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Analog Devices Inc./Maxim Integrated DS1836AS-5+T&R
- Part No.:
- DS1836AS-5+T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS1836AS-5+T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,561
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Product details
Overview
DS1836AS-5+T&R 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 falls below 1.25V - ideal for PIC-based embedded systems with dual-supply backup.
For engineers reviewing the DS1836AS-5+T&R datasheet, DS1836AS-5+T&R pinout, DS1836AS-5+T&R application, or DS1836AS-5+T&R equivalent, key selection criteria include its 4.63V typical VCC trip point, push-pull RST output, battery switchover behavior, NMI sensing capability, and SO-8 package compatibility with industrial temperature range operation.
Technical Context
The DS1836AS-5+T&R implements a precision bandgap-referenced voltage comparator to detect VCC deviations, generating an internal power-fail signal that forces RST active. Its dual-threshold hysteresis (3.8V fall, 3.9V rise) controls seamless VOUT switching between VCC and VBAT without external logic.
It features a high-impedance IN pin referenced to a 1.25V internal threshold, enabling user-configurable early-warning NMI via external resistor divider. The push-pull RST output maintains valid logic levels down to 0V VCC, while NMI requires an external 10kΩ pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.63V typical; ensures reset assertion before 5V supply collapse affects system stability |
| Reset Pulse Width | 350ms minimum; provides sufficient time for microcontroller initialization after power recovery |
| VCC-to-VBAT Switch Threshold | 3.8V (fall), 3.9V (rise); enables reliable backup power handover with 100mV hysteresis |
| IN Pin Trip Voltage | 1.25V ±0.1V; supports configurable early-warning NMI using external resistor divider |
| Operating Temperature | -40°C to +85°C; qualified for industrial-grade embedded applications |
| Package | 8-pin SOIC (150-mil); surface-mount compatible with standard reflow profiles |
| RST Output Type | CMOS push-pull; eliminates need for external pull-up and supports 0V VCC validity |
Pinout & Package
DS1836AS-5+T&R is housed in an 8-pin SOIC (150-mil) package with gull-wing leads, RoHS-compliant and tape-and-reel packaged (T&R).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | 5V nominal input; monitored for reset generation and VOUT source selection |
| VBAT | Battery backup supply input | Provides standby power when VCC drops below 3.8V; low-leakage (<0.1μA) |
| NC | No-connect terminal | Internally unconnected; must remain floating or grounded per layout guidelines |
| VOUT | Switched power output | Delivers regulated power from either VCC or VBAT depending on threshold crossing |
| GND | Ground reference | Common return path for all analog and digital functions; requires low-impedance PCB connection |
| IN | External sense input | High-impedance comparator input; triggers NMI when voltage falls below 1.25V |
| NMI | Non-maskable interrupt output | Open-drain output requiring external 10kΩ pull-up; signals imminent power loss |
| RST | Reset output | CMOS push-pull; actively drives low during fault and remains asserted 350ms post-recovery |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply power switch | Automatically selects VCC or VBAT for VOUT with 100mV hysteresis, eliminating manual switchover circuitry |
| Early-warning NMI | Configurable sense input (IN) with 1.25V threshold enables system shutdown before reset activation |
| 0V-valid RST output | Push-pull structure maintains defined logic state even when VCC = 0V, supporting fail-safe shutdown |
| Temperature-compensated reference | On-chip bandgap reference ensures stable 1.25V trip point and 4.63V VCC detection across -40°C to +85°C |
| Low quiescent current | 35–55μA typical ICC enables long-term battery backup operation without significant drain |
Applications
| Industrial PLC Power Management | PIC Microcontroller Supervision |
|---|---|
Use Scenario: Programmable logic controller maintaining operation during AC mains interruption using supercapacitor or lithium backup. IC Role / Device Role / Timing Role: Power supervisor and automatic supply selector ensuring uninterrupted VOUT and controlled reset sequencing. Use Value: Prevents firmware corruption by asserting RST before brownout and enabling graceful I/O save via NMI at 1.25V sense threshold. | Use Scenario: PIC16F or PIC18F-based sensor node powered from 5V rail with coin-cell backup. IC Role / Device Role / Timing Role: System monitor providing power-fail warning (NMI), reset hold (RST), and seamless VOUT switchover. Use Value: Enables deterministic wake-up from sleep mode and safe EEPROM write abort upon detected voltage decay. |
| Medical Diagnostic Equipment | Point-of-Sale Terminal Backup |
Use Scenario: Portable ultrasound device requiring data integrity during brief battery-swapping events. IC Role / Device Role / Timing Role: Dual-supply manager asserting NMI for buffer flush and RST for controlled reboot after power restoration. Use Value: Guarantees 350ms reset pulse duration and 1.25V-triggered NMI to preserve critical acquisition buffers. | Use Scenario: Retail terminal with 5V main supply and CR2032 backup sustaining real-time clock and RAM during outage. IC Role / Device Role / Timing Role: Supervisor delivering clean VOUT from battery during AC loss and initiating orderly transaction rollback. Use Value: Uses precise 3.8V/3.9V thresholds to minimize unnecessary switchover and extend backup runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | Single 5V reset IC with 4.65V trip point; no power-switching or NMI functionality | Lacks VOUT switchover and early-warning interrupt; suitable only for basic reset needs | Choose when only reset supervision is required and backup power management is handled externally |
| TPS3823-50DBVR | 5V supervisor with 4.63V threshold and watchdog timer; no battery switchover or NMI pin | Includes watchdog timeout but omits dual-supply control and programmable sense input | Select when system-level watchdog monitoring is prioritized over power-path autonomy |
Compared with MAX692AESA+ and TPS3823-50DBVR, the DS1836AS-5+T&R uniquely integrates reset generation, battery switchover, and NMI signaling in one SO-8 device - reducing BOM count and PCB area where coordinated power-fail response is essential.
