Measurement-computing USB-1208LS Instrukcja Użytkownika Pobierz pdf (Strona 21)

USB-1208LS User's Guide Specifications

Digital input/output

Table 7. DIO specifications

Parameter

Specification

Digital type

82C55

Number of I/O

16 (Port A0 through A7, Port B0 through B7

Configuration

2 banks of 8

Pull up/pull-down configuration

All pins pulled up to Vs via 47 kΩ resistors (default). Positions

available for pull down to ground. Hardware selectable via zero ohm

resistors as a factory option.

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)

3.0 V min

Output low voltage (IOL = 2.5 mA)

0.4 V max

External trigger

Table 8. Trigger input specifications

Parameter

Conditions

Specification

Trigger source (Note 4)

External digital

TRIG_IN

Trigger mode

Software selectable

Level sensitive: user configurable for

TTL level high or low input.

Trigger latency

Burst

25 µs min, 50 µs max

Trigger pulse width

Burst

40 µs min

Input high voltage

3.0 V min, 15.0 V absolute max

Input low voltage

0.8 V max

Input leakage current

±1.0 µA

Note 4: TRIG_IN is protected with a 1.5KOhm series resistor.

Counter

Table 9. Counter specifications

Parameter

Specification

Counter type

Event counter

Number of channels

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

1 2 ... 16 17 18 19 20 21 22 23 24 25 26

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