Modular Systems > National Instruments > NI-654x Series
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PXI-6541, 32 Bidirectional Digital Channels, Digital Waveform Instrument
National Instruments PXI-6541 Digital Waveform Instrument
The National Instruments PXI-6541 (Part Numbers: 778952-01, 778952-02, 778952-03, 191151D-02L) is a 50 MHz Digital Waveform Generator/Analyzer designed for high-speed digital interfacing. This module features 32 bidirectional digital channels, per-channel direction control, and deep onboard memory with triggering and pattern sequencing capabilities. Through the NI-HSDIO driver, the user can configure the module to support 1.8V, 2.5V, 3.3V, and 5.0V TTL-compatible logic levels (previously stated as 5.0, 3.3, 2.5, or 1.8V logic in an incorrect order).
The NI PXI-6541 is compatible with the NI Digital Waveform Editor, an advanced software tool for creating and modifying digital waveforms. Using Synchronization and Memory Core (SMC) technology, this module enables integration into mixed-signal test systems alongside digitizers, arbitrary waveform generators, and other digital waveform generator/analyzers. The PXI-6541 allows for multi-device synchronization to build low-skew, multi-channel systems for testing high-pin-count digital ICs and hardware.
There are three memory variants of the PXI-6541, each identified by a unique part number:
PXI-6541 1 Mbit (Part Number: 778952-01)
PXI-6541 8 Mbit (Part Number: 778952-02)
PXI-6541 64 Mbit (Part Number: 778952-03)
The NI-HSDIO driver enables users to configure and control the PXI-6541 in multiple development environments while adhering to IVI API guidelines. National Instruments Measurement & Automation Explorer (MAX) is included with the driver, providing basic acquisition and generation test panels. (Clarified that MAX is included with the NI-HSDIO driver rather than explicitly on the CD, since modern software is usually downloaded.)
The PXI-6541 incorporates Synchronization and Memory Core (SMC) technology, where waveforms and instructions share onboard memory. Parameters such as the number of script instructions, waveform storage capacity, and sample count (S) are flexible and user-defined.
The PXI-6541 has been designated with Mature Status by National Instruments, but Apex Waves continues to offer sales and repair services for this model.
| Model | PXI-6541 |
|---|---|
| Manufacturer | National Instruments |
| Part Numbers | 778952-01, 778952-02, 778952-03, 191151D-02L |
| Series | NI-654x Series |
| Type | Digital Waveform Instrument |
| Synchronization | SMC-Based Synchronization with Other NI Waveform Instruments |
| Digital Channels | 32 |
| Maximum Clock Rate | 50 MHz |
| Onboard Memory Size | 1, 8, or 64 Mbit per channel |
| Supported Logic Levels | 1.8V, 2.5V, 3.3V TTL (5V TTL compatible) |
| Output Impedance | 50 Ω nominal |
| Input Impedance | 50 kΩ (for newer module assemblies), 10 kΩ (for older versions) |
Associated part numbers for PXI-6541:
National Instruments PXI-6541 Frequently Asked Questions
Question: How many digital pins does the PXI-6541 interface with?
Answer: The PXI-6541 interfaces with 32 single-ended digital pins.
Question: What is the maximum waveform rate that the NI PXI-6541 can sample?
Answer: The NI PXI-6541 operates with a maximum sample clock rate of 50 MHz, but the maximum digital toggle rate is 25 MHz per channel.
Question: What voltages are the PXI 6541 compatible with?
Answer: The PXI-6541 supports 1.8V, 2.5V, and 3.3V TTL logic levels, with 5V TTL compatibility for inputs.
| Accessory Type | Model Name | Part Number |
|---|---|---|
| Cable | SHC68-C68-D4 (Shielded Recommended) | 781013-01 (0.55 m) |
| 196275-01 (1 m) | ||
| 781293-01 (2 m) | ||
| 132625-03 (3 m) | ||
| C68-C68-D4 Cable (Unshielded) | 195949-01 | |
| SHC68-H1X38 (Shielded, Flying Lead) | 192681-1R5 | |
| Cable Adapter | 653x Cable Adapter | 195846-01 |
| Screw Terminal Block (Shielded) | SCB-68 HSDIO | 782914-01 |
| SCB-68A | 782536-01 | |
| Screw Terminal Block (Unshielded, DIN Rail Mount) | CB-2162 | 778592-01 |
| CB-68LP | 777145-01 | |
| CB-68LPR | 777145-02 | |
| Screw Terminal Block (Unshielded) | TBX-68 | 777141-01 |
| Breakout Box | SMB-2163 | 778747-01 |
| - | - | - |
*The device is compatible with SCSI accessories when using the 653x Cable Adapter. Without this adapter, VHDCI accessories must be used.
*The SCB-68 / SCB-68A must use Direct Feedthrough Mode for configuration.
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