MAX3227 General Description
The MAX3224MAX3227/MAX3244/MAX3245 are 3V- powered EIA/TIA-232 and V.28/V.24 communications interfaces with automatic shutdown/wakeup features and high data-rate capabilities.
All devices achieve a 1µA supply current using Maxim's revolutionary AutoShutdown Plus™ feature. These devices automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive, and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiver input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system.
The MAX3225/MAX3227/MAX3245 also feature MegaBaud™ operation, guaranteeing 1Mbps for high-speed applicat ions such as communicating with ISDN modems. The MAX3224/MAX3226/MAX3244 guarantee 250kbps operation. The transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a 3.3V supply. The MAX3224MAX3227 feature a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting.
All devices are available in a space-saving SSOP pack-age.
MAX3227 Maximum Ratings
VCC to GND..............................................................-0.3V to +6V
V+ to GND (Note 1) ..................................................-0.3V to +7V
V- to GND (Note 1) ...................................................+0.3V to -7V
V+ +V-(Note 1) ..............................................................+13V
Input Voltages
T_IN, FORCEON, FORCEOFF to GND.......................... -0.3V to +6V
R_IN to GND ........................................................................±25V
Output Voltages
T_OUT to GND..................................................................±13.2V
R_OUT, INVALID, READY to GND ................-0.3V to (VCC + 0.3V)
Short-Circuit Duration
T_OUT to GND.............................................................Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C) ............571mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) .............640mW
28-Pin Wide SO (derate 12.5mW/°C above +70°C)............... 1W
28-Pin SSOP (derate 9.52mW/°C above +70°C) .............762mW
Operating Temperature Ranges
MAX32_ _C_ _........................................................0°C to +70°C
MAX32_ _E_ _......................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ................................+300°C
MAX3227 Features
* 1µA Supply Current
*AutoShutdown Plus-EDN Innovation of the Year
*Guaranteed Data Rate:
250kbps (MAX3224/3226/3244)
1Mbps (MAX3225/3227/3245)
* Guaranteed Slew Rate:
6V/µs (MAX3224/3226/3244)
24V/µs (MAX3225/3227/3245)
* Meets EIA/TIA-232 Specifications Down to 3.0V
*Guaranteed Mouse Driveability (MAX3244/3245)
* Ready-to-Transmit Logic-Level Output
MAX3227 Typical Application
*Notebook, Subnotebook, and Palmtop Computers
*Cellular Phones
*Battery-Powered Equipment
*Hand-Held Equipment
*Peripherals
*Printers
MAX3227 Connection Diagram
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