HD26C31 Datasheet, PDF (10/15 Pages) Hitachi Semiconductor – Quadruple Differential Line Drivers With 3 State Outputs

HD26C31
HD26C31 Line Driver Applications
The HD26C31 is a line driver that meets the EIA RS-422A conditions, and has been designed to supply a
high current for differential signals to a bus line. Its features are listed below.
• Operates on a single 5 V power supply.
• High output impedance when power is off
• Sink current and source current both 20 mA
• On-chip power up/down protection circuit
As shown by the logic diagram, the enable function is common to all four drivers, and either active-high or
active-low can be selected.
The output section consists of two output stages (the Y side and Z side), each of which has the same sink
current and source current capacity.
Connection of a termination resistance when the HD26C31 is used as a balanced differential type driver is
shown.
Output Characteristics ("H" Level)
5.0
Ta = 25°C
4.0
V_CC = 5.5 V
3.0
V_CC = 5.0 V
2.0
1.0
V_CC = 4.5 V
0
–20 –40 –60 –80 –100
Output Current I_OH (mA)
Figure 1 I_OH vs. V_OH Characteristics
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