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USB-CTR04 User's Guide Specifications

External trigger

Table 4. Digital trigger specifications

Parameter Specification

Trigger source

External digital; TRIG terminal

Trigger mode

Software-selectable for edge or level sensitive, rising or falling edge, high or low

level.

Trigger latency

100 ns max

Trigger pulse width

100 ns min

Input type

Schmitt trigger, 47 kΩ pull-down to ground with 33 Ω in series

Schmitt trigger hysteresis

0.76 V typ

0.4 V min

1.2 V max

Input high voltage threshold 1.74 V typ

1.3 V min

2.2 V max

Input high voltage limit

5.5 V absolute max

Input low voltage threshold

0.98 V typ

0.6 V min

1.5 V max

Input low voltage limit

–0.5 V absolute min

0 V recommended min

External clock input/output

Table 5. External clock input/output specifications

Parameter Specification

Terminal names

CLKI, CLKO

Terminal type

CLKI: Input, active on rising edge

CLKO: Output, power on default is 0V, active on rising edge

Input clock frequency 4 MHz, max

Input clock pulse width

10.417 ns min

Input type

Schmitt trigger, 47 kΩ pull-down to ground with 33 Ω in series

Input Schmitt trigger hysteresis

0.76 V typ

0.4 V min

1.2 V max

Input high voltage threshold

1.74 V typ

1.3 V min

2.2 V max

Input high voltage limit

5.5 V absolute max

Input low voltage threshold

0.98 V typ

0.6 V min

1.5 V max

Input low voltage limit

–0.5 V absolute min

0 V recommended min

Output clock frequency

4 MHz, max

Output clock pulse width 10.417 ns

Output high voltage

4.4 V min (IOH = –50 µA)

3.78V min (IOH = –24 mA)

Output low voltage

0.1 V max (IOL = 50 µA)

0.44 V max (IOL = 24 mA)

Output current

24 mA max per pin, constrained to 240 mA across all output pins (counter outputs,

timer outputs, digital outputs, pacer clock output, and +VO)

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

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