a
+5 V Powered
RS-232/RS-422 Transceiver
AD7306
FEATURES
RS-232 and RS-422 on One Chip
Single +5 V Supply
0.1 mF Capacitors
Short Circuit Protection
Excellent Noise Immunity
Low Power BiCMOS Technology
High Speed, Low Skew RS-422 Operation
–408C to +858C Operations
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
DTE-DCE Interface
Packet Switching
Local Area Networks
Data Concentration
Data Multiplexers
Integrated Services Digital Network (ISDN)
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 developed without the need for external bipolar power supplies.
A highly efficient charge pump design allows operation using
non polarized, miniature 0.1 µF capacitors. This gives a considerable saving in printed circuit board space over conventional
products which can use up to 10 µF capacitors. The charge
pump output voltages may also be used to power external circuitry which requires dual supplies.
Rev. D
V+
1
24
V–
C1+
2
23
C2–
C1–
3
22
C2+
R2 IN
4
21
R2 OUT
T1OUT
5
20
T1IN
T2OUT
6
19
T2IN
VCC
7
18
GND
17
R1 OUT
AD7306
SOIC
TOP VIEW
(Not to Scale)
R1 IN (B)
8
R1 IN /R1 IN (A)
9
16
T3IN
T3OUT (B)
10
15
232/422 SEL
T3OUT (A)
11
14
GND
NC
12
13
NC
NC = NO CONNECT
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 complementary outputs are closely matched and feature low timing
skew between the complementary outputs. This is often an essential 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 protected 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.
Document Feedback
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2018 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
AD7306–SPECIFICATIONS (VT
CC
MAX
Parameter
RS-232 DRIVER
TTL Input Logic Low, VINL
TTL Input Logic High, VINH
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 RECEIVER
Input Voltage Range
RS-232 Input Threshold Low
RS-232 Input Threshold High
RS-232 Input Hysteresis
RS-232 Input Resistance
TTL Output Voltage Low, VOL
TTL Output Voltage High, VOH
RS-422 DRIVER
TTL Input Logic Low, VINL
TTL Input Logic High, VINH
Logic Input Current
Differential Output Voltage
= +5 V 6 5%, C1 = C2 = C3 = C4 = 0.1 mF. All specifications TMIN to
unless otherwise noted.)
Min
Typ
2.0
5.0
–5.0
±5
8
300
–15
0.8
0.1
3
3.5
0.1
7.3
–6.5
± 12
20
4
10M
Max
Units
Test Conditions/Comments
0.8
V
V
µA
V
V
mA
V/µs
V/µs
Ω
VIN = 0 V to VCC
RL = 3 kΩ
RL = 3 kΩ
VOUT = 0 V, TA = 0°C to +70°C
CL = 50 pF, RL = 3 kΩ
CL = 2500 pF, RL = 3 kΩ
VCC = 0 V, VOUT = ± 3 V
V
V
V
V
kΩ
V
V
IOUT = +4 mA
IOUT = –4 mA
± 10
30
+15
1.3
1.7
0.4
5
0.2
4.8
2.4
1.0
7
0.4
0.8
2.0
0.1
± 10
5.0
2
Common-Mode Output Voltage
∆|VOUT| for Complementary O/P States
Output Short Circuit Current
RS-422 RECEIVER
Common-Mode Voltage Range
Differential Input Threshold Voltage
Input Voltage Hysteresis
Input Resistance
TTL Output Voltage Low, VOL
TTL Output Voltage High, VOH
232/422 SEL Input
Input Logic Low, VINL
Input Logic High, VINH
Logic Input Current
35
3
0.2
150
–0.2
±7
+0.2
3
3.5
70
5
0.2
4.8
7
0.4
0.8
V
V
µA
V
V
V
V
mA
VIN = 0 V to VCC
VCC = 5 V, RL Diff = ∞; Figure 3
RL Diff = 100 Ω; Figure 3
RL Diff = 100 Ω
0 V ≤ VCMR ≤ +7 V
V
V
mV
kΩ
V
V
Typical RS-422 Input Voltage
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