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Analog Devices Inc./Maxim Integrated DS1818-5/T&R
- Part No.:
- DS1818-5/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
DS1818-5/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
DS1818-5/T&R from Maxim Integrated is a 3.3V fixed-threshold supervisory IC with pushbutton reset capability, active-low open-drain reset output, 150ms reset timeout, and internal 5.5kΩ pullup resistor. It monitors VCC for power-fail detection in microprocessor systems and supports manual reset via external pushbutton. Used in embedded controllers requiring reliable power-on reset and brownout protection.
For engineers reviewing the DS1818-5/T&R datasheet, DS1818-5/T&R pinout, DS1818-5/T&R application, or DS1818-5/T&R equivalent, key selection factors include its fixed 3.3V trip point (±5%), 150ms reset hold time, 35µA max quiescent current, TO-92/SOT-23 dual-package support, and integrated pushbutton debouncing logic.
Technical Context
The DS1818-5/T&R implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations beyond ±5% of 3.3V. Its reset assertion is triggered by either power-supply dropout or external pushbutton pull-down, with guaranteed 150ms active-low reset pulse after release or power recovery.
It features an open-drain RST output with internal 5.5kΩ pullup, eliminating external components in many designs. The device operates across -40°C to +85°C and draws ≤35µA at VCC = 5.5V, enabling low-power battery-backed applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.98V to 3.15V (±5% of 3.3V); ensures precise brownout detection without external calibration |
| Reset Timeout | 100–250ms (typ. 150ms); guarantees processor stabilization after power-up or pushbutton release |
| Quiescent Current | ≤35µA at VCC ≤ 5.5V; enables multi-year operation in coin-cell-powered systems |
| Output Type | Active-low open-drain with internal 5.5kΩ pullup; reduces BOM count and PCB area |
| Pushbutton Response | Detects ≥1µs low pulse on RST; provides noise-immune manual reset with automatic 150ms hold |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded control environments |
| VCC Range | 1.0V to 5.5V; supports wide-input systems including 1.8V, 2.5V, 3.3V, and 5V rails |
Pinout & Package
DS1818-5/T&R is supplied in SOT-23 (3-pin) and TO-92 (3-pin) packages. Both share identical pin mapping: Pin 1 = RST (active-low open-drain reset output), Pin 2 = VCC (power supply input), Pin 3 = GND (ground reference).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-low reset output | Open-drain driver with internal 5.5kΩ pullup; sinks ≥10mA at 0.4V; compatible with 1.8V–5V logic interfaces |
| 2 (VCC) | Power supply input | Accepts 1.0V–5.5V; powers internal reference, comparator, and timing circuitry |
| 3 (GND) | Ground reference | Common return path for VCC and RST; must be low-impedance for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V ±5% threshold | Eliminates external resistor divider; ensures consistent reset point across temperature and voltage |
| 150ms reset hold time | Guarantees microprocessor core and peripherals stabilize before release - no external RC timing needed |
| Integrated pushbutton interface | Detects momentary low pulse on RST pin and generates clean 150ms reset pulse - no debounce circuit required |
| Internal 5.5kΩ pullup resistor | Reduces component count and board space; eliminates need for external pullup in most 3.3V/5V systems |
| 35µA max supply current | Enables use in always-on, battery-operated devices such as smart meters and IoT edge nodes |
Applications
| Industrial PLC Controller | Smart Energy Meter |
|---|---|
Use Scenario: Power cycling during grid fluctuations or firmware updates requires deterministic reset behavior to prevent corrupted state. IC Role / Device Role / Timing Role: Supervisory IC providing power-fail detection and controlled reset assertion with 150ms hold time. Use Value: Prevents partial initialization and flash corruption by ensuring full stabilization before CPU release. | Use Scenario: Battery-backed real-time clock and metrology ICs require ultra-low-power supervision during mains failure. IC Role / Device Role / Timing Role: Low-quiescent-current (≤35µA) reset supervisor with 3.3V ±5% threshold and pushbutton override. Use Value: Extends backup battery life while maintaining reliable brownout response and field-serviceable reset. |
| Medical Diagnostic Handheld | Automotive Body Control Module |
Use Scenario: Portable diagnostic tools undergo frequent on/off cycles and must boot reliably after cold start or low-battery conditions. IC Role / Device Role / Timing Role: Fixed-threshold reset generator with internal pullup and pushbutton support for user-initiated reboots. Use Value: Eliminates external components and simplifies layout while meeting IEC 60601 immunity requirements for reset integrity. | Use Scenario: BCM microcontrollers operate in harsh automotive environments where voltage transients and thermal stress demand robust reset control. IC Role / Device Role / Timing Role: Industrial-temperature (-40°C to +85°C) supervisory IC with precise 3.3V trip point and fast power-down detection (≤5µs). Use Value: Ensures deterministic MCU reset during load-dump or cranking events without false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD2+T | 3.0V ±2.5% threshold; no pushbutton monitoring; 140ms reset timeout; 1.2µA quiescent current | Lacks manual reset integration; optimized for ultra-low-power standby, not interactive systems | Choose when lowest possible ICC is critical and pushbutton reset is handled externally |
| TPS3808G33DBVR | 3.3V ±0.5% threshold; adjustable reset delay (0–10s); 1.1µA quiescent current; no internal pullup | Higher accuracy and programmable timing but requires external pullup and lacks native pushbutton support | Choose when tight threshold tolerance and flexible timeout are prioritized over BOM simplicity |
Compared with MAX809TRD2+T and TPS3808G33DBVR, DS1818-5/T&R uniquely combines fixed 3.3V ±5% detection, integrated pushbutton logic, internal pullup, and 150ms hold time - delivering complete reset functionality in three pins with zero external components.
