SIT3088E

DESCRIPTION

Overview

Part: SIT3088E

Type: RS-485 Transceiver

Key Specs:

  • Supply Voltage Range: 3.0V to 5.5V
  • ESD Protection (Human Body Model): ±15kV
  • Bus Withstand Voltage: ±15V
  • Unit Load: 1/8
  • Max Transceivers on Bus: 256
  • Max Data Transmission Rate: 14Mbps
  • Operating Temperature Range: -40°C to 125°C

Features:

  • Half-Duplex operation
  • Driver Short-Circuit Output Protection
  • Low Power Off Function
  • Receiver Open-Circuit Failure Protection (Fail-safe)
  • Strong Anti-Noise Ability
  • Integrated Transient Voltage Suppression Function
  • Independent driver and receiver enable/disable
  • Current-limiting protection
  • Over-voltage protection
  • Green and environmentally friendly lead-free package

Applications:

  • null

Package:

  • SOP8
  • DIP8
  • MSOP8/8μMAX/VSSOP8
  • DFN3*3-8

Applications

4.1 Bus Networking: SIT3088E RS485 transceiver is designed for bidirectional data communication on multi-point bus transmission line. Figure 9 shows a typical network application circuit. These devices can also be used as linear repeaters with cables longer than 4000 feet. In order to reduce reflection, terminal matching should be carried out at both ends of the transmission line with its characteristic impedance, and the length of branch lines outside the main line should be as short as possible.

Figure 9 Bus type RS485 half-duplex communication network

4.2 Hand in hand Networking: also known as daisy chain topology, is the standard and specification of RS485 bus wiring, and is the RS485 bus topology recommended by TIA and other organizations. The wiring mode is that the main control equipment and a plurality of slave control equipment form a hand-held connection mode, as shown in Figure 10, and the hand-held mode is no branches. This wiring mode has the advantages of small signal reflection and high communication success rate.

Figure10 Hand in hand RS485 half-duplex communication network

4.3 Bus port protection: in severe environment, RS485 communication port is usually provided with electrostatic protection, lightning surge protection and other additional protection, and even the plan to prevent 380V market electricity access is needed to avoid the damage of intelligent instrument and industrial control host. Figure 11 shows three common RS485 bus port protection schemes. The first is the scheme of three-level protection by connecting TVS devices in parallel with A,B port to the protective ground, TVS devices in parallel with A,B port, thermistor in series with A,B port, gas discharge tube in parallel to the protective ground; the second is the scheme of three-level protection by connecting TVS in parallel with A,B port to the ground, thermistor in series with A,B port, and varistor in parallel with A,B port; the third is the scheme of three-level protection by connecting AB with pull-up or pull-down resistor to power and ground respectively, connecting TVS between A & B, A or B port connecting thermistor.

Pin Configuration

Figure 1 SIT3088E Pin Configuration

PIN DESCRIPTION

PINSYMBOLDESCRIPTION
1ROReceiver Output. When /RE is low and if A - B≥-10mV, RO will be
high; if A - B≤-200mV, RO will be low.
2/REReceiver Output Enable. Drive /RE low to enable RO; RO is high
impedance when /RE is high. Drive /RE high and DE low to enter
low-power shutdown mode.
3DEDriver Output Enable. Drive DE high to enable driver outputs. These
outputs are high impedance when DE is low. Drive /RE high and DE
low to enter low-power shutdown mode.
4DIDriver Input. With DE high, a low on DI forces non-inverting output
low and inverting output high. Similarly, a high on DI forces
non-inverting output high and inverting output low.
5GNDGround.
6Anon-inverting Receiver Input and non-inverting Driver Output.
7BInverting Receiver Input and Inverting Driver Output
8VCCPositive Supply.

Electrical Characteristics

PARAMETERSYMBOLCONDITIONMIN.TYP.MAX.UNIT
Differential Driver
Output (No load)		VOD135.5V
Differential DriverFigure 2, RL = 54 Ω,
VCC=3.3V		1.5VCC
OutputVOD2Figure 2, RL = 54 Ω,
VCC=5V		VCCV
Change in Magnitude of
Driver Differential
Output Voltage
(NOTE1)		∆VODFigure 2, RL = 54 Ω0.2V
Driver Common-Mode
Output Voltage		VOCFigure 2, RL = 54 Ω3V
Change in Magnitude of
Common-Mode Output
Voltage (NOTE1)		∆VOCFigure 2, RL = 54 Ω0.2V
Input High VoltageVIHDE, DI, /RE2.0V
Input Low VoltageVILDE, DI, /RE0.8V
Logic Input CurrentIIN1DE, DI, /RE-22μA
Output Short-circuit
Current, Short-circuit to
High		IOSD1short-circuit to
0V~12V		250mA
Output Short-circuit
Current, Short-circuit to
Low		IOSD2short-circuit to
-7V~0V		-250mA

NOTE1: ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.

Related Variants

The following components are covered by the same datasheet.

Part NumberManufacturerPackage
SIT3088EEPA——
SIT3088EESA——
SIT3088EEUA——
SIT3088ETKDFN-8-EP(3x3)
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