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 allowing up to 32 transceivers on the bus.

Operating Conditions:

• Supply voltage: 3.3V ±5%
• Operating temperature: -40 to 85 °C
• Max data rate: 10 Mbps
• Common-mode input voltage range: -7V to +12V

Absolute Maximum Ratings:

• Max supply voltage: 6.0V
• Max continuous current: ±60 mA (Receiver Output Current)
• Max junction/storage temperature: 125 °C (Junction Temperature)

Key Specs:

• Differential output voltage (RS-485 load): 1.5V min (R = 27Ω)
• Driver short circuit current: ±250 mA (-7V ≤ V O ≤ +12V)
• Driver input to output propagation delay (t PLH, t PHL): 17 ns typ, 60 ns max
• Differential input threshold: -0.2V to 0.2V (-7V ≤ V CM ≤ 12V)
• Receiver input hysteresis: 20 mV typ
• Receiver input resistance: 12 kΩ min (-7V ≤ V CM ≤ 12V)
• Supply current, no load: 300 μA typ (RE = 0V, DI = 0V or V CC , DE = 0V)
• Interoperable with 5.0V logic

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

• ■■ 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

SP3485EN-L Pinout

Package: DIP-8

Notes

• SP3485EN-L is an 8-pin DIP RS-485 transceiver
• Pin numbering confirmed from pinout diagram (top view)
• RE and DE are active-low and active-high control inputs respectively
• A and B are the differential bus lines for RS-485 communication

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

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

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

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

(derate 6.90mW/°C above 70°C)

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.