| Technical Specifications |
| Digital Input/Output |
| Digital type | Input: 74ACT373
Output: 74FCT244 |
| Number of I/O: | 24 (Port A Bit 0 through Port C Bit7) |
| Configuration: | 2 banks of 8 and 2 banks of 4, or 3 banks of 8 |
| Pull up/pull-down configuration: | All pins pulled up to 5V via 47 kO resistors (default). Selection available for pull down to ground. Hardware selectable via zero O resistor. |
| Input high voltage: | 2.0 V min, 5.5 V absolute max |
| Input low voltage: | 0.8 V max, –0.5 V absolute min |
| Source current | Self-powered hub or externally powered root port hub: 15 mA per output,max. Bus-powered or battery-powered root port hubs are not supported. |
| Sink current: | 365 mA/(number of outputs), max. 64 mA max sink current for any single output. |
| Counter |
| Pin name: | CTR; Schmitt trigger input. |
| Counter type: | Event counter |
| Number of channels: | 1 |
| Input type: | TTL, rising edge triggered |
| Input source: | CTR screw terminal |
| 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 |
| Power |
| Supply current | 80 mA typ, 135 mA max. (Total current requirement; no load) |
| Input power requirements | 4.75 V min, 5.25 V max. USB +5V power available |
| General |
| USB controller clock error: | 25 °C: ±30 ppm max 0 °C to 70 °C: ±50 ppm max |
| Device type: | USB 1.1 low-speed |
| Device compatibility: | USB 1.1, USB 2.0 |
| Environmental |
| Operating temperature range: | 0 °C to 70 °C |
| Storage temperature range: | –40 °C to 70 °C |
| Humidity: | 0% to 90% non-condensing |
| Mechanical |
| Dimensions (L×W×H): | 79 × 82 × 25 mm (3.11 × 3.23 × 0.98 in.) |
| USB cable length: | 3 m (9.8 ft) |
| USB cable type: | A-B cable, UL type AWM 2725 or equivalent. Min 24 AWG VBUS/GND, min 28 AWG D+/D– |
