HD26C32A

Rev.2.00, Jul.16.2004, page 7 of 12

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

5.0

4.0

3.0

2.0

1.0

0.0

–80

–40

0

40

80

Ta = 25°C

Figure 1 Differential Input Voltage vs. Output Voltage Characteristics

Input Current vs. Input Voltage

2.0

–2.0

–15

9

0

3

15

–39

1.2

0.4

0.0

–0.4

–1.2

C

=

0

V

C

=

5.5

V

Ta = 25°C

Figure 2 Input Voltage vs. Input Current Characteristics