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Title:
DIGITAL OUTPUT CIRCUIT
Document Type and Number:
Japanese Patent JPH0832430
Kind Code:
A
Abstract:

PURPOSE: To eliminate a cause to malfunction by reducing waveform distortion when a level of an output terminal is driven to be low from a high level without much loss of a substantial function of the digital output circuit.

CONSTITUTION: The circuit is provided with an output section 2 using bipolar transistors(TRs) Q1, Q2 to apply pull-down drive to an output terminal 1 toward a reference potential side so as to apply pull-down drive to the output terminal 1 with a MOS TR in on/off drive in the same phase with the bipolar TRs Q1, Q2 in a slightly faster timing than that of the bipolar TRs Q1, Q2 toward the reference potential in an auxiliary way. Thus, a current drawing capability is stepwise increased when a level of the output terminal 1 is being descended from a high level to a low level to relax the transient phenomenon at the start of current drawing.


Inventors:
AOKI AKIO
Application Number:
JP16156294A
Publication Date:
February 02, 1996
Filing Date:
July 13, 1994
Export Citation:
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Assignee:
HITACHI LTD
HITACHI MICROCOMPUTER SYST
International Classes:
H03K17/16; H03K17/567; H03K17/615; H03K19/0175; (IPC1-7): H03K17/567; H03K17/16; H03K17/615; H03K19/0175
Attorney, Agent or Firm:
Tomio Ohinata



 
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