Acromag / Xembedded / Xycom XVME-240 80-Channel TTL I/O Module

The Acromag/Xembedded/Xycom XVME-240 is an 80-channel TTL-level digital I/O module engineered for VMEbus systems. It delivers high-density I/O capability through 64 bidirectional channels organized in eight byte-wide ports, plus eight edge-selectable interrupt inputs and eight flag output lines. Each port configures independently for input or output operation via the port direction register, while interrupt lines support rising or falling edge triggering with maskable control.

Flag outputs function as external interrupt acknowledge signals or general-purpose control lines.

Technical Specifications

• Total I/O Channels: 80 TTL-level channels


• Bidirectional Ports: 8 byte-wide ports (64 channels total)


• Interrupt Inputs: 8 lines with edge-selectable triggering (rising/falling) and maskable interrupt mask register


• Flag Outputs: 8 lines configurable as interrupt acknowledge or control signals


• Form Factor: Double-high VMEbus module


• Physical Dimensions: 233.7 mm × 160.0 mm (9.2" × 6.3")


• Power Supply: +5 V at 2.7 A to 3.6 A depending on output state


• Operating Temperature: 0°C to 65°C (32°F to 149°F)


• Non-Operating Temperature: -40°C to 85°C (-40°F to 185°F)


• Operating Humidity: 20% to 80% RH, non-condensing


• Operating Altitude: Sea level to 10,000 ft (3,048 m)


• Vibration: 5 to 2,000 Hz, 0.015" peak-to-peak displacement; 1.0 g max.

Key Features

• Programmable port direction control for each byte-wide channel


• Individual edge selection on interrupt inputs (rising or falling)


• Maskable interrupt generation on VMEbus


• TTL input threshold: Vih 2.0 V min., Vil 0.8 V max.


• Channel output drive: 48 mA low-level max.; flag output drive: 24 mA low-level max.


• IEEE 1014 VMEbus compliance: A24/A16:D16/D08(EO) DTB Slave, Interrupter I(1)-I(7)

Typical Applications Multi-channel digital control and monitoring, sensor interface arrays, interrupt-driven event detection, distributed I/O expansion in industrial VMEbus chassis, and external device synchronization.

Compatibility & Integration Designed for VMEbus backplane insertion. Supports dynamic interrupt vector assignment (D08(O) dynamic). Operates within standard industrial temperature and humidity ranges with specified vibration immunity.