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Analog Devices Inc./Maxim Integrated DS1836AS-5
- Part No.:
- DS1836AS-5
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1836AS-5.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,006
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Product details
Overview
DS1836AS-5 from Maxim Integrated is a 5V microprocessor supervisory circuit with integrated power-switching and non-maskable interrupt (NMI) functionality. It monitors VCC for out-of-tolerance conditions, asserts a CMOS reset output for 350ms after recovery, switches VOUT between VCC and VBAT at 3.8V/3.9V thresholds, and triggers NMI when the IN pin voltage drops below 1.25V - ideal for PIC-based embedded systems requiring dual-supply resilience.
For engineers reviewing the DS1836AS-5 datasheet, DS1836AS-5 pinout, DS1836AS-5 application, or DS1836AS-5 equivalent, key selection criteria include its 4.63V typical VCC reset trip point, push-pull RST output, 1.25V precision sense threshold, -40°C to +85°C operating range, and compatibility with 8-pin SO (150mil) packaging.
Technical Context
The DS1836AS-5 implements a precision bandgap-referenced comparator for VCC monitoring and IN-sense detection, with hysteresis built into its power-switching logic (VCCRTP = 3.95V, VCCFTP = 3.85V). Its reset generator includes internal timing that guarantees ≥350ms active-low reset assertion after VCC returns to tolerance, independent of external components.
It integrates three co-located functions: power-fail detection with NMI generation (tIPD ≤ 1μs), automatic supply switchover (VOUT sourced from VCC or VBAT), and regulated reset signaling - all operating from a single 1.2V–5.5V supply range with <55μA quiescent current at 5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Trip Point | 4.63V typical; ensures reliable reset assertion before 5V system brownout affects logic stability |
| Reset Active Duration | 350ms minimum after VCC recovery; provides sufficient time for power rail stabilization and MCU initialization |
| VCC-to-VBAT Switch Threshold | 3.85V (falling), 3.95V (rising); enables seamless backup power handover without supply interruption |
| IN Sense Threshold | 1.25V ±0.1V; supports user-defined early-warning voltage monitoring via external resistor divider |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded control and data acquisition environments |
| Supply Current | 55μA max at 5.5V; enables low-power battery-backed operation over extended periods |
| Output Type | CMOS push-pull RST; eliminates need for external pull-up and supports direct interface to 5V logic inputs |
Pinout & Package
DS1836AS-5 is supplied in an 8-pin SOIC package (150mil width), pin-compatible with industry-standard 8-pin DIP footprints but optimized for surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | Primary 5V supply rail; reset and switching logic reference; must be ≥1.2V for valid operation |
| VBAT | Battery backup supply input | Secondary supply source; powers VOUT when VCC falls below 3.85V; leakage <0.1μA in off-state |
| NC | No-connect terminal | Internally unconnected; must remain floating or tied to GND per layout best practice |
| VOUT | Switched power output | Delivers regulated power from VCC or VBAT; output voltage = supply −0.3V under load |
| GND | Ground reference | Common return path for all analog and digital circuitry; requires low-impedance PCB connection |
| IN | External sense input | High-impedance comparator input; triggers NMI when voltage drops below 1.25V; supports up to 7V with current limiting |
| NMI | Non-maskable interrupt output | Open-drain output requiring external 10kΩ pull-up; asserts low on early power-fail warning |
| RST | Reset output | CMOS push-pull active-low reset signal; drives directly into microcontroller reset pin without pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC and user-defined supply via IN pin, enabling layered power-fail detection |
| Automatic supply switchover | VOUT transitions between VCC and VBAT with 100mV hysteresis, eliminating manual power-path control logic |
| Early-warning NMI generation | tIPD ≤ 1μs response from IN voltage drop to NMI assertion, providing maximum shutdown time before reset |
| Reset timing integrity | Guaranteed 350ms reset pulse width independent of VCC slew rate or noise, ensuring robust MCU boot sequencing |
| Low-quiescent-current operation | 55μA max ICC at 5.5V enables >10-year battery life in always-on backup configurations |
Applications
| Industrial PLC I/O Modules | PIC-Based Data Loggers |
|---|---|
Use Scenario: Maintaining real-time sensor data capture during AC mains interruption using supercapacitor or lithium backup. IC Role / Device Role / Timing Role: Supervisory controller that initiates graceful shutdown via NMI, holds reset until backup power stabilizes, and powers critical SRAM via VOUT. Use Value: Prevents data corruption by delivering 350ms of deterministic reset hold time and enabling 10+ ms of pre-reset NMI warning. | Use Scenario: Battery-powered environmental monitor logging temperature/humidity every 10 seconds with flash memory write protection. IC Role / Device Role / Timing Role: Power supervisor that detects main supply collapse, triggers PIC firmware save routine via NMI, then asserts RST only after safe state is stored. Use Value: Eliminates need for discrete reset IC + power switch + comparator, reducing BOM count by 3 components and PCB area by 25mm². |
| Medical Infusion Pumps | Point-of-Sale Terminal Power Management |
Use Scenario: Ensuring fail-safe motor stop and alarm activation during unexpected 5V rail collapse in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical reset generator with guaranteed 350ms reset pulse and dual-supply redundancy via VOUT switching. Use Value: Meets IEC 62304 clause 5.5.3 for deterministic power-loss response without software dependency. | Use Scenario: Supporting hot-swappable 5V power adapters in retail terminals while preserving transaction state across adapter changes. IC Role / Device Role / Timing Role: Seamless power-path manager that switches VOUT from adapter to internal Li-ion without glitch, while asserting RST only if both supplies fall. Use Value: Enables zero-downtime power source transition with no observable system reset or display flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US31D3+ | Fixed 3.08V reset threshold; no power-switching or NMI function; SOT23-3 package | Suitable only for basic reset generation; cannot replace DS1836AS-5's dual-supply management or early-warning capability | Select only if system uses single supply and requires minimal footprint, not functional equivalence |
| TPS3808G33DBVR | 3.3V fixed reset threshold; push-pull RST; no VOUT switching or IN sense input; 5-pin SOT23 | Lacks battery switchover and NMI - requires external circuitry for backup power control and early warning | Choose when cost and size are primary constraints and dual-supply features are handled elsewhere |
Compared with MAX6326US31D3+ and TPS3808G33DBVR, the DS1836AS-5 uniquely integrates reset generation, supply switchover, and NMI in one 8-pin SOIC - eliminating three discrete functions and enabling deterministic power-fail response without firmware intervention.
