Dallas Semiconductor DS1228 Datasheet
DS1228
DS1228
+5V Powered Dual RS-232
Transmitter/Receiver
FEATURES
• Operates from a single 5V power supply
• Two drivers and two receivers
• Meets all EIA RS-232-C specifications
• On-board voltage doubler
• On-board voltage inverter
• + 30V input levels
• + 9V output levels with + 5V supply
• Low-power CMOS
• Pin-compatible with the MAX 232
• Optional 16-pin SOIC surface mount package
PIN ASSIGNMENT
C1+
V+
C1-
C2+
C2-
V-
T2OUT
R2IN
16–Pin DIP (300 MIL) 16–Pin SOIC (300 MIL)
16
1
2
3
4
5
6
7
8
VCC
15
GND
14
T1OUT
C1+
R1IN
R1OUT
T1IN
T2IN
R2OUT
V+
C1-
C2+
C2-
V-
T2OUT
R2IN
13
12
11
10
9
16
1
15
2
3
14
13
4
5
12
6
11
7
10
9
8
PIN DESCRIPTION
C1+, C1 – Capacitor 1 Connections
C2+, C2 – Capacitor 2 Connections
V+, V- – +
T1IN, T2IN – Transmitter In
T1OU T, T2OU T – Transmitter Out
R1IN, R2IN – Receiver In
R1OU T, R2OUT – Receiver Out
V
CC
GND – Ground
10 Volts
– +5 Volts
VCC
GND
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
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 generate +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 convert TTL/CMOS inputs into +
other two level translators are capable of operating with
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.
9V RS-232 outputs. The
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.
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