Measurement-computing USB-1024HLS Instrukcja Użytkownika Pobierz pdf (Strona 18)

USB-1024HLS User's Guide Specifications

Counter section

Table 2. Counter specifications

Pin name (Note 4) CTR

Counter type Event counter

Number of channels 1

Input source CTR screw terminal

Input type TTL, rising edge triggered

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

Note 4: CTR is a Schmitt trigger input

Power

Table 3. Power specifications

Parameter Conditions Specification

Supply current (Note 5) No load 80mA typ, 135 mA max

Input power requirements (Note 6) 4.75 V min, 5.25 V max

USB +5 V power available

Measured at "USB +5 V" screw

terminals (pins 10, 14, and 30)

4.4 V min, 5.25 V max

USB +5 V power

output current (Note 7)

Connected to:

! Self-powered hub

! Externally-powered root port hub

[350 mA] – [total output source

current]

Hold current: 350 mA, typical

Trip current: 700 mA typical

Trip/recovery time: 100 mS, max

USB +5 V over-current protection Resettable fuse

On resistance: 1.3 Ohms max

Note 5:

Note 6:

Note 7:

This is the total (no load) current requirement for the USB-1024HLS.

Bus-powered hubs are allowed to provide downstream USB power as low as 4.4 V. Although your

USB-1024HLS will typically function at this 4.4 V minimum, guaranteed performance requires a

minimum power supply voltage of 4.75 V. All self-powered and root port hubs will meet this 4.75 V

minimum.

See available source/sink current level in the "Digital input/output" section.

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