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Analog Devices Inc./Maxim Integrated DS1836DS-20+T&R
- Part No.:
- DS1836DS-20+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1836DS-20+T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,578
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Product details
Overview
DS1836DS-20+T&R from Maxim Integrated is a 3.3V microprocessor supervisory circuit with dual-supply power switching, NMI generation, and precision reset timing. It monitors VCC for out-of-tolerance conditions, switches VOUT between VCC and VBAT at 2.67–2.80V (falling) and 2.70–2.80V (rising), asserts RST for 200–500ms, and triggers NMI when IN drops below 1.15–1.35V - used in battery-backed PIC-based embedded systems requiring fail-safe power management.
For engineers reviewing the DS1836DS-20+T&R datasheet, DS1836DS-20+T&R pinout, DS1836DS-20+T&R application, or DS1836DS-20+T&R equivalent, key selection criteria include its 2.72V typical VCC trip point, 350ms reset timeout, open-drain NMI with 1μs response, push-pull RST output, and SO-8 package compatibility with industrial temperature range operation.
Technical Context
The DS1836DS-20+T&R implements a precision bandgap-referenced voltage comparator for VCC monitoring and an independent high-impedance sense input (IN) referenced to 1.25V. Its reset logic asserts RST during power-up, brownout, and transient dips, holding active for 350ms after VCC recovery.
It integrates a bidirectional power switch that routes VOUT from VBAT to VCC when VCC rises above 2.75V (typ), and back to VBAT when VCC falls below 2.65V (typ); the DS-20 variant is specifically calibrated for 3.3V systems with tighter trip tolerances than DS-10 or DS-05 versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point (DS-20) | 2.67–2.80V; defines exact brownout threshold for 3.3V supply monitoring |
| Reset Timeout | 200–500ms; ensures stable MCU initialization after power recovery |
| NMI Trip Voltage | 1.15–1.35V on IN pin; enables early warning of upstream supply collapse |
| Power Switch Thresholds | VCC→VBAT: 2.60–2.70V; VBAT→VCC: 2.70–2.80V; hysteresis prevents chatter during transitions |
| Operating Temp Range | −40°C to +85°C; supports industrial-grade embedded deployment |
| Supply Current | 30–50μA at 3.6V; enables ultra-low-power backup operation |
| Output Type | Push-pull RST, open-drain NMI; eliminates external pull-ups for RST, requires 10kΩ for NMI |
Pinout & Package
DS1836DS-20+T&R is supplied in an 8-pin SOIC (150-mil) surface-mount package with standard JEDEC MS-012AC footprint and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | Monitored 3.3V rail; trip point set to 2.67–2.80V for DS-20 variant |
| VBAT | Battery backup supply input | Provides hold-up power when VCC fails; leakage <0.1μA in off state |
| NC | No-connect terminal | Not internally bonded; must be left unconnected per datasheet |
| VOUT | Switched power output | Delivers regulated power from VCC or VBAT depending on real-time thresholds |
| GND | Ground reference | Common return for all analog and digital functions; decoupling required near pin |
| IN | External sense input | High-impedance comparator input; trips NMI when voltage falls below 1.25V |
| NMI | Non-maskable interrupt output | Open-drain signal requiring external 10kΩ pull-up; alerts CPU before reset assertion |
| RST | Reset output | Push-pull active-low reset; drives valid logic levels even down to 0V VCC |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply power switching | Automatically selects VCC or VBAT for VOUT based on calibrated 2.65V/2.75V thresholds - eliminates manual switchover circuitry |
| Early-warning NMI generation | 1μs response from IN voltage drop to NMI assertion - provides critical time margin for controlled shutdown before reset |
| Reset with guaranteed timing | 350ms minimum RST assertion after VCC recovery - meets PIC and other MCU power-on reset requirements |
| Zero-VCC RST validity | Push-pull RST maintains valid logic state even when VCC = 0V - enables safe shutdown sequencing with external pull-down |
| Temperature-compensated reference | Bandgap-derived 1.25V reference stable over −40°C to +85°C - ensures consistent trip points across operating range |
Applications
| Battery-Backed Microcontroller Systems | Industrial Power Monitoring |
|---|---|
Use Scenario: PIC-based data logger with SRAM retention during AC mains failure. IC Role / Device Role / Timing Role: Supervisory controller providing brownout detection, battery switchover, and timed reset. Use Value: Guarantees 350ms reset hold time and 1.25V NMI trigger to save volatile state before power loss. | Use Scenario: Programmable logic controller (PLC) monitoring 3.3V I/O rail stability. IC Role / Device Role / Timing Role: Precision voltage supervisor with hysteresis and early-interrupt capability. Use Value: Detects marginal supply degradation at 2.72V (typ) and signals NMI 1μs before RST activation. |
| Medical Diagnostic Equipment | Point-of-Sale Terminal Backup |
Use Scenario: Portable ultrasound device requiring deterministic shutdown on battery depletion. IC Role / Device Role / Timing Role: Dual-rail monitor managing main supply and Li-ion backup path. Use Value: Switches VOUT from VCC to VBAT at 2.65V (min), sustaining operation while initiating graceful firmware shutdown. | Use Scenario: Retail terminal with EEPROM write protection during power interruption. IC Role / Device Role / Timing Role: Reset generator with NMI alert for last-chance data commit. Use Value: Delivers 350ms RST window and 1.25V-triggered NMI to complete flash writes before supply collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT27D3+T | Fixed 2.7V reset threshold; no power-switching or NMI functionality | Suitable only for basic reset generation - lacks battery switchover and early-warning interrupt | Select when only reset supervision is needed and dual-supply management is handled externally |
| TPS3808G125DBVR | 2.5V fixed threshold; push-pull reset; no NMI or VOUT switching | Designed for low-IQ (1.1μA) but omits power-path control and interrupt signaling | Prefer for ultra-low-power always-on monitoring where battery backup and NMI are unnecessary |
Compared with MAX6326UT27D3+T and TPS3808G125DBVR, DS1836DS-20+T&R uniquely integrates power switching, NMI generation, and programmable 3.3V reset thresholds in one SO-8 package - enabling compact, self-contained fail-safe supervision without external MOSFETs or comparators.
