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S39421 Datasheet

  • S39421

  • Hot Swap Voltage Controller

  • 28頁

  • ETC

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SUMMIT
MICROELECTRONICS, Inc.
S39421
Hot Swap Voltage Controller
FEATURES
鈥?Full Voltage Control for Hot Swap Applications
鈥?Card Insertion Detection
鈥?Platform Voltage Detection
鈥?Card Voltage Sequencing
鈥?5 Volt, 12 Volt and 3.3 Volt
鈥?12 Volt FET Enable Outputs
鈥?Allows use of Low On-resistance N-Channel
FETS
鈥?Card Reset Generation Based on Out of Spec
Voltages
鈥?Host Reset
鈥?Programmable Slew Rate Control [250V/Sec
Default Rate]
鈥?Supports 5 Volt, 3.3 Volt and Mixed Voltage
Cards
鈥?Integrated 1K Bit E
2
PROM Memory
鈥?Data Download鈩?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 鈥渋n-spec鈥?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.
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 E
2
PROM 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 E
2
PROM for simplified
access by the add-in card鈥檚 controller or ASIC.
FUNCTIONAL BLOCK DIAGRAM
W
R
_P
EL
ST
VS
H
ST
H
_R
ST
VCC5
EEPROM
Memory
Array
+
VCC3
-
+
CARD_5V
-
+
CARD_3V
-
+
-
Filter
PND1
DD
DO
CS
SK
DI
DRVREN
SGNL_VLD
CARD_V_VLD
ASSOCIATE
MEMBER
Sequencing
Logic
RESET
Timer
RESET
RESET
PND2
ISLEW
Slew Rate
Control
VGATE3
VGATE5
12
SUMMIT MICROELECTRONICS, Inc.
鈥?/div>
300 Orchard City Drive, Suite 131
鈥?/div>
Campbell, CA 95008
VC
C
2024 ILL2.1
鈥?/div>
Telephone 408-378-6461
鈥?/div>
Fax 408-378-6586
鈥?/div>
www.summitmicro.com
漏 SUMMIT MICROELECTRONICS, Inc. 1999
2024 9.0 8/8/00
1
Characteristics subject to change without notice

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