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Analog Devices Inc./Maxim Integrated DS1836A-5+
- Part No.:
- DS1836A-5+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
DS1836A-5+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,432
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Product details
Overview
DS1836A-5+ from Maxim Integrated is a 5V microprocessor supervisory circuit combining power-on reset, battery backup switching, and non-maskable interrupt generation. It monitors VCC with 4.63V typical trip point, switches VOUT between VCC and VBAT at 3.85V/3.95V thresholds, asserts RST for 350ms after recovery, and triggers NMI when IN drops below 1.25V - used in PIC-based embedded systems requiring dual-supply resilience.
For engineers reviewing the DS1836A-5+ datasheet, DS1836A-5+ pinout, DS1836A-5+ application, or DS1836A-5+ equivalent, key selection criteria include VCC reset threshold accuracy, battery switchover hysteresis, NMI trip voltage tolerance, RST output drive capability (10mA sink), and operation across –40°C to +85°C industrial temperature range.
Technical Context
The DS1836A-5+ integrates three tightly coupled functions: a precision bandgap-referenced comparator for VCC monitoring, a bidirectional analog power switch controlling VOUT path selection between VCC and VBAT, and an independent high-impedance sense input (IN) referenced to 1.25V internal threshold. Its push-pull RST output maintains valid logic down to 0V supply, unlike open-drain alternatives.
It operates over 1.2V–5.5V supply range with 55μA typical quiescent current at 5.5V, supports dual-voltage systems via fixed 5V-specific thresholds (4.50–4.75V trip, 3.80–3.90V switchover down, 3.90–4.00V switchover up), and delivers 10mA RST sink current while limiting IN input leakage to ±1.0μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V typical; ensures reliable reset assertion before 5V rail collapse in microcontroller systems |
| VCC-to-VBAT Switchover | 3.85V typical down, 3.95V typical up; provides 100mV hysteresis to prevent oscillation during brownout |
| RST Active Duration | 350ms typical after VCC recovery; guarantees sufficient time for CPU initialization and peripheral stabilization |
| IN Trip Voltage | 1.25V ±0.1V; enables early-warning NMI via external resistor divider for upstream power monitoring |
| RST Output Drive | 10mA sink capability; directly drives TTL/CMOS inputs without external pull-down |
| Operating Temp Range | –40°C to +85°C; qualified for industrial-grade embedded control and instrumentation environments |
| Quiescent Current | 55μA typical at 5.5V; minimizes standby power draw in battery-backed systems |
Pinout & Package
DS1836A-5+ is available in 8-pin SOIC (150-mil width) and 8-pin DIP (300-mil width) packages. Both share identical pin mapping and thermal performance under industrial conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | 5V nominal input; monitored for reset and used as primary VOUT source above 3.95V |
| VBAT | Battery backup supply input | Provides VOUT path when VCC falls below 3.85V; draws <0.1μA leakage in off state |
| NC | No-connect terminal | Internally unconnected; must remain floating or tied to GND per layout guidelines |
| VOUT | Switched power output | Delivers regulated power to system from either VCC or VBAT depending on real-time voltage comparison |
| GND | Ground reference | Common return for all analog and digital functions; requires low-impedance PCB connection |
| IN | High-impedance sense input | Monitors external voltage via resistor divider; triggers NMI when voltage drops below 1.25V |
| NMI | Open-drain non-maskable interrupt | Requires external 10kΩ pull-up; signals imminent power failure before RST activation |
| RST | Push-pull reset output | Drives active-low reset to microcontrollers; sinks 10mA and remains valid even if VCC = 0V |
Key Features
| Feature | Design Value |
|---|---|
| True 5V power-on reset | Guarantees 350ms reset hold after VCC reaches regulation, eliminating need for RC timing networks |
| Battery switchover with hysteresis | Automatically transfers VOUT from VCC to VBAT at 3.85V and back at 3.95V, preventing chatter during marginal supply conditions |
| Early-warning NMI generation | Triggers interrupt at 1.25V IN threshold, enabling >100ms of controlled shutdown time before RST activates |
| 0V-valid RST output | Push-pull structure maintains defined logic state on RST even when both VCC and VBAT drop to 0V |
| Industrial temperature operation | Specified from –40°C to +85°C with full parameter compliance, supporting harsh-environment deployment |
Applications
| Embedded Microcontroller Systems | PIC-Based Control Units |
|---|---|
Use Scenario: Power supervision for PIC16F/18F microcontrollers in programmable logic controllers with battery-backed RAM. IC Role / Device Role / Timing Role: Primary supervisory IC providing reset, power-switching, and early-failure warning. Use Value: Eliminates discrete reset IC + analog switch + comparator, reducing BOM count by ≥3 components and PCB area by 35%. | Use Scenario: Dual-supply management in solar charge controllers where main 5V rail may fail and backup battery must sustain critical firmware execution. IC Role / Device Role / Timing Role: System-level power integrity manager coordinating reset timing, supply handover, and graceful shutdown sequencing. Use Value: Provides deterministic 350ms reset pulse and 100mV switchover hysteresis, ensuring no spurious resets during solar panel voltage fluctuations. |
| Industrial Data Loggers | Medical Diagnostic Instruments |
Use Scenario: Battery-backed data acquisition units storing sensor readings during AC mains loss. IC Role / Device Role / Timing Role: Power-fail detector and VOUT path selector enabling seamless transition to backup power without data corruption. Use Value: NMI at 1.25V IN threshold gives ≥200ms warning before VCC dropout, allowing flash write completion and SRAM save operations. | Use Scenario: Portable ultrasound devices requiring guaranteed reset behavior and battery fallback during battery swap or charger disconnection. IC Role / Device Role / Timing Role: Safety-critical power monitor enforcing IEC 62304 power-loss response requirements. Use Value: Valid RST output down to 0V ensures microcontroller remains held in reset until safe power restoration, preventing undefined states during reinsertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACPE+ | 5V-only reset with 4.65V threshold; no battery switchover or NMI; 200ms reset timeout | Lacks power-path switching and early-warning interrupt; suitable only for basic reset-only use cases | Select when battery backup and predictive shutdown are unnecessary and cost reduction is prioritized |
| TPS3823-50DBVR | 5V supervisor with 4.63V threshold and 200ms reset delay; no VOUT switching or IN sense input | Single-function reset IC; requires external circuitry for battery switchover and NMI functionality | Choose when system already implements discrete power switching and only needs precise reset timing |
Compared with MAX691ACPE+ and TPS3823-50DBVR, the DS1836A-5+ uniquely integrates reset, battery switchover, and NMI in one package - reducing component count, simplifying layout, and enabling predictive power-loss response not possible with standalone reset ICs.
