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PDF AD233 Data sheet ( Hoja de datos )
| Número de pieza | AD233 | |
| Descripción | (AD230 - AD241) CMOS RE-232 Drivers / Receivers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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-D~ ~5C-c::t\ +~VI u
,. ANALOG
+5 V Powered
W DEVICES
CMOSRS-232Drivers/Receivers
FEATURES
Single 5 V Power Supply
Meets All RS-232-C and V.28 Specifications
Multiple Drivers and Receivers
On-Board DC-DC Converters
:t:9 V Output Swing with +5 V Supply
low Power CMOS: 5 mA Operation
low Power Shutdown $1 p.A
3-State TTl/CMOS Receiver Outputs
:t:30 V Receiver Input levels
Plug-In Replacement for MAX230-241
APPLICATIONS
Computers
Peripherals
OModems
Printers
BInstruments
SGENERAL DESCRIPTION
OThe AD230 family of 5 V only, RS-232 line drivers/receivers
provides a variety of configurations to fit most communication
Lneeds, especially in applications where :t 12 V is not available.
EThe AD230, AD235, AD236 and AD241 feature a low power
shutdown mode which reduces power dissipation to less than
TE5 j.LW making them ideally suited for battery powered equip-
1\ll members of the AD230 family, except the AD231 and the
AD239, include tWointernal charge pump voltage converters
which allow operation from a single +5 V supply. These con-
verters convert the + 5 V input power to the :t 10 V required for
RS-232 output levels. The AD231 and AD239 are designed to
operate from +5 V and + 12 V supplies. An internal + 12 V to
- 12 V charge pump voltage converter generates the - 12 V
supply.
ment. The AD233 and AD235 do not require any external com- In order to minimize the package count in all applications, a
ponents and are particularly useful in applications where printed wide selection of driver/receiver combinations is available (see
circuit board space is critical.
table below).
SELECTION TABLE
Part
Number
AD230
AD231
AD232
AD233
AD234
AD235
AD236
AD237
AD238
AD239
AD241
Power
Supply Voltage
+5 V
+5 V & +7.5 V
to 13.2V
+5 V
+5 V
+5 V
+5 V
+5 V
+5 V
+5 V
+5 V & +12 V
+5 V
No. of
RS-232
Drivers
5
2
2
2
4
5
4
5
4
3
4
No. of
RS-232
Receivers
0
2
2
2
0
5
3
3
4
5
5
External
Capacitors
4
2
4
None
4
None
4
4
4
2
4
Low Power
Shutdown
(SD)
Yes
No
TTL
Three-State
EN
No
No
No No
No No
No No
Yes Yes
Yes Yes
No No
No No
No Yes
Yes Yes
No. of
Pins
20
14
16
20
16
24
24
24
24
24
28
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use; nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
Twx: 710/394-6577
Telex: 924491
Cable: ANALOG NORWOODMASS
"
1 page  
J +5VINPUT
T10UT
T2oUT
T21N
AD234
T1'N
7.
C1+
6
Vcc
+5V TO +10V
8
9Ic1-VOLTAGE DOUBLER V+
12
101C2+ +10V TO -10V V-
10l1F
C2-VOLTAGE INVERTER
~+16V
4
T10UT
T11N
TOP VIEW
GND
(Not to Scale)
T2'N
3
2
T20UT
Vcc
iC1+
V+ C1-
)OBSO . - .Figure 9. AD234 DIP/SOICPin Configuration
TINTLP/UCMTSO*S
T3'N
13
RS-232
OUTPUTS
16
T30UT
T4'N
141
I
P5 T40UT
AD234
GND
~
'INTERNAL 400kfi PULL-UP RESISTORON EACH TTL/CMOS INPUT
Figure 10. AD234 Typical Operating Circuit
) LE+5VINPUT
TEv1:2
\)
T4oUT
T30UT
T10UT
T2 OUT
R21N
R2
T21N 7
T1IN
AD235
TOP VIEW
(Not to Scale)
R1oUT
T1'N
8
3 T10UT
T20N
~TIL/CMOS
INPUTS'
I T3'N
7
15
4 T2oUT
2 I RS-232
rT30UT OUTPUTS
:~1T~5: 'N
15
~T~15ouT
AD235
R1ouT
9
10 R1'N
R2oUT
6
5 R2'N
TIL/CMOS I
1OUTPUTS
R3oUT
R4oUT
23
17
~24 RS-232
IR3'N INPUTS"
18 R4.N
Figure 11. AD235 DIP Pin Configuration
)
R5oUT
-
EN
14
~
GND
13
R5'N
~
SD
~11
'INTERNAL4OOkU PUll-UP RESISTOR ON EACH TTlfCMOS INPUT
"INTERNAl SkU PUll-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 12. AD235 Typical Operating Circuit
-5-
5 Page 
, Enable Input
The AD235, AD236, AD239 and AD241 feature an enable in-
put (EN). It is used to enable the receiver outputs. With
EN = 0 V the outputs are enabled. With EN = 5 V the outputs
are placed in a high impedance state. This function allows the
outputs to be connected directly to a microprocessor data bus. It
can also be used to allow receivers from different devices to
share a common data line. The timing diagram for the enable
function is shown in Figure 25.
