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Analog Devices Inc. ADM1087AKSZ-REEL7
- Part No.:
- ADM1087AKSZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
ADM1087AKSZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,471
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Product details
Overview
ADM1087AKSZ-REEL7 from Analog Devices is a precision power supply sequencer IC with active-low open-drain enable output, 0.6 V input threshold monitoring, capacitor-adjustable delay (35 μs to >2 ms), and high-voltage (up to 22 V) VIN/ENIN tolerance - used in multi-rail systems to enforce safe power-up order between voltage regulators.
For engineers reviewing the ADM1087AKSZ-REEL7 datasheet, ADM1087AKSZ-REEL7 pinout, ADM1087AKSZ-REEL7 application, or ADM1087AKSZ-REEL7 equivalent, key selection criteria include its active-low ENOUT logic, SC70-6 package footprint, −40°C to +125°C operation, 15 μA quiescent current, and compatibility with 0.6 V–22 V monitored rails and external pull-up voltages up to 22 V.
Technical Context
The ADM1087AKSZ-REEL7 implements a comparator-based voltage monitor with hysteresis (15 mV), internal 250 nA CEXT charge current, and AND-gated logic combining VIN status and active-low ENIN control. Its timing behavior is defined by VIN rising above 0.6 V (typ), initiating a programmable delay before asserting ENOUT low.
Unlike ADM1085/ADM1086, ADM1087AKSZ-REEL7 features active-low ENOUT and active-low ENIN, enabling direct interface with regulators requiring inverted enable signaling (e.g., ADP3334 SD pin). The open-drain output supports level-shifting via external pull-up to 22 V, decoupling logic domain from regulator enable voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Threshold (Rising) | 0.6 V (typ) - enables precise monitoring of low-voltage rails such as 1.2 V or 1.8 V supplies using resistor dividers. |
| ENOUT Logic Polarity | Active-low open-drain - requires external pull-up; compatible with 22 V regulator enable inputs (e.g., ADP3334 SD). |
| CEXT Delay Range | 35 μs (min) to >2 ms (with 470 pF) - sets time between VIN crossing threshold and ENOUT assertion. |
| Supply Current | 15 μA (typ) - enables use in always-on, battery-backed sequencing paths without significant power penalty. |
| Operating Temp | −40°C to +125°C - qualified for industrial and automotive under-hood applications requiring extended thermal margin. |
| VIN/ENIN Voltage Range | 0 V to 22 V - allows direct connection to unregulated inputs or high-side enable signals without level-shifting circuitry. |
| Input Hysteresis | 15 mV - prevents chatter during slow-rising/falling supply transitions, ensuring clean enable edge generation. |
Pinout & Package
ADM1087AKSZ-REEL7 is housed in a 6-lead SC70 (KS-6) package, measuring 2.20 mm × 1.35 mm × 0.90 mm, with 0.65 mm lead pitch and JEDEC MO-203-AB compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - ENIN | Active-low enable input | Asserting low enables ENOUT assertion after VIN threshold and delay; tolerates up to 22 V, allowing direct connection to high-voltage rails. |
| 2 - GND | Ground reference | Analog and digital ground shared; must be low-impedance path to minimize threshold error and noise coupling. |
| 3 - VIN | Monitored voltage input | Compares against internal 0.6 V reference; supports 0.6 V–22 V range via resistor divider; 170 μA leakage at 22 V. |
| 4 - ENOUT | Active-low open-drain output | Sinks current when asserted; requires external pull-up to target regulator enable voltage (e.g., 5 V or 12 V); rated to 25 V absolute max. |
| 5 - CEXT | Capacitor-adjustable delay node | 250 nA current charges external capacitor; delay = (C × 4.8×10⁶) + 35 μs; floating CEXT yields 35 μs minimum delay. |
| 6 - VCC | IC supply rail | 2.25 V–3.6 V operation; powers internal comparator, timer, and logic; 10–15 μA typical supply current across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-programmable delay | Enables precise, layout-tolerant sequencing intervals (35 μs–2+ ms) without trimming resistors or firmware. |
| 0.6 V input threshold with hysteresis | Supports accurate monitoring of modern low-voltage rails (1.2 V, 1.8 V) while rejecting noise-induced false triggers. |
| 22 V tolerant VIN/ENIN pins | Eliminates need for external level shifters when interfacing with unregulated or high-side enable signals. |
| Active-low ENOUT + ENIN logic | Directly drives shutdown (SD) inputs of regulators like ADP3334 without inverters or additional logic gates. |
| SC70-6 footprint | Minimizes PCB area in space-constrained portable and networking equipment; compatible with standard reflow profiles. |
Applications
| Desktop/NB Power Sequencing | Routers & Line Cards |
|---|---|
|
Use Scenario: Staggered power-up of CPU core (1.2 V), I/O (1.8 V), memory (2.5 V), and chipset (3.3 V) rails in notebook PCs. IC Role / Device Role / Timing Role: ADM1087AKSZ-REEL7 monitors upstream rail voltage and asserts ENOUT low after programmable delay to enable next-stage regulator. Use Value: Prevents latch-up or inrush current overload by enforcing strict LOFO (last-on, first-off) sequencing without microcontroller intervention. |
Use Scenario: Controlled startup of multiple DC/DC converters powering FPGA banks, PHY interfaces, and management controllers on telecom line cards. IC Role / Device Role / Timing Role: ADM1087AKSZ-REEL7 acts as cascaded sequencer - its ENOUT drives ENIN of downstream ADM1087AKSZ-REEL7 or regulator SD pin. Use Value: Enables deterministic, repeatable power-up across 4+ rails using only passive components (resistors, capacitors), reducing BOM count and firmware dependency. |
| Graphics Card Multi-Rail Control | Industrial Embedded Systems |
|
Use Scenario: Safe ramp-up of GPU core (0.85 V), memory (1.35 V), and auxiliary (3.3 V) supplies in discrete graphics cards. IC Role / Device Role / Timing Role: ADM1087AKSZ-REEL7 monitors 3.3 V auxiliary rail and delays enable signal to GPU core regulator using CEXT = 100 nF (~480 ms). Use Value: Guarantees auxiliary power is stable before enabling high-current GPU core, avoiding brownout-induced reset or configuration loss. |