Availability
DS1836A-5+ is available at Aetrix Electronics and suitable for embedded microcontroller systems, industrial data loggers, PIC-based control units, and medical diagnostic instruments requiring stable component supply and long-term lifecycle support.
Supply support for DS1836A-5+ 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 DS1836A-5+ belongs to Maxim's MicroManager family of supervisory circuits, engineered specifically for dual-supply microcontroller systems needing coordinated reset, power switchover, and early-failure warning in compact form factors.
FAQ
What is the exact VCC reset threshold voltage for DS1836A-5+?
The DS1836A-5+ has a specified VCC reset threshold of 4.50V minimum, 4.63V typical, and 4.75V maximum at –40°C to +85°C. This 5V-specific trip point ensures reliable reset assertion before the 5V rail falls outside microcontroller operating specifications. The DS1836A-5+ uses this threshold to force RST active during brownout and maintain it for 350ms after VCC returns to tolerance.
Does DS1836A-5+ support true 0V operation of the RST output?
Yes, the DS1836A-5+ features a push-pull RST output that remains valid even when both VCC and VBAT drop to 0V. Unlike open-drain reset ICs requiring external pull-ups, DS1836A-5+ actively drives RST low or high across its full supply range. This ensures the microcontroller stays in a known reset state during complete power loss - a critical feature confirmed in the DS1836A-5+ datasheet Figure 5 and DC characteristics table.
How does the battery switchover function work in DS1836A-5+?
The DS1836A-5+ switches VOUT between VCC and VBAT using asymmetric thresholds: VOUT transitions from VBAT to VCC when VCC rises above 3.90–4.00V, and back to VBAT when VCC falls below 3.80–3.90V. This 100mV hysteresis prevents oscillation during slow voltage transitions. DS1836A-5+ is specifically configured for 5V systems, distinguishing it from DS1836C/D variants rated for 3.3V operation.
What is the purpose of the IN pin on DS1836A-5+ and what voltage triggers NMI?
The IN pin on DS1836A-5+ is a high-impedance sense input that monitors an external voltage via a resistor divider. It triggers the NMI output when the voltage at IN drops below 1.15–1.35V (1.25V typical). This provides early warning of upstream power degradation - typically 100–200ms before RST activates - enabling controlled shutdown. DS1836A-5+ requires an external 10kΩ pull-up on NMI for proper open-drain operation.
Is DS1836A-5+ compatible with both SOIC and DIP packages?
Yes, DS1836A-5+ is offered in both 8-pin SOIC (150-mil width) and 8-pin DIP (300-mil width) packages, sharing identical pinout, electrical specifications, and thermal performance. The "+" suffix in DS1836A-5+ denotes lead-free, RoHS-compliant packaging. Both variants operate across –40°C to +85°C and support the same 5V supervisory functions including reset, switchover, and NMI generation.
DS1836A-5+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroManager
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 200ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
DS1836A-5+ FAQ
1.How can I place an order for DS1836A-5+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1836A-5+ 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 DS1836A-5+ reliable?
The price and inventory of DS1836A-5+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1836A-5+ is usually 5 days.
3.What payment methods are accepted for DS1836A-5+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1836A-5+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1836A-5+?
DS1836A-5+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1836A-5+ 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 DS1836A-5+?
For technical support, including DS1836A-5+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1836A-5+ requirements.
6.How does Aetrix verify that DS1836A-5+ is sourced from the original manufacturer or authorized distributors?
All DS1836A-5+ 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 DS1836A-5+ meets industry standards.
7.What is the process for return or replacement of DS1836A-5+?
All DS1836A-5+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1836A-5+, 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 DS1836A-5+ part is unused and in its original packaging.
Return procedure for DS1836A-5+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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