My Inquiry
My Account
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:4,744
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS1836DS-20+ from Maxim Integrated is a dual-supply microprocessor supervisory IC with integrated power switch, precision voltage monitoring, and non-maskable interrupt (NMI) generation. It monitors VCC for 5V/3.3V systems, asserts reset at 2.67–2.80V trip point, maintains reset for 350ms after recovery, switches VOUT between VCC and VBAT, 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 reset threshold, 350ms reset timeout, push-pull RST output, open-drain NMI with external pull-up, and dual-supply switching behavior specific to DS1836C/D variants.
Technical Context
The DS1836DS-20+ implements a precision bandgap-referenced comparator for VCC monitoring and IN sense input, with hysteresis built into its power-switch thresholds (VCCRTP − VCCFTP ≈ 0.1V). Its reset logic is asynchronous and asserted during power-up, brownout, and transient dips - independent of clock or software.
As a DS1836C/D variant, it operates with 3.3V nominal supply, switches VOUT from VBAT to VCC at 2.80V (rising), and reverts to VBAT at 2.65V (falling); the RST output uses a CMOS push-pull structure enabling valid state down to 0V VCC when externally pulled down, unlike open-drain alternatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.67–2.80V (typ. 2.72V); ensures reliable reset assertion before 3.3V system logic fails |
| Reset Timeout | 200–500ms (typ. 350ms); guarantees MCU initialization completes after power recovery |
| VCC-to-VBAT Switch Point | Falling: 2.60–2.70V (typ. 2.65V); prevents premature battery switchover during brief dips |
| VBAT-to-VCC Switch Point | Rising: 2.70–2.80V (typ. 2.75V); avoids oscillation near threshold with built-in 0.1V hysteresis |
| IN Sense Trip Voltage | 1.15–1.35V (typ. 1.25V); enables customizable early-warning detection via resistor divider |
| Operating Temp Range | −40°C to +85°C; supports industrial-grade embedded deployment without derating |
| Supply Current | 30–50μA at 3.6V; minimizes quiescent load on backup battery during extended hold-up |
Pinout & Package
DS1836DS-20+ is available in 8-pin SOIC (150-mil width) package with gull-wing leads, RoHS-compliant, and rated for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | Primary 3.3V supply rail; monitored for reset and used as VOUT source above 2.75V |
| VBAT | Battery backup input | Secondary supply; powers VOUT when VCC falls below 2.65V, with <0.1μA leakage |
| NC | No-connect terminal | Internally unconnected; must be left floating or tied to GND per layout best practice |
| VOUT | Switched power output | Delivers regulated power from VCC or VBAT - no external regulation needed |
| GND | Ground reference | Common return for all analog and digital circuitry; requires low-impedance PCB plane |
| IN | High-impedance sense input | Monitors external voltage via resistor divider; trips NMI at 1.25V with ±0.1V tolerance |
| NMI | Open-drain non-maskable interrupt | Asserts low on early power loss; requires 10kΩ pull-up to VCC or VOUT for logic-high default |
| RST | CMOS push-pull reset output | Drives active-low reset to MCU; holds valid state even if VCC collapses to 0V with 100kΩ pull-down |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply power switching | Automatically selects VCC or VBAT for VOUT based on real-time voltage comparison - eliminates manual switchover circuitry |
| Precision 1.25V internal reference | Enables accurate, temperature-stable NMI triggering across −40°C to +85°C without external components |
| 350ms programmable reset timeout | Guarantees sufficient time for power stabilization and MCU boot sequence before release |
| Push-pull RST with 0V VCC support | Allows reset assertion integrity even during full main-supply collapse - critical for safe shutdown |
| Low 30–50μA operating current | Extends battery life in always-on backup mode; reduces thermal load in compact enclosures |
Applications
| Industrial PLC Controller | PIC-Based Data Logger |
|---|---|
Use Scenario: Maintains operation during AC mains interruption using supercapacitor or Li-ion backup. IC Role / Device Role / Timing Role: Supervisory IC providing brownout detection, battery switchover, and controlled reset sequencing. Use Value: Prevents data corruption by asserting NMI for graceful firmware save before RST forces hard reset. | Use Scenario: Records sensor readings continuously; retains volatile settings during brief power loss. IC Role / Device Role / Timing Role: Dual-supply manager ensuring uninterrupted VOUT to RTC and SRAM while signaling MCU via NMI. Use Value: Enables deterministic shutdown within 10μs of sensed voltage drop - maximizing retention time. |
