鈥?/div>
Capacitor 1 Connections
Capacitor 2 Connections
+ 10 Volts
Transmitter In
Transmitter Out
Receiver In
Receiver Out
+5 Volts
Ground
T2IN T2OUT
R2OUT
R2IN
16鈥揚in DIP (300 MIL)
16鈥揚in SOIC (300 MIL)
DESCRIPTION
The DS1228 is a dual RS-232-C Receiver/Transmitter
that meets all EIA specifications while operating from a
single, +5 volt supply. The DS1228 has two internal
charge pumps. One of the charge pumps is used to gen-
erate +10 volts. The other is used to generate -10 volts.
The DS1228 also contains four level translators. Two of
the level translators are RS-232 transmitters which con-
vert TTL/CMOS inputs into +9V RS-232 outputs. The
other two level translators are capable of operating with
up to +30V inputs. The DS1228 is suitable for all RS-232
communications and is particularly valuable where
higher voltage power supplies for RS-232 drivers are
not available. The power supply section of the DS1228
supplies +10 volts from the V
CC
input.
See the DS1229 data sheet for electrical specifications
and operation.
ECopyright
1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor databooks.
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