MAX251:5V, Isolated, RS-232 Driver Receiver

The MAX250 and MAX251 chip set form the heart of a complete, electronically isolated, RS-232 dual transmitter/receiver. By combining many functions on two chips, the cost and complexity required for an isolated digital interface is greatly reduced. Four low cost optocouplers, four capacitors, a diode and a small pot-core type transformer are all that are required to complete a 19.2k baud transceiver. Faster data rates are possible by using high speed optocouplers. In addition to the driving and receiving circuitry for the optocouplers, the chip set includes a push-pull transformer driver to supply power to the interface's isolated side. Other convenient features include single +5V operation, a low power shutdown mode, and output enable control for three-state operation. The MAX250 and MAX251 are supplied in 14 lead DIP, 14 lead small outline and 20 leadless chip carrier packages. The MAX252 has all the required components for RS-232 communication in a single package.

Key Features
  • Isolated Data Interface
  • Single +5V Supply
  • Uses Low Cost Optocouplers
  • 5µW Power Shutdown
  • 2 Transmitters and 2 Receivers
MAX250, MAX251: Pin Configuration
MAX250, MAX251: Pin Configuration
Applications/Uses
  • Bridge Ground Differentials
  • Data Links To Analog Circuits
  • High Noise Data Communications
  • Industrial Communications
DataSheet
titleDownload file
MAX250-MAX251 Data SheetMAX250-MAX251.pdf
Parametrics
Part NumberVSUPPLY
(V)
TxRxData Rate
(kbps)
ICC
(mA)
Internal Charge PumpPackage/PinsBudgetary
Price
mintypSee Notes
MAX2505221160.1YesCDIP(N)/14
PDIP(N)/14
SOIC(N)/14
$4.18 @1k
MAX251CDIP(N)/14
PDIP(N)/14
SOIC(N)/14
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX251C/DNo Longer AvailableDICE SALES,;NA pin;DICE;0°C to +70°CSee data sheet
MAX251CPDNo Longer AvailableMAX251CPD+PDIP(N),;14 pin;158.4 mm²0°C to +70°CNo
MAX251CPD+ActivePDIP(N),;14 pin;158.4 mm²0°C to +70°CLead Free
MAX251CSDNo Longer AvailableMAX251CSD+SOIC(N),;14 pin;54.2 mm²0°C to +70°CNo
MAX251CSD+ActiveSOIC(N),;14 pin;54.2 mm²0°C to +70°CLead Free
MAX251CSD+TActiveSOIC(N),;14 pin;54.2 mm²0°C to +70°CLead Free
MAX251CSD-TNo Longer AvailableMAX251CSD+TN.SO;14 pin0°C to +70°CSee data sheet
MAX251EJDActiveCDIP(N),;14 pin;162.1 mm²-40°C to +85°CNo
MAX251EPDNo Longer AvailableMAX251EPD+PDIP(N),;14 pin;158.4 mm²-40°C to +85°CNo
MAX251EPD+ActivePDIP(N),;14 pin;158.4 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX251ESDNo Longer AvailableMAX251ESD+SOIC(N),;14 pin;54.2 mm²-40°C to +85°CNo
MAX251ESD+ActiveSOIC(N),;14 pin;54.2 mm²-40°C to +85°CLead Free
MAX251ESD+G071No Longer AvailableMAX251ESD+TG071SOIC(N),;14 pin;54.2 mm²-40°C to +85°CLead Free
MAX251ESD+TActiveSOIC(N),;14 pin;54.2 mm²-40°C to +85°CLead Free
MAX251ESD+TG071ActiveSOIC(N),;14 pin;54.2 mm²-40°C to +85°CLead Free
MAX251ESD-C78042No Longer AvailableSOIC(N),;14 pin;54.2 mm²-40°C to +85°CNo
MAX251ESD-TNo Longer AvailableMAX251ESD+TSOIC(N),;14 pin;54.2 mm²-40°C to +85°CNo
MAX250-MAX251.pdf MAX251
MAX251.pdf MAX251
MAX250-MAX251.pdf MAX251