DS1228 Datasheet, PDF (1/1 Pages) Dallas Semiconductor – +5V Powered Dual RS-232 Transmitter/Receiver

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+ ₁
V+ 2
16 VCC
15 _GND
C1- 3
C2+ 4
C2- 5
V- 6
T2OUT 7
R2IN ₈
14 T1OUT _C1+
1
16 VCC
V+
13 R1IN
2
15 GND
C1-
3
14 ^T1OUT
12 R1OUT _C2+
4
13 R1IN
C2-
11 T1IN
V-
5
6
12 ^R1OUT
11 ^T1IN
10 ^T2IN T2OUT
7
10 T2IN
9 R2OUT ^R2IN
8
9 R2OUT
16–Pin DIP (300 MIL)
16–Pin SOIC (300 MIL)
PIN DESCRIPTION
C1+, 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
V_CC
GND
– +5 Volts
– Ground
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.
021792 1/1