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Analog Devices Inc./Maxim Integrated DS1818-5+TR
- Part No.:
- DS1818-5+TR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
DS1818-5+TR.pdf
- Description:
- IC SUPERVISOR ECONORESET W/ PB
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
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Product details
Overview
DS1818-5+TR 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 5% trip-point tolerance. It monitors VCC for power-fail detection and provides manual reset via external pushbutton, used in microprocessor-based embedded systems requiring reliable power-on and brownout reset.
For engineers reviewing the DS1818-5+TR datasheet, DS1818-5+TR pinout, DS1818-5+TR application, or DS1818-5+TR equivalent, key selection factors include its fixed 3.3V threshold (2.98–3.15V), 35µA max quiescent current, 150ms guaranteed reset pulse width, SOT-23-3 package, and integrated 5.5kΩ internal pullup resistor.
Technical Context
The DS1818-5+TR implements a precision temperature-compensated voltage reference and comparator to detect VCC deviations beyond ±5% of 3.3V. Its reset assertion is triggered on both power-down (VCC falling below VCCTP) and manual pushbutton activation (RST pulled low ≥1µs).
After VCC returns to tolerance, the device holds RST active for 100–250ms (typ. 150ms) to ensure processor stabilization. The open-drain output supports flexible interface logic levels and allows wired-OR configuration with other reset sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 2.98V to 3.15V (±5% of 3.3V); ensures precise brownout detection at nominal 3.3V rail |
| Reset Pulse Width | 100–250ms (typ. 150ms); guarantees sufficient time for microprocessor core and PLL lock stabilization |
| Quiescent Current | ≤35µA at VCC ≤5.5V; enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Internal Pullup | 3.5–7.5kΩ (typ. 5.5kΩ); eliminates need for external pullup resistor in most 3.3V I/O applications |
| Operating Temp | -40°C to +85°C; supports industrial-grade deployment without derating |
| Output Type | Open-drain RST with active-low assertion; compatible with CMOS/TTL inputs and supports wired-OR reset bus |
| Pushbutton Response | Detects RST pin low ≥1µs; generates 150ms reset pulse upon release-enables reliable manual system reset |
Pinout & Package
SOT-23-3 surface-mount package with 1.3mm × 2.9mm footprint, JEDEC MO-178 compliant, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST) | Active-low open-drain reset output | Drives low during power failure or pushbutton event; requires external pullup only if interfacing >3.3V logic |
| 2 (VCC) | Power supply input | Accepts 1.0V to 5.5V; internally powers reference, comparator, and timing circuitry |
| 3 (GND) | Ground reference | Provides return path for internal current sources and defines voltage thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V reset threshold with ±5% tolerance | Eliminates external resistor network calibration; reduces BOM count and layout area for 3.3V systems |
| Integrated 5.5kΩ pullup resistor | Reduces component count and board space versus discrete pullup; simplifies design for standard 3.3V I/O |
| 150ms reset timeout after VCC recovery | Ensures stable clock and supply conditions before releasing processor reset-prevents boot failures |
| Pushbutton reset with 1µs detection window | Enables robust manual reset without debounce circuitry; supports momentary switch integration |
| Temperature-compensated voltage reference | Maintains trip-point accuracy across -40°C to +85°C-critical for industrial reliability |
Applications
| Industrial PLC Controller | Medical Diagnostic Handheld |
|---|---|
Use Scenario: Power cycling during field maintenance or battery swap in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset and brownout protection for ARM Cortex-M4 MCU. Use Value: 150ms reset hold ensures full FPGA configuration and real-time OS initialization before application code execution. | Use Scenario: Intermittent AC adapter use with Li-ion backup in portable ultrasound devices. IC Role / Device Role / Timing Role: Voltage monitor and manual reset generator for low-power SoC with sleep/wake cycles. Use Value: 35µA quiescent current minimizes standby drain; pushbutton reset enables user-initiated reboots without hardware redesign. |
| Smart Energy Meter | Automotive Telematics Gateway |
Use Scenario: Voltage transients during load switching in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Precision VCC supervisor detecting 3.3V rail collapse due to relay coil back-EMF. Use Value: ±5% trip tolerance (2.98–3.15V) prevents false resets while catching true brownouts affecting metrology ADC accuracy. | Use Scenario: Cold-cranking events causing 12V system dips that propagate to 3.3V domain via DC/DC converter. IC Role / Device Role / Timing Role: Secondary reset source monitoring post-regulation 3.3V rail for infotainment and CAN gateway MCU. Use Value: -40°C to +85°C operation ensures functionality during engine bay thermal extremes; open-drain output interfaces directly with automotive-grade reset controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD33+T | Same 3.3V ±5% threshold, but no pushbutton reset function; 140ms min reset pulse | Lacks manual reset capability; requires external circuitry for button interface | Select when pushbutton functionality is unnecessary and lowest possible cost is prioritized |
| TPS3808G33DBVR | Adjustable delay (via capacitor) instead of fixed 150ms; higher 12µA typical ICC; no internal pullup | Requires external RC network for timing; needs external pullup for 3.3V logic | Choose when reset timeout must be tuned per system-e.g., for FPGAs with longer configuration times |
Compared with MAX809TRD33+T and TPS3808G33DBVR, the DS1818-5+TR uniquely integrates pushbutton reset detection and an internal 5.5kΩ pullup, reducing external components while delivering deterministic 150ms reset timing-ideal for cost-sensitive, space-constrained 3.3V microcontroller systems.
