Keithley 7707 Multiplexer Digital Module

The Keithley 7707 Multiplexer Digital Module is a plug-in expansion card for Keithley Models 2700, 2701, and 2750 data acquisition systems. It combines 10 channels of differential multiplexer switching with 32 channels of digital I/O to enable complex automated test sequences, signal routing, and external device control. The module supports flexible channel configurations - 10 channels in 2-pole mode or 5 channels in 4-pole mode - and can operate as two independent multiplexer banks for parallel measurement paths.

Technical Specifications

• Configuration: 10 × 2-pole or 5 × 4-pole


• Maximum signal level: 300 VDC, 300 Vrms (425 V peak AC), 1 A switched, 60 W / 125 VA


• Contact resistance: < 1 Ω any path; 10⁵ operations at maximum signal; > 10⁸ no-load operations


• Contact potential: < 6 µV typical per pair


• Offset current: < 100 pA


• Insertion loss: < 0.1 dB below 1 MHz; < 3 dB below 2 MHz (50 Ω system)


• Crosstalk (10 MHz, 50 Ω load): 10⁹ Ω, 10⁹ Ω, < 100 pF


• Common-mode voltage: 300 VDC, 300 Vrms (425 V peak AC)


• Minimum signal level: 10 mV, 10 µA


• Actuation time: < 3 ms


• Relay type: Latching electromechanical Digital I/O Channels


• Count: 32 channels (four 8-bit ports)


• Capacity: 33 V, 100 mA per output


• Digital input thresholds: VIN(L) 2 V


• Digital output levels: VOUT(L) 2.4 V @ 1 mA


• Thermal protection: Channels 11–14 protected to 1 A up to 25 V


• Short-circuit protection on all outputs

Key Features

• Flexible multiplexer topology for differential measurements and switching control


• Low contact resistance and minimal contact potential for precision applications


• High isolation exceeding 10⁹ Ω ensures signal integrity across channels


• TTL-compatible digital I/O with short-circuit and thermal protection


• Latching relays reduce power consumption in idle states

Typical Applications

• Multi-channel signal acquisition and automated measurement routing


• Digital control of external instrumentation and switching matrices


• Temperature, voltage, and resistance measurements across distributed test points


• Parallel test sequences using independent multiplexer banks

Compatibility & Integration The 7707 module integrates directly with Keithley 2700, 2701, and 2750 mainframes via standard plug-in architecture, inheriting host system measurement accuracy and control functionality.