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参数资料
| 型号： | SP320ACF |
| 元件分类： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收发器与0.1uF电容 |
| 文件页数： | 4/12页 |
| 文件大小： | 647K |
| 代理商： | SP320ACF |
4
Rev:A Date: 1/27/04 SP320 Complete +5V-Only V.35 Interface with RS-232 (V.28) Control Lines Copyright 2004 Sipex Corporation
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 transmitters,
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 impedance 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
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/
μ
s in order to meet the EIA
standards. The RS-232 drivers are rated for
120kbps 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.
The maximum operating voltage range for the
receiver is
±
30V, under these conditions the
input current to the receiver must be limited to
less than 100mA. The RS-232 receivers can
operate to beyond 120kbps.
CHARGE PUMP
The charge pump is a
Sipex
patented design
(U.S. 5,306,954) and uses a unique approach
compared to older less-efficient designs. The
charge pump still requires four external
capacitors, but uses a four-phase voltage
shifting technique to attain symmetrical
±
10V
power supplies. The capacitors can be as low
as 0.1
μ
F with a 16 Volt rating. Polarized or
non-polarized capacitors can be used.
THEORY OF OPERATION
The
SP320
is a single chip +5V-only serial
transceiver that supports all the signals neces-
sary 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)
drivers and four RS-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 terminals
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 1.
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 are
equipped with enable control lines. When the
enable pins are high the driver outputs are
disabled, the output impedance of a disabled
driver will nominally be 300
. When the enable
pins are low, the drivers are active.
V.35 Receivers
The V.35 receivers are +5V only, low power
differential receivers which meet the following
requirements:
1. Input impedance in the range of 100
±
10
.
2. Resistance to ground of 150
±
15
,
measured from short-circuited terminals.
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