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PDF SP208E Data sheet ( Hoja de datos )
| Número de pieza | SP208E | |
| Descripción | High ESD +5V RS-232 Transceivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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SP207E–SP213E
Low Power, High ESD +5V RS-232 Transceivers
■ Meets All EIA-232 and ITU V.28
Specifications
■ Single +5V Supply Operation
■ 3mA Typical Static Supply Current
■ 4 x 0.1μF External Charge Pump Capacitors
■ 120kbps Transmission Rates
■ Standard SOIC and SSOP Footprints
■ 1μA Shutdown Mode (SP211E & SP213E)
■ Two Wake-Up Receivers (SP213E)
■ Tri-State/RxEnable (SP211E & SP213E)
■ Improved ESD Specifications:
+15kV Human Body Model
+15kV IE6C1000-4-2 Air Discharge
+8kV IEC61000-4-2 Contact Discharge
Now Available in Lead Free Packaging
Device
Drivers Receivers Pins
SP207E
5
3 24
SP208E
SP211E
4
4
4 24
5 28
SP213E
4
5 28
+5V INPUT
0.1µF
6.3V
0.1µF
6.3V
0.1µF
16V
10
+
C1 +
12 C1 –
13
+
C2 +
14 C2 –
9
VCC
SP207E
0.1µF
+ 6.3V
V + 11
V – 15
0.1µF
16V
+
400kΩ
7
T1 IN
400kΩ
T1
2 T1 OUT
T2 IN 6
400kΩ
T2
3 T2 OUT
T3 IN 18
400kΩ
T3
1 T3 OUT
T4 IN 19
400kΩ
T4
24 T4 OUT
T5 IN 21
T5 20 T5 OUT
5
R1 OUT
R2 OUT 22
R3 OUT 17
R1
5kΩ
R2
5kΩ
R3
5kΩ
8
GND
4 R1 IN
23 R2 IN
16 R3 IN
Table 1. Model Selection Table
DESCRIPTION
The SP207E-SP213E are enhanced transceivers intended for use in RS-232 and V.28 se-
rial communication. These devices feature very low power consumption and single-supply
operation making them ideal for space-constrained applications. Exar on-board charge pump
circuitry generates fully compliant RS-232 voltage levels using small and inexpensive 0.1µF
charge pump capacitors. External +12V and -12V supplies are not required. The SP211E
and SP213E feature a low-power shutdown mode, which reduces power supply drain to
1µA. SP213E includes two receivers that remain active during shutdown to monitor for
signal activity.
The SP207E-SP213E devices are pin-to-pin compatible with our previous SP207, SP208,
SP211 and SP213 as well as industry-standard competitor devices. Driver output and re-
ceiver input pins are protected against ESD to over ±15kV for both Human Body Model and
IEC61000-4-2 Air Discharge test methods. Data rates of 120kbps are guaranteed, making
them compatible with high speed modems and PC remote-access applications. Receivers
also incorporate hysteresis for clean reception of slow moving signals.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP207E_101_101512
1 page  
features
The SP207E, SP208E, SP211E and
SP213E multi–channel transceivers fit most
RS-232/V.28 communication needs. All of
these devices feature low–power CMOS con-
struction and EXAR on-board charge pump
circuitry to generate RS-232 signal-voltages,
making them ideal for applications where
+9V and -9V supplies are not available. The
highly efficient charge pump is optimized
to use small and inexpensive 0.1µF charge
pump capacitors, saving board space and
reducing overall circuit cost.
Each device provides a different driver/
receiver combination to match standard
application requirements. The SP207E is
a 5-driver, 3-receiver device, ideal for DCE
applications such as modems, printers or
other peripherals. SP208E is a 4-driver/4-
receiver device, ideal for providing hand-
shaking signals in V.35 applications or other
general-purpose serial communications.
The SP211E and SP213E are each 3-driver,
5-receiver devices ideal for DTE serial ports
on a PC or other data-terminal equipment.
The SP211E and SP213E feature a low–
power shutdown mode, which reduces power
supply drain to 1µA. The SP213E includes a
Wake-Up function which keeps two receivers
active in the shutdown mode, unless disabled
by the EN pin.