Availability
DS1818-5/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart energy meters, medical handheld diagnostics, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for DS1818-5/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, communications, and computing applications.
The DS1818-5/T&R belongs to Maxim's EconoReset™ family of supervisory ICs, engineered for cost-sensitive, space-constrained embedded systems needing reliable power-on and brownout reset with minimal external components.
FAQ
What is the exact reset threshold voltage for DS1818-5/T&R?
The DS1818-5/T&R has a guaranteed VCC trip point of 2.98V (min) to 3.15V (max), corresponding to 3.3V ±5%. This fixed threshold is temperature-compensated and does not require external adjustment. The specification is validated across -40°C to +85°C and applies directly to the DS1818-5/T&R variant as confirmed in the Maxim Integrated datasheet Rev 1 (3/15).
Does DS1818-5/T&R require an external pullup resistor on the RST pin?
No, DS1818-5/T&R includes an internal 5.5kΩ pullup resistor on the RST pin, eliminating the need for an external component in standard 3.3V or 5V systems. The datasheet specifies RP = 3.50–7.5kΩ (typ. 5.5kΩ), and the output sinks ≥10mA at 0.4V. External pullups may be added only if higher drive strength or voltage translation is required.
How does the pushbutton reset function work on DS1818-5/T&R?
The DS1818-5/T&R monitors the RST pin for external pull-down: a ≥1µs low pulse triggers a clean 150ms (typ.) active-low reset pulse upon release. This built-in debouncing avoids external RC networks. The function is fully integrated - no configuration or additional circuitry is needed, and it operates independently of VCC status as long as VCC ≥ 1.0V.
What package options are available for DS1818-5/T&R?
DS1818-5/T&R is offered in both SOT-23 and TO-92 packages, with identical 3-pin pinout (RST-VCC-GND). The "/T&R" suffix indicates tape-and-reel packaging, commonly used for SOT-23. Mechanical drawings for both packages are published in the Maxim Integrated datasheet, and pin compatibility is maintained across variants.
Is DS1818-5/T&R suitable for automotive applications?
DS1818-5/T&R is rated for -40°C to +85°C operation and meets industrial environmental requirements, but it is not AEC-Q100 qualified. For non-safety-critical automotive body electronics (e.g., interior lighting control or accessory modules), it may be deployed with system-level validation. However, for powertrain or ADAS applications, AEC-Q100-compliant alternatives should be selected instead of DS1818-5/T&R.
DS1818-5/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- EconoReset
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.06V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
DS1818-5/T&R FAQ
1.How can I place an order for DS1818-5/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1818-5/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 DS1818-5/T&R reliable?
The price and inventory of DS1818-5/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 DS1818-5/T&R is usually 5 days.
3.What payment methods are accepted for DS1818-5/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1818-5/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1818-5/T&R?
DS1818-5/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1818-5/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 DS1818-5/T&R?
For technical support, including DS1818-5/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1818-5/T&R requirements.
6.How does Aetrix verify that DS1818-5/T&R is sourced from the original manufacturer or authorized distributors?
All DS1818-5/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 DS1818-5/T&R meets industry standards.
7.What is the process for return or replacement of DS1818-5/T&R?
All DS1818-5/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1818-5/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 DS1818-5/T&R part is unused and in its original packaging.
Return procedure for DS1818-5/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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