Overview
Description
The ISL70321SEH and ISL73321SEH are radiation hardened and SEE mitigated power supply sequencers designed to drive Point-of-Load (POL) regulators with enable pins. Up to four power supplies can be fully sequenced by a single device or multiple devices can be easily cascaded to sequence an unlimited number of power supplies for dense RF applications. This power supply sequencer requires only two feedback resistors per power supply and a single resistor to set the rising and falling delay. The device features precision input comparators with an input threshold voltage of 600mV ±1.5% for the highest possible accuracy when monitoring the power supply voltages. The ISL70321SEH and ISL73321SEH are offered in an 18 Ld 10mm x 12mm CDFP package or die form and are fully specified across the military ambient temperature range of -55 °C to +125 °C. With minimal external component count, precision voltage monitoring, and SET mitigation, the ISL70321SEH and ISL73321SEH are the ideal choice to control many of today’s highly dense power systems in high-reliability applications.
Features
- Wide operating voltage range, 3V to 13.2V
- Single resistor sets the rising and falling delay
- Power-off POLs in reverse order or simultaneously
- Precision voltage monitoring
- 600mV ±1.5% threshold voltage over temperature and radiation
- Full military temperature range operation
- TA = -55 °C to +125 °C
- TJ = -55 °C to +150 °C
- Radiation hardness
- High dose rate (HDR) (50-300rad(Si)/s): 100krad(Si) - ISL70321SEH only
- Low dose rate (LDR) (0.01rad(Si)/s): 75krad(Si) ISL70321SEH and ISL73321SEH
- SEE hardness (Review SEE report for details)
- No SEB/SEL LETTH, VDD = 14.7V: 86MeV•cm2/mg
- SET, SEFI free at LET 20MeV•cm2/mg
- Electrically screened to DLA SMD 5962-17225
Comparison
Applications
Design & Development
Software & Tools
Software & Tools
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Software type
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Company
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| iSim:PE Offline Simulation Tool iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.
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Simulator | Renesas |
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Boards & Kits
Demonstration
ISL70321SEHDEMO1Z
Active
Radiation Hardened Quad Power Supply Sequencer Demonstration Board
The ISL70321SEHDEMO1Z is a small form factor (SFF) board suitable for integrating onto an existing circuit board or onto a prototype system circuit. The demonstration board provides up to four sequencing events for point-of-load (POL) regulators powering multi-rail loads.
The...
Recommended Documents:
Evaluation
ISL70321SEHEV1Z
Active
Radiation Hardened Quad Power Supply Sequencer Evaluation Board
The ISL70321SEH evaluation boards highlight an innovative turn-on and turn-off sequencer solution for multi-voltage space-based applications using point-of-load (POL) DC/DC voltage converters. The ISL70321SEHEV1Z platform provides a single IC 4-event evaluation platform, whereas the...
Recommended Documents:
Evaluation
ISL70321SEHEV2Z
Active
Radiation Hardened Quad Power Supply Sequencer Evaluation Board
The ISL70321SEH evaluation boards highlight an innovative turn-on and turn-off sequencer solution for multi-voltage space-based applications using point-of-load (POL) DC/DC voltage converters. The ISL70321SEHEV1Z platform provides a single IC 4-event evaluation platform, whereas the...
Recommended Documents:
Reference Designs
Renesas Radiation Hardened Power Solution for RTG4 FPGA
Over the last decade, satellites and spacecraft have seen an exponential increase in the need for onboard data processing and storage demands. Additionally, major satellite manufacturers have recently announced their latest satellites to be modular, fully digital, and capable of in-orbit...
Reference Designs
Renesas Rad Hard Power Management Reference Design for AMD's Space Grade XQRKU060
Over the last decade, satellites and spacecraft have seen an exponential increase in the need for onboard data processing and storage demands. Additionally, major satellite manufacturers have recently announced their latest satellites to be modular, fully digital, and capable of in-orbit...
Demonstration
ISLVERSALDEMO2Z
Active
Power Management Reference Design for AMD Versal XQRVC1902
The ISLVERSALDEMO2Z demo board provides the power management for the AMD Xilinx Space Grade Versal ACAP AI Core VC1902 using Renesas' Radiation Hardened Power Management devices. The Versal ACAP system requires various supply rails, including the core, digital, analog, and DDR memory. The...
Recommended Documents:
Reference Designs
Power Management Reference Design for Microchip RT PolarFire FPGA Family
The ISLRTPFDEMO1Z is a comprehensive power management reference design tailored to meet the needs of the Microchip radiation tolerant (RT) PolarFire® SoC FPGA family. The PolarFire SoC system requires various supply rails, each with its own specific DC and AC regulation tolerances and...
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
Models
| Model - SPICE | ZIP 111 KB | |
| Model - iSim | SXSCH 296 KB | |
| Model - iSim | SXSCH 231 KB | |
| Model - iSim | SXSCH 220 KB | |
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Product Options
Applied Filters:
Support
Support Communities
Get quick technical support online from Renesas Engineering Community technical staff.
Support Communities
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[RH850/F1KM]External voltage monitoring
Hello team In order to implement external voltage monitoring mentioned in the Safety Application Note, is there any recommended chip from Renesas? BR. Xianti
Mar 4, 2025
FAQs
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How many ISL70321SEH or ISL73321SEH devices can I sequence?
Question: How many devices can I sequence? Answer: You can sequence an unlimited of devices together. Please note to ensure proper communication from IC to IC the pcb stray capacitance should be kept below 100pF on the UP, INIT and DONE pins. Please refer to the datasheet for more information ...
Jan 1, 1970 -
Can the ISL70321SEH or ISL73321SEH rising and falling delay be programmed differently?
Question: Can the rising and falling delay be programmed differently? Answer: Unfortunately, the rising and falling delay are programmed equally using a resistor from TDLY pin to ground.
Jan 1, 1970 -
Can the ISL70321SEH or ISL73321SEH EN output pull-up resistors be connected to VCC5?
Question: Can the EN output pull-up resistors be connected to VCC5? Answer: Yes, VCC5 can support up to 50mA of output current. You can use this pin to connect the pull-up resistors from the EN outputs or use even to bias other loads in your system.
Jan 1, 1970