V + OD2 A – B 0V 0V V – INPUT OD2 V OH R 1.5V 1.5V OUTPUT V OL tPHL tPLH fSP485 = 1MHz;fSP483 = 100kHz;tR≤ 10ns; tF ≤ 10ns t = |t - t | SKEW PLH PHL Figure 7. Receiver Propagation Delays fSP485 = 1MHz;fSP483 = 100kHz;tR≤ 10ns; tF ≤ 10ns +3V RE 1.5V 1.5V 0V tZL tLZ 5V R 1.5V Output normally LOW 0.5V VIL VIH Output normally HIGH 0.5V R 1.5V 0V tZH tHZ Figure 8. Receiver Enable and Disable Times Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_SP485_0_0627 7

DESCRIPTION The SP483 and SP485 are half-duplex dif- Receivers ferential transceivers that meet the require- SP483 and SP485 ments of RS-485 and RS-422. Fabricated with an Exar proprietary BiCMOS process, The SP483 and SP485 receivers have dif- this product requires a fraction of the power ferential inputs with an input sensitivity as of older bipolar designs. low as ±200mV. Input impedance of the receivers is typically 15kΩ (12kΩ minimum). The RS-485 standard is ideal for multi-drop A wide common mode range of -7V to +2V applications and for long-distance interfaces. allows for large ground potential differences RS-485 allows up to 32 drivers and 32 receiv- between systems. The receivers of the ers to be connected to a data bus, making it SP483 and SP485 have a tri-state enable an ideal choice for multi-drop applications. control pin. A logic LOW on RE (pin 2) will Since the cabling can be as long as 4,000 enable the receiver, a logic HIGH on RE (pin feet, RS-485 transceivers are equipped with 2) will disable the receiver. a wide (-7V to +2V) common mode range to accommodate ground potential differ- The receiver for the SP485 will operate up ences. Because RS-485 is a differential to at least 0Mbps. The SP483 receiver interface, data is virtually immune to noise is rated for data rates up to 250kbps. The in the transmission line. receiver for each of the three devices is equipped with the fail-safe feature. Fail- Drivers safe guarantees that the receiver output SP483 and SP485 will be in a HIGH state when the input is left unconnected and floating. The driver outputs of the SP483 and SP485 are differential outputs meeting the RS-485 Shutdown Mode and RS-422 standards. The typical voltage SP483 output swing with no load will be 0 Volts to +5 Volts. With worst case loading of 54Ω The SP483 is equipped with a Shutdown across the differential outputs, the drivers can mode. To enable the shutdown state, both maintain greater than .5V voltage levels. driver and receiver must be disabled simul- The drivers of the SP483 and SP485 have taneously. A logic LOW on DE (pin 3) and a an enable control line which is active HIGH. Logic HIGH on RE (pin 2) will put the SP483 A logic HIGH on DE (pin 3) will enable the into Shutdown mode. In Shutdown, supply differential driver outputs. A logic LOW on the current will drop to typically µA. DE(pin 3) will tri-state the driver outputs. The transmitters of the SP485 will operate up to at least 5Mbps. The SP483 has internally slew rate limited driver outputs to minimize EMI. The maximum data rate for the SP483 driver is 250kbps. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_485_0_0627 8

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_SP485_0_0627 9

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_485_0_0627 0

ORDERING INFORMATION Model Temperature Range Package Types SP483CN-L .........................................................................0°C to +70°C ................................................................................................8-pin NSOIC SP483CN-L/TR ...................................................................0°C to +70°C ................................................................................................8-pin NSOIC SP483EN-L........................................................................ -40°C to +85°C...............................................................................................8-pin NSOIC SP483EN-L/TR.................................................................. -40°C to +85°C...............................................................................................8-pin NSOIC SP485CN-L .........................................................................0°C to +70°C ................................................................................................8-pin NSOIC SP485CN-L/TR ...................................................................0°C to +70°C ................................................................................................8-pin NSOIC SP485CS-L......................................................................... 0°C to +70°C.................................................................................................8-pin PDIP SP485EN-L........................................................................ -40°C to +85°C...............................................................................................8-pin NSOIC SP485EN-L/TR.................................................................. -40°C to +85°C...............................................................................................8-pin NSOIC SP485ES-L........................................................................ -40°C to +85°C...............................................................................................8-pin PDIP Note: /TR = Tape and Reel REVISION HISTORy DATE REVISION DESCRIPTION 07/28/04 -- Legacy Sipex Datasheet 07/4/0 .0.0 Convert to Exar Format. Update ordering information as a result of discontinued Lead type package options per PDN 0826-0. Remove all options and reference to SP48; Part is EOL. Remove "GND" entry from Minimum column of SP483/485 driver DC Characteristic paramter "Differential output voltage - Unloaded". June 20 .0. Remove Driver Short Circuit Current minimum. Change Vcc ABS MAX Rating from +2V to +7V. Add 2k ohm minimum value to receiver Input Resistance. Change SP485 receiver propagation delay MIN and TyP to 20 and 45ns respectively, receiver Enable and Disable TyP and MAX to 45 and 70ns respectively. Remove SP483CS-L and SP483ES-L ordering part number per PDN 050-0. Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil- ity. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein 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 writting, 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 20 EXAR Corporation Datasheet June 20 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. Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP483_SP485_0_0627 

The content of this document is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by MaxLinear, Inc.. MaxLinear, Inc. assumes no responsibility or liability for any errors or inaccuracies that may appear in the informational content contained in this guide. Complying with all applicable copyright laws is the responsibility of the user. Without limiting the rights under copyright, no part of this document may be reproduced into, stored in, or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of MaxLinear, Inc. Maxlinear, Inc. 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 MaxLinear, Inc. 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 MaxLinear, Inc. is adequately protected under the circumstances. MaxLinear, Inc. may have patents, patent applications, trademarks, copyrights, or other intellectual property rights covering subject matter in this document. Except as expressly provided in any written license agreement from MaxLinear, Inc., the furnishing of this document does not give you any license to these patents, trademarks, copyrights, or other intellectual property. Company and product names may be registered trademarks or trademarks of the respective owners with which they are associated. © 2017 MaxLinear, Inc. All rights reserved

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: E xar: SP485RCP-L SP483EN-L SP483ECN-L SP485CS-L SP485REN-L SP483ECP-L SP483EEN-L SP483CN-L SP485CN-L SP485RCN-L SP483EN-L/TR SP483EEN-L/TR SP483ECN-L/TR SP485CN-L/TR SP485REP-L SP483CN-L/TR SP483EEP-L SP485REN-L/TR SP485RCN-L/TR