If there is a possibility that the Vcc supply will be switched on
first, or if the 12 V supply may be inadvertently shorted to
ground, then it is recommended that a diode (IN914 or equiva-
lent) be connected in series with the 12 V input. This will not
affect normal operation but it ensures that under fault condi-
tions, the device will be protected.
+SV +12V
3V Lf:.
EN
\ Iov
TEN
) O ..-ROUT
I
I
I
I
.I......-
I
I
I
I
-...T DlS
I
I
' VOH- O.1V
t3.SV
O.8V
DATA VALID
+- VOL+O.1V
BSFigure 25. Enable Timing
) OLAPPLICATION HINTS
ETProtection for Shorts to z15 V Supplies
EThe driver outputs are internally protected against shorting to
Vcc V+
AD231 & AD239
{/
Figure 27. Diode Protection Scheme for AD231 and AD239
High Baud Rate Operation
The RS-232-C standard requires that "For Data and Timing
interchangeCircuits, the timefor the signal to pass through the tran-
sition regionshall not exceed one millisecondorfour percent of the
nominal duration of the signal elementon that interchangecircuit,
whichever is the lesser." With the maximum transmission rate of
19.2 kbaud, this translates into a minimum slew rate of 3 V/J.Ls.
The typical slew rate of the AD230-AD241 is 3 V/J.Lsunder
maximum loading conditions and therefore meets the standard.
ground, to other driver outputs, to V+ or to V-. In practice,
these are the highest voltages likely to be encountered in an ap-
plication. lithe possibility exists for shorting to :t 15 V, then it
is recommended that external protection be provided. This may
be done by connecting a series 220 !1 resistor on each transmit-
ter output.
The V.28 standard is more stringent and requires a transition
time which will not exceed three percent of the nominal signal
duration. This translates into a slew rate of 4 V/J.Lsat the maxi-
mum 19.2 kbaud rate. In practice, less than ideal slew rates will
have negligible affect on the data transmission. The result is that
the valid mark/space duration is slightly shorter than the opti-
) mum because the signal spends more time in the transition re-
gion. The valid duration remains more than adequate for error-
free reception even at maximum transmission rates and under
worst case load conditions.
AD230-AD241
Figure 26. Protection for Shorts to :!::15 V
Over.Voltag~ Protection for AD231, AD239
The AD231 and AD239 require an external + 12 V supply as
) they do not contain an internal V+ generator. It is important
that this supply be switched on before the 5 V, Vcc supply.
Driving Long Cables
In accordance with the RS-232-C standard, long cables are per-
missible provided that the total load capacitance does not exceed
2500 pF. For longer cables which do exceed this, then it is pos-
sible to trade off baud rate vs. cable length. Large load capaci-
tances cause a reduction in slew rate, and hence the maximum
transmission baud rate is decreased. The AD23D-AD241 are
designed so that the slew rate reduction with increasing load
capacitance is minimized.
For the receivers, it is important that a high level of noise im-
munity be inbuilt so that slow rise and fall times do not cause
multiple output transitions as the signal passes slowly through
the transition region. The AD230-AD241 have 0.5 V of hystere-
sis to guard against this. This ensures that, even in noisy envi-
ronments, error-free reception can be achieved.
-11-
~ --
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AD233.PDF ] | |
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