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What is SP202E?

This electronic component, produced by the manufacturer "Exar", performs the same function as "High Performance RS-232 Line Drivers/Receivers".


SP202E Datasheet PDF - Exar

Part Number SP202E
Description High Performance RS-232 Line Drivers/Receivers
Manufacturers Exar 
Logo Exar Logo 


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SP202E,SP232E, SP233E, SP310E and SP312E
High Performance RS-232 Line Drivers/Receivers
FEATURES
• Operates from a Single +5V Power Supply
• Meets all RS-232D and ITU V.28 Specifications
• Operates with 0.1μF to 10μF Ceramic Capacitors
• No External Capacitors required (SP233E)
• Low Power Shutdown (SP310E, SP312E)
• High Data Rate - 120kbps under load
• Low power CMOS Operation
• Lead Free packaging available
• Improved ESD Specifications:
+/-15kV Human Body Model
DESCRIPTION
The SP202E, SP232E, SP233E, SP310E and SP312E devices are a family of line driver and re-
ceiver pairs that meets the specifications of RS-232 and V.28 serial protocols. The devices are pin-
to-pin compatible with Exar's SP232A, SP233A, SP310A and SP312A devices as well as popular
industry standard pinouts. The ESD tolerance has been improved on these devices to over +/-15kV
for Human Body Model. This series offer a 120kbps data rate under load, small ceramic type 0.1μF
charge pump capacitors and overall ruggedness for comercial applications. Features include Exar's
BiCMOS design which allowing low power operation without sacrificing performance. The series is
available in lead free packages with commercial and industrial temperature ranges.
Model
SP202E
SP232E
SP233E
SP310E
SP312E
Number of RS-232 No. of RX
Drivers
Receivers
active in
Shutdown
22
0
22
0
22
0
22
0
22
2
No. of External
0.1μF Capacitors Shutdown
4 No
4 No
0 No
4 Yes
4 Yes
SELECTION TABLE
WakeUp TTL Tri-State
No No
No No
No No
No Yes
Yes Yes
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311


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SP202E equivalent
DETAILED DESCRIPTION
The SP202E, SP232E, SP233E, SP310E and
SP312A devices are a family of line driver and
receiver pairs that meet the EIA/TIA-232 and
V.28 serial communication protocols. The ESD
tolerance has been improved on these devices
to over +/-15kV for Human Body Model. These
devices are pin-to-pin compatible with Exar's
232A, 233A, 310A and 312A as well as popular
industry standards. This family of parts offer a
120kbps data rate, 10V/μs slew rate and an on-
board charge pump that operates from a single
5V supply using 0.1μF ceramic capacitors.
Receivers
DESCRIPTION
The receivers convert EIA/TIA-232 signal lev-
els to inverted TTL or CMOS logic output lev-
els. Since the input is usually from a transmis-
sion line, where long cable length 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 2.8V maximum, again
well within the +/-3V RS-232 requirements.
Should an input be left unconnected, an internal
5kohm pull-down resistor to ground will commit
the output of the receiver to a HIGH state.
The SP202E, 232E, 233E, 310E and 312E de-
vices have internal charge pump voltage con-
verters which allow them to operate from a sin-
gle +5V supply. The charge pumps will operate
with polarized or non-polarized capacitors rang-
ing from 0.1 to 10µF and will generate the +/-6V
needed to generate the RS-232 output levels.
The SP233E design offers internal charge pump
capacitors. The SP310E provides an ON/OFF
input that simultaneously disables the internal
charge pump circuit and puts all transmitter and
receiver outputs into a high impedance state.
The SP312E is identical to the SP310E but with
seperate tri-state and shutdown inputs
Theory Of Operation
The SP202E, SP232E, SP233E, SP310E and
SP312E devices are made up of three basic
circuit blocks: 1. Drivers, 2. Receivers, and 3.
charge pump. Each block is described below.
Drivers
The drivers are inverting level transmitters that
convert TTL or CMOS logic levels to EIA/TIA-
232 levels with an inverted sense relative to
the input logic levels. The typical driver output
voltage swing is +/-6V. Even under worst case
loading conditions of 3k ohms and 2500pF, the
driver output is guaranteed to be +/-5.0V mini-
mum, thus satisfying the RS-232 specification.
The driver outputs are protected against infinite
short-circuits to ground without degradation in
reliability.
The slew rate of the driver output is internally
limited to 30V/μs in order to meet the EIA stan-
dards (EIA-232F). Additionally, the driver out-
puts LOW to HIGH transition meets the mon-
tonic output requirements of the standard.
In actual system applications, it is quite pos-
sible for signals to be applied to receiver inputs
before power is applied to the receiver circuitry.
This occurs, for example, when a PC user at-
tempts to print, only to realize that 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 devices are fully protected.
Charge pump
The charge pump is an Exar patented design
and uses a unique approach compared to
older less efficiant designs. The charge pump
requires 4 external capacitors and uses a four
phase voltage shifting technique. The internal
power supply consists of a dual charge pump
that provides a driver output voltage swing of
+/-6V. The internal oscillator controls the four
phases of the voltage shifting. A description of
each phase follows:
Phase 1
Vss charge store and double: The positive ter-
minals of capacitors C1 and C2 are charged
from Vcc with their negative terminals initially
connected to ground. C1+ is then connected
to ground and the stored charge from C1- is
superimposed onto C2-. Since C2+ is still con-
nected to Vcc the voltage potential across C2
is now 2 x Vcc.
Phase 2
Vss transfer and invert: Phase two connects
the negative terminal of C2 to the Vss storage
capacitor and the positive terminal of C2 to
ground. This transfers the doubled and invert-
ed (V-) voltage onto C4. Meanwhile, capacitor
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311



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SP202E datasheet


1. RS-232 Line Driver / Receiver

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