The Keithley 7020 and 7020-D Digital I/O Interface Cards deliver high-density digital signal management for automated test systems. Each card provides 40 independent digital inputs and 40 independent digital outputs—80 bits total—in a compact, cost-effective form factor. The 7020 uses a 96-pin DIN connector, while the 7020-D features dual 50-pin D-sub connectors optimized for frequent industrial connections. Both variants support monitoring and control applications requiring extensive digital signal routing without additional interface logic.
## Technical Specifications
**Digital I/O Configuration**
• 40 independent digital inputs with 10 kΩ internal pull-up resistors (removable for external pull-up devices)
• 40 independent digital outputs as open-collector drivers
• Input logic: Positive True; Input Logic Low ≤ 0.8 V; Input Logic High ≥ 2 V
• Input Logic Low Current: –600 µA maximum @ 0 V
• Input Logic High Current: 50 µA maximum @ 5 V
• Maximum input voltage: 42 V peak (overvoltage protected)
**Output Characteristics**
• Open-collector drivers with internal 5.3 V pull-up or external supply to 25 V maximum
• Per-channel sink current: 65 mA maximum
• Per-bank (8-bit) sink current: 500 mA maximum
• Per-card sink current: 1 A maximum
• Collector-Emitter saturation voltage: <0.75 V @ 1 mA, <1 V @ 65 mA
• Output protection: <18 Ω series resistance, PTC circuit protector per channel, internal flyback diode per driver
• Capable of driving solenoids, relays, and small motors directly
**Environmental**
• Operating: 0° to 50° C, up to 35° C and <80% RH
• Storage: –25° to 65° C
## Key Features
• Selectable internal or external pull-up voltage via jumper configuration
• Per-channel current limiting and overvoltage protection
• Low saturation voltage enables efficient driving of inductive loads
• DIN and D-sub connector options for different mechanical integration needs
## Typical Applications
• Equipment control and device activation in production test environments
• Digital signal monitoring in multi-unit automated test systems
• Relay and solenoid switching without external driver circuits
## Compatibility & Integration
The 7020 integrates into test systems requiring modular digital I/O expansion. Connector type selection (DIN vs. D-sub) determines mechanical fit and cable management strategy.
