© National Instruments Corporation
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
—
