MAX3227IDBRG4.A中文资料德州仪器数据手册PDF规格书

FEATURES

Meets or Exceeds the Requirements of

TIA/EIA-232-F and ITU v.28 Standards

Operates With 3-V to 5.5-V VCC Supply

Operates at Least 1 Mbit/s

Low Standby Current . . . 1 mA Typ

External Capacitors . . . 4 ´ 0.1 mF

Accepts 5-V Logic Input With 3.3-V Supply

Designed to Be Interchangeable With Maxim™

MAX3227

Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

ESD Protection for RS-232 I/O Pins

– ±15 kV – Human-Body Model

– ±8 kV – IEC61000-4-2, Contact Discharge

– ±8 kV – IEC61000-4-2, Air-Gap Discharge

Auto-Powerdown Plus Feature Automatically

Disables Drivers for Power Savings

Packaged in Plastic Shrink Small-Outline

Package

APPLICATIONS

Battery-Powered, Hand-Held, and Portable

Equipment

PDAs and Palmtop PCs

Notebooks, Sub-Notebooks, and Laptops

Digital Cameras

Mobile Phones and Wireless Devices

DESCRIPTION/ORDERING INFORMATION

The MAX3227 consists of one line driver, one line receiver, and a dual charge-pump circuit with ±15-kV ESD

protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of

TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the

serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to

5.5-V supply. This device operates at data-signaling rates of 1 Mbit/s in normal operating mode and a maximum

of 30-V/ms driver output slew rate. This device also features a logic-level output (READY) that asserts when the

charge pump is regulating and the device is ready to begin transmitting.

The MAX3227 achieves a 1-mA supply current using the auto-powerdown plus feature. This device automatically

enters a low-power powerdown mode when the RS-232 cable is disconnected or the drivers of the connected

peripherals are inactive for more than 30 s. They turn on again when they sense a valid transition at any driver or

receiver input. Auto-powerdown saves power without changes to the existing BIOS or operating system.

The MAX3227C is characterized for operation from 0°C to 70°C. The MAX3227I is characterized for operation

from –40°C to 85°C.