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July 2025
779553-01
779553-01, 250 kHz, USB 2.0 Full-Speed, USB-8451 I²C/SPI Interface Device
Actual item may vary if no part number is provided on quote request.
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Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
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May 2025
Gregg Flecki**** Verified Buyer
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January 2025
Carol Zimme**** Verified Buyer
" Very responsive and helpful, competitive pricing. Good source! "
July 2025
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
National Instruments 779553-01 I²C/SPI Interface Device
The 779553-01 from National Instruments is a master interface that is part of the USB-8451 model family. It is made to work seamlessly with devices that are serial peripheral interface (SPI), System Management Bus (SMBus), and inter-integrated circuit (I²C) compatible. This portable solution makes it easier to interface with integrated circuits and consumer devices thanks to its plug-and-play USB connectivity.
With its ability to operate at up to 12 MHz for SPI and 250 kHz for I²C, the 779553-01 enables effective data transfer in a range of applications. It features eight general-purpose digital I/O lines that can be used for LED toggling or setting I²C device addresses, among other things. Because of these capabilities, it's a great option for engineers who want to place the interface closer to the I²C/SPI devices than PCI interfaces in order to limit the length of the I²C bus and minimize noise issues.
The 779553-01 OEM is a full-speed USB 2.0 device, providing robust connectivity options for both I²C and SPI protocols. It provides a great deal of flexibility for a range of control and monitoring activities because of its eight SPI chip selections and eight general-purpose digital I/O channels. Precise control over digital signals is possible because each of the eight single-ended digital lines (P0.<0..7>) can be independently configured as either static digital input (DI) or digital output (DO) lines. The DIO port can be made to function at 5 V by adding an external pull-up resistor to its default configuration, which allows it to function in a push-pull mode at 3.3 V.
Along with an input for MISO (SDI), the 779553-01's SPI interface comprises outputs for SPI chip select (CS <0..7>), MOSI (SDO), and clock (SCLK). An absolute voltage range of -0.5V to +5.8V with respect to ground is supported by the push-pull mode-driven SPI signals. A broad variety of SPI devices can be used with this interface because it supports an 8-bit transmission size.
Standard mode clock rates (32kHz to 100kHz) and fast mode clock rates (125kHz to 250kHz) are supported via the 779553-01's I²C interface, which has both SDA and SCL lines. It is incompatible with High-Speed Mode and Fast Mode Plus. Reliability and the avoidance of harm to connected devices are guaranteed by the open-drain driver type and power-on high impedance state.
| Model | 779553-01 |
|---|---|
| Model Name | USB-8451 |
| Part Type | I²C/SPI Interface Device |
| Maximum I2C Clock Rate | 250 kHz |
| Maximum SPI Clock Rate | 12 MHz |
| USB Standard | USB 2.0 Full-Speed |
| Digital I/O Lines | 8 (P0.<0..7>) |
| SPI Chip Selects | 8 |
| I²C Modes Supported | Standard (32-100 kHz), Fast (125-250 kHz) |
| Power Supply Output | +5 V and GND |
Associated part numbers for 779553-01:
779553-01 PDF Manuals
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