Availability
DS1818-5+TR is available at Aetrix Electronics and suitable for industrial control panels, medical handheld diagnostics, smart metering, and automotive telematics gateways requiring stable component supply and long-term lifecycle support.
Supply support for DS1818-5+TR 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, medical, and communications applications.
The DS1818-5+TR belongs to the EconoReset™ family of supervisory ICs engineered for cost-effective, reliable power monitoring and reset generation in resource-constrained embedded systems.
FAQ
What is the exact VCC trip point range for DS1818-5+TR?
The DS1818-5+TR has a guaranteed VCC trip point range of 2.98V to 3.15V at -40°C to +85°C, corresponding to ±5% tolerance around the nominal 3.3V threshold. This specification is tested and guaranteed per the datasheet's DC Electrical Characteristics table, and applies across the full operating temperature range without derating.
Does DS1818-5+TR require an external pullup resistor on the RST pin?
No, DS1818-5+TR includes an internal 5.5kΩ pullup resistor (3.5–7.5kΩ range). An external pullup is only needed when interfacing with logic families requiring higher voltage levels (e.g., 5V-tolerant inputs) or when driving heavy capacitive loads exceeding 10pF. For standard 3.3V CMOS/TTL, the internal pullup suffices.
How does the pushbutton reset function work on DS1818-5+TR?
The DS1818-5+TR monitors its own RST pin: pulling it low for ≥1µs triggers a manual reset. Upon release, the device asserts RST active-low for 100–250ms (typically 150ms). This eliminates need for external debounce circuits and supports direct connection to momentary switches-no additional components required for functional manual reset.
What is the maximum supply voltage the DS1818-5+TR can tolerate on VCC?
The DS1818-5+TR supports VCC from 1.0V to 5.5V under recommended operating conditions. Its absolute maximum rating is +7.0V on VCC relative to GND, but operation above 5.5V is not guaranteed and may impact reliability or parametric performance. For sustained operation, VCC must remain within 1.0V–5.5V.
Is DS1818-5+TR pin-compatible with other packages like TO-92?
No-DS1818-5+TR is specified and supplied exclusively in SOT-23-3 package. While the DS1818 family includes TO-92 variants (e.g., DS1818-5+), the "+TR" suffix denotes tape-and-reel SOT-23-3 packaging. Pin numbering and electrical behavior are identical between SOT-23 and TO-92 versions, but physical mounting, thermal performance, and PCB footprint differ significantly.
DS1818-5+TR 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:
- Bulk
- Product Status:
- Active
- 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+TR FAQ
1.How can I place an order for DS1818-5+TR through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1818-5+TR 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+TR reliable?
The price and inventory of DS1818-5+TR 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+TR is usually 5 days.
3.What payment methods are accepted for DS1818-5+TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1818-5+TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1818-5+TR?
DS1818-5+TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1818-5+TR 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+TR?
For technical support, including DS1818-5+TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1818-5+TR requirements.
6.How does Aetrix verify that DS1818-5+TR is sourced from the original manufacturer or authorized distributors?
All DS1818-5+TR 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+TR meets industry standards.
7.What is the process for return or replacement of DS1818-5+TR?
All DS1818-5+TR units undergo pre-shipment inspection (PSI). If there is an issue with DS1818-5+TR, 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+TR part is unused and in its original packaging.
Return procedure for DS1818-5+TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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