ADM3311E*

Features:

`Green Idle Power Saving Mode
`Full RS-232 Compliance
`Operates with 3 V Logic
`Low EMI
`Ultralow Power CMOS: 450
A Operation
`Low Power Shutdown: 20 nA
`460 kbits/s Data Rate
`0.1 F to 1 F Charge Pump Capacitors
`Single +2.7 V to +3.6 V Power Supply
`One Receiver Active in Shutdown
`ESD >15 kV
`Pin Compatible with DS14C335


Application

·Laptop Computers
·Notebook Computers
·Printers
·Peripherals
·Modems


Pinout




Specifications

V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +4 V
V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V_CC 0.3 V) to +8 V
V . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . +0.3 V to 8 V
Input Voltages
T_IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 0.3 V to +6 V
R_IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..  . . . . . . . . ±30 V
Output Voltages
T_OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . ±15 V
R_OUT . . . . . . . . . . . . . . . . . . . . .. . . . . 0.3 V to (VCC +0.3 V)
Short Circuit Duration
T_OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
Power Dissipation
RU-28 TSSOP (Derate 12 mW/ Above +70) .. . . . 900 mW
RS-28 SSOP (Derate 10 mW/ Above +70) . . .. . . 900 mW
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . .. .  . 40 to +85
Storage Temperature Range . . . . . . . . . . .. 65 to +150
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . .+300
ESD Rating (MIL-STD-883B) (I-O Pins) . . . . . .. . . . . . ±15 kV
ESD Rating (MIL-STD-883B) (Except I-O) . . . . .. .  . . ±3.0 kV
ESD Rating (IEC1000-4-2 Contact) (I-O Pins) . . ..  . . . ±8 kV
ESD Rating (IEC1000-4-2 Air) (I-O Pins) . . . . . . . . . . ±15 kV
EFT Rating (IEC1000-4-4) (I-O Pins) . . . . . . . . . ..  . . . ±4 kV


Description

The ADM3311E is a three driver/five receiver product designed to fully meet the EIA-232 standard while operating with a single +2.7 V to +3.6 V power supply. The ADM3311E features an on-board, charge pump, dc-to-dc converter, eliminating the need for dual power supplies. This ADM3311E dc-to-dc converter contains a voltage tripler and voltage inverter, which internally generates positive and negative supplies from the input +3 V power supply. The dcto- dc converter operates in Green Idle Mode, whereby the charge pump oscillator is gated on and off to maintain the output voltage at ±7.25 V under varying load conditions. This minimizes the power consumption and makes these products ideal for battery powered portable devices.

The ADM3311E is suitable for operation in harsh electrical environments and contains ESD protection up to ±15 kV on all I-O lines.

The ADM3311E contains three drivers and five receivers and is intended for serial port applications on notebook/laptop computers.

A shutdown facility is also provided that reduces the power consumption to 3 µW. While in shutdown, one receiver remains active, thereby allowing monitoring of peripheral devices. This feature of ADM3311E allows the device to be shut down until a peripheral device begins communication. The active receiver can alert the processor, which can then take the ADM3311E out of the shutdown mode.

The ADM3311E is fabricated using CMOS technology for minimal power consumption. It features a high level of overvoltage protection and latch-up immunity.

The ADM3311E is packaged in a 28-lead SSOP/TSSOP package.