| Medical Vital Sign Monitor | Smart Energy Meter |
Use Scenario: Powers real-time clock and memory during line outage; meets IEC 60601-1 hold-up requirements. IC Role / Device Role / Timing Role: System health monitor generating early-warning NMI and fail-safe RST with 350ms timing margin. Use Value: Complies with safety-critical reset timing budgets while reducing BOM count by integrating reference, comparator, and switch. | Use Scenario: Supports metrology SoC during utility voltage sags; logs outage duration and restart events. IC Role / Device Role / Timing Role: Precision voltage supervisor with calibrated trip points aligned to 3.3V rail tolerances. Use Value: Eliminates need for discrete voltage dividers and comparators - improving long-term accuracy and calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326–26D | Fixed 2.63V reset threshold; no power-switching function; only RST output (no NMI or VOUT) | Suitable for basic reset-only use cases without battery backup or early-warning capability | Select when system uses separate battery management and only requires guaranteed reset assertion |
| TPS3808G33 | 3.3V fixed threshold; push-pull RST; no VOUT switching or NMI output; 200ms min reset timeout | Designed for TI ecosystem MCUs; lacks dual-supply interface and sense-input flexibility | Prefer when footprint compatibility with TPS38xx family is required and NMI/VOUT features are unused |
Compared with MAX6326–26D and TPS3808G33, DS1836DS-20+ uniquely integrates power switching, NMI generation, and precise 2.72V reset in one 8-pin SOIC - reducing component count and enabling predictive shutdown, whereas alternatives require external circuitry for equivalent functionality.
Availability
DS1836DS-20+ is available at Aetrix Electronics and suitable for industrial PLC controllers, PIC-based data loggers, medical vital sign monitors, and smart energy meters 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, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The DS1836 MicroManager product line delivers integrated power supervision, battery switchover, and early-warning interrupt functions specifically for resource-constrained microcontroller systems needing high reliability and minimal external components.
FAQ
What is the exact VCC reset threshold voltage for DS1836DS-20+?
The DS1836DS-20+ has a guaranteed VCC reset threshold of 2.67V (min) to 2.80V (max), with a typical value of 2.72V at −40°C to +85°C. This threshold is factory-trimmed and temperature-compensated, making DS1836DS-20+ suitable for 3.3V systems where reliable brownout detection below nominal rail is essential.
Does DS1836DS-20+ support operation with 0V on VCC?
Yes - DS1836DS-20+ features a push-pull RST output that maintains a valid logic state even when VCC collapses to 0V, provided a 100kΩ pull-down resistor is connected from RST to GND. This ensures deterministic reset assertion during complete main-supply failure, a capability confirmed in the DS1836DS-20+ datasheet Figure 5.
How does the NMI function work in DS1836DS-20+?
The NMI output in DS1836DS-20+ is an open-drain signal triggered when the voltage at the IN pin falls below 1.25V (±0.1V). It provides early power-fail warning - typically 1–10μs before RST asserts - allowing firmware to save critical data. DS1836DS-20+ requires a 10kΩ pull-up to VCC or VOUT for proper NMI logic levels.
What is the difference between DS1836DS-20+ and DS1836DS-10+?
DS1836DS-20+ and DS1836DS-10+ are both DS1836C/D variants but differ in VCC reset threshold: DS1836DS-20+ specifies 2.67–2.80V (typ. 2.72V), while DS1836DS-10+ specifies 2.80–2.97V (typ. 2.88V). This allows designers to select tighter or looser brownout margins depending on system noise immunity and supply regulation quality - both share identical pinout, NMI, and power-switch behavior.
Can DS1836DS-20+ be used with 5V systems?
No - DS1836DS-20+ is a DS1836C/D variant optimized for 3.3V operation, with VCC trip points centered at ~2.72V and switching thresholds at 2.65V/2.75V. For 5V systems, DS1836AS-20+ or DS1836BS-20+ (trip ~4.63V) must be used. Using DS1836DS-20+ on 5V violates its recommended operating conditions and will prevent correct reset assertion.
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:
- Bulk
- Product Status:
- Active
- 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.
DS1836DS-20+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