The family is available in 28 and 24 pin SO
(wide) and SSOP (shrink) small outline pack-
ages. Devices can be specified for commer-
cial (0˚C to +70˚C) and industrial/extended
(–40˚C to +85˚C) operating temperatures.
Theory of Operation
Exar RS-232 transceivers contain three
basic circuit blocks — a) transmitter/driver,
b) receiver and c) the charge pump. SP211E
and SP213E also include SHUTDOWN and
ENABLE functions.
Transmitter/Drivers
The drivers are single-ended inverting trans-
mitters, which accept either TTL or CMOS
inputs and output the RS-232 signals with
an inverted sense relative to the input logic
levels. Should the input of the driver be left
open, an internal pullup to VCC forces the
input high, thus committing the output to a
logic-1 (MARK) state. The slew rate of the
transmitter output is internally limited to a
maximum of 30V/µs in order to meet the
EIA/RS-232 and ITU V.28 standards. The
transition of the output from high to low also
meets the monotonicity requirements of the
standard even when loaded. Driver output
voltage swing is ±7V (typical) with no load,
and ±5V or greater at maximum load. The
transmitter outputs are protected against
infinite short–circuits to ground without
degradation in reliability.
The drivers of the SP211E, and SP213E
can be tri–stated by using the SHUTDOWN
function. In this “power-off” state the charge
pump is turned off and VCC current drops to
1µA typical. Driver output impedance will
remain greater than 300Ω, satisfying the
RS-232 and V.28 specifications. For SP211E
SHUTDOWN is active when pin 25 is driven
high. For SP213E SHUTDOWN is active
when pin 25 is driven low.
Receivers
The receivers convert RS-232 level input
signals to invertedTTLlevel signals. Because
signals are often received from a transmis-
sion line where long cables and system
interference can degrade signal quality, the
inputs have enhanced sensitivity to detect
weakened signals. The receivers also fea-
ture a typical hysteresis margin of 500mV for
clean reception of slowly transitioning signals
in noisy conditions. These enhancements
ensure that the receiver is virtually immune
to noisy transmission lines.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP207E_101_101512
5 Page 
RC
DC Power
Source
SW1
Contact-Discharge Model
RS RV
SW2
CS
Device
Under
Test
RS and RV add up to 330Ω for IEC61000-4-2.
Figure 8. ESD Test Circuit for IEC61000-4-2
The Contact Discharge Method applies the
ESD current directly to the EUT. This method
was devised to reduce the unpredictability
of the ESD arc. The discharge current rise
time is constant since the energy is directly
transferred without the air-gap arc.
In situations such as hand held systems, the
ESD charge can be directly discharged to
the equipment from a person already holding
the equipment. The current is transferred
on to the keypad or the serial port of the
equipment directly and then travels through
the PCB and finally to the IC.
The circuit model in Figures 7 and 8 represent
the typical ESD testing circuit used for all
three methods. The CS is initially charged
with the DC power supply when the first
switch (SW1) is on.
Now that the capacitor is charged, the sec-
ond switch (SW2) is on while SW1 switches
off. The voltage stored in the capacitor is
then applied through RS, the current limiting
resistor, onto the device under test (DUT).
In ESD tests, the SW2 switch is pulsed so
that the device under test receives a dura-
tion of voltage.
For the Human Body Model, the current
limiting resistor (RS) and the source capacitor
30A
15A
0A
t=0ns
t
t=30ns
Figure 9. ESD Test Waveform for IEC61000-4-2
(CS) are 1.5kΩ an 100pF, respectively. For
IEC61000-4-2, the current limiting resistor
(aRnS1) 5a0npdFth, eressopuerccteivcealyp.acitor (CS) are 330Ω
TthheeIEhCig6h1e0r 0C0S-4v-a2lumeoadnedl alroewmeor rReSsvtrainlugeenint
than the Human Body Model. The larger
storage capacitor injects a higher voltage
to the test point when SW2 is switched on.
The lower current limiting resistor increases
the current charge onto the test point.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
SP207E_101_101512
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet SP208E.PDF ] | |
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