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
ADM560/ADM561
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions..............................5
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................8
Circuit Description .......................................................................8
Enable and Shutdown ...................................................................8
Outline Dimensions ..........................................................................9
Ordering Guide .......................................................................... 10
REVISION HISTORY
9/06—Rev. A to Rev. B
Updated Format..................................................................Universal
Changes to Specifications ................................................................ 3
10/05—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Changes to Specifications ................................................................ 3
Update to Outline Dimensions....................................................... 9
Changes to Ordering Guide .......................................................... 10
7/94—Revision 0: Initial Version
Rev. B | Page 2 of 12
ADM560/ADM561
SPECIFICATIONS
V
CC
= +3.3 V ± 10%, C1 to C4 = 1 μF, all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
Output Voltage Swing
V
CC
Power Supply Current
Shutdown Supply Current
Input Logic Threshold Low, V
INL
Input Logic Threshold High, V
INH
Logic Pull-Up Current
EIA-232 Input Voltage Range
EIA-232 Input Threshold Low
EIA-232 Input Threshold High
EIA-232 Input Hysteresis
EIA-232 Input Resistance
CMOS Output Voltage Low, V
OL
CMOS Output Voltage High, V
OH
CMOS Output Leakage Current
Output Enable Time
Output Disable Time
Receiver Propagation Delay
TPHL
TPLH
Transition Region Slew Rate
Transmitter Output Resistance
RS-232 Output Short-Circuit Current
Min
±5.0
±4
Typ
±5.5
±4.5
3.5
3.5
0.2
Max
Unit
V
V
mA
mA
μA
V
V
μA
V
V
V
V
kΩ
V
V
μA
ns
ns
μs
μs
V/μs
Ω
mA
Test Conditions/Comments
V
CC
= 3.3 V, three transmitter outputs loaded with 3 kΩ to ground
V
CC
= 3.0 V, all transmitter outputs, loaded with 3 kΩ to ground
No load, T
IN
= V
CC
No load, T
IN
= GND
SHDN = GND (ADM560), SHDN = V
CC
(ADM561), T
IN
= V
CC
T
IN
, EN, EN , SHDN, SHDN
T
IN
, EN, EN, SHDN, SHDN
T
IN
= GND
5
5
5
0.4
20
+25
2.4
7
0.4
±5
2.4
3
–25
0.4
0.8
1.1
0.3
5
3
2.8
+0.05
100
50
0.1
0.5
4.5
300
±10
I
OUT
= 1.6 mA
I
OUT
= −40 mA
EN = V
CC
, EN = GND, 0 V ≤ R
OUT
≤ V
CC
1
2
R
L
= 3 kΩ, C
L
= 2500 pF measured from +3 V to −3 V or
−3 V to +3 V
V
CC
= V+ = V− = 0 V, V
OUT
= ±2 V
Rev. B | Page 3 of 12
ADM560/ADM561
ABSOLUTE MAXIMUM RATINGS
T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
V
CC
V+
V−
Input Voltages
T
IN
R
IN
Output Voltages
T
OUT
R
OUT
Short-Circuit Duration
T
OUT
Power Dissipation
SSOP
SOIC
Operating Temperature Range
Commercial (J Version)
Storage Temperature Range
Lead Temperature
(Soldering, 10 sec)
ESD Rating
Rating
−0.3 V to +6 V
(V
CC
− 0.3 V) to +14 V
+0.3 V to −14 V
−0.3 V to (V+, +0.3 V)
25 V
(V+, +0.3 V) to (V−, −0.3 V)
−0.3 V to (V
CC
+ 0.3 V)
Continuous
900 mW
900 mW
0°C to +70°C
−65°C to +150°C
+300°C
>2000 V
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product 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.
Rev. B | Page 4 of 12
ADM560/ADM561
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
T3
OUT 1
T1
OUT 2
T2
OUT 3
R2
IN 4
R2
OUT 5
T2
IN 6
T1
IN 7
R1
OUT 8
R1
IN 9
GND
10
V
CC 11
C1+
12
28
27
26
T4
OUT
R3
IN
R3
OUT
SHDN
EN
R4
IN
R4
OUT
T4
IN
T3
IN
R5
OUT
R5
IN
V–
05667-002
T3
OUT 1
T1
OUT 2
T2
OUT 3
R2
IN 4
R2
OUT 5
T2
IN 6
T1
IN 7
R1
OUT 8
R1
IN 9
GND
10
V
CC 11
C1+
12
28
27
26
T4
OUT
R3
IN
R3
OUT
SHDN
EN
R4
IN
R4
OUT
T4
IN
T3
IN
R5
OUT
R5
IN
V–
C2+
05667-012
TOP VIEW
(Not to Scale)
ADM560
25
24
23
22
21
20
19
18
17
16
15
TOP VIEW
(Not to Scale)
ADM561
25
24
23
22
21
20
19
18
17
16
15
V+
13
C1–
14
C2–
C2+
V+
13
C1–
14
C2–
Figure 2.ADM560 Pin Configuration
Figure 3. ADM561 Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
2, 3, 1, 28
9, 4, 27, 23, 18
8, 5, 26, 22, 19
7, 6, 20, 21
10
11
12, 14
13
15, 16
17
24
25
Mnemonic
T1
OUT
to T4
OUT
R1
IN
to R5
IN
R1
OUT
to R5
OUT
T1
IN
to T4
IN
GND
V
CC
C1+, C1−
V+
C2+, C2−
V−
EN/EN
SHDN/SHDN
Description
Transmitter (Driver) Outputs. Typically ±6 V.
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is
connected on each of these inputs.
Receiver Outputs. These are 3 V logic levels.
Transmitter (Driver) Inputs. These inputs accept 3 V or 5 V logic levels. An internal 400 kΩ pull-up resistor
to V
CC
is connected on each input.
Ground Pin. Must be connected to 0 V.
Power Supply Input 3.3 V ± 10%.
External Capacitor 1 is connected between these pins.
Internally Generated Positive Supply. +6.6 V nominal.
External Capacitor 2 is connected between these pins.
Internally Generated Negative Supply. −6.6 V nominal.
Receiver Enable. EN, active high on ADM560. EN, active low on ADM561. Refer to Table 4.
Shutdown Control. SHDN, active low on ADM560. SHDN, active high on ADM561. Refer to Table 4.
Table 4. ADM560/ADM561 Enable and Shutdown Control
Normal Operation
ADM560
SHDN = 1
EN = 1; receivers active
EN = 0; receivers inactive
SHDN = 0
EN = 1; Receiver R1 to Receiver R3 inactive
EN = 1; Receiver R4 and Receiver R5 active
EN = 0; Receiver R1 to Receiver R5 inactive
ADM561
SHDN = 0
EN = 0; receivers active
EN = 1; receivers inactive
SHDN = 1
EN = 0; receivers inactive
EN = 1; receivers inactive
Shutdown Mode
Rev. B | Page 5 of 12
