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Analog Devices Inc./Maxim Integrated DS1708REPA+
- Part No.:
- DS1708REPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
DS1708REPA+.pdf
- Description:
- IC MICROMONITOR 3.3V 20% 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:12,836
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Product details
Overview
DS1708REPA+ from Maxim Integrated is a 3.3V supply voltage supervisor IC with 20% reset threshold tolerance, active-low and active-high reset outputs (RST and RST), non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC and an external sense point (IN) to detect power failure, provides 130 ms minimum reset pulse width, and operates across -40°C to +85°C for industrial embedded systems.
For engineers reviewing the DS1708REPA+ datasheet, DS1708REPA+ pinout, DS1708REPA+ application, or DS1708REPA+ equivalent, key selection criteria include its 3.3V-20% trip point (VCCTP = 2.55V–2.70V), dual reset outputs, NMI early-warning capability, PBRST debounced input, and compatibility with 8-pin DIP packaging in industrial temperature range.
Technical Context
The DS1708REPA+ integrates three independent monitoring functions: VCC supply supervision (trip point 2.55V–2.70V), high-impedance IN pin sensing (1.25V reference), and PBRST input debouncing. Its internal bandgap reference enables temperature-compensated accuracy, and hysteresis prevents false NMI triggers from noise.
It generates synchronized RST/RST outputs during power-down and power-up, holding reset active ≥130 ms after VCC recovery. The NMI output pulses low for ≥200 µs when IN falls below 1.25V, with built-in 5 µs detection delay and 100 µV hysteresis to reject transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.55V–2.70V (20% tolerance at 3.3V; ensures reliable reset assertion before microprocessor brownout) |
| Reset Pulse Width | 130–285 ms (guaranteed minimum stabilizes processor and power rail post-recovery) |
| IN Trip Voltage | 1.20–1.30V (high-impedance sense input enables flexible upstream voltage monitoring via resistor divider) |
| NMI Pulse Width | ≥200 µs (provides deterministic early warning of power decay before reset activation) |
| Supply Current | 50 µA (at VCC < 3.6V; enables ultra-low-power operation in battery-backed systems) |
| Operating Temp | -40°C to +85°C (supports industrial-grade reliability without derating) |
| Package | 8-pin Plastic DIP (300-mil; through-hole mounting compatible with legacy PCB layouts) |
Pinout & Package
DS1708REPA+ uses an 8-pin Plastic DIP (300-mil) package with standard through-hole footprint. Pin assignments are fixed per mechanical drawing and validated for this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PBRST | Pushbutton Reset Input | Active-low debounced input; initiates ≥130 ms RST/RST pulse on release |
| VCC | Power Supply Input | Primary supply rail (1.2V–5.5V); powers internal circuitry and defines VCCTP |
| GND | Ground Reference | Return path for all internal currents and comparator references |
| IN | Voltage Sense Input | High-impedance input referenced to 1.25V internal bandgap; monitors external supply point |
| RST | Active-Low Reset Output | Open-drain output asserted low during power fault or PBRST event |
| RST | Active-High Reset Output | Push-pull output asserted high during same conditions as RST |
| NC | No Connect | Unbonded pin; must remain unconnected per design |
| NMI | Non-Maskable Interrupt Output | Open-drain output pulsed low ≥200 µs when IN falls below 1.25V |
Key Features
| Feature | Design Value |
|---|---|
| Dual Reset Outputs | RST (active-low) and RST (active-high) provide direct interface to diverse microprocessor reset architectures without level-shifting |
| Programmable Sense Input | IN pin accepts user-defined voltage divider to monitor upstream rails (e.g., 12V or 5V) while operating from 3.3V supply |
| Debounced Pushbutton Interface | PBRST input eliminates external RC debounce components and guarantees ≥130 ms reset pulse regardless of button bounce |
| Early Power-Fail Warning | NMI output delivers deterministic interrupt ≥200 µs before RST assertion, enabling graceful shutdown or data save |
| Industrial Temperature Range | Guaranteed operation from -40°C to +85°C supports deployment in harsh environments without thermal margining |
Applications
| Industrial PLC Controller | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Continuous operation in factory-floor programmable logic controllers where voltage sags occur due to motor switching. IC Role / Device Role / Timing Role: DS1708REPA+ monitors 3.3V core supply and upstream 24V field bus; asserts RST before CPU lockup and pulses NMI for firmware-initiated safe state transition. Use Value: Prevents corrupted I/O states by ensuring deterministic reset timing and enabling pre-failure data logging via NMI interrupt. |
Use Scenario: Portable ultrasound units powered by Li-ion batteries experiencing gradual discharge and load-induced voltage dips. IC Role / Device Role / Timing Role: DS1708REPA+ supervises 3.3V system rail and senses battery voltage via IN divider; triggers NMI for memory backup before RST halts processing. Use Value: Guarantees lossless preservation of acquired image buffers during brownout events using precise 2.55V–2.70V trip window. |
| Telecom Base Station Card | Energy Meter with Tamper Detection |
Use Scenario: Hot-swappable line cards in carrier-grade base stations subject to transient surges and cold-start sequencing delays. IC Role / Device Role / Timing Role: DS1708REPA+ holds DSP and FPGA in reset until 3.3V rail stabilizes ≥130 ms post-power-on; PBRST enables manual card reset without external logic. Use Value: Eliminates need for discrete RC reset circuits and ensures compliance with GR-63-CORE power sequencing requirements. |
