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+3.0V to +5.5V, 1µA, Up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus

Product Details

Key Features

Parametric specs for RS-232 Line Driver/Receivers
# Rx 3
# Tx 5
VSUPPLY (V) 5
Data Rate (kbps) (min) 250
ICC (mA) (typ) 0.5
Internal Charge Pump Yes
External Caps 4
Cap. Value (µF) (nom) 0.1
Package/Pins SSOP/28
Budgetary
Price (See Notes)
4.58
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Simplified Block Diagram

Technical Docs

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Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Parameters

Parametric specs for RS-232 Line Driver/Receivers
# Rx 3
# Tx 5
VSUPPLY (V) 5
Data Rate (kbps) (min) 250
ICC (mA) (typ) 0.5
Internal Charge Pump Yes
External Caps 4
Cap. Value (µF) (nom) 0.1
Package/Pins SSOP/28
Budgetary
Price (See Notes)
4.58

Key Features

  • 1µA Supply Current Achieved with AutoShutdown Plus
  • Guaranteed Data Rate: 250kbps
  • 1µA Low-Power Shutdown
  • Receivers Active in AutoShutdown Plus Mode
  • Flow-Through Pinout
  • Meets EIA/TIA-232 Specifications Down to 3.0V
  • Guaranteed 6V/µs Slew Rate
  • Auto shutdown reduces supply current to 1uA

Applications/Uses

  • Battery-Powered Applications
  • Handheld Equipment
  • High-Speed Modems
  • Notebook, Subnotebook, and Palmtop Computers
  • Peripherals
  • Printers

Description

The MAX3238 true RS-232 transceiver achieves a 1µA supply current with Maxim's revolutionary AutoShutdown Plus™ feature. When the device does not sense a valid signal transition on either the receiver or transmitter inputs within 30sec, 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 inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input, saving power without changes to the existing BIOS or operating system.

The MAX3238 5-driver/3-receiver complete serial port is a 3V-powered EIA/TIA-232 and V.28/V.24 communications interface intended for notebook or subnotebook 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 250kbps provides compatibility with popular software for communicating with personal computers. The MAX3238 requires only 0.1µF capacitors in 3.3V operation. It is ideal for 3.3V-only systems, mixed 3.3V and 5.0V systems, or 5V-only systems that require true RS-232 performance.

Receiver R1 has an extra, always-active output (in addition to its standard output), which allows external devices, such as a modem, to be monitored without forward biasing the protection diodes in circuitry that may have VCC completely removed.

The MAX3238 is available in a space-saving SSOP package.

Simplified Block Diagram

MAX3238: Typical Operating Circuit MAX3238: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.