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MAX3238
+3.0V to +5.5V, 1µA, Up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus
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Status
Active: In Production.
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.
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Data Sheet
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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
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Applications/Uses
- Battery-Powered Applications
- Handheld Equipment
- High-Speed Modems
- Notebook, Subnotebook, and Palmtop Computers
- Peripherals
- Printers
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Key Specifications:
| RS-232 Line Driver/Receivers |
| Part Number |
VSUPPLY
(V) |
Tx |
Rx |
Data Rate
(kbps) |
ICC
(mA) |
Internal Charge Pump |
Ext. Caps |
Cap. Value
(µF) |
Rx Active in Shutdn |
Package/Pins |
Budgetary Price |
| min |
typ |
nom |
See Notes |
| MAX3238 |
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5 |
3 |
250 |
0.5 |
Yes |
4 |
0.1 |
0 |
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$3.39 @1k |
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See All RS-232 Line Driver/Receivers (152)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX3238CAI
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-1*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX3238CAI+
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+1*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX3238CAI+T
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+1*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX3238CAI-T
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Active |
SSOP;28 pin
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| MAX3238EAI
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX3238EAI+
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX3238EAI+T
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX3238EAI-T
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Active |
SSOP;28 pin;81.6 mm²
Outline Drawing:21-0056 (PDF)
Land Pattern: 90-0095 (PDF)
Use pkgcode/variation: A28-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Similar Products by Function
Products with Similar Part Numbers
| MAX3238E, MAX3248E |
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins |
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1144
Rev 1;
2002-11-04
This page last modified: 2010-05-06
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