ad7306jr-reel Analog Devices, Inc., ad7306jr-reel Datasheet

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ad7306jr-reel

Manufacturer Part Number
ad7306jr-reel
Description
+5 V Powered Rs-232/rs-422 Transceiver
Manufacturer
Analog Devices, Inc.
Datasheet
a
GENERAL DESCRIPTION
The AD7306 line driver/receiver is a 5 V monolithic product
which provides an interface between TTL signal levels and dual
standard EIA RS-232/RS-422 signal levels. The part contains
two RS-232 drivers, one RS-422 driver, one RS-232 receiver,
and one receiver path which can be configured either as RS-232
or as RS-422.
An internal charge pump voltage converter facilitates operation
from a single +5 V power supply. The internal charge pump
generates 10 V levels allowing RS-232 output levels to be de-
veloped without the need for external bipolar power supplies.
A highly efficient charge pump design allows operation using
non polarized, miniature 0.1 F capacitors. This gives a consid-
erable saving in printed circuit board space over conventional
products which can use up to 10 F capacitors. The charge
pump output voltages may also be used to power external cir-
cuitry which requires dual supplies.
REV. B
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.
FEATURES
RS-232 and RS-422 on One Chip
Single +5 V Supply
0.1 F Capacitors
Short Circuit Protection
Excellent Noise Immunity
Low Power BiCMOS Technology
High Speed, Low Skew RS-422 Operation
–40 C to +85 C Operations
APPLICATIONS
DTE-DCE Interface
Packet Switching
Local Area Networks
Data Concentration
Data Multiplexers
Integrated Services Digital Network (ISDN)
The RS-232 channels are suitable for communications rates up
to 100 kHz and the RS-422 channels are suitable for high speed
communications up to 5 MHz. The RS-422 transmitter comple-
mentary outputs are closely matched and feature low timing
skew between the complementary outputs. This is often an es-
sential requirement to meet tight system timing specifications.
All inputs feature ESD protection, all driver outputs feature
high source and sink current capability and are internally pro-
tected against short circuits on the outputs. An epitaxial layer is
used to guard against latch-up.
The part is available in a 24-lead SOIC and 24-pin plastic DIP
package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
R1
IN
T3
T3
/R1
R1
RS-232/RS-422 Transceiver
OUT
OUT
T1
T2
IN
IN
C1+
R2
C1–
V
OUT
OUT
NC
(B)
(A)
(B)
(A)
V+
CC
FUNCTIONAL BLOCK DIAGRAM
IN
10
12
11
1
2
3
4
5
6
7
8
9
NC = NO CONNECT
(Not to Scale)
AD7306
TOP VIEW
SOIC
+5 V Powered
19
18
16
15
14
13
22
20
17
24
23
21
AD7306
Fax: 617/326-8703
V–
R2
GND
R1
NC
C2–
C2+
T3
232/422 SEL
GND
T1
T2
IN
OUT
IN
IN
OUT

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ad7306jr-reel Summary of contents

Page 1

FEATURES RS-232 and RS-422 on One Chip Single +5 V Supply 0.1 F Capacitors Short Circuit Protection Excellent Noise Immunity Low Power BiCMOS Technology High Speed, Low Skew RS-422 Operation – +85 C Operations APPLICATIONS DTE-DCE Interface ...

Page 2

AD7306–SPECIFICATIONS Parameter RS-232 DRIVER TTL Input Logic Low, V INL TTL Input Logic High, V INH Input Logic Current RS-232 High Level Output Voltage RS-232 Low Level Output Voltage Output Short Circuit Current Slew Rate Output Resistance (Powered Down) RS-232 ...

Page 3

... Although the AD7306 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. Model AD7306JR AD7306JN AD7306AR AD7306AN REV. B ...

Page 4

AD7306 SOIC DIP Pin Pin Mnemonic Function Internally Generated Positive Supply (+9 V nominal). A 0.1 F capacitor must be connected between this pin and GND 20, 22 C1+, C1– External Capacitor 1 Terminals. A ...

Page 5

INPUT 0 C1+ V+ 10V 0 C1– POWER 22 SUPPLY C2+ V– GENERATOR 0 C2– TTL/CMOS INPUTS AD7306 ...

Page 6

AD7306 GENERAL DESCRIPTION The AD7306 drivers/receivers provide an interface which is compatible with RS-232/RS-422 standard interfaces. As both standards are widely accepted it is often necessary to provide an interface which is compatible with both. The AD7306 is ideally suited ...

Page 7

OUTPUT CURRENT Figure 8. V+ and V– Voltage vs. Current – 500 1000 1500 LOAD CAPACITANCE – pF ...

Page 8

AD7306 Single-Ended Data Transmission Single-ended interfaces are used for low speed, short distance communications such as from a computer terminal to a printer. A single line is used to carry the signal. Various standards have been developed to standardize the ...

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