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PDF UM232E Data sheet ( Hoja de datos )

Número de pieza UM232E
Descripción (UM202E / UM232E) Single Supply RS-232 Transceivers
Fabricantes Union Microsystems 
Logotipo Union Microsystems Logotipo



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Union Microsystems, Inc.
UM202E/232E
High ESD-Protected,Fail-Safe, Single Supply RS-
232 Transceivers
General Description
The UM202E/232E series are low power single supply RS232 interface. The device consists of two line
drivers, two line receivers, and a 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. Chip power supply current is specified at 6.0 mA maximum, making the device ideal for
battery and power conscious applications.
The device operates at data signaling rates over 120 Kb/s. 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.
UM202E/232E comes in 16 pin DIP, SOP and SSOP 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 IEC1000-4-2 Air Discharge Method, without latchup. These devices are pin-to-pin compatible with
MAX202/232 devices as well as other popular industry standards.
Applications
Notebook, Subnotebook
Palmtop Computers
Battery-Powered Equipment
Hand-Held Equipment
POS terminal
Network Communication Equipment
Features
ESD Protection for RS-232 Bus Pins up to +/- 15kV Human Body Model
Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU V.28 Standards
Single +5V power supply
Low power, ICC 6.0 mA maximum
Operates up to 120 Kbit/s
BiCMOS Technology
Receiver Noise Filter
Latch-Up Performance Exceeds 200 mA
Pin compatible with industry standard MAX232, ICL232
UM202/232 Datasheet Rev. 0.1 , July 2005
Page 1 of 6
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UM232E pdf
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Union Microsystems, Inc.
Detailed Description
The UM202/232 consist of three sections: charge-pump voltage converters, drivers, and receivers. These
E versions provide extra protection against ESD. They survive ¡ À 1 5 k V discharges to the RS-232 inputs
and outputs, tested using the Human Body Model. When tested according to IEC1000-4-2, they survive
¡ À 8 k V contact-discharges and ¡ À 1 5 k V 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 UM202E/
232E 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 10 micro F and will generate the ¡ À 6 V needed to generate the RS-232 output levels.
Capacitor Selection
The capacitor type used for C1-C4 is not critical for proper operation. The UM202 requires 0.1 micron F
capacitors, although capacitors up to 10 micron F can be used without harm. Ceramic dielectrics are
suggested for the 0.1micron F capacitors. When using the minimum recommended capacitor values, make
sure the capacitance value does not degrade excessively as the operating temperature varies. If in doubt,
use capacitors with a larger (e.g., 2X ) nominal value. The effective series resistance (ESR) of capacitors,
which usually rises at low temperatures, influences the amount of ripple on V+ and V-. Use larger capaci-
tors (up to 10 X ) to reduce the output impedance at V+ and V-. Bypass VCC to ground with at least 0.1
micron F. In applications sensitive to power-supply noise generated by the charge pumps, decouple VCC
to ground with a capacitor the same size as (or larger than) the charge-pump capacitors (C1-C4).
RS-232 Drivers
The drivers are inverting transmitters, which accept TTL or CMOS inputs and output the RS-232
signals with an inverted sense relative to the input logic levels. Typically the RS-232output voltage
swing is 6V. Even under worst case loading conditions of 3kOhms and 2500pF, the output is
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 standards [EIA RS-232-D 2.1.7, Paragraph (5)]. However, the transition region slew rate
of these enhanced products is typically 10V/µs. The smooth transition of the loaded output from VOL
to VOH clearly meets the monotonicity requirements of the standard [EIA RS-232-D 2.1.7,
Paragraphs (1) & (2)].
RS-232 Receivers
The receivers convert RS-232 input signals to inverted TTL signals. Since the input is usually from a
transmission line, where long cable lengths and system interference can degrade the signal, the inputs
have a typical hysteresis margin of 500mV.This ensures that the receiver is virtually immune to noisy
transmission lines. 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 voltages up to 25V. Should an
input be left unconnected, a 5KOhm pull down resistor to ground will commit the output of the
receiver to a high state. In actual system applications, it is quite possible for signals to be applied to
the receiver inputs before power is applied to 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.
UM202/232 Datasheet Rev. 0.1 , July 2005
Page 5 of 6
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