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USB-1208HS-4AO User's Guide Specifications

Counters

Table 9. Counter specifications

Parameter Specification

Counter terminal names CTR0, CTR1

Counter type Event counter

Number of channels 2

Input type Schmitt trigger, 33 Ω series resistor, 47 kΩ pull-down to ground

Schmitt trigger hysteresis 0.4 V to 1.2 V

Input high voltage 2.2 V min

5.5 V absolute max

Input low voltage 1.5 V max

–0.5 V absolute min

0 V recommended min

Resolution 32 bits

Maximum input frequency 20 MHz

Counter read/write rates

(software paced)

33 to 8000 reads/writes per second typ, system dependent

High pulse width 25 ns min

Low pulse width 25 ns min

Timer

Table 10. Timer specifications

Parameter Specification

Timer terminal name TMR

Timer type PWM output with count, period, delay, and pulse width registers

Output value Default state is idle low with pulses high, software-selectable output invert

Internal clock frequency 40 MHz

High pulse width 20 ns min

Low pulse width 20 ns min

Output high voltage 4.4 V min (IOH = –50 µA)

3.76 V 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 (refer to Power section for additional information)

Memory

Table 11. Memory specifications

Parameter Specification

Data FIFO 4 kS analog input/4 kS analog output

Non-volatile memory 32 KB (16 KB firmware storage, 16 KB calibration/user data)

1 2 ... 15 16 17 18 19 20 21 22 23 24 25

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