UM202EExE
High ESD-Protected, Fail-Safe, Single Supply RS-232
Transceivers
UM202EESE SOP16
UM202EEPE DIP16
UM202EEUE TSSOP16
General Description
The UM202EExE series are low power single supply RS232 interface. The device consists of two
line drivers, two line receivers, and dual charge pump circuit. The device meets the requirements
of TIA/EIA-232 standard and provides the electrical interface between an asynchronous
communication controller and the serial-port connector. The on chip charge pump and four small
external capacitors act as onboard DC to DC converter, allow chip operated from single 5V
supply, eliminating the need for ±10V power supplies, reduce cost and board space. The device
operates at data signaling rates over 250Kbps. The slew rate of driver is set internally less than
30V/μs and the receivers feature internal noise filtering, eliminating the need for external slew
rate and filter capacitors for reliable operation. The driver inputs and receiver outputs are TTL and
CMOS compatible. UM202EExE comes in 16 pin DIP, SOP and TSSOP packages, operating over
the commercial and industrial temperature ranges.
The ESD tolerance has been upgraded on these devices to over ±15KV for both Human Body
Model and IEC61000-4-2 Air Discharge Method, without latch-up. The device operates with four
0.1μF capacitors, reduce system cost and board space.
Applications
Notebook and Palmtop Computers
Battery-Powered Equipment
Hand-Held Equipment
POS terminal
Features
ESD Protection for RS-232 Bus Pins up to ±15kV Human Body Model
Single +5V power supply
Low power, I
CC
15mA maximum
Operates up to 250Kbps
Receiver Noise Filter
Latch-Up Performance Exceeds 200mA
Ordering Information
Part Number
UM202EESE
UM202EEPE
UM202EEUE
Temp. Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Package Type
SOP16
DIP16
TSSOP16
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UM202EExE
Absolute Maximum Ratings (Note 1)
Symbol
V
CC
V
+
V
-
T_IN
R_IN
T_OUT
R_OUT
Parameter
Supply Voltage on V
CC
Voltage on V
+
Voltage on V
-
Voltage on T_IN
Voltage on R_IN
Voltage on T_OUT
Voltage on R_OUT
Short-Circuit Duration, T_OUT
P
D
T
A
T
STG
T
L
Continuous Power Dissipation
at T
A
= 70°C
SOP16
DIP16
TSSOP16
Value
-0.3 to +6
(V
CC
- 0.3) to +14
-14 to +0.3
-0.3 to (V
CC
+ 0.3)
±30
(V
-
- 0.3) to (V
+
+ 0.3)
-0.3 to (V
CC
+ 0.3)
Continuous
696
842
754.7
-40 to +85
-65 to +165
+300
mW
°C
°C
°C
Unit
V
V
V
V
V
V
V
Operating Temperature Range
Storage Temperature Range
Maximum Lead Temperature for Soldering
10 seconds
Note 1: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent
damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
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UM202EExE
Electrical Characteristics
(V
CC
=+5V±10%, C1- C4=0.1uF, T
A
=T
MIN
to T
MAX
, unless otherwise noted. Typical values are at
T
A
=25℃)
Parameter
Symbol
Conditions
Min
Typ
Max
DC CHARACTERISTICS
10
15
No load, T
A
= +25°C
V
CC
Supply Current
I
CC
LOGIC
±10
Input Leakage Current
T_IN = 0V to V
CC
Input Threshold Low
T_IN
0.8
V
IL
Input Threshold High
T_IN
2.0
V
IH
Output Voltage Low
V
OL
R_OUT; I
OUT
= 3.2mA
0.4
Output Voltage High
3.5
R_OUT; I
OUT
= -1.0mA
V
OH
V
CC
-0.4
Output Leakage
±0.05
±10
0V
≤
ROUT≤ V
CC
Current
EIA/TIA-232E RECEIVER INPUTS
Input Voltage Range
-30
30
Normal
T
A
= +25°C,
0.8
1.2
Input Threshold Low
operation
V
CC
= 5V
Normal
T
A
= +25°C,
1.7
2.4
Input Threshold High
operation
V
CC
= 5V
Input Hysteresis
V
CC
= 5V
0.2
0.5
1.0
Input Resistance
T
A
= +25°C, V
CC
= 5V
3
5
7
EIA/TIA-232E TRANSMITTER OUTPUTS
All drivers loaded with 3kΩ to
Output Voltage Swing
±5
±9
ground
V
CC
= V+ = V- = 0V,
300
Output Resistance
V
OUT
= ±2V
Output Short-Circuit
short to V
CC
, GND or other
±70
Current
TXD pin
TIMING CHARACTERISTICS
R
L
= 3kΩ to 7kΩ, C
L
= 50pF
Maximum Data Rate
250
to 1000pF, one transmitter
switching
All parts,
Receiver Propagation
t
PLHR
,
0.3
C
L
= 150pF
normal
Delay
t
PHLR
operation
Transmitter
t
PLHT
,
R
L
= 3kΩ, C
L
= 2500pF,
1.2
Propagation Delay
all transmitters loaded
t
PHLT
T
A
= +25°C, V
CC
= 5V,
R
L
= 3kΩ to 7kΩ, C
L
= 50pF
Transition-Region
20
30
to 1000pF, measured from -3V
Slew Rate
to +3V or +3V to -3V,
Figure 1
ESD PERFORMANCE
TRANSMITTER OUTPUTS, RECEIVER INPUTS
Human Body Model
±15
IEC61000-4-2,
ESD-Protection
±8
Contact Discharge
Voltage
IEC61000-4-2,
±15
Air-Gap Discharge
Unit
mA
μA
V
V
V
V
μA
V
V
V
V
kΩ
V
Ω
mA
kbps
μs
μs
V/μs
kV
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UM202EExE
Pin Configurations
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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UM202EExE
guaranteed to be ±5V, which is consistent with the RS-232 standard specifications. The
transmitter outputs are protected against infinite short-circuits to ground without degradation in
reliability. The instantaneous slew rate of the transmitter output is internally limited to a
maximum of 30V/μs in order to meet the RS-232 standard. The smooth transition of the loaded
output from V
OL
to V
OH
clearly meets the monotonicity requirements of the RS-232 standard.
RS-232 Receivers
The receivers convert RS-232 input signals to inverted TTL signals. The input thresholds are 0.8V
minimum and 2.4V maximum, again well within the 3V RS-232 requirements. The receiver
inputs are also protected against voltage up to 30V. A 5kΩ pull down resistor to ground will
commit the output of the receiver to a high state when the pin is float. In actual system
applications, it is quite possible for signals to be applied to the receiver inputs before power is
applied the receiver circuitry. This occurs, for example, when a PC user attempts to print, only to
realize the printer wasn’t turned on. In this case an RS-232 signal from the PC will appear on the
receiver input at the printer. When the printer power is turned on, the receiver will operate
normally. All of these enhanced devices are fully protected.
ESD Protection
UM202EExE devices have standard ESD protection structures incorporated on the pins to protect
against electrostatic discharges encountered during assembly and handling. In addition, the RS232
bus pins (driver outputs and receiver input) of these devices have an extra level of ESD protection.
Advanced ESD structures were designed to successfully protect these pins against ESD discharge
of ±15kV Human Body Model when powered down or up.
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