Measurement Computing

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USB Digital I/O

Output current (USB-DIO24/37)

Connected to self-powered hub: 460 mA max

Connected to bus-powered hub: 60 mA max. This is the total amount of current

that can be sourced from the USB +5V and digital outputs.

Over-current protection (USB-DIO24H/37); resettable fuse

Hold current: 350 mA, typ

Trip current: 700 mA typ

Trip/recovery time: 100 ms, max

On resistance: 1.3 Ω max

General

USB controller clock error:

25 °C: ±30 ppm max

0 °C to 70 °C: ±50 ppm max

Device type: USB 1.1 low-speed

Device compatibility: USB 1.1, USB 2.0

Environmental

Operating temperature range: 0 °C to 70 °C

Storage temperature range: –40 °C to 85 °C

Humidity: 0% to 90% non-condensing

Mechanical

Dimensions (L×W×H): 119 × 84 × 14 mm (4.68 × 3.31 × 0.55 in.)

USB cable length: 3 m (9.8 ft)

USB cable type: A-B cable, UL type AWM 2725 or equivalent.

Min 24 AWG VBUS/GND, min 28 AWG D+/D–

Specifications: USB-1024LS and

USB-1024HLS

Digital Input/Output

Digital type

USB-1024LS: 82C55

USB-1024HLS

Input: 74ACT373

Output: 74FCT244

Number of I/O: 24 (Port A Bit 0 through Port C Bit7)

Configuration: 2 banks of 8 and 2 banks of 4, or 3 banks of 8

Pull up/pull-down configuration:

All pins pulled up to 5V via 47 kΩ resistors (default). Selection available for pull

down to ground. Hardware selectable via zero Ω resistor.

Input high voltage: 2.0 V min, 5.5 V absolute max

Input low voltage: 0.8 V max, –0.5 V absolute min

Output high voltage

USB-1024LS (IOH = –2.5 mA): 3.0 V min

USB-1024HLS (IOH = –15 mA): 2.4 V min

Output low voltage

USB-1024LS (IOH = –2.5 mA): 0.4 V max

USB-1024HLS (IOH = 64 mA): 0.55 V max

Source current (USB-1024HLS)

Self-powered hub or externally powered root port hub: 15 mA per output,

max. Bus-powered or battery-powered root port hubs are not supported.

Sink current (USB-1024HLS):

365 mA/(number of outputs), max. 64 mA max sink current for any single

output. A low-side resettable fuse protects the USB-1024HLS. This is designed

to protect the host PC or hub from an over current condition. Assuming all

return currents in sinking applications return via the USB cable ground signal,

the maximum allowable return current is 500 mA. Include the USB-1024HLS

unloaded operating current (135 mA) in your power budget.

Power up / reset state: Input mode (high impedance)

Counter

Pin name: CTR; Schmitt trigger input.

Counter type: Event counter

Number of channels: 1

Input type: TTL, rising edge triggered

Input source: CTR screw terminal

Resolution: 32 bits

Schmidt trigger hysteresis: 20 mV to 100 mV

Input leakage current: ±1 µA

Maximum input frequency: 1 MHz

High pulse width: 500 ns min

Low pulse width: 500 ns min

Input low voltage: 0 V min, 1.0 V max

Input high voltage: 4.0 V min, 15.0 V max

Power

Supply current

USB-1024LS: 20 mA typ, 40 mA max. (Total current requirement; includes up

to 5 mA for the status LED.)

USB-1024HLS: 80 mA typ, 135 mA max. (Total current requirement; no load)

Input power requirements

USB-1024HLS: 4.75 V min, 5.25 V max.

Bus-powered hubs provide downstream USB power as low as 4.4 V. Guaranteed

performance requires a minimum supply voltage of 4.75 V. Self-powered and

root port hubs meet this minimum.

USB +5V power available

Connected to self-powered hub

USB-1024LS: 4.5 V min, 5.25 V max

USB-1024HLS: 4.4 V min, 5.25 V max

Self-powered refers to USB hubs and hosts with a power supply.

Connected to bus-powered hub

USB-1024LS: 4.1 V min, 5.25 V max

Bus-powered refers to USB hubs and hosts without their own power supply.

Output current

Connected to self-powered hub

USB-1024LS: 460 mA max

USB-1024HLS: (350 mA) – (total output source current)

Connected to bus-powered hub

USB-1024LS: 60 mA max. This is the total amount of current that can be

sourced from the USB +5V and digital outputs.

Over-current protection (USB-1024HLS); resettable fuse

Hold current: 350 mA, typ

Trip current: 700 mA typ

Trip/recovery time: 100 ms, max

On resistance: 1.3 Ω max

General

USB controller clock error:

25 °C: ±30 ppm max

0 °C to 70 °C: ±50 ppm max

Device type: USB 1.1 low-speed

Device compatibility: USB 1.1, USB 2.0

Environmental

Operating temperature range: 0 °C to 70 °C

Storage temperature range: –40 °C to 70 °C

Humidity: 0% to 90% non-condensing

Mechanical

Dimensions (L×W×H): 79 × 82 × 25 mm (3.11 × 3.23 × 0.98 in.)

USB cable length: 3 m (9.8 ft)

USB cable type: A-B cable, UL type AWM 2725 or equivalent.

Min 24 AWG VBUS/GND, min 28 AWG D+/D–

Specifications: USB-DIO96H and

USB-DIO96H/50

Digital Input/Output

Output: 74ABT244A

Input: 74ACT373;

USB-DIO96H hardware revision G and later: 74LCX24

Configuration: Eight banks of 8, eight banks of 4, programmable by bank as

input or output

Pull-up/down: High impedance pull-up/down selectable with DIP switch for

each digital input port.

Number of I/O: 96

Output high: 2.0 V min @ –24 mA

Output low: 0.5 V max @ 64 mA

Input high: 2.0 V min, 5.5 V max

Input low: 0.8 V max, –0.5 V absolute min

Input impedance: 47 kΩ (series resistance)

Source current: 24 mA per output max

Specifications