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Analog Devices Inc./Maxim Integrated DS1836DS-20
- Part No.:
- DS1836DS-20
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1836DS-20.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,495
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Product details
Overview
DS1836DS-20 from Maxim Integrated is a 3.3V microprocessor supervisory circuit with dual-supply power switching, non-maskable interrupt (NMI), and precision reset generation. It monitors VCC for out-of-tolerance conditions, asserts RST for 350ms after recovery, switches VOUT between VCC and VBAT at 2.67–2.80V thresholds, and triggers NMI when IN drops below 1.15–1.35V - used in PIC-based embedded systems requiring battery backup and early power-fail warning.
For engineers reviewing the DS1836DS-20 datasheet, DS1836DS-20 pinout, DS1836DS-20 application, or DS1836DS-20 equivalent, key selection criteria include its 2.72V typical VCC trip point, 350ms reset timeout, open-drain NMI with external pull-up, push-pull RST output, and support for 1.2V–5.5V supply range with valid operation down to 1.2V on either input.
Technical Context
The DS1836DS-20 implements a precision bandgap-referenced comparator for VCC monitoring and IN sense input, with hysteresis built into its power-switching thresholds (VCCRTP/VCCFTP). Its reset logic enforces a fixed 350ms minimum active duration post-recovery, independent of VCC slew rate.
It integrates three distinct functions: (1) voltage-monitoring reset generator with temperature-compensated reference, (2) automatic dual-supply selector routing VOUT to the higher of VCC or VBAT, and (3) high-impedance IN-triggered NMI with 1μs propagation delay - all operating across –40°C to +85°C with <55μA quiescent current at 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.67–2.80V (typ. 2.72V); defines exact VCC threshold for RST assertion in 3.3V-mode variants like DS1836DS-20 |
| Reset Timeout | 200–500ms (typ. 350ms); guarantees minimum RST active duration after VCC returns to tolerance |
| IN Trip Voltage | 1.15–1.35V (typ. 1.25V); sets precise NMI trigger level for user-defined power-rail sensing |
| Supply Range | 1.2–5.5V on VCC/VBAT; enables operation during brownout and supports dual-supply fallback |
| Quiescent Current | 30–50μA at 3.6V; ensures ultra-low power consumption in battery-backed standby mode |
| NMI Propagation Delay | 1μs max; delivers sub-microsecond early warning before system power collapse |
| Operating Temp | –40°C to +85°C; qualified for industrial-grade embedded deployment without derating |
Pinout & Package
DS1836DS-20 is available in 8-pin SO (150mil) surface-mount package. Pinout matches DS1836C/D family variants and is fully compatible with 8-pin DIP (300mil) footprint for design flexibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | Primary 3.3V rail monitored for reset; powers internal circuitry when above trip threshold |
| VBAT | Battery backup supply input | Secondary source engaged when VCC falls below 2.60–2.70V; maintains VOUT during main supply loss |
| NC | No-connect terminal | Unbonded pin; must be left floating or tied to GND per layout guidelines |
| VOUT | Switched power output | Delivers regulated power from VCC or VBAT depending on real-time comparison of both supplies |
| GND | Ground reference | Common return path for all analog and digital functions; requires low-impedance PCB connection |
| IN | User-defined sense input | High-impedance comparator input referenced to 1.25V internal bandgap; accepts divided-down system rails |
| NMI | Non-maskable interrupt output | Open-drain signal asserted low on IN trip; requires external 10kΩ pull-up for proper logic level |
| RST | Reset output | Push-pull active-low reset signal with guaranteed 350ms hold time; drives microcontroller reset pin directly |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply power switching | Automatically selects VCC or VBAT for VOUT based on real-time voltage comparison with hysteresis (2.60–2.80V window) |
| Early-warning NMI | 1μs response to IN voltage drop below 1.25V, enabling controlled shutdown before reset activation |
| Guaranteed reset timing | 350ms minimum RST active duration ensures reliable microcontroller initialization regardless of VCC ramp rate |
| Low-voltage operation | Valid function down to 1.2V on either VCC or VBAT, supporting deep brownout detection and battery preservation |
| Temperature-stable reference | On-chip bandgap voltage reference compensates over –40°C to +85°C, maintaining ±5% trip accuracy |
Applications
| PIC Microcontroller Systems | Industrial Data Loggers |
|---|---|
Use Scenario: PIC-based control unit powered by AC adapter with lithium coin-cell backup. IC Role / Device Role / Timing Role: Supervisory IC providing power-fail reset, battery switchover, and NMI-triggered save-to-EEPROM sequence. Use Value: Enables deterministic shutdown and state preservation using DS1836DS-20's 1μs NMI and 350ms RST hold time before VCC collapse. | Use Scenario: Remote environmental sensor node operating on solar-charged battery with intermittent AC maintenance. IC Role / Device Role / Timing Role: Dual-supply manager ensuring continuous VOUT delivery while detecting grid loss via IN-sensed DC bus. Use Value: DS1836DS-20 extends operational uptime by switching to battery at 2.72V and signaling grid failure 100+ ms before reset via NMI. |
| Medical Portable Devices | POS Terminal Power Management |
Use Scenario: Handheld diagnostic tool with primary Li-ion pack and backup supercapacitor. IC Role / Device Role / Timing Role: System supervisor asserting RST only after confirmed VCC dropout and initiating safe state capture via NMI. Use Value: DS1836DS-20's 1.25V IN threshold allows direct sensing of 3.3V rail, triggering NMI before brownout affects ADC accuracy. | Use Scenario: Retail payment terminal with mains power and backup battery, requiring zero-data-loss transaction commit on outage. IC Role / Device Role / Timing Role: Reset and power-switch controller coordinating firmware save routines and seamless VOUT sourcing. Use Value: DS1836DS-20's push-pull RST and 2.72V trip ensure reset timing aligns precisely with battery engagement, preventing partial writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT27D3+ | Fixed 2.7V reset threshold; no NMI output; no power-switching function | Suitable only for basic reset generation - lacks DS1836DS-20's battery switchover and early-warning interrupt | Select when only reset supervision is needed and dual-supply management is handled externally |
| TPS3808G33DBVR | 3.3V fixed threshold; push-pull RST; no VOUT switching or NMI; 200ms min reset timeout | Supports simpler watchdog-free supervision but cannot replace DS1836DS-20's integrated power-path control | Choose for cost-sensitive designs where battery backup and NMI are not required |
Compared with MAX6326UT27D3+ and TPS3808G33DBVR, DS1836DS-20 uniquely combines reset generation, dual-supply switching, and NMI in one 8-pin package - eliminating discrete diodes, comparators, and external logic needed to replicate its full functionality.
