Summit Microelectronics, Inc. - Power Management for Communications™

Summit Microelectronics, Inc.

S39421 Hot Swap Voltage Controller
 

Product Numbers

 

  

Download the entire S39421 data sheet in PDF format.
  

Download a partial listing of suitable MOSFETs for use with the SUMMIT S39421 Hot Swap Controller

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Application Aids
Helpful hints and pointers in PDF format.

AA02 Hot Swap Over Current Monitor for use with S39421
AA03 Boosting the output drive of the S39421's RESET signal
AA04 Using the S39421 Hot Swap Controller on a Motherboard
AA05 Using the S39421 in designs without a 12V supply


RELATIVE APPLICATIONS NOTES:

Applications Note 09: - Using the S39421 as the Primary Control Circuit on VME Live Insertion Card
Applications Note 14: - Hot Swap Implementations with the Summit S39421

FEATURES

  • Full Voltage Control for Hot Swap Applications
    • Card Insertion Detection
    • Platform Voltage Detection
    • Card Voltage Sequencing
    • 5 Volt, 12 Volt and 3 Volt
  • 12 Volt FET Enable Outputs
    • Allows use of Low On-resistance N-Channel FETS
  • Card Reset Generation Based on Out of Spec Voltages
    • Host Reset
  • Programmable Slew Rate Control
    • 250V/Sec Default Rate
  • Integrates 1K Bit E2PROM Memory
  • Supports 5 Volt, 3.3 Volt and Mixed Voltage Cards
  • Data Download™ Mode
    • Simplifies Downloading of Configuration Memory into Interface ASIC or MCU

pinout

OVERVIEW

The S39421 is a fully integrated hot swap controller intended for use on add-in cards that may be inserted into or removed from powered-on host platforms. The S39421 performs a variety of tasks starting with the validation of proper card insertion and the presence of "in-spec" volt-ages at the host platform interface.

Once power is switched on, the S39421 continues to monitor the back-end power to the add-in card and the host power supply. If either the 5V or 3.3V supplies drop below Vtrip the S39421 will immediately assert the RE-SET outputs and power-down the add-in card.

The on board E2PROM can be used as configuration memory for the individual card or as general purpose memory. The proprietary DataDownload mode provides a more direct interface to the E2PROM for simplified access by the add-in card’s controller or ASIC.

 

BLOCK DIAGRAM

 

block diagram



ORDERING INFORMATION

ordering info


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