Measurement-computing USB-1616FS Manual do Utilizador descarregar pdf (Página 25)

USB-1616FS User's Guide Specifications

Digital input/output

Table 7. Digital I/O specifications

Digital type

CMOS

Number of I/O

8 (DIO0 through DIO7)

Configuration

Independently configured for input or output

Pull up/pull-down configuration

All pins pulled up to USB VBUS via 47 kΩ resistors (default). Positions are

available for pull-down to ground (GND). Hardware selectable via 0 Ω

resistors is available as a factory option.

Digital I/O transfer rate (software paced)

System dependent, 33 port reads to 1000 port reads/writes or single bit

reads/writes per second, typ

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 (IOH = –2.5 mA)

3.8 V min

Output low voltage (IOL = 2.5 mA)

0.7 V max

Power on and reset state

Input

External trigger

Table 8. External trigger specifications

Parameter

Conditions

Specification

Trigger source (Note 3)

External digital

TRIG_IN

Trigger mode

Software selectable

Edge Sensitive: user configurable for CMOS

compatible rising (default) or falling edge.

Trigger latency

10 µs max

Trigger pulse width

1 µs min

Input high voltage

4.0 V min, 5.5 V absolute max

Input low voltage

1.0 V max, –0.5 V min

Input leakage current

±1.0µA

Note 3: TRIG_IN is a Schmitt trigger input protected with a 1.5 k Ohm series resistor.

External clock input/output

Table 9. External clock I/O specifications

Parameter

Conditions

Specification

Pin name

SYNC

Pin type

Bidirectional

Software selectable direction

Output

Outputs internal A/D pacer clock.

Input

Receives A/D pacer clock from external source.

Rising edge sensitive.

Input clock rate

50 kHz, max

Clock pulse width

Input

1 µs min

Output

5 µs min

Input leakage current

±1.0 µA

Input high voltage

4.0 V min, 5.5 V absolute max

Input low voltage

1.0 V max, -0.5 V absolute min

Output high voltage (Note 4)

IOH = –2.5 mA

3.3 V min

No load

3.8 V min

Output low voltage (Note 4)

IOL = 2.5 mA

1.1 V max

No load

0.6 V max

Note 4: SYNC is a Schmitt trigger input and is over-current protected with a 200 Ω series resistor.

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