MAX3221 General Description
The MAX3221/MAX3223/MAX3243 achieve 1A supply current with Maxim's revolutionary AutoShutdown™ feature. When the MAX3221/MAX3223/MAX3243 do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected, peripheral are turned off.The system turns on again when a valid level is applied to any RS-232 receiver input. As a result, the system saves power without changes to the existing BIOS or operating system.
The MAX3221/MAX3223/MAX3243 transceivers are 3Vpowered EIA/TIA-232 and V.28/V.24 communications interfaces intended for notebook computer applications.A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. A guaranteed data rate of 120kbps provides compatibility with popular software for communicating with personal computers.
MAX3221 Maximum Ratings
VCC.........................................................................-0.3V to +6V
V+ (Note 1) ............................................................-0.3V to +7V
V- (Note 1) .............................................................+0.3V to -7V
V+ + |V-| (Note 1)..............................................................+13V
Input Voltages
T_IN, FORCEOFF, FORCEON, EN (MAX3223) ...........-0.3V to +6V
R_IN ..................................................................................±25V
Output Voltages
T_OUT.............................................................................±13.2V
R_OUT, INVALID ........................................-0.3V to (VCC + 0.3V)
Short-Circuit Duration
T_OUT ......................................................................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C) ..........571mW
16-Pin TSSOP (derate 6.70mW/°C above +70°C) ........533mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...89mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
20-Pin TSSOP DIP (derate 7.00mW/°C above +70°C)...559mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) ..........1W
28-Pin SSOP (derate 9.52mW/°C above +70°C) ..........762mW
28-Pin TSSOP (derate 8.70mW/°C above +70°C) ........696mW
Operating Temperature Ranges
MAX32_ _C_ _......................................................0°C to +70°C
MAX32_ _E_ _...................................................-40°C to +85°C
Storage Temperature Range ..........................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................+300°C
MAX3221 Features
1A Supply Current Achieved with AutoShutdown
Small 0.1F Capacitors
True RS-232 Operation from VCC = +3.0V to +5.5V
Meets EIA/TIA-562 Specifications Down to 2.7V
Guaranteed 120kbps Data Rate
6V/s Min Guaranteed Slew Rate
Smallest Single-Supply RS-232 Transceiver (MAX3221)
Guaranteed Mouse Driveability (MAX3243)
Small TSSOP Package (MAX3223/MAX3243)
MAX3221 Typical Application
Notebook, Subnotebook, and Palmtop Computers
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Printers
MAX3221 Connection Diagram
