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DS1228
+5V powered dual RS-232 transmitter/receiver
Copyright 1995 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding patents and other intellectual property rights, please refer to
Dallas Semiconductor databooks.
021792 1/1
FEATURESOperates from a single 5V power supplyTwo drivers and two receiversMeets all EIA RS-232-C specificationsOn-board voltage doublerOn-board voltage inverter+ 30V input levels+ 9V output levels with + 5V supplyLow-power CMOSPin-compatible with the MAX 232Optional 16-pin SOIC surface mount package
PIN ASSIGNMENT 16–Pin DIP (300 MIL)16–Pin SOIC (300 MIL)C1+
C1-
C2+
C2-
T2OUT
R2IN
VCC
GND
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
VCC
GND
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
C1+
C1-
C2+
C2-
T2OUT
R2IN
PIN DESCRIPTIONC1+, C1–Capacitor 1 Connections
C2+, C2–Capacitor 2 Connections
V+, V-–+ 10 Volts
T1IN, T2IN–Transmitter In
T1OUT, T2OUT–Transmitter Out
R1IN, R2IN–Receiver In
R1OUT, R2OUT–Receiver Out
VCC–+5 Volts
GND–Ground
DESCRIPTIONThe 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 VCC input.
See the DS1229 data sheet for electrical specifications
and operation.
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