Availability
DS1836DS-20 is available at Aetrix Electronics and suitable for PIC microcontroller systems, industrial data loggers, medical portable devices, and POS terminal power management requiring stable component supply and long-term lifecycle support.
Supply support for DS1836DS-20 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, computing, and communications applications.
The DS1836 family targets microprocessor-based systems needing coordinated power monitoring, battery backup, and fail-safe reset - optimized for PIC, 8051, and ARM Cortex-M controllers in space-constrained embedded designs.
FAQ
What is the exact VCC reset threshold for DS1836DS-20?
The DS1836DS-20 has a guaranteed VCC trip point of 2.67V (min), 2.72V (typ), and 2.80V (max) - consistent with DS1836C/D-series 3.3V-mode variants. This threshold determines when RST is asserted during VCC brownout and is temperature-compensated across –40°C to +85°C. The value is factory-trimmed and does not require external calibration. DS1836DS-20's specification ensures reliable reset activation before critical logic voltage margins are violated.
Does DS1836DS-20 support operation below 3.3V?
Yes, DS1836DS-20 operates from 1.2V to 5.5V on both VCC and VBAT inputs, with full functionality maintained down to 1.2V. Its internal bandgap reference and comparator remain accurate across this range, enabling brownout detection and valid RST/NMI outputs even during deep supply sag. This capability is explicitly verified in the datasheet's Recommended Operating Conditions and DC Electrical Characteristics tables for DS1836DS-20.
How is the NMI output of DS1836DS-20 configured?
The NMI output of DS1836DS-20 is an open-drain structure requiring an external pull-up resistor (typically 10kΩ) to VCC or VBAT. It asserts low when the IN pin voltage drops below 1.15–1.35V (typ. 1.25V), delivering a 1μs-max propagation delay for early power-fail warning. DS1836DS-20's NMI remains active until IN rises above the same threshold, providing clean edge-triggered signaling without debouncing circuitry.
Can DS1836DS-20 switch VOUT between VCC and VBAT without external components?
Yes, DS1836DS-20 performs fully autonomous VOUT switching between VCC and VBAT with no external FETs, diodes, or control logic. When VCC falls below 2.60–2.70V (VCCFTP), VOUT transitions to VBAT; when VCC rises above 2.70–2.80V (VCCRTP), VOUT switches back to VCC. This hysteresis prevents oscillation near the threshold and is intrinsic to DS1836DS-20's internal architecture per the datasheet's Power Switch section.
What package options are available for DS1836DS-20?
DS1836DS-20 is offered in 8-pin SO (150mil) surface-mount package, matching the pinout of the 8-pin DIP (300mil) variant for layout compatibility. Both packages share identical electrical specifications and thermal performance. The SO package supports automated assembly and reduced PCB area, while the DIP version aids prototyping and through-hole integration - both are fully interchangeable for DS1836DS-20 per Maxim's packaging documentation.
DS1836DS-20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroManager
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.72V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 200ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS1836DS-20 FAQ
1.How can I place an order for DS1836DS-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1836DS-20 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 DS1836DS-20 reliable?
The price and inventory of DS1836DS-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1836DS-20 is usually 5 days.
3.What payment methods are accepted for DS1836DS-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1836DS-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1836DS-20?
DS1836DS-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1836DS-20 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 DS1836DS-20?
For technical support, including DS1836DS-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1836DS-20 requirements.
6.How does Aetrix verify that DS1836DS-20 is sourced from the original manufacturer or authorized distributors?
All DS1836DS-20 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 DS1836DS-20 meets industry standards.
7.What is the process for return or replacement of DS1836DS-20?
All DS1836DS-20 units undergo pre-shipment inspection (PSI). If there is an issue with DS1836DS-20, 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 DS1836DS-20 part is unused and in its original packaging.
Return procedure for DS1836DS-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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