0.1 F, +5 V Powered
CMOS RS-232 Drivers/Receivers
a
ADM205–ADM211/ADM213
TYPICAL OPERATING CIRCUIT
FEATURES
0.1 F to 10 F Capacitors
120 kB/s Data Rate
+5V INPUT
12 C1+
14 C1–
VCC 11
2 Receivers Active in Shutdown (ADM213)
On-Board DC-DC Converters
؎9 V Output Swing with +5 V Supply
Low Power (15 mW)
+5V TO +10V
VOLTAGE
DOUBLER
0.1µF
0.1µF
0.1µF
6.3V
16V
13
17
V+
V–
15 C2+
16 C2–
+10V TO –10V
VOLTAGE
INVERTER
0.1µF
16V
0.1µF
16V
Low Power Shutdown ≤5 W
؎30 V Receiver Input Levels
Latch-Up FREE
T1IN
T2
T1 OUT
T2 OUT
T3 OUT
T1
2
3
7
6
T2
N
I
TTL/CMOS
INPUTS*
RS-232
OUTPUTS
Plug-In Upgrade for MAX205-211/213
T3IN
T4
20
21
8
T3
1
28
9
T4
T4 OUT
R1 IN
N
I
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
R1
R1 OUT
5
4
R2 IN
R2
R2 OUT
R3 OUT
R4 OUT
R5 OUT
EN
RS-232
INPUTS**
TTL/CMOS
OUTPUTS
26
R3
27
23
18
25
R3 IN
R4 IN
22
19
24
R4
R5
R5 IN
SD
GND
10
ADM211
*INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT
**INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
GENERAL DESCRIPTION
active-high receiver enable control. Two receivers of the
ADM213 remain active during shutdown. This feature is useful
for ring indicator monitoring.
The ADM2xx family of line drivers/receivers is intended for all
EIA-232-E and V.28 communications interfaces, especially in
applications where ±12 V is not available. The ADM205,
ADM206, ADM211 and ADM213 feature a low power shut-
down mode which reduces power dissipation to less than 5 µW
making them ideally suited for battery powered equipment. The
ADM205 does not require any external components and is par-
ticularly useful in applications where printed circuit board space
is critical. The ADM213 has an active-low shutdown and an
All members of the ADM2xx family, except the ADM209, in-
clude two internal charge pump voltage converters which allow
operation from a single +5 V supply. These converters convert
the +5 V input power to the ±10 V required for RS-232 output
levels. The ADM209 is designed to operate from +5 V and
+12 V supplies. An internal +12 V to –12 V charge pump volt-
age converter generates the –12 V supply.
Table I. Selection Table
No. of
RS-232
No. of
RS-232
Low Power
Shutdown
(SD)
TTL
Three-State
EN
No. of Receivers
Active in
Shutdown
Part
Power
External
Number Supply Voltage
Drivers Receivers Capacitors
ADM205 +5 V
ADM206 +5 V
ADM207 +5 V
ADM208 +5 V
ADM209 +5 V & +9 V to +13.2 V
ADM211 +5 V
ADM213 +5 V
5
4
5
4
3
4
4
5
3
3
4
5
5
5
None
Yes
Yes
No
No
No
Yes
Yes (SD)
Yes
Yes
No
No
Yes
Yes
Yes (EN)
0
0
0
0
0
0
2
4
4
4
2
4
4
REV. 0
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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.
© Analog Devices, Inc., 1994
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Tel: 617/329-4700 Fax: 617/326-8703