Availability
DS1836DS-20+T&R is available at Aetrix Electronics and suitable for battery-backed microcontrollers, industrial PLCs, medical diagnostics equipment, and point-of-sale terminals requiring stable component supply across extended production lifecycles.
Supply support for DS1836DS-20+T&R 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, automotive, and computing applications.
The DS1836 family delivers integrated power supervision, battery switchover, and early-warning interrupt for microprocessor-based systems operating from dual supplies - targeting reliability-critical embedded platforms.
FAQ
What is the exact VCC reset threshold for DS1836DS-20+T&R?
The DS1836DS-20+T&R has a guaranteed VCC trip point of 2.67V (min), 2.72V (typ), and 2.80V (max) - calibrated specifically for 3.3V systems and distinct from DS-10 (2.88V typ) or DS-05 (4.37V typ) variants. This threshold determines when RST activates during brownout and is factory-trimmed for accuracy across temperature.
Does DS1836DS-20+T&R support zero-voltage RST output validity?
Yes, DS1836DS-20+T&R features a push-pull RST output that maintains valid logic states even when VCC drops to 0V - achieved by internal circuitry sourcing/sinking current independently of VCC. A 100kΩ pull-down resistor on RST ensures reliable low-state assertion during full power loss, enabling safe system shutdown sequencing.
How does the NMI function work in DS1836DS-20+T&R?
The NMI output in DS1836DS-20+T&R is triggered when the voltage at the IN pin falls below 1.25V (1.15–1.35V range), using an internal bandgap reference. It responds within 1μs and is open-drain, requiring an external 10kΩ pull-up. This provides early warning of upstream supply collapse before RST activates, giving firmware time to save state.
What is the power-switching behavior of DS1836DS-20+T&R between VCC and VBAT?
DS1836DS-20+T&R switches VOUT from VBAT to VCC when VCC rises above 2.70–2.80V (VCCRTP), and back to VBAT when VCC falls below 2.60–2.70V (VCCFTP). This 100mV hysteresis prevents oscillation during supply transitions and is optimized for 3.3V nominal operation - unlike DS1836A/B variants rated for 5V systems.
Is DS1836DS-20+T&R compatible with PIC microcontrollers?
Yes, DS1836DS-20+T&R is explicitly designed for PIC microprocessor applications, delivering a 350ms reset pulse meeting PIC's power-on reset timing requirements. Its 2.72V typical trip point aligns with 3.3V PIC supply rails, and its push-pull RST output interfaces directly with PIC MCLR pins without level-shifting or external components.
DS1836DS-20+T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroManager
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T&R FAQ
1.How can I place an order for DS1836DS-20+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1836DS-20+T&R 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+T&R reliable?
The price and inventory of DS1836DS-20+T&R 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+T&R is usually 5 days.
3.What payment methods are accepted for DS1836DS-20+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1836DS-20+T&R transactions.
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4.How is shipping managed for DS1836DS-20+T&R?
DS1836DS-20+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1836DS-20+T&R 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+T&R?
For technical support, including DS1836DS-20+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1836DS-20+T&R requirements.
6.How does Aetrix verify that DS1836DS-20+T&R is sourced from the original manufacturer or authorized distributors?
All DS1836DS-20+T&R 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+T&R meets industry standards.
7.What is the process for return or replacement of DS1836DS-20+T&R?
All DS1836DS-20+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1836DS-20+T&R, 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+T&R part is unused and in its original packaging.
Return procedure for DS1836DS-20+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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