The CA-IS398x family of isolated octal digital inputs are  optimized for industrial 24V digital input applications. All  devices can be configured for Type 1, Type 2, or Type 3  inputs with a few external components and each channel  can sink and source current. The isolation channels based  on Chipanalog’s advanced capacitive isolation technology feature up to 2.5kV_RMS isolation rating and ±300kV/μs  typical CMTI (low-speed channels), provide high  electromagnetic immunity, low propagation delay and low  jitter.

The CA-IS398x devices operate over the supply range of  2.25V to 5.5V on logic side, no power supply required on  field side. The logic output level is set by supply voltage  independently, easy to connect with 2.5V, 3.3V and 5V controller interface. The CA-IS3980S industrial interface  serializer translates, conditions and serializes the eight 24V  digital inputs to CMOS-compatible signals through the SPI  port required by microcontrollers; While the CA-IS398xP devices translate eight 24V industrial digital inputs to eight  CMOS-compatible parallel outputs. All devices provide  isolated digital outputs and all digital inputs can be currentsinking or current sourcing industrial inputs (bidirectional  inputs) from sensors and switches used in industrial,  process, and building automation. For robust operation in  industrial environments, each input of the CA-IS398x with  parallel outputs includes a glitch and debounce filters with  fixed delay time; The CA-IS3980S features programmable  debounce filters, allow flexible debouncing and filtering of  sensor outputs based on the application. Also, for systems  with more than eight sensor inputs, CA-IS3980S is capable  of daisy-chaining multiple devices and have up to 128 inputs  sharing the same isolated SPI interface. A simplified block  diagram for the CA-IS398x is shown in the figure below.