參數(shù)資料
型號(hào)： SP207ECA-L/TR
廠商： Exar Corporation
文件頁(yè)數(shù)： 15/19頁(yè)
文件大小： 0K
描述： IC TXRX RS232 ESD LP 24SSOP
標(biāo)準(zhǔn)包裝： 1,500
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 5/3
規(guī)程： RS232
電源電壓： 4.5 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 24-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 24-SSOP
包裝： 帶卷 (TR)
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP207E_0_052
FEATuRES
The SP207E, SP208E, SP211E and
SP213E multi–channeltransceiversfitmost
RS-232/V.28communicationneeds.Allof
thesedevicesfeaturelow–powerCMOScon-
struction and
ExAR on-board charge pump
circuitrytogenerateRS-232signal-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.F 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.
SP208Eisa4-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–
powershutdownmode,whichreducespower
supply drain to A. The
SP213E includes a
Wake-Upfunctionwhichkeepstworeceivers
activeintheshutdownmode,unlessdisabled
by the EN pin.
Thefamilyisavailablein28and24pinSO
(wide)andSSOP(shrink)smalloutlinepack-
ages.Devicescanbespecifiedforcommer-
cial(0Cto+70C)andindustrial/extended
(–40Cto+85C)operatingtemperatures.
THEORY OF OPERATION
Exar RS-232 transceivers contain three
basiccircuitblocks—a)transmitter/driver,
b)receiverandc)thechargepump.
SP211E
and
SP213EalsoincludeSHUTDOWNand
ENABLE functions.
Transmitter/Drivers
The drivers are single-ended inverting trans-
mitters,whichaccepteitherTTLorCMOS
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.Theslewrateofthe
transmitter output is internally limited to a
maximum of 30V/s in order to meet the
EIA/RS-232andITUV.28standards.The
transition of the output from high to low also
meets the monotonicity requirements of the
standard even when loaded. Driver output
voltageswingis±7V(typical)withnoload,
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
canbetri–statedbyusingtheSHUTDOWN
function. In this “power-off” state the charge
pump is turned off and V
CC current drops to
A typical. Driver output impedance will
remain greater than 300, satisfying the
RS-232andV.28specifications.For
SP211E
SHUTDOWNisactivewhenpin25isdriven
high. For
SP213ESHUTDOWNisactive
when pin 25 is driven low.
Receivers
The receivers convert RS-232 level input
signalstoinvertedTTLlevelsignals.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
cleanreceptionofslowlytransitioningsignals
in noisy conditions. These enhancements
ensure that the receiver is virtually immune
to noisy transmission lines.
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