SP3485CN-L

Half-Duplex RS-485/RS-422 Transceiver

The SP3485CN-L is a half-duplex rs-485/rs-422 transceiver from MaxLinear. View the full SP3485CN-L datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Official SP3485CN-L datasheet (PDF) — the source this page was extracted from.

Manufacturer

MaxLinear

SP3485CN-L Key Specifications

Parameter	Value
Data Rate	10Mbps
Duplex	Half
Mounting Type	Surface Mount
Number of Drivers/Receivers	1/1
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Protocol	RS422, RS485
Receiver Hysteresis	20 mV
Supplier Device Package	8-SOIC
Type	Transceiver
Supply Voltage	3V ~ 3.6V

SP3485CN-L Overview

Part: SP3485 — MaxLinear

Type: Half-Duplex RS-485/RS-422 Transceiver

Description: A 3.3V low power half-duplex transceiver that meets RS-485 and RS-422 serial protocols, supporting data rates up to 10Mbps and interoperable with 5.0V logic.

Operating Conditions:

Supply voltage: 3.3V ±5%
Operating temperature: -40°C to 85°C
Max data rate: 10 Mbps

Absolute Maximum Ratings:

Max supply voltage: 6.0V
Max junction temperature: 125°C
Storage temperature: -65°C to 150°C

Key Specs:

Differential output voltage (RS-485, R = 27Ω): 1.5 V (min)
Driver short circuit current: ±250 mA (-7V ≤ V O ≤ +12V)
Driver input to output propagation delay (t PLH/PHL): 17 ns (typ), 60 ns (max)
Receiver differential input threshold: -0.2 V (min) to 0.2 V (max)
Receiver input hysteresis: 20 mV (typ)
Receiver input resistance: 12 kΩ (min)
Receiver common-mode input voltage range: -7V to +12V
Supply current, no load (driver enabled): 425 μA (typ), 2000 μA (max)

Features:

RS-485 and RS-422 transceiver
Operates from a single 3.3V supply
Interoperable with 5.0V logic
Driver/receiver enable
-7V to +12V common-mode input voltage range
Allows up to 32 transceivers on the serial bus
Compatibility with industry standard 75176 pinout
Driver output short-circuit protection

Package:

8-pin SOIC

SP3485CN-L Features

■■ RS-485 and RS-422 transceiver
■■ Operates from a single 3.3V supply
■■ Interoperable with 5.0V logic
■■ Driver/receiver enable
■■ -7V to +12V common-mode input voltage range
■■ Allows up to 32 transceivers on the serial bus
■■ Compatibility with industry standard 75176 pinout
■■ Driver output short-circuit protection

Ordering Information - Back Page

SP3485CN-L Pin Configuration

Pin	Name	Description
1	RO	Receiver output
2	RE	Receiver output enable active LOW
3	DE	Driver output enable active HIGH
4	DI	Driver input
5	GND	Ground connection
6	A	Non-inverting driver output / receiver input
7	B	Inverting driver output / receiver input
8	V CC	Positive supply

SP3485CN-L Electrical Characteristics

Unless otherwise noted: T AMB = T MIN to T MAX and V CC = 3.3V ±5%.

PARAMETERS	MIN.	TYP.	MAX.	UNITS	CONDITIONS
SP3485 Driver DC Characteristics
Differential output voltage			Vcc	Volts	Unloaded; R = ∞Ω ; Figure 1
Differential output voltage	2		Vcc	Volts	With Load; R = 50Ω (RS-422); Figure 1
Differential output voltage	1.5		Vcc	Volts	With Load; R = 27Ω (RS-485); Figure 1
Change in magnitude of driver differential output voltage for complimentary states			0.2	Volts	R = 27Ω or R = 50Ω; Figure 1
Driver common mode output voltage			3	Volts	R = 27Ω or R = 50Ω; Figure 1
Input high voltage	2			Volts	Applies to DE, DI, RE
Input low voltage			0.8	Volts	Applies to DE, DI, RE
Input current			± 10	μA	Applies to DE, DI, RE
Driver short circuit current V OUT = HIGH			± 250	mA	-7V ≤ V O ≤ +12V; Figure 8
Driver short circuit current V OUT = LOW			± 250	mA	-7V ≤ V O ≤ +12V; Figure 8
SP3485 Driver AC Characteristics
Maximum data rate	10			Mbps	RE = V CC , DE = V CC
Driver input to output, t PLH		17	60	ns	Figures 2 & 9
Driver input to output, t PHL		17	60	ns	Figures 2 & 9
Differential driver skew		2	10	ns	\
Driver rise or fall time		5	20	ns	From 10%-90%; Figures 3 and 10
Driver enable to output high		35	120	ns	Figures 4 and 11
Driver enable to output low		30	120	ns	Figures 5 and 11
Driver disable time from low		20	120	ns	Figures 5 and 11
Driver disable time from high		20	120	ns	Figures 4 and 11
Driver enable from shutdown to output high, t PSH			250	ns	C L = 50pF, R L = 500Ω.
Driver enable from shutdown to output low, t PSL			250	ns	Figures 4, 5, and 11
Time to shutdown, t SHDN	50	200	600	ns	Notes 1 and 2

Storage Temperature ...................................-65˚C to 150˚C

Maximum Junction Temperature, T J ..........................125˚C

Power Dissipation .................................................... 600mW

(derate 6.90mW/°C above 70°C)

SP3485CN-L 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 of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

V CC ...............................................................................6.0V	V CC ...............................................................................6.0V
Input Voltages	Input Voltages
	Logic..................................... -0.3V to 6.0V
	Drivers .................................. -0.3V to 6.0V
	Receivers...........................................±15V
Output Voltages	Output Voltages
	Drivers ...............................................±15V
	Receivers.............................. -0.3V to 6.0V

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
SP3485	MaxLinear	—
SP3485CN-L/TR	MaxLinear	8-pin SOIC
SP3485EN-L	MaxLinear	SOIC-8
SP3485EN-L/TR	MaxLinear	8-SOIC (0.154", 3.90mm Width)

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