Use Scenario: Power sequencing in fanless industrial PCs where thermal derating requires reliable cold-start behavior across −40°C to +125°C. IC Role / Device Role / Timing Role: ADM1087AKSZ-REEL7 provides temperature-stable 0.6 V threshold (±30 ppm/°C) and 15 μA supply current for always-on sequencing logic. Use Value: Ensures consistent delay timing and threshold accuracy over full industrial temperature range without calibration or compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power supply sequencing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM1085AKSZ-REEL7 | Active-high ENOUT, same SC70-6 package and timing architecture. | Requires external inverter or regulator with active-high enable; not drop-in for ADP3334 SD pin. | Select when interfacing with regulators that accept active-high enable (e.g., TPS543x series) and no level inversion is needed. |
| TPS3808G33DBVR | Fixed 3.3 V reset threshold, no CEXT delay adjustment; push-pull output; 1.8 V–6.5 V VCC range. | Lacks programmable delay and 22 V input tolerance; suited for simple reset generation, not multi-rail sequencing. | Choose for cost-sensitive, single-threshold power-good monitoring where delay flexibility and high-voltage tolerance are unnecessary. |
Compared with ADM1085AKSZ-REEL7, ADM1087AKSZ-REEL7 eliminates external inversion hardware for active-low regulator enables; compared with TPS3808G33DBVR, it delivers field-programmable delay and wider input voltage support essential for complex multi-supply sequencing.
Availability
ADM1087AKSZ-REEL7 is available at Aetrix Electronics and suitable for desktop/notebook computers, telecom routers, and industrial embedded systems requiring stable component supply, extended temperature operation, and precise power-up timing control.
Supply support for ADM1087AKSZ-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM1087AKSZ-REEL7 belongs to Analog Devices' Simple Sequencers® family - designed specifically for deterministic, capacitor-programmed power supply sequencing in space- and power-constrained multi-rail systems.
FAQ
What is the function of the CEXT pin on the ADM1087AKSZ-REEL7?
The CEXT pin on the ADM1087AKSZ-REEL7 connects to an external capacitor that sets the time delay between VIN crossing the 0.6 V threshold and ENOUT assertion. A 250 nA internal current source charges the capacitor; delay = (C × 4.8×10⁶) + 35 μs. With CEXT = 470 pF, ADM1087AKSZ-REEL7 achieves ~2.2 ms delay, enabling precise sequencing intervals without software or trimming.
Can ADM1087AKSZ-REEL7 monitor a 1.2 V supply directly?
Yes - ADM1087AKSZ-REEL7 monitors a 1.2 V supply by connecting it to VIN through a 2:1 resistor divider (e.g., 100 kΩ + 100 kΩ), scaling the voltage to 0.6 V at the input. The device's 0.6 V internal reference, ±40 mV tolerance, and 15 mV hysteresis ensure robust detection even with supply ripple or temperature drift. No external reference is required.
What is the maximum voltage allowed on the ENOUT pin of ADM1087AKSZ-REEL7?
The ENOUT pin of ADM1087AKSZ-REEL7 is rated for up to 25 V absolute maximum (per Absolute Maximum Ratings table), and its open-drain structure allows safe pull-up to voltages as high as 22 V. This enables direct interface with high-voltage regulator enable inputs (e.g., ADP3334 SD pin) without level-shifting components - a key design advantage over fixed-threshold supervisors.
How does ADM1087AKSZ-REEL7 differ from ADM1086AKSZ-REEL7 in output stage?
ADM1087AKSZ-REEL7 uses an active-low open-drain ENOUT requiring an external pull-up resistor, while ADM1086AKSZ-REEL7 has a push-pull (CMOS) output that drives high/low actively. ADM1087AKSZ-REEL7's open-drain supports level-shifting to 22 V, whereas ADM1086AKSZ-REEL7's push-pull is limited to VCC (≤3.6 V). This makes ADM1087AKSZ-REEL7 ideal for driving high-voltage regulator shutdown pins.
Is ADM1087AKSZ-REEL7 suitable for automotive applications?
Yes - ADM1087AKSZ-REEL7 is specified from −40°C to +125°C, meets AEC-Q100 stress test requirements per Analog Devices' qualification program, and features low 15 μA supply current and 22 V input tolerance - all critical for under-hood and infotainment power sequencing. Its SC70-6 package supports automated assembly in automotive-grade PCBs.
ADM1087AKSZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Simple Sequencers®
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Sequencer
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
ADM1087AKSZ-REEL7 FAQ
1.How can I place an order for ADM1087AKSZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1087AKSZ-REEL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADM1087AKSZ-REEL7 reliable?
The price and inventory of ADM1087AKSZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1087AKSZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM1087AKSZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1087AKSZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1087AKSZ-REEL7?
ADM1087AKSZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1087AKSZ-REEL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADM1087AKSZ-REEL7?
For technical support, including ADM1087AKSZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1087AKSZ-REEL7 requirements.
6.How does Aetrix verify that ADM1087AKSZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM1087AKSZ-REEL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADM1087AKSZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM1087AKSZ-REEL7?
All ADM1087AKSZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1087AKSZ-REEL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADM1087AKSZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM1087AKSZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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