Availability
DS1836AS-5+T&R is available at Aetrix Electronics and suitable for industrial PLC power management, PIC microcontroller supervision, medical diagnostic equipment, and point-of-sale terminal backup requiring stable component supply and long-term lifecycle support.
Supply support for DS1836AS-5+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 DS1836AS-5+T&R belongs to Maxim's MicroManager family of supervisory circuits, engineered specifically for systems needing coordinated reset, power switchover, and early-warning interrupt in space-constrained embedded designs.
FAQ
What is the VCC reset threshold for DS1836AS-5+T&R?
The DS1836AS-5+T&R has a nominal VCC reset threshold of 4.63V, with guaranteed limits of 4.50V to 4.75V over temperature. This threshold is factory-trimmed and temperature-compensated using an internal bandgap reference, ensuring consistent reset assertion timing across the full -40°C to +85°C operating range. The DS1836AS-5+T&R uses this value to initiate reset during power-up and power-down transients.
Does DS1836AS-5+T&R support battery backup switchover?
Yes, DS1836AS-5+T&R automatically switches VOUT between VCC and VBAT based on precise thresholds: it transitions from VBAT to VCC when VCC rises above 3.9V, and back to VBAT when VCC falls below 3.8V. This hysteresis prevents oscillation during marginal supply conditions. The DS1836AS-5+T&R maintains valid VOUT regulation during switchover and supports up to 100mA load current from either supply.
How does the NMI function work on DS1836AS-5+T&R?
The DS1836AS-5+T&R generates a non-maskable interrupt when the voltage at the IN pin drops below 1.25V, using an internal precision comparator referenced to a bandgap voltage. The IN pin is high-impedance, allowing flexible sensing via external resistor dividers. The NMI output is open-drain and requires a 10kΩ pull-up. This feature enables early power-fail warning before RST activation, giving the system time to save state - a core capability of the DS1836AS-5+T&R.
What is the reset pulse width of DS1836AS-5+T&R after VCC recovery?
The DS1836AS-5+T&R holds the RST output active for a minimum of 350ms after VCC returns to a valid in-tolerance condition. This delay is internally generated and independent of external components, ensuring reliable microcontroller initialization. The DS1836AS-5+T&R guarantees this timing across temperature and supply variations, with typical values ranging from 350ms to 500ms per AC specifications.
Is DS1836AS-5+T&R compatible with 3.3V systems?
No, DS1836AS-5+T&R is specifically configured for 5V operation, indicated by the "-5" suffix and its 4.63V VCC trip point. For 3.3V systems, Maxim offers variants like DS1836CS-10+T&R (2.88V trip) or DS1836CS-20+T&R (2.72V trip). Using DS1836AS-5+T&R in a 3.3V design would result in premature or continuous reset assertion, as its threshold exceeds normal 3.3V rail tolerances.
DS1836AS-5+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:
- 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+T&R FAQ
1.How can I place an order for DS1836AS-5+T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1836AS-5+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 DS1836AS-5+T&R reliable?
The price and inventory of DS1836AS-5+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 DS1836AS-5+T&R is usually 5 days.
3.What payment methods are accepted for DS1836AS-5+T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1836AS-5+T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1836AS-5+T&R?
DS1836AS-5+T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1836AS-5+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 DS1836AS-5+T&R?
For technical support, including DS1836AS-5+T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1836AS-5+T&R requirements.
6.How does Aetrix verify that DS1836AS-5+T&R is sourced from the original manufacturer or authorized distributors?
All DS1836AS-5+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 DS1836AS-5+T&R meets industry standards.
7.What is the process for return or replacement of DS1836AS-5+T&R?
All DS1836AS-5+T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1836AS-5+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 DS1836AS-5+T&R part is unused and in its original packaging.
Return procedure for DS1836AS-5+T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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