Overview
Description
The Intersil ISL8723 and ISL8724 are 4 channel sequencers controlling the on and off sequence of voltages with undervoltage supply fault protection and a sequence completed signal (RESET). For larger systems, more than 4 voltages can be sequenced by a simple connection of multiple IC's. These sequencers use an integrated charge pump to drive 4 external low-cost N-channel MOSFET switch gates above the IC bias voltage by 5. 3V. These IC's can be biased from and control any supply from 2. 5V to 5V and additionally monitor any voltage above 0. 7V. Individual product descriptions follow. The four channel ISL8723 (ENABLE input), ISL8724 (ENABLE input) offer the designer 4 voltage control when it is required that all four rails are in minimal compliance prior to turn on and that compliance must be maintained during operation. The ISL8723 has a low power standby mode when it is disabled suitable for battery powered applications. External resistors provide flexible voltage threshold programming of monitored voltages. Delay and sequencing timing are programmable by external capacitors for both ramp up and ramp down.
Features
- Enables arbitrary turn-on and turn-off sequencing of up to four power supplies (0.7V to 5V)
- Operates from 2.5V to 5V supply voltage
- Supplies VDD +5.3V of charge pumped gate drive
- Adjustable voltage slew rate for each rail
- Multiple sequencers can be easily daisy-chained to sequence an infinite number of independent voltages
- Glitch immunity
- Undervoltage lockout for each monitored supply voltage
- 30µA Sleep State (ISL8723)
- Active high (ISL8723) or low (ISL8724) ENABLE input
- Pb-free (RoHS compliant)
Comparison
Applications
- Graphics cards
- FPGA/ASIC/microprocessor/PowerPC supply sequencing
- Network Routers
- Telecommunications Systems
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 713 KB | |
| Price Increase Notice | PDF 208 KB | |
| White Paper | PDF 295 KB | |
| Product Change Notice | PDF 223 KB | |
| Product Change Notice | PDF 106 KB | |
| Product Change Notice | PDF 173 KB | |
| Application Note | PDF 509 KB | |
| Application Note | PDF 397 KB | |
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Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| QFN | Tube | 750 | ||
| QFN | Reel | 6000 |
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