HD26C32A Datasheet, PDF (9/14 Pages) Hitachi Semiconductor – Quadruple Differential Line Receivers With 3 State Outputs

HD26C32A
HD26C32A Line Receiver Applications
The HD26C32A is a line receiver that meets the EIA RS-422A and RS-423A conditions. It has a high in-
phase input voltage range, both positive and negative, enabling highly reliable transmission to be
performed even in noisy environments.
Its main features are listed below.
• Operates on a single 5 V power supply.
• ±0.2 V input sensitivity in in-phase input voltage ±7 V range
• Three-state output
• On-chip input fail-safe circuit
• 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 input can be selected.
When exchange is carried out using a party line system, it is better to keep the receiver input bias current
constituting the driver load small, as this allows more receivers to be connected.
Output Voltage vs. Differential Input Voltage
6.0
Ta = 25°C
5.0
V_CC = 5 V
4.0
V_CM = +7 V
V_CM = 0 V
3.0
V_CM = –7 V
2.0
1.0
0.0
–80 –40 0
40 80
Differential Input Voltage V_DIFF (mV)
Figure 1 Differential Input Voltage vs. Output Voltage Characteristics
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