Use Scenario: Revenue-grade electricity meters requiring secure, tamper-resistant power monitoring to detect supply manipulation attempts. IC Role / Device Role / Timing Role: DS1708REPA+ monitors both 3.3V logic supply and 12V metering rail via IN; NMI flags anomalous voltage drops for cryptographic log entry prior to RST. Use Value: Provides hardware-enforced, time-stamped evidence of power tampering with sub-µs NMI response latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708ESA+ | 5V-10% trip point (4.25V–4.50V); no IN sense input; identical 8-pin SOIC footprint | Limited to 5V-only systems; lacks programmable voltage monitoring and early-warning NMI | Select when only VCC supervision is needed and board uses SOIC packaging |
| TPS3808G33DBVR | 3.3V-3% trip point (3.19V–3.41V); single active-low reset; no NMI or PBRST; SOT-23-6 package | Higher accuracy but no early warning or pushbutton support; smaller footprint limits routing flexibility | Select when tight threshold tolerance is critical and space-constrained designs exclude dual-output or NMI needs |
Compared with MAX708ESA+ and TPS3808G33DBVR, DS1708REPA+ uniquely combines 3.3V-20% supervision, dual reset polarity, NMI early warning, and PBRST debouncing in a through-hole DIP package-enabling robust, feature-complete power management without layout redesign.
Availability
DS1708REPA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom base station cards, and energy meters requiring stable component supply with long-term lifecycle assurance.
Supply support for DS1708REPA+ 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) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The DS1707/DS1708 family was designed as precision voltage supervisors for microprocessor-based systems requiring coordinated reset, early power-fail warning, and pushbutton control in harsh environments.
FAQ
What is the exact VCC trip point range for DS1708REPA+?
The DS1708REPA+ has a guaranteed VCC trip point range of 2.55V to 2.70V, corresponding to 20% tolerance around a nominal 3.3V supply. This specification is validated across -40°C to +85°C and ensures reset assertion occurs before most 3.3V microprocessors enter undefined operation. The DS1708REPA+ datasheet specifies VCCTP min/max values under DC electrical characteristics.
Does DS1708REPA+ support monitoring a voltage higher than its VCC supply?
Yes, DS1708REPA+ supports monitoring voltages above 3.3V using the IN pin with an external resistor divider. The IN input is referenced to a 1.25V internal bandgap, so a properly scaled divider (e.g., R1=26kΩ, R2=10kΩ) allows sensing of up to ~11.88V while keeping IN ≤ VCC. This enables upstream rail monitoring without additional level-shifting circuitry.
How does the NMI output of DS1708REPA+ differ from the RST outputs?
The NMI output of DS1708REPA+ provides early warning of impending power failure by pulsing low ≥200 µs when the IN pin voltage drops below 1.25V, whereas RST and RST activate only after VCC itself falls below 2.55V. NMI has 5 µs detection delay and 100 µV hysteresis to reject noise, giving firmware time to execute critical save routines before reset occurs.
Can DS1708REPA+ be used with a pushbutton that pulls PBRST high instead of low?
No - DS1708REPA+ requires an active-low signal on PBRST. The pin is internally pulled up to VCC (~40 kΩ), so the pushbutton must connect PBRST to GND to generate a valid reset. Pulling PBRST high violates the VIH/VIL specifications and will not trigger the debounced reset function. External pull-up resistors are unnecessary and may interfere with internal biasing.
Is DS1708REPA+ pin-compatible with other devices in the DS1707/DS1708 family?
Yes, DS1708REPA+ shares identical 8-pin DIP (300-mil) pinout with all DS1707/DS1708 variants including DS1707EPA, DS1708EPA, and DS1708TEPA. Pin functions (PBRST, VCC, GND, IN, RST, RST, NC, NMI) are consistent across the family, enabling drop-in replacement when trip point and tolerance match system requirements.
DS1708REPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 130ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
DS1708REPA+ FAQ
1.How can I place an order for DS1708REPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1708REPA+ 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 DS1708REPA+ reliable?
The price and inventory of DS1708REPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1708REPA+ is usually 5 days.
3.What payment methods are accepted for DS1708REPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1708REPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1708REPA+?
DS1708REPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1708REPA+ 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 DS1708REPA+?
For technical support, including DS1708REPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1708REPA+ requirements.
6.How does Aetrix verify that DS1708REPA+ is sourced from the original manufacturer or authorized distributors?
All DS1708REPA+ 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 DS1708REPA+ meets industry standards.
7.What is the process for return or replacement of DS1708REPA+?
All DS1708REPA+ units undergo pre-shipment inspection (PSI). If there is an issue with DS1708REPA+, 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 DS1708REPA+ part is unused and in its original packaging.
Return procedure for DS1708REPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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