Signal output circuit, parallel interface circuit and printer ap

Details Signal output circuit, parallel interface circuit and printer ap Signal output circuit, parallel interface circuit and printer ap

1998-01-13

2000-07-11

Callahan, Timothy F.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327321, 327387, H03K 508

Patent

active

060878789

ABSTRACT:
An interface in accordance with IEEE 1284 has a signal output stage which is a totem pole circuit. The totem pole circuit may be damaged if its output signal line is left grounded for an extended period of time or if outputs are being delivered at both ends of the signal line. Drive by the totem pole circuit is limited to a case where a signal to be output is at a low level and to a length of time equivalent to, say, one clock period from the moment the signal makes a transition from the low to a high level. A high impedance is established at all other times during which the high level is in effect, with the high level being maintained by a pull-up resistor connected to the output signal line. As a result, the totem pole circuit will not be damaged even if the output line is grounded while at the high level.

REFERENCES:
patent: 5179558 (1993-01-01), Thacker
patent: 5214330 (1993-05-01), Okazaki
patent: 5526161 (1996-06-01), Suzuki et al.
patent: 5598150 (1997-01-01), Suzuki et al.
patent: 5646553 (1997-07-01), Mitchell

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