HD26C32A_04 Datasheet, PDF (7/13 Pages) Renesas Technology Corp – Quadruple Differential Line Drivers 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
2.0
1.2
0.4
0.0
–0.4
Input Current vs. Input Voltage
Ta = 25°C
=0V
V ^CC
= ^{5.5 V}
V ^CC
–1.2
–2.0
–15 9
–3 0 3
9
15
Input Voltage V_IN (V)
Figure 2 Input Voltage vs. Input Current Characteristics
Rev.2.00, Jul.16.2004, page 7 of 12