My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX708RCUA
- Part No.:
- MAX708RCUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708RCUA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,766
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX708RCUA from Maxim Integrated is a +3V microprocessor supervisory circuit in an 8-pin µMAX package, providing active-low RESET and active-high RESET outputs, 2.63V reset threshold, 200ms reset pulse width, and 100µA quiescent current for reliable power-up/brownout monitoring in battery-powered embedded systems.
For engineers reviewing the MAX708RCUA datasheet, MAX708RCUA pinout, MAX708RCUA application, or MAX708RCUA equivalent, this device delivers dual-reset signaling, precision voltage supervision down to VCC = 1V, and integrated power-fail warning without watchdog-critical for portable instrumentation and industrial controllers requiring deterministic reset behavior under low-VCC conditions.
Technical Context
The MAX708RCUA implements a dual-output reset generator with independent internal timing for both RESET (active-low) and RESET (active-high), asserting both signals synchronously when VCC falls below 2.63V or MR is pulled low, and holding them asserted for ≥200ms after recovery. Its power-fail comparator uses a fixed 1.25V reference on PFI to trigger PFO at user-defined supply thresholds via external resistive dividers.
No watchdog timer is present-distinguishing it from MAX706 variants-making it suitable for systems where software-independent reset assurance is prioritized over activity monitoring. The device operates across 1.2V to 5.5V VCC and guarantees RESET assertion down to VCC = 1V, enabling robust operation during deep brownout events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reset activation before 3.3V µP logic fails |
| Reset Pulse Width | 200ms minimum; provides sufficient time for µP initialization and peripheral stabilization |
| Supply Current | 100µA typical; enables multi-year battery life in portable equipment |
| VCC Operating Range | 1.2V to 5.5V; supports operation through deep brownout and compatibility with 3.3V/5V systems |
| Power-Fail Threshold | 1.25V internal reference on PFI; allows configurable early-warning detection of unregulated rail collapse |
| Output Drive | RESET sinks 1.2mA @ 0.3V; RESET sources 500µA @ 0.8×VCC; compatible with TTL/CMOS inputs |
| Guaranteed Reset Assertion | Down to VCC = 1V; prevents undefined µP state during final stage of power loss |
Pinout & Package
Package: 8-pin µMAX (U8-1), 3mm × 3mm surface-mount, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA; debounced by 200ms reset timer |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; powers all internal circuits and enables reset assertion down to 1V |
| 3 (GND) | Ground reference | Common return for all analog and digital functions; required for accurate threshold sensing |
| 4 (PFI) | Power-fail comparator input | High-impedance node referenced to 1.25V; connects to resistor divider for custom undervoltage warning |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; used to interrupt µP or trigger controlled shutdown sequence |
| 6 (RESET) | Active-low reset output | Asserted during power-up, brownout, or MR activation; holds low ≥200ms after recovery |
| 7 (RESET) | Active-high reset output | Complementary to RESET; high during valid VCC, low during fault-supports mixed-logic systems |
| 8 (NC) | No connection | Not internally bonded; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Dual active-reset outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate need for external inverters in mixed-logic designs |
| Precision 2.63V reset threshold | ±1.5% tolerance over temperature; matches 3.3V µP core supply failure margin without external components |
| 1.25V power-fail reference | Stable internal bandgap reference enables accurate early-warning detection of auxiliary rail collapse |
| 200ms reset timeout | Factory-trimmed monolithic timer ensures consistent µP initialization window across voltage/temperature |
| 100µA quiescent current | Enables direct integration into always-on battery backup paths without significant drain |
Applications
| Battery-Powered Portable Instrumentation | Industrial Controller Power Monitoring |
|---|---|
|
Use Scenario: Handheld multimeter operating from single Li-ion cell with 3.3V LDO and real-time clock backup. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and triggers controlled shutdown before RTC data corruption occurs. Use Value: Dual RESET outputs interface directly with µP reset pin and RTC enable line, eliminating discrete logic while ensuring deterministic brownout response. |
Use Scenario: PLC I/O module powered from 24V DC converted to 3.3V/5V rails, requiring fail-safe reset during field power fluctuations. IC Role / Device Role / Timing Role: Monitors 3.3V core supply and asserts synchronized active-high/low resets to isolate firmware execution and hardware peripherals. Use Value: Guaranteed reset assertion down to VCC = 1V prevents latch-up during slow-ramp brownouts common in industrial power distribution. |
| Medical Diagnostic Handset | Network Edge Sensor Node |
|
Use Scenario: Ultrasound probe with embedded ARM Cortex-M4, powered by rechargeable battery and requiring FDA-compliant power integrity logging. IC Role / Device Role / Timing Role: Provides auditable reset event timestamping via PFO-triggered µP interrupt prior to full system reset. Use Value: 1.25V PFI reference enables precise calibration of battery voltage warning thresholds traceable to internal bandgap. |
Use Scenario: LoRaWAN environmental sensor node sleeping for 99% of time, waking periodically to sample and transmit data. IC Role / Device Role / Timing Role: Ensures clean µP wake-up by holding reset until 3.3V rail stabilizes post-LDO startup, preventing boot failures. Use Value: 100µA supply current extends 10-year battery life target; 200ms reset pulse accommodates slow-starting RF front-end biasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCUA | Single active-low RESET output only; no RESET; includes watchdog timer (1.6s timeout) | Requires external inverter for active-high reset; adds software watchdog dependency | Select when watchdog supervision is required and dual-reset signaling is unnecessary |
| TPS3808G12DBVR | Single active-low reset; 1.2V threshold; 200ms delay; 1.6µA IQ; no PFI/PFO | Lacks power-fail comparator; lower supply current but no early-warning capability | Select for ultra-low-power applications where only basic reset is needed and PFI functionality is omitted |
Compared with MAX706RCUA, MAX708RCUA trades watchdog functionality for dual-reset flexibility and eliminates PFI-related complexity; compared with TPS3808G12DBVR, it adds critical power-fail warning and higher reset threshold accuracy at modest IQ cost-making it optimal for instrumentation requiring both reliability and diagnostic visibility.
