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74LVC1284 device highlight
The well known parallel printer interface protocol has been upgraded with the new IEEE 1284 standards.
The new protocol standards broaden the traditional applications of the parallel interface to include scanners, CD-ROM players, hard disks and feature rich bi-directional printers.
These more sophisticated protocols are also much faster - over two megabytes/second.
The
NXP 74LVC1284 parallel interface transceiver/buffer is an ideal component to implement an IEEE1284 compliant bi-directional electrical interface.
Typical Applications
A typical interface between a driver and receiver is shown in the figure above.
Zo = 50 ohms and Ro = Rs_90% Zo, but Rin >> Zo.
(Ro is the driver impedance as seen by the cable.
Zo is the input impedance of the cable.
Rd is the B/Y side output resistance, Rs is an added series resistance and Rin is the input impedance of the receiver.)
These impedance relationships cause half the source voltage to be injected into the cable which generates essentially double the voltage feeding the receiver due to reflection from the selected mismatch.
This causes the input voltage at the receiver to be close to the value of the source voltage.
A corresponding transceiver interface is shown in the figure below.
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74LVC1284
