Specifications

Little Board/P5i Technical Manual
2–16
Table 2–11 J15 Mating Connector
Connector Type Mating Connector
RIBBON 3M 3399-7600
Latching Clip 3505-8026
DISCRETE WIRE MOLEX HOUSING 22-55-2262
PIN 16-02-0103
Note
For maximum reliability, keep the cable between the board and the
device it drives to 10 feet or less in length.
IEEE-1284-compliant Cables
Using the parallel port for high-speed data transfer in ECP/EPP modes requires special cabling for
maximum reliability.
Some of the parameters for a compliant IEEE-1284 cable assembly include:
• All signals are twisted pair with a signal and ground return
• Each signal and ground return should have a characteristic unbalanced impedance of 62 +/- 6 ohms
within a frequency band of 4 to 16 MHz
• The wire-to-wire crosstalk should be no greater than 10%
Please refer to the IEEE-1284 standard for the complete list of requirements for a compliant cable
assembly, including recommended connectors
Latch Up Protection
The parallel port incorporates chip protection circuitry on some inputs, designed to minimize the
possibility of CMOS “latch up” due to a printer or other peripheral being powered up while the Little
Board/P5i is turned off.