UM202EESE Datasheet, PDF (4/11 Pages) Union Semiconductor, Inc. – High ESD-Protected, Fail-Safe, Single Supply RS-232 Transceivers

Pin Configurations
UM202EExE
SOP16/DIP16/TSSOP16
Pin Descriptions
Pin No.
SOP/DIP/TSSOP
1,3
2
4,5
6
7,14
8,13
9,12
10,11
15
16
Pin Name
C1₊, C1-
V₊
C2₊, C2-
V-
T_OUT
R_IN
R_OUT
T_IN
GND
V_CC
Function
Terminals for positive charge pump capacitor
+2V_CC voltage generated by the charge pump
Terminals for negative charge pump capacitor
-2V_CC voltage generated by the charge pump
RS-232 Driver Outputs
RS-232 Receiver Inputs
RS-232 Receiver Outputs
RS-232 Driver Inputs
Ground
+4.5V to +5.5V Supply Voltage Input
Detailed Description
The UM202EExE consists of three sections: charge-pump voltage converters, drivers, and
receivers. These E versions provide extra protection against ESD. They survive ±15kV discharges
to the RS-232 inputs and outputs, tested using the Human Body Model. When tested according to
IEC61000-4-2, they survive ±8kV contact-discharges and ±15kV air-gap discharges. The rugged
E versions are intended for use in harsh environments or applications where the RS-232
connection is frequently changed. The UM202EExE devices have internal charge pump voltage
converters which allow them to operate from a single +5V supply. The charge pumps will operate
with polarized or non-polarized capacitors ranging from 0.1 to 10μF and will generate the ±9V
needed to generate the RS-232 output levels.
RS-232 Drivers
The drivers are inverting transmitters, which accept TTL or CMOS inputs and output RS-232
signals with an inverted sense relative to the input logic levels. Typically the RS-232 output
voltage swing is ±9V. Even under worst case loading conditions of 3kΩ and 2500pF, the output is
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http://www.union-ic.com Rev.04 Jan.2013
4/11