MAX13451E:RS-485 Transceivers with Integrated 100Ω/120Ω Termination Resistors

Software/Pin-Selectable Termination Eliminates the Need for External Resistors and DIP Switches

The MAX13450E/MAX13451E are half-duplex and full-duplex RS-485/RS-422 transceivers. These devices feature internal 100Ω and 120Ω termination resistors. The resistor values are pin selectable. A logic supply input allows interfacing to logic levels down to +1.8V. The MAX13450E/MAX13451E feature strong drivers specified to drive low-impedance lines found when a fully loaded bus, based on today's 100Ω characteristic impedance cable, is doubly terminated. Both devices allow slew-rate limiting of the driver output to reduce EMI and reflections for data rates up to 500kbps. The MAX13451E has a FAULT alarm indication output to signal to the system that an error condition exists in the driver. The MAX13451E also features a logic inversion function. The logic inversion allows phase reversal of the A-B signals in case these are inadvertently connected wrongly. The MAX13450E/MAX13451E have 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. All driver outputs are protected to ±30kV ESD using the Human Body Model (HBM). The MAX13450E/MAX13451E are available in a 14-pin TSSOP package and operate over the automotive -40°C to +125°C temperature range.

Key Features
  • Easy Configuration of RS-422 and RS-485 Networks Up to 20Mbps (max) Data Rate
    • Software/Pin-Selectable 100Ω/120Ω Termination
    • Integrated, Switchable Resistors Eliminate the Need for External Resistors or DIP Switches
    • Driver Drives 100Ω Double Termination and Supports Cat-5/Cat-6 and 24-AWG Cables
    • Pin-Selectable Slew-Rate Limiting Reduces EMI for Data Rates Up to 500kbps
    • 1/8 Unit Load Allows Up to 256 Transceivers On the Bus
  • Designed to Perform in Harsh Environments
    • Extended ESD Protection
      • ±30kV Human Body Model
      • ±15kV Air Gap Discharge per IEC 61000-4-2
      • ±7kV Contact Discharge per IEC 61000-4-2
    • Inverting of A, B Line Polarity (MAX13451E) Allows Phase Reversal if Misconnected
    • Thermal and Overcurrent Protection
    • Driver Fault Indication (MAX13451E)
    • Fail-Safe Receivers
    • -40°C to +125°C Temperature Range
    • +4.5V to +5.5V Supply Voltage Range
  • Integrated Low-Voltage Logic Interface (Down to 1.8V) Interfaces with Small-Geometry ASICs and FPGA
MAX13450E, MAX13451E: Functional Diagram (MAX13451E)
MAX13450E, MAX13451E: Functional Diagram (MAX13451E)
Applications/Uses
  • Industrial Control Systems
  • Medical Networks
  • Motor Control
  • Portable Industrial Equipment
  • Security Networks
DataSheet
titleDownload file
MAX13450E-MAX13451E Data SheetMAX13450E-MAX13451E.pdf
Parametrics
Part NumberTx/RxDuplexVSUPPLY
(V)
ICC
(mA)
Data Rate
(kbps)
ESD Protect.
(±kV)
Tx ENRx ENICC (Shutdn.)
(µA)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
(°C)
Package/PinsBudgetary
Price
typmintypSee Notes
MAX13450E1Tx + 1RxHalf/Full5-2000030YesYes6256Open or ShortedYes-40 to +125TSSOP-EP/14$1.96 @1k
MAX13451EHalf630OpenTSSOP-EP/14$2.09 @1k
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX13451EAUD+ActiveTSSOP-EP,;14 pin;33.2 mm²-40°C to +125°CLead Free
MAX13451EAUD+TActiveTSSOP-EP,;14 pin;33.2 mm²-40°C to +125°CLead Free
MAX13450E-MAX13451E.pdf MAX13451E
MAX13450E-MAX13451E.pdf MAX13450E