The Keysight E1459A is a C-size, single-slot VXI digital input module delivering 64 optically isolated input channels for high-speed data acquisition and interrupt-driven applications. Register-based architecture enables precise sensing of DC levels and edge transitions across voltage levels from 5 V to 48 Vdc, with input protection to 60 Vdc between terminals and 125 V rms or Vdc between channels. The module integrates programmable debounce timing, 64 maskable edge-selectable interrupts, and handshake logic for efficient parallel data transfers in complex VXI systems.
Technical Specifications
Input Channels and Protection
• 64 input channels, optically isolated
• Maximum input voltage: 60 Vdc (between high and low terminals), 125 V rms or Vdc (between channels or to chassis)
• Supported voltage levels: 5, 12, 24, and 48 Vdc
• Input thresholds: 1, 2.5, 7, or 14 Vdc (minimum); 4, 9.5, 17, or 31 Vdc (maximum)
• Current draw: 0.5, 1.3, 2.8, or 5.8 mA at nominal voltages
• On-board 5 V supply with 9.4 kΩ effective pull-up resistance for switch detection
Interrupt and Timing Control
• 64 maskable, edge-selectable interrupts
• Time-programmable debounce: 16 µs to 1074 s in binary increments
• Independent debounce periods for channel groups 1–32 and 33–64
Data Transfer
• TTL-compatible logic levels, 5 V maximum
• Typical 16-bit read time: 1 ms via register access
• Handshake lines per word with strobe-in, ready-for-data, and interrupt-out signals
• Strobe-in capability for parallel 32- or 64-bit transfers
Physical and Power
• VXI Device Type: Register-based, A16, slave only
• Connectors: P1/P2 (VXIbus)
• Removable screw-type terminal module; maximum wire size 16 AWG
• Power draw: +5 V @ 0.19 A, +12 V @ 0.10 A (typical)
– Key Features
• Full optical isolation across all 64 channels for noise immunity
• Flexible voltage sensing at 5, 12, 24, or 48 Vdc with configurable input thresholds
• Time-programmable debounce down to 16 µs for glitch-free edge detection
• Dual-group debounce control for independent timing optimization
• Low power consumption: 0.5–5.8 mA per channel at nominal voltages
– Typical Applications
• Industrial control signal acquisition and monitoring
• Interrupt-driven digital state sensing in automated test systems
• Multi-channel alarm and status signal capture
• Real-time edge detection with programmable debounce filtering
– Compatibility & Integration
Designed for VXIbus systems as a register-based slave device operating in A16 address space. Integrates via standard P1/P2 VXIbus connectors with minimal power overhead.
