Features: RS-232 Compatible
Operates with 3 V or 5 V Logic
Ultralow Power CMOS: 1.3 mA Operation
Low Power Shutdown: 0.2 mA
Suitable for Serial Port Mice
116 kbits/s Data Rate
1 mF Charge Pump Capacitors
Single +3 V to +3.6 V Power Supply
Two Receivers Active in Shutdown (ADM560)ApplicationLaptop Computers
Palmtop Computers
Notebook Computers
Peripherals
Modems
Printers
Battery Operated EquipmentPinout
Specifications(TA = +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 0.3 V to +6 V
V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. (VCC 0.3 V) to +14 V
V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to 14 V
Input Voltages
TIN . . . . . . . . . . . . . . . . . . . . . . . . ......... 0.3 V to (V+, +0.3 V)
RIN . . . . . . . . . . . . . . . . . . . . . . . . . .... . . . . . . . . . . . . . .±25 V
Output Voltages
TOUT . . . . . . . . . . . . . . . ........ . . . (V+, +0.3 V) to (V, 0.3 V)
ROUT . . . . . . . . . . . . . . . . . . ...... . . . . . 0.3 V to (VCC +0.3 V)
Short Circuit Duration
TOUT . . . . . . . . . . . . . . . . . . . . . ....... . . . . . . . . . . . Continuous
DescriptionThe ADM560/ADM561 are four driver/five receiver interfacedevices designed to meet the EIA-232 standard while operating with a single +3.3 V power supply. The devices feature an onboard dc-to-dc converter, eliminating the need for dual ±5 V power supplies. This dc-dc converter contains a voltage doubler
and voltage inverter which internally generates ±6.6 V from the input +3.3 V power supply.
The ADM560/ADM561 consume only 5 mW making them ideally suited for battery and other power-sensitive applications. A shutdown facility is also provided which reduces the power to 0.66 mW.
The ADM560/ADM561 contains active low shutdown and active high receiver enable signals. 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 can alert the processor which can then take the ADM560 out of the shutdown mode.
The ADM560/ADM561 features active high shutdown and an active low receiver enable. In this device all receivers are disabled in shutdown.
The ADM560/ADM561 is fabricated using CMOS technology for minimal power consumption. It features a high level of overvoltage protection and latch-up immunity. The receiver inputscan 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 is packaged in a 28-pin SO and a 28-pin SSOP package.
ADM561 Data Sheet
