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USB-8451 Specifications

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    Last Modified: February 28, 2017

    This section lists specifications for the USB-8451.

    The following specifications are typical at 25 °C unless otherwise noted.

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    Note  

    Specifications are subject to change without notice.

    Digital I/O (DIO)

    Number of lines

    P0.<0..7>

    8

    Direction control

    Input or output, software selectable

    Output driver type

    Push-pull (active drive) or open-drain, software selectable

    Absolute voltage range

    -0.5 V to +5.8 V with respect to GND

    Power-on state

    Input (high impedance)

    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
    Open-drain Vcc1 Vcc1 V
    1 Vcc refers to the pull-up voltage you select.

    SPI Interface

    Signal

    SPI CS <0..7>

    Output

    SPI MOSI (SDO)

    Output

    SPI MISO (SDI)

    Input

    SPI CLK (SCLK)

    Output (12 MHz max)

    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

    Output driver type

    Push-pull (active drive)

    Absolute voltage range

    -0.5 V to +5.8 V with respect to GND

    Power-on state

    Input (high impedance)

    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

    I2C Interface

    Signals

    SDA

    Output/input

    SCL

    Output (250 kHz max)

    Supported clock rates

    I2C Standard Mode

    32 kHz, 40 kHz, 50 kHz, 64 kHz, 80 kHz, 100 kHz

    I2C Fast Mode

    125 kHz, 160 kHz, 200 kHz, 250 kHz

    Fast Mode Plus

    Not supported

    I2C High Speed Mode

    Not supported

    Output driver type

    Open-drain

    Absolute voltage range

    -0.5 V to +5.8 V with respect to GND

    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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    Note  

    This interface is compatible with both I2C and SMBus devices.

    Bus Interface

    USB specification

    Full-speed (12 Mb/s)

    Power Requirements

    USB

    4.10 VDC to 5.25 VDC

    80 mA typical, 500 mA max

    USB Suspend

    300 μA standby mode, 500 μA max

    Output Voltage Sources

    +5 V output

    Voltage

    4.10 V min, 5.25 V max

    Current

    230 mA max

    Physical Characteristics

    USB-8451

    Dimensions

    Without connectors

    6.35 cm × 8.51 cm × 2.31 cm (2.50 in. × 3.35 in. × 0.91 in.)

    With connectors

    8.18 cm × 8.51 cm × 2.31 cm (3.22 in. × 3.35 in. × 0.91 in.)

    I/O connectors

    USB series B receptacle, two 16-position (screw terminal) plug headers

    Screw-terminal wiring

    16 AWG to 28 AWG copper conductor wire with 10 mm (0.39 in.) of insulation stripped from the end

    Torque for screw terminals

    0.22 N • m to 0.25 N • m (2.0 lb • in. to 2.2 lb • in.)

    Weight

    84 g (3 oz)

    USB-8451 OEM

    Dimensions

    5.74 cm × 6.73 cm × 1.15 cm (2.26 in. × 2.65 in. × 0.45 in.)

    I/O connectors

    USB series B receptacle; 34-p IDC ribbon cable header

    Weight

    21 g (0.74 oz)

    Dimensional drawings

    Figure 1. USB-8451 OEM Dimensions (Top View)
    Figure 2. USB-8451 OEM Dimensions (Front and Rear Views)

    Overvoltage Protection

    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.

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    Caution  

    Do not use this module for connection to signals or for measurements within Measurement Categories II, III, or IV.

    Safety

    Safety Standards

    This product is designed to meet the requirements of the following standards of safety for information technology equipment:
    • IEC 61010-1, EN 61010-1
    • UL 61010-1, CSA 61010-1
    spd-note-note
    Note  

    For UL and other safety certifications, refer to the product label or the Online Product Certification section.

    Hazardous Locations

    The NI USB-845x modules are not certified for use in hazardous locations.

    Electromagnetic Compatibility

    USB-8451

    This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:

    • EN 61326 (IEC 61326): Class A emissions; Basic immunity
    • EN 55011 (CISPR 11): Group 1, Class A emissions
    • AS/NZS CISPR 11: Group 1, Class A emissions
    • FCC 47 CFR Part 15B: Class A emissions
    • ICES-001: Class A emissions

    USB-8451 OEM

    The USB-8451 OEM device is intended for use as part of a system. To ensure that your system meets the appropriate EMC standards, you must test the entire system.

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    Note  

    For EMC declarations and certifications, and additional information, refer to the Online Product Certification section.

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    Note  

    For EMC compliance, operate this product according to the documentation.

    CE Compliance

    USB-8451

    This product meets the essential requirements of applicable European Directives, as follows:

    • 2014/35/EU; Low-Voltage Directive (safety)
    • 2014/30/EU; Electromagnetic Compatibility Directive (EMC)

    USB-8451 OEM

    The USB-8451 OEM device is intended for use as part of a system. To ensure that your system meets the appropriate CE Compliance regulations, you must test the entire system.

    Online Product Certification

    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.

    Environmental

    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

    Environmental Management

    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.

    Waste Electrical and Electronic Equipment (WEEE)

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    EU Customers  

    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.

    电子信息产品污染控制管理办法（中国RoHS）

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    中国客户  

    National Instruments符合中国电子信息产品中限制使用某些有害物质指令(RoHS)。关于National Instruments中国RoHS合规性信息，请登录 ni.com/environment/rohs_china。(For information about China RoHS compliance, go to ni.com/environment/rohs_china.)

    371746E-01

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