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參數(shù)資料
| 型號： | SP320ACM-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 V.35 80LQFP |
| 標準包裝： | 84 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 7/7 |
| 規(guī)程： | RS232 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-LQFP |
| 供應商設備封裝： | 80-LQFP（14x14） |
| 包裝： | 托盤 |
4
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50) 668-707 www.exar.com
SP320_00_092208
±10.
2. Resistance to ground of 150 ±15,
measured from short-circuited terminals.
All of the V.35 receivers can operate at data
rates as high as 5Mbps. The sensitivity of
the V.35 receiver inputs is ±300mV.
rs-232 (V.28) drivers
The RS-232 drivers are inverting transmit-
ters, which accept either TTL or CMOS
inputs and output the RS-232 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 infinite short-circuits to
ground without degradation in reliability.
In the power off state, the output imped-
ance of the RS-232 drivers will be greater
than 300 over a ±2V range. Should the
input of a driver be left open, an internal
400k pullup resistor to V
CC forces the
input high, thus committing the output to
a low state. The slew rate of the trans-
mitter output is internally limited to a
maximum of 30V/s in order to meet the EIA
standards. The RS-232 drivers are rated for
20kbps data rates.
rs-232 (V.28) receivers
The RS-232 receivers convert RS-232
input signals to inverted TTL signals. Each
of the four receivers features 500mV of
hysteresis margin to minimize the effects
of noisy transmission lines. The inputs also
have a 5k resistor to ground; in an open
circuit situation the input of the receiver
will be forced low, committing the output
to a logic high state. The input resistance
will maintain 3k-7k over a ±15V range.
Themaximumoperatingvoltagerangeforthe
receiver is ±30V, under these conditions the
input current to the receiver must be limited
to less than 00mA. The RS-232 receivers
can operate to beyond 20kbps.
cHArGe pUMp
ThechargepumpisanExarpatenteddesign
(U.S.5,306,954)andusesauniqueapproach
compared to older less-efficient designs.
The charge pump still requires four external
tHeorY oF operAtion
The
sp320 is a single chip +5V-only serial
transceiver that supports all the signals
necessary to implement a full V.35 interface.
Three V.35 drivers and three V.35 receivers
make up the clock and data signals. Four
RS-232(V.28)driversandfourRS-232(V.28)
receivers are used for control line signals for
the interface.
V.35 drivers
The V.35 drivers are +5V-only, low power
voltage output transmitters. The drivers do
not require any external resistor networks,
and will meet the following requirements:
1. Source impedance in the range of 50
to 150.
2. Resistance between short-circuited ter-
minals and ground is 150 ±15.
3. When terminated with a 100 resistive
load the terminal to terminal voltage will be
0.55 Volts ±20% so that the A terminal is
positive to the B terminal when binary 0 is
transmitted, and the conditions are reversed
to transmit binary .
4. The arithmetic mean of the voltage of the
A terminal with respect to ground, and the B
terminal with respect to ground will not
exceed 0.6 Volts when terminated as in 3
above.
The V.35 drivers can operate at data rates
as high as 5Mbps. The driver outputs are
protected against short-circuits between
the A and B outputs and short circuits to
ground.
Two of the V.35 drivers, DRIN2 and DRIN3
areequippedwithenablecontrollines.When
theenablepinsarehighthedriveroutputsare
disabled,theoutputimpedanceofadisabled
driver will nominally be 300. When the en-
able pins are low, the drivers are active.
V.35 receivers
The V.35 receivers are +5V only, low power
differential receivers which meet the follow-
ing requirements:
1. Input impedance in the range of 100
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