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44474A 16-Bit Digital Input/Output Module

Product Status: Discontinued | Currently Supported
This product is no longer available

A replacement for this product is available:

Key Features & Specifications

  • 125mA, up to 30V TTL
  • 16-bit bidirectional data lines
  • Plus 4 lines for control and handshaking
  • Address 16 I/O lines individually, as to independent 8-bit words, or as one 16-bit word
  • Screw terminal included


The Keysight 44474A Digital I/O module provides 16 bi-directional data lines (bits) plus 4 lines used for control and handshaking. The 16 data lines offer TTL compatible input and open collector output. The 16 I/O lines or bits can be addressed individually (bit-by-bit), as two independent 8-bit ports, or as one 16-bit word. For instance, one port can be used for output operation, while the other for input. Each I/O line can sink current up to 0.125A from external devices.

Standard Product Includes

  • 44474A 16-Bit Digital I/O Module
  • 1 Connection Terminal
  • 1 Certificate of Verification