Availability
MAX708RCUA is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controllers, medical handsets, and network edge sensors requiring stable component supply with guaranteed long-term availability.
Supply support for MAX708RCUA 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 demanding industrial, medical, and communications applications.
The MAX708 family targets cost-sensitive, space-constrained embedded systems needing deterministic power-supply monitoring with minimal external components and guaranteed behavior across wide voltage/temperature ranges.
FAQ
What is the reset threshold voltage for MAX708RCUA?
The MAX708RCUA has a factory-trimmed reset threshold of 2.63V (VCC falling), with ±1.5% tolerance over temperature. This value is specified in the Electrical Characteristics table and applies to both RESET and RESET outputs. The threshold ensures reliable reset activation before 3.3V microprocessors enter undefined operational states, and is distinct from the 1.25V internal reference used for the PFI comparator.
Does MAX708RCUA include a watchdog timer function?
No, the MAX708RCUA does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family replaces the WDI/WDO pins with a second reset output (RESET). The datasheet explicitly states that MAX708R/S/T devices "provide both RESET and RESET outputs" and "do not have a watchdog timer." This makes MAX708RCUA suitable for systems requiring dual-reset signaling without software-dependent supervision.
How does the power-fail comparator work on MAX708RCUA?
The MAX708RCUA's power-fail comparator uses a fixed 1.25V internal reference applied to the inverting input. The non-inverting input is the externally accessible PFI pin. When the voltage at PFI falls below 1.25V, the open-drain PFO output pulls low. Users configure the trip point by connecting PFI to a resistive divider across the supply being monitored-enabling early-warning detection of unregulated rail collapse before the main VCC drops.
What is the minimum VCC level at which MAX708RCUA guarantees reset assertion?
The MAX708RCUA guarantees RESET and RESET assertion down to VCC = 1V, as confirmed in the datasheet's "RESET and RESET Outputs" section and Absolute Maximum Ratings. This behavior ensures deterministic reset even during deep brownout conditions where other supervisors may release reset prematurely, preventing undefined µP states in safety-critical or data-integrity-sensitive applications.
Can MAX708RCUA be used with a 5V supply?
Yes, the MAX708RCUA operates across VCC = 1.2V to 5.5V and is fully specified for 5V operation. Its reset threshold remains 2.63V regardless of supply voltage, and output drive strength improves at higher VCC (e.g., RESET sinks 3.2mA at VCC = 5V). The device maintains 200ms reset pulse width and 1.25V PFI reference accuracy across the full range, making it suitable for mixed-voltage systems.
MAX708RCUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX708RCUA FAQ
1.How can I place an order for MAX708RCUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708RCUA 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 MAX708RCUA reliable?
The price and inventory of MAX708RCUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708RCUA is usually 5 days.
3.What payment methods are accepted for MAX708RCUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708RCUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708RCUA?
MAX708RCUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708RCUA 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 MAX708RCUA?
For technical support, including MAX708RCUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708RCUA requirements.
6.How does Aetrix verify that MAX708RCUA is sourced from the original manufacturer or authorized distributors?
All MAX708RCUA 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 MAX708RCUA meets industry standards.
7.What is the process for return or replacement of MAX708RCUA?
All MAX708RCUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708RCUA, 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 MAX708RCUA part is unused and in its original packaging.
Return procedure for MAX708RCUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX708RCUA Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
