Ultralow Power +3.3 V, RS-232 Notebook PC Serial Port Drivers/Receivers ADM560/ADM561 FEATURES FUNCTIONAL BLOCK DIAGRAM +3.3V INPUT RS-232 compatible Operates with 3 V or 5 V logic 12 11 C1+ +3.3V TO +6.6V V + CC 1F C3 VOLTAGE 0.1F Ultralow power CMOS: 1.3 mA operation 10V 1F 14 C1 DOUBLER V+ 13 6.3V Low power shutdown: 0.2 A 15 C2+ + +6.6V TO 6.6V V 17 Suitable for serial port mice 1F VOLTAGE C4 10V 16 C2 INVERTER 1F 116 kbps data rate 10V 1 F charge pump capacitors T1 7 T1 2 T1 IN OUT Single +3 V to +3.6 V power supply T2 6 T2 3 T2 IN OUT Two receivers active in shutdown (ADM560) CMOS EIA/TIA-232 INPUTS OUTPUTS T3 20 T3 1 T3 IN OUT APPLICATIONS T4 21 T4 28 T4 IN OUT Notebook computers Peripherals 8 9 R1 R1 R1 OUT IN Modems 5 4 R2 R2 R2 OUT IN Printers CMOS Battery-operated equipment EIA/TIA-232 R3 26 R3 27 R3 OUT IN OUTPUTS INPUTS R4 22 R4 23 R4 OUT IN 19 18 R5 R5 R5 OUT IN ADM560/ SHDN (ADM560) EN (ADM560) 24 25 GND ADM561 SHDN (ADM561) EN (ADM561) 10 Figure 1. GENERAL DESCRIPTION The ADM560/ADM561 are four driver/five receiver interface device begins communication. The active receivers alert the processor, and then take the ADM560 out of shutdown mode. devices designed to meet the EIA-232 standard and operate with a single +3.3 V power supply. The devices feature an on-board The ADM561 features active high shutdown and an active dc-to-dc converter, eliminating the need for dual 5 V power low receiver enable. In this device, all receivers are disabled supplies. This dc-to-dc converter contains a voltage doubler in shutdown. and voltage inverter, both of which internally generate 6.6 V from the input +3.3 V power supply. The ADM560/ADM561 are fabricated using CMOS technology for minimal power consumption. They feature a high level of The ADM560 and the ADM561 consume only 5 mW making over-voltage protection and latch-up immunity. The receiver them ideally suited for battery and other power-sensitive appli- inputs can withstand up to 25 V levels. The transmitter inputs cations. A shutdown facility is also provided to reduce the power can be driven from either 3 V or 5 V logic levels. This allows to 0.66 W. operation in mixed 3 V/5 V power supply systems. The ADM560 contains active low shutdown and an active high The ADM560/ADM561 are packaged in a 28-lead SOIC and receiver enable signal. In shutdown mode, two receivers remain a 28-lead SSOP package. active, thereby allowing monitoring of peripheral devices. This feature allows the device to be shut down until a peripheral 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 05667-001 + +ADM560/ADM561 TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Function Descriptions..............................5 Applications....................................................................................... 1 Typical Performance Characteristics ..............................................6 Functional Block Diagram .............................................................. 1 Theory of Operation .........................................................................8 General Description ......................................................................... 1 Circuit Description .......................................................................8 Revision History ............................................................................... 2 Enable and Shutdown ...................................................................8 Specifications..................................................................................... 3 Outline Dimensions..........................................................................9 Absolute Maximum Ratings............................................................ 4 Ordering Guide .......................................................................... 10 ESD Caution.................................................................................. 4 REVISION HISTORY 9/06Rev. A to Rev. B Updated Format..................................................................Universal Changes to Specifications................................................................ 3 10/05Rev. 0 to Rev. A Updated Format..................................................................Universal Changes to Specifications................................................................ 3 Update to Outline Dimensions....................................................... 9 Changes to Ordering Guide .......................................................... 10 7/94Revision 0: Initial Version Rev. B Page 2 of 12