參數(shù)資料
型號(hào): SP207CA-L/TR
廠商: Exar Corporation
文件頁(yè)數(shù): 11/14頁(yè)
文件大小: 0K
描述: IC TXRX RS232 SERIAL 24SSOP
產(chǎn)品變化通告: Interface Product Discontinuation 10/May/2011
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)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-7000 Fax (50)668-707 www.exar.com SP206, 207, 208, 2_0_060
6
DESCRIPTION
RECEIVERS
The receivers convert RS-232 input signals to
inverted TTL signals. Since the input is usu-
ally from a transmission 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 re-
ceiver is virtually immune to noisy transmission
lines. 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.
SHUTDOWN MODE
The SP206 and SP2 feature a control input
(SD) which will disable the device and reduce
the power supply current to less than 0A,
making the parts ideal for battery-powered sys-
tems. In the "shutdown" mode the receivers
and transmitters will both be tri-stated. The V+
output of the charge pump will discharge to Vcc
and the V- output will discharge to ground.
ENAblE (EN)
The SP206 and SP2 feature an enable input
which allows the receiver outputs to be either
tri-stated or enabled. This can be especially
useful when the receiver is tied directly to a
microprocessor data bus. The enable pin is
active high.
Figure . Charge Pump Waveforms
+0V
-0V
GND
a) C2+
b) C2+
VCC = +5V
–5V
+5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
Figure 2, Charge pump - Phase
TRANSMITTER/DRIVER
The drivers are inverting transmitters, which ac-
cept either TTL or CMOS inputs and output the
RS-232 output signals with an inverted sense
relative to the input logic levels. Typically, the
RS-232 output voltage swing is +/-9V with no
load, and +/-5V minimum with full load. The
transmitter outputs are protected against infi-
nite short-circuits to ground without degrada-
tion in reliability. The drivers of the SP206 and
SP2 can be tri-stated by using the SHUT-
DOWN function.
In the "power off" state, the output impedance
will remain greater than 300 Ohms, again satis-
fying the RS-232 specifications. Should the input
of the driver be left open, an internal 400kOhm
pull-up resistor to Vcc forces the input high, thus
committing the output to a low state. The slew
rate of the transmitter output is internally limited
to a maximum of 30V/s in order to meet he EIA
standards (EIA RS-232D 2,,7, Paragraph 5).
The transition of the loaded output from high to
low also meets the monotonicity requirements
of the standard.
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