Ultralow Power +3.3 V, RS-232
Notebook PC Serial Port Drivers/Receivers
ADM560/ADM561
FEATURES
RS-232 compatible
Operates with 3 V or 5 V logic
Ultralow power CMOS: 1.3 mA operation
Low power shutdown: 0.2 μA
Suitable for serial port mice
116 kbps data rate
1 μF charge pump capacitors
Single +3 V to +3.6 V power supply
Two receivers active in shutdown (ADM560)
FUNCTIONAL BLOCK DIAGRAM
+3.3V INPUT
+
12
C1+
14
C1–
15
C2+
16
C2–
T1
IN
T2
IN
T3
IN
T4
IN
R1
OUT
R2
OUT
CMOS
OUTPUTS
R3
OUT
R4
OUT
R5
OUT
EN (ADM560)
EN (ADM561)
7
T1
T2
T3
T4
R1
R2
R3
R4
R5
GND
10
2
6
3
CMOS
INPUTS
20
1
APPLICATIONS
Notebook computers
Peripherals
Modems
Printers
Battery-operated equipment
21
8
28
9
5
4
26
27
22
23
19
18
24
Figure 1.
GENERAL DESCRIPTION
The ADM560/ADM561 are four driver/five receiver interface
devices designed to meet the EIA-232 standard and operate with
a single +3.3 V power supply. The devices feature an on-board
dc-to-dc converter, eliminating the need for dual ±5 V power
supplies. This dc-to-dc converter contains a voltage doubler
and voltage inverter, both of which internally generate ±6.6 V
from the input +3.3 V power supply.
The ADM560 and the ADM561 consume only 5 mW making
them ideally suited for battery and other power-sensitive appli-
cations. A shutdown facility is also provided to reduce the power
to 0.66 μW.
The ADM560 contains active low shutdown and an active high
receiver enable signal. In shutdown mode, two receivers remain
active, thereby allowing monitoring of peripheral devices. This
feature allows the device to be shut down until a peripheral
device begins communication. The active receivers alert the
processor, and then take the ADM560 out of shutdown mode.
The ADM561 features active high shutdown and an active
low receiver enable. In this device, all receivers are disabled
in shutdown.
The ADM560/ADM561 are fabricated using CMOS technology
for minimal power consumption. They feature a high level of
over-voltage protection and latch-up immunity. The receiver
inputs can withstand up to ±25 V levels. The transmitter inputs
can be driven from either 3 V or 5 V logic levels. This allows
operation in mixed 3 V/5 V power supply systems.
The ADM560/ADM561 are packaged in a 28-lead SOIC and
a 28-lead SSOP package.
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 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
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
05667-001
ADM560/
ADM561
25
+
1µF +
10V
+6.6V TO –6.6V
VOLTAGE
INVERTER
V–
17
+
1µF
10V
+3.3V TO +6.6V
VOLTAGE
DOUBLER
V
CC 11
V+
13
C3
1µF
6.3V
C4
1µF
10V
0.1µF
T1
OUT
T2
OUT
T3
OUT
T4
OUT
R1
IN
R2
IN
R3
IN
R4
IN
R5
IN
SHDN (ADM560)
SHDN (ADM561)
EIA/TIA-232
INPUTS
EIA/TIA-232
OUTPUTS
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