This section lists specifications for the USB-8451.
The following specifications are typical at 25 °C unless otherwise noted.
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Direction control |
Input or output, software selectable |
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Output driver type |
Push-pull (active drive) or open-drain, software selectable |
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Absolute voltage range |
-0.5 V to +5.8 V with respect to GND |
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Power-on state |
Input (high impedance) |
Digital logic levels
Level | Min | Max | Units | |
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Input | ||||
Input low voltage | -0.3 | 0.8 | V | |
Input high voltage | 2.0 | 5.8 | V | |
Input leakage current | — | 50 | µA | |
Output | ||||
Output low voltage (I = 8.5 mA) | — | 0.8 | V | |
Output high voltage | ||||
Push-pull (active drive), I = -8.5 mA | 2.0 | 3.5 | V | |
Open-drain | Vcc1 | Vcc1 | V | |
1 Vcc refers to the pull-up voltage you select. |
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Supported clock rates |
48 kHz, 50 kHz, 60 kHz, 75 kHz, 80 kHz, 96 kHz, 100 kHz, 120 kHz, 125 kHz, 150 kHz, 160 kHz, 200 kHz, 240 kHz, 250 kHz, 300 kHz, 375 kHz, 400 kHz, 480 kHz, 500 kHz, 600 kHz, 750 kHz, 800 kHz, 1 MHz, 1.2 MHz, 1.5 MHz, 2 MHz, 2.4 MHz, 3 MHz, 4 MHz, 6 MHz, 12 MHz |
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Output driver type |
Push-pull (active drive) |
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Absolute voltage range |
-0.5 V to +5.8 V with respect to GND |
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Power-on state |
Input (high impedance) |
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Transfer size |
8 bits |
Digital logic levels
Level | Min | Max | Units | |
---|---|---|---|---|
Input | ||||
Input low voltage | -0.3 | 0.8 | V | |
Input high voltage | 2.0 | 5.8 | V | |
Input leakage current | — | 50 | µA | |
Output | ||||
Output low voltage (I = 8.5 mA) | — | 0.8 | V | |
Output high voltage | ||||
Push-pull (active drive), I = -8.5 mA | 2.0 | 3.5 | V |
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Output driver type |
Open-drain |
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Absolute voltage range |
-0.5 V to +5.8 V with respect to GND |
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Power-on state |
Input (high impedance) |
Digital logic levels
Level | Min | Max | Units | |
---|---|---|---|---|
Output | ||||
Output low voltage (I = 8.5 mA) | — | 0.8 | V | |
Output high voltage | ||||
Open-drain with external pull-up resistor | 2.0 | — | V |
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I/O connectors |
USB series B receptacle, two 16-position (screw terminal) plug headers |
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Screw-terminal wiring |
16 AWG to 28 AWG copper conductor wire with 10 mm (0.39 in.) of insulation stripped from the end |
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Torque for screw terminals |
0.22 N • m to 0.25 N • m (2.0 lb • in. to 2.2 lb • in.) |
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Weight |
84 g (3 oz) |
Connect only voltages that are within these limits.
Channel-to-COM (one channel) |
± 30 V max, Measurement Category I |
Channels-to-COM (one port, all channels) |
± 8.9 V max, Measurement Category I |
Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics.
For UL and other safety certifications, refer to the product label or the Online Product Certification section.
This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:
Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit ni.com/certification, search by model number or product line, and click the appropriate link in the Certification column.
The NI USB-845x modules are intended for indoor use only.
Operating temperature (IEC 60068-2-1 and IEC 60068-2-2) |
0 °C to 45 °C |
Operating humidity (IEC 60068-2-56) |
10% to 90% RH, noncondensing |
Maximum altitude |
2,000 m (at 25 °C ambient temperature) |
Storage temperature (IEC 60068-2-1 and IEC 60068-2-2) |
-40 °C to 85 °C |
Storage humidity (IEC 60068-2-56) |
5% to 90% RH, noncondensing |
Pollution Degree (IEC 60664) |
2 |
NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers.
For additional environmental information, refer to the Minimize Our Environmental Impact web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.
At the end of the product life cycle, all NI products must be disposed of according to local laws and regulations. For more information about how to recycle NI products in your region, visit ni.com/environment/weee.