Availability
DS1836AS-5 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, PIC-based data loggers, and medical infusion pumps requiring stable component supply with long lifecycle support.
Supply support for DS1836AS-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, automotive, and computing applications, with emphasis on reliability and integration.
The DS1836AS-5 belongs to the MicroManager family of supervisory circuits engineered specifically for microprocessor-based systems needing coordinated power monitoring, backup switchover, and fail-safe reset - especially where PIC microcontrollers are deployed.
FAQ
What is the exact reset threshold voltage for DS1836AS-5?
The DS1836AS-5 has a nominal VCC reset trip point of 4.63V, with a guaranteed range of 4.50V to 4.75V across temperature and supply variations. This threshold is factory-trimmed and temperature-compensated using an internal bandgap reference, ensuring consistent 5V system supervision without external calibration. The DS1836AS-5 datasheet specifies this value under DC Electrical Characteristics, Table on page 8.
Does DS1836AS-5 support true 0V reset assertion when both VCC and VBAT are absent?
Yes - the DS1836AS-5 RST output maintains a valid low state even when VCC and VBAT drop to 0V, provided a 100kΩ pull-down resistor is connected from RST to GND (per Figure 5 in the datasheet). This design ensures fail-safe reset assertion during complete power loss, a feature confirmed in the "OUTPUT VALID CONDITIONS" section on page 5 of the DS1836AS-5 documentation.
Can DS1836AS-5 be used with 3.3V systems?
No - the DS1836AS-5 is specifically configured for 5V operation, as indicated by its "-5" suffix and 4.63V reset threshold. For 3.3V systems, Maxim offers the DS1836CS-33 or DS1836DS-33 variants with 2.88V trip points. Using DS1836AS-5 in a 3.3V design would result in continuous reset assertion since VCC never reaches its 4.5V minimum trip level.
What is the purpose of the NC pin on DS1836AS-5?
Pin 3 of the DS1836AS-5 is designated NC (No Connect) and is internally unconnected. It must not be bonded or routed to any net on the PCB; leaving it floating is acceptable, though tying it to GND improves noise immunity in high-EMI environments. This pin assignment is explicitly shown in the Pin Assignment diagram on page 1 of the DS1836AS-5 datasheet and verified across Maxim's 8-pin SOIC supervisory portfolio.
How does the NMI function of DS1836AS-5 differ from the RST output?
The NMI output of DS1836AS-5 provides early-warning interrupt signaling (typically 1–10μs after IN voltage crosses 1.25V), allowing firmware to initiate controlled shutdown, while RST is a delayed, timed reset (350ms after VCC recovery) that forces hardware reboot. NMI is open-drain and requires a pull-up; RST is push-pull and drives directly. This dual-signaling architecture is documented in the OPERATION and NON-MASKABLE INTERRUPT sections of the DS1836AS-5 datasheet.
DS1836AS-5 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS1836AS-5 FAQ
1.How can I place an order for DS1836AS-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1836AS-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 DS1836AS-5 reliable?
The price and inventory of DS1836AS-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1836AS-5 is usually 5 days.
3.What payment methods are accepted for DS1836AS-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1836AS-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1836AS-5?
DS1836AS-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1836AS-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 DS1836AS-5?
For technical support, including DS1836AS-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1836AS-5 requirements.
6.How does Aetrix verify that DS1836AS-5 is sourced from the original manufacturer or authorized distributors?
All DS1836AS-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 DS1836AS-5 meets industry standards.
7.What is the process for return or replacement of DS1836AS-5?
All DS1836AS-5 units undergo pre-shipment inspection (PSI). If there is an issue with DS1836AS-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 DS1836AS-5 part is unused and in its original packaging.
Return procedure for DS1836AS-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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