- Adjustable Delay to Subsequent Enable Signal
- Adjustable Delay to Sequence Auto Start
- Adjustable Distributed Voltage Monitoring
- Under and Overvoltage Adjustable Delay to Auto Start Sequence
- I/O Options
- ENABLE (ISL8700A, ISL8702A, ISL8704A) and
- ENABLE# (ISL8701A, ISL8703A, ISL8705A)
- SEQ_EN (ISL8702A, ISL8703A) and
- SEQ_EN# (ISL8704A, ISL8705A)
- Voltage Compliance Fault Output
- Pb-Free (RoHS Compliant)
The ISL8700A, ISL8701A, ISL8702A, ISL8703A, ISL8704A, ISL8705A family of ICs provide four delay adjustable sequenced outputs while monitoring an input voltage all with a minimum of external components.
High performance DSP, FPGA, µP and various subsystems require input power sequencing for proper functionality at initial power-up and the ISL870XA provides this function while monitoring the distributed voltage for over and undervoltage compliance.
These ICs operate over the +3.3V to +24V nominal voltage range. All have a user adjustable time from UV and OV voltage compliance to sequencing start via an external capacitor when in auto start mode and adjustable time delay to subsequent ENABLE output signal via external resistors.
Additionally, the ISL8702A, ISL8703A, ISL8704A and ISL8705A provide I/O for sequencing on and off operation (SEQ_EN) and for voltage window compliance reporting (FAULT) over the +3.3V to +24V nominal voltage range.
Easily daisy chained for more than 4 sequenced signals.Altogether, the ISL870XA provides these adjustable features with a minimum of external BOM.
- Power Supply Sequencing
- System Timing Function
|VBIAS (min)||3.3 V||3.3 V||2.5 V||2.5 V|
|VBIAS (max)||24 V||24 V||12 V||5.5 V|
|Sequenced Voltages (min)||3.3 V||3.3 V||2.5 V||0.7 V|
|Sequenced Voltages (max)||24 V||24 V||12 V||5.5 V|
|Enable||Active Low||Active Low||Active High||Active High|
|Sequenced Output Control||Active High, Open Drain||Active Low, Open Drain||Active High, Open Drain||Charge Pumped 10μA FET Drive|
|Initial Startup Requirements||UV/OV & EN||UV/OV & EN||UV/OV & EN||4 UVLO 1EN|
|# of Channels that Turn Off When VIN is non-compliant||4 Simultaneous||4 Simultaneous||4 Simultaneous||4 Gates|
|Preset Or Adjustable Sequence||Preset Order, Adjustable Delay||Preset Order, Adjustable Delay||Preset Order, Adjustable Delay||Adjustable ON & OFF Delay|
|Features||Fault Reporting||Fault Reporting||Fault Reporting||Auto Restart, Low bias current sleep|
|Power Down Sequencing||Yes||Yes||Yes||Yes|
|ISL8700A, ISL8701A, ISL8702A, ISL87003A, ISL87004A, ISL87005A Datasheet|
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