The NI PCI-6541 is a 50 MHz digital waveform generator and analyzer delivering 32 single-ended digital I/O channels with independent per-channel direction control. Built on Synchronization and Memory Core (SMC) technology, it provides configurable onboard memory up to 64 Mbit per channel and supports advanced triggering, pattern sequencing, and complex waveform scripting. The device generates single or repeating waveforms with built-in PRBS and count patterns, while 4 PFI channels enable external synchronization and event signaling. Software-selectable logic levels (1.8 V, 2.5 V, 3.3 V, 5.0 V TTL) ensure compatibility across digital interfaces. With an internal VCXO clock and external clock input range of 20 kHz to 50 MHz, the PCI-6541 addresses digital communication, semiconductor testing, and custom interface development at high speed.
Technical Specifications
Waveform Generation & Memory
• Maximum sample clock frequency: 50 MHz
• Digital channels: 32 single-ended
• Onboard memory configurations: 1 Mbit/Channel, 8 Mbit/Channel, 64 Mbit/Channel
• Waveform quantum: Integer multiple of 2 samples
• Data delay resolution (≥25 MHz): 1/256 of sample clock period
Sample Clock
• Onboard clock: Internal VCXO with divider
• External clock input: 20 kHz to 50 MHz via SMB connector
• Strobe input duty cycle: 25% to 75% for clock frequencies <50 MHz
• Minimum detectable pulse width: 4 ns
Triggering & Synchronization
• Programmable Function Interface (PFI) channels: 4 with per-channel direction control
• Exported clock outputs: DDC CLK OUT and SMB CLK OUT
Electrical Characteristics
• Logic levels: 1.8 V, 2.5 V, 3.3 V, 5.0 V TTL (software-selectable)
• Input protection: −1 V to 6 V
• Input impedance: 10 kΩ
• Power supply: +3.3 VDC, +5 VDC, +12 VDC, −12 VDC
– Key Features
• Single, n-times, or continuous waveform generation modes
• Scripted mode for complex sequence control
• Built-in pattern generation: PRBS and count up/down
• 4 configurable PFI channels for external triggers and event outputs
– Typical Applications
• Digital communication system testing
• Semiconductor test and validation
• Custom digital interface development
• High-speed pattern generation and analysis
– Compatibility & Integration
The PCI form factor integrates directly into standard computer platforms. SMB and DDC connectors support industry-standard clock and control signals.
