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LTC485CS8#TRPBF

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Analog Devices RS-485 / RS-422 ICs, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LTC485CS8#TRPBF

Analog Devices · RS-485 / RS-422 ICs · SOIC-8

LTC485CS8#TRPBF from Analog Devices, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 RO output Receiver output: when the receiver is enabled (RE low), RO goes high if A > B by 200mV and low if A < B by 200mV.
2 RE input Receiver output enable: a low enables the receiver output RO, and a high forces RO into a high-impedance state.
3 DE input Driver output enable: a high enables driver outputs A and B so the chip acts as a line driver, while a low forces the driver outputs into high impedance so the chip acts as a line receiver.
4 DI input Driver input: with the driver outputs enabled (DE high), a low on DI forces A low and B high, and a high on DI forces A high and B low.
5 GND power_in Ground connection.
6 A bidirectional Driver output / receiver input (non-inverting bus line); the driver output stays high-impedance over the -7V to 12V common mode range when disabled.
7 B bidirectional Driver output / receiver input (inverting bus line); the driver output stays high-impedance over the -7V to 12V common mode range when disabled.
8 VCC power_in Positive supply, specified as 4.75 V < VCC < 5.25 V.

Key specifications

Parameter Value
Manufacturer Analog Devices
Package SOIC-8
Category Interface
Pins 8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Differential Driver Output Voltage (Unloaded) VOD1 5 V IO = 0 2
Differential Driver Output Voltage (with Load), RS422 VOD2 2 V R = 50Ω (RS422) 2
Differential Driver Output Voltage (with Load), RS485 VOD2 1.5 5 V R = 27Ω (RS485), Figure 1 2
Change in Magnitude of Driver Differential Output Voltage for Complementary States ΔVOD 0.2 V R = 27Ω or R = 50Ω, Figure 1 2
Driver Common Mode Output Voltage VOC 3 V R = 27Ω or R = 50Ω, Figure 1 2
Change in Magnitude of Driver Common Mode Output Voltage for Complementary States Δ/VOC/ 0.2 V R = 27Ω or R = 50Ω, Figure 1 2
Supply Current, Outputs Enabled ICC 500 900 μA No Load, Pins 2, 3, 4 = 0V or 5V Outputs Enabled 3
Supply Current, Outputs Disabled ICC 300 500 μA No Load, Pins 2, 3, 4 = 0V or 5V Outputs Disabled 3
Driver Short-Circuit Current, VOUT = HIGH IOSD1 35 100 250 mA VO = -7V 3
Driver Short-Circuit Current, VOUT = LOW IOSD2 35 100 250 mA VO = 10V 3
Receiver Short-Circuit Current IOSR 7 85 mA 0V ≤ VO ≤ VCC 3
Driver Input to Output (tPLH) tPLH 10 30 50 ns RDIFF = 54Ω, CL1 = CL2 = 100pF, (Figures 3 and 5) 3
Driver Input to Output (tPHL) tPHL 10 30 50 ns RDIFF = 54Ω, CL1 = CL2 = 100pF, (Figures 3 and 5) 3
Driver Output to Output Skew tSKEW 5 10 ns 3
Driver Rise or Fall Time tr, tf 3 15 25 ns 3
Driver Enable to Output High tZH 40 70 ns CL = 100pF (Figures 4 and 6) S2 Closed 3
Driver Enable to Output Low tZL 40 70 ns CL = 100pF (Figures 4 and 6) S1 Closed 3
Driver Disable Time from Low tLZ 40 70 ns CL = 15pF (Figures 4 and 6) S1 Closed 3
Driver Disable Time from High tHZ 40 70 ns CL = 15pF (Figures 4 and 6) S2 Closed 3
Receiver Input to Output (tPLH) tPLH 30 90 200 ns RDIFF = 54Ω, CL1 = CL2 = 100pF, (Figures 3 and 7) 3
Receiver Input to Output (tPHL) tPHL 30 90 200 ns RDIFF = 54Ω, CL1 = CL2 = 100pF, (Figures 3 and 7) 3
Differential Receiver Skew tSKD 13 ns /tPLH, tPHL/ 3
Receiver Enable to Output Low tZL 20 50 ns CRL = 15pF (Figures 2 and 8) S1 Closed 3
Receiver Enable to Output High tZH 20 50 ns CRL = 15pF (Figures 2 and 8) S2 Closed 3
Receiver Disable from Low tLZ 20 50 ns CRL = 15pF (Figures 2 and 8) S1 Closed 3
Receiver Disable from High tHZ 20 50 ns CRL = 15pF (Figures 2 and 8) S2 Closed 3
Input High Voltage VIH 2 V DE, DI, RE 3
Input Low Voltage VIL 0.8 V DE, DI, RE 3
Input Current IIN1 -2 2 μA DE, DI, RE 3
Input Current (A, B), C-, I-Grade IIN2 1 mA DE = 0, VCC = 0V or 5.25V, VIN = 12V 3
Input Current (A, B), C-, I-Grade IIN2 -0.8 mA DE = 0, VCC = 0V or 5.25V, VIN = -7V 3
Differential Input Threshold Voltage for Receiver VTH -0.2 0.2 V -7V ≤ VCM ≤ 12V 3
Receiver Output High Voltage VOH 3.5 V IO = -4mA, VID = 200mV 3
Receiver Output Low Voltage VOL 0.4 V IO = 4mA, VID = -200mV 3
Three-State (High Impedance) Output Current at Receiver IOZR -1 1 μA VCC = Max, 0.4V ≤ VO ≤ 2.4V 3
Receiver Input Resistance (C-, I-Grade) RIN 12 kΩ -7V ≤ VCM ≤ 12V (C-, I-Grade) 3
Supply Voltage 12 V 2
Control Input Voltages -0.5 V Maximum printed as VCC + 0.5V 2
Driver Input Voltage -0.5 V Maximum printed as VCC + 0.5V 2
Driver Output Voltage -14 14 V 2
Receiver Input Voltage -14 14 V 2
Receiver Output Voltages -0.5 V Maximum printed as VCC + 0.5V 2
Lead Temperature (Soldering) 300 °C Soldering, 10 sec 2
Storage Temperature Range -65 150 °C 2
Operating Temperature Range (LTC485C) TA 0 70 °C Commercial grade, LTC485CS8#TRPBF 2
Positive Supply Voltage (VCC) VCC 4.75 5.25 V Pin 8 positive supply; VCC = 5V ±5% 5
Maximum Junction Temperature (S package) TJMAX 150 °C S (SOIC) package 2
Thermal Resistance, Junction to Ambient (S package) θJA 150 °C/W S (SOIC) package 2
Differential Input Hysteresis (Receiver Input Hysteresis) ΔVTH 70 mV VCM = 0V 3

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE (1.143, 1.651) OR TIN PLATE LEADS 11

CAD (KiCad official)

  • Symbol: LTC485CS8#TRPBF
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: ltc485cs8-trpbf-etched.step / ltc485cs8-trpbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ltc485cs8-trpbf.step / ltc485cs8-trpbf.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Analog Devices datasheet (14 pp, sha256 fb75b8732f524069, retrieved 2026-10-19, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF