ADLINK USB-1903 - Manual (Page 17)

Introduction 3
USB-1900 Series
1.4 Specifications
1.4.1 General Specifications
I/O Specifications
Number of channels 8-CH programmable function digital input (DI)
4-CH programmable function digital output
(DO)
Compatibility TTL (single-end) (supports 3.3V and 5 V DI but
3.3V DO)
Input voltage Logic low: VIL = 0.8 V max; IIL = 0.2 mA
max.Logic high: VIH = 2.0 V min.; IIH = 0.2 mA
max.
Output voltage Logic low: VOL = 0.5 V max; IOL = 10 mA max.
Logic high: VOH = 2.6V min.; IIH = 10 mA max.
Supporting modes (only one
can be selected and function
at the same time, please see
Section 4.6: Programmable
Function I/O) 8-CH TTL DI and 4-CH TTL DO
2-CH 32-bit general-purpose timer/counters:
Clock source: internal or external
Max source frequency: internal: 80 MHz;
external: 10 MHz
2-CH PWM outputs”:
Duty cycle:1-99% (please see
Section 4.8.10: Mode 10: PWM Output)
Modulation frequency: 20 MHz to 0.005Hz
Data transfers Programmed I/O
Physical, Power, and Operating Environment
Interface
High speed USB 2.0 compatible, mini-USB
connector
Dimensions
156 (L) x 114 (W) x 41 (H) mm (6.14 X 4.49 X 1.61
in.)
I/O Connector Two 20-pin removable screw-down terminals
Power requirement USB power (5 V @ 400 mA)
Operating environment
Ambient temperature:
0 to 55 °C
Relative humidity:
10% to 90%, non-condensing
Storage environment
Ambient temperature:
-20 to 70 °C
Relative humidity:
5% to 95%, non-condensing