Product details


Number of input channels 8 Operating voltage (Min) (V) 4.5 Operating voltage (Max) (V) 5.5 I/O voltage (Min) (V) -0.5 I/O voltage (Max) (V) 6 IO current (mA) 0.2 to 5.2 Operating temperature range (C) -40 to 125 Interface type SPI Features Over Temperature Diagnostics Overtemperature diagnostics Logic voltage (Min) (V) 2 Logic voltage (Max) (V) 0.8 open-in-new Find other Multi-switch detection interface (MSDI) ICs

Package | Pins | Size

HTSSOP (PWP) 28 43 mm² 4.4 x 9.7 open-in-new Find other Multi-switch detection interface (MSDI) ICs


  • Eight Digital Sensor Inputs
    • High Input Voltage up to 34 V
    • Selectable Debounce Filters From 0 ms to
      3 ms
    • Flexible Input Current-Limited – 0.2 mA to
      5.2 mA
    • Field Inputs Protected to 15-kV ESD
  • Single 5-V Supply
  • Output Drivers for External Status LEDs
  • Cascadable for More Inputs in Multiples of Eight
  • SPI-Compatible Interface
  • Overtemperature Indicator
    • Industrial PCs
    • Digital I/O Cards
    • High Channel Count Digital Input Modules
    • Decentralized I/O Modules

All other trademarks are the property of their respective owners

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The SN65HVS885 is an eight channel, digital-input serializer for high-channel density digital input modules in industrial and building automation. Operating from a 5-V supply the device accepts field input voltages of up to 34 V. In combination with galvanic isolators the device completes the interface between the high voltage signals on the field-side and the low-voltage signals on the controller side. Inputs signals are current limited and then validated by internal debounce filters.

With the addition of few external components, the input switching characteristic can be configured in accordance with IEC61131-2 for Type 1, 2 and 3 sensor switches.

Upon the application of load and clock signals, input data is latched in parallel into the shift register and afterwards clocked out serially.

Cascading of multiple devices is possible by connecting the serial output of the leading device with the serial input of the following device, enabling the design of high-channel count input modules. Multiple devices can be cascaded through a single serial port, reducing both the isolation channels and controller inputs required.

Input status can be visually indicated via constant current LED outputs. The current limit on the inputs is set by a single, external, precision resistor. An on-chip temperature sensor provides diagnostic information for graceful shutdown and system safety.

The SN65HVS885 is available in a 28-pin PWP PowerPAD package, allowing for efficient heat dissipation. The device is specified for operation at temperatures from –40°C to 125°C.

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Technical documentation

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Type Title Date
* Datasheet SN65HVS885 34-V Digital-Input Serializer for 5-V Systems datasheet (Rev. A) Oct. 19, 2015
Application note How to Design Isolated Comparators for ±48V, 110V and 240V DC and AC Detection (Rev. A) Mar. 14, 2018
Application note How To Simplify Isolated 24-V PLC Digital Input Module Designs (Rev. B) Mar. 14, 2018
Application note How to Improve Speed and Reliability of Isolated Digital Inputs in Motor Drives Dec. 16, 2017
User guide SN65HVS885EVM User's Guide Jan. 13, 2009

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The SN65HVS885EVM evaluation module (EVM) supports the rapid, parametric evaluation of the SN65HVS885 digital input serializer. It is intended to be used in conjunction with the SN65HVS885 datasheet, (SLAS638). Note this EVM is not intended for electromagnetic compatibility (EMC) tests.

  • Eight Inputs
    • High Input Voltage - up to 34 V
    • Selectable Debounce Filters - 0 ms to 3 ms
    • Flexible Input Current Limit - 0.2 mA to 5.2 mA
    • Field Pins Protected to 15-kV HBM ESD
  • Output Drivers for External Status LEDs
  • Cascadable in Multiples of Eight Inputs
  • SPI-Compatible Interface
  • Single 5V supply
  • (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide

Reference designs

8-Channel Digital Input Module for Programmable Logic Controllers (PLC)
TIDA-00017 This TI Design provides a complete 8-channel digital input module front-end reference design for Programmable Logic Controllers (PLCs). It is designed and fully tested to meet IEC61000-4 EMC and surge requirements for industrial automation systems thus reducing the time to market for customer. The (...)
document-generic Schematic document-generic User guide

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