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Specifications, Power requirements, Ttl inputs and outputs – National Instruments Interface Device NI PCI-8254R User Manual

Page 11: Ttl inputs, Ttl outputs

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11

NI PCI-8254R Quick Start Guide

Specifications

These specifications are typical at 25 °C, unless otherwise stated.

Power Requirements

IEEE 1394 bus power

1

........................... 18 W, maximum

(shared by both ports)

Isolated supply

2

...................................... 5 to 30 VDC

Camera interface .................................... IEEE 1394a

TTL Inputs and Outputs

Digital logic levels

TTL Inputs

Number of channels ............................... 2

Maximum pulse rate............................... 2 MHz

Minimum pulse detected ........................ 500 ns

Power-on state........................................ Input (high-impedance)

61.9 k

Ω pull-up to 5V

TTL Outputs

Number of channels ............................... 10

Output voltage range .............................. 0 V to 5 V

1

The bus power specification assumes that power is provided to the NI 8254R device from the host computer power supply via

the ATX power connector. If power is not supplied through this connector, camera power is supplied by the PCI bus and should
be limited to 5 W, shared by both ports.

2

Do not draw more than 500 mA combined from the V

iso

pins on the 44-pin D-SUB connector. Do not draw more than 100 mA

from 30 V isolated outputs. Do not draw more than 50 mA from 5 V isolated outputs.

Level

Minimum

Maximum

Input low voltage (V

IL

)

0 V

0.5 V

Input high voltage (V

IH

)

2.2 V

5 V

Output low voltage (V

OL

), at 5 mA

0.4 V

Output high voltage (V

OH

), at 5 mA

2.4 V