GENERAL DESCRIPTION
The AD7306 line driver/receiver is a 5 V monolithic product
which provides an interface between TTL signal levels and dual
standard EIA RS-232/RS-422 signal levels. The part contains
two RS-232 drivers, one RS-422 driver, one RS-232 receiver,
and one receiver path which can be configured either as RS-232
or as RS-422.
An internal charge pump voltage converter facilitates operation
from a single +5 V power supply. The internal charge pump
generates ±10 V levels allowing RS-232 output levels to be developed
without the need for external bipolar power supplies.
A highly efficient charge pump design allows operation using
non polarized, miniature 0.1 mF capacitors. This gives a considerable
saving in printed circuit board space over conventional
products which can use up to 10 mF capacitors. The charge
pump output voltages may also be used to power external circuitry
which requires dual supplies.
The RS-232 channels are suitable for communications rates up
to 100 kHz and the RS-422 channels are suitable for high speed
communications up to 5 MHz. The RS-422 transmitter complementary
outputs are closely matched and feature low timing
skew between the complementary outputs. This is often an essential
requirement to meet tight system timing specifications.
All inputs feature ESD protection, all driver outputs feature
high source and sink current capability and are internally protected
against short circuits on the outputs. An epitaxial layer is
used to guard against latch-up.
The part is available in a 24-lead SOIC and 24-pin plastic DIP package.

FEATURES
RS-232 and RS-422 on One Chip
Single +5 V Supply
0.1 mF Capacitors
Short Circuit Protection
Excellent Noise Immunity
Low Power BiCMOS Technology
High Speed, Low Skew RS-422 Operation
–408C to +858C Operations

APPLICATIONS
DTE-DCE Interface
Packet Switching
Local Area Networks
Data Concentration
Data Multiplexers
Integrated Services Digital Network (ISDN)