Interface Technology IO110VXI 128-Channel CMOS Digital I/O Module

The Interface Technology IO110VXI is a 128-channel CMOS digital I/O module designed for high-density signal interfacing in industrial and automation applications. It delivers simultaneous read/write capability across all 128 channels, software-configurable I/O groups, and multiple logic format support including CMOS, TTL, TTL Open Collector, Differential TTL, and Switched HV outputs. The module integrates on-board processing, external handshaking, and VXI TTLTRG synchronization for multi-module operation. ## Technical Specifications • Channels: 128 I/O channels per module • Channel Configuration: Groups of 8 channels software-configurable as input or output • Logic Formats: CMOS, TTL, TTL Open Collector, Differential TTL, Switched HV outputs • Data Fields: User-defined 1 to 32 bits wide; multiple fields supported • Simultaneous Operations: Full 128-bit latched reads and double-latched writes ensure all output channels transition simultaneously • Handshaking: External I/O handshaking with 4 strobes per connector; memory-backed pins for timing control • Control Lines: 4 tri-state control/output enable inputs per connector • Connectors: Four 50-pin IDC connectors on front panel • Termination: User-configurable I/O termination • Isolation: Optical, 3750 V ## Electrical Characteristics • Input Voltage: Vih 2.2 V min, Vil 0.8 V max • Output Current (Standard): −40 mA to +40 mA • Output Current (Open-Collector): −128 mA • Carry Current: 120 mA • Differential TTL: Vol 0.50 V, Voh 2.5 V, Iol 20 mA, Ioh −20 mA max, skew 21 ns max per card (50 ns added across multiple cards), rise/fall time 14 ns typical • Switched HV: Up to 100 V; sourced from user supply or backplane options (+5, ±12, ±24 V) ## Key Features • Tri-state output control for bus emulation • VXI TTLTRG synchronization for linked multi-module operation • On-board processor for autonomous operation • Simultaneous reads and writes on any field size or count ## Typical Applications Industrial automation, digital signal acquisition, multi-channel control systems, and real-time data capture requiring high channel density and deterministic timing. ## Compatibility & Integration Part of the IO50–IO130 family. Operates within VXI systems utilizing TTLTRG for cross-module triggering.