S39421

SUMMIT MICROELECTRONICS, Inc. S39421 Hot Swap Voltage Controller FEATURES Full Voltage Control for Hot Swap Applications – Card Insertion Detection – Platform Voltage Detection – Card Voltage Sequencing – 5 Volt, 12 Volt and 3.3 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] Supports 5 Volt, 3.3 Volt and Mixed Voltage Cards Integrated 1K Bit E2PROM Memory Data Download™ Mode [Simplifies Downloading of Configuration Memory into Interface ASIC or MCU] DESCRIPTION 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” voltages 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 RESET outputs and power-down the add-in card. In addition to the power control for the add-in card, the S39421 provides status signals that can be employed by the host and for the control of bus interface components. The on board E2PROM can be used as configuration memory for the individual card or as general purpose memory. Th...