My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX690AESA/GG8
- Part No.:
- MAX690AESA/GG8
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX690AESA/GG8.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,300
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX690AESA/GG8 from Maxim Integrated is a microprocessor supervisory circuit providing precision reset generation, battery-backup switchover, watchdog timer, and power-fail detection for +5V systems. It asserts an active-low RESET pulse (200ms width) when VCC drops below 4.65V, switches VOUT to VBATT during brownout with 40mV hysteresis, monitors PFI against 1.25V reference, and triggers reset if WDI remains static for 1.6s - used in battery-powered controllers requiring reliable μP startup and data retention.
For engineers reviewing the MAX690AESA/GG8 datasheet, MAX690AESA/GG8 pinout, MAX690AESA/GG8 application, or MAX690AESA/GG8 equivalent, key selection criteria include guaranteed RESET assertion down to VCC = 1V, 50nA quiescent current in battery-backup mode, ±2% power-fail accuracy (shared with MAX802L), and compatibility with lithium backup batteries up to 4.80V.
Technical Context
The MAX690AESA/GG8 integrates four independent functional blocks: a precision voltage monitor with 4.65V threshold and 40mV hysteresis, a 1.6s watchdog timer cleared by WDI edges or RESET assertion, a battery switchover circuit using dual PMOS switches (5Ω for VCC→VOUT, 80Ω for VBATT→VOUT), and a 1.25V reference-based power-fail comparator driving open-drain PFO.
Its internal architecture guarantees RESET remains low until VCC rises above 4.65V and holds for 200ms thereafter; during backup mode, supply current drops to <1μA when VCC is >1V below VBATT, and PFO is forced low while VBATT powers the IC - enabling ultra-low-power RAM retention in industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±50mV - ensures reliable μP reset before +5V rail collapse affects logic integrity |
| Reset Pulse Width | 200ms typical - meets minimum reset hold time for Intel 80C51 and compatible microcontrollers |
| Watchdog Timeout | 1.6s ±0.65s - provides sufficient window for firmware servicing without false triggering |
| Quiescent Current (VCC active) | 200–500µA - enables continuous monitoring in always-on embedded systems |
| Quiescent Current (VBATT only) | 50nA typical, ≤5.0µA max - preserves lithium battery life for >10 years in standby |
| Power-Fail Accuracy | ±2% at +25°C - supports precise early-warning detection of regulated +5V supply degradation |
| VOUT Switch Resistance | 5Ω (VCC→VOUT), 80Ω (VBATT→VOUT) - limits voltage drop to <25mV at 5mA, preserving CMOS RAM VDD margin |
Pinout & Package
MAX690AESA/GG8 is housed in an 8-pin SOIC package (SO) with standard 1.27mm pitch, RoHS-compliant, moisture sensitivity level 1, and rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC and VBATT based on reset threshold crossing; delivers regulated +5V or backup battery with minimal dropout |
| 2 - VCC | +5V main supply input | Primary power source; monitored for reset assertion and used as substrate reference |
| 3 - GND | Analog/digital ground | Common return for all internal circuits; must be low-impedance to ensure accurate voltage monitoring |
| 4 - PFI | Power-fail comparator input | Accepts external voltage divider signal; compares to 1.25V internal reference to trigger PFO low |
| 5 - PFO | Power-fail open-drain output | Active-low interrupt signal to μP; disabled and forced low during VBATT backup mode |
| 6 - WDI | Watchdog timer input | Edge-sensitive; floating or high-Z state disables watchdog; 50ns minimum pulse width detectable |
| 7 - RESET | Active-low reset output | Push-pull output asserted low for 200ms during power-up/down/brownout/watchdog timeout |
| 8 - VBATT | Backup battery input | Connects to lithium cell (3.0–3.6V); enables automatic switchover when VCC falls 20mV below VBATT |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic μP initialization even during severe brownout conditions where rail sags below logic thresholds |
| Battery switchover hysteresis | 40mV prevents oscillation during slow VCC decay, eliminating repeated RAM supply toggling and data corruption |
| Power-fail comparator disable in backup mode | Reduces total current draw to <1μA when VBATT powers the IC, extending battery life in long-term storage applications |
| WDI input biasing | Internally biased to 35% VCC with 50kΩ impedance - eliminates need for external pull-up/down resistors in most designs |
| Reset pulse timing independence | 200ms width is internally generated and unaffected by VCC slew rate or temperature, ensuring consistent μP behavior |
Applications
| Battery-Powered Controllers | Critical μP Power Monitoring |
|---|---|
Use Scenario: Industrial programmable logic controller (PLC) retains real-time clock and configuration EEPROM during AC mains failure using a 3.6V lithium coin cell. IC Role / Device Role / Timing Role: MAX690AESA/GG8 monitors +5V DC/DC output, asserts RESET to halt μP execution, and switches VOUT to VBATT to sustain RAM and RTC. Use Value: Prevents data loss and system crash with guaranteed 200ms reset hold and <1μA backup current - enabling >10-year battery life. | Use Scenario: Medical infusion pump performs self-test and safety lockout during power-up and detects undervoltage on its isolated +5V analog supply. IC Role / Device Role / Timing Role: MAX690AESA/GG8 generates power-on reset, monitors PFI from analog supply divider, and triggers PFO interrupt before rail collapse compromises ADC accuracy. Use Value: Achieves IEC 62304 Class C compliance via ±2% power-fail accuracy and deterministic 4.65V reset threshold. |
| Intelligent Instruments | Embedded Data Loggers |
Use Scenario: Portable gas analyzer samples sensor data continuously and stores results in SRAM during field deployment with intermittent charging. IC Role / Device Role / Timing Role: MAX690AESA/GG8 watches WDI for firmware heartbeat, asserts RESET on software hang, and maintains VOUT from VBATT during charging gaps. Use Value: Eliminates need for external watchdog IC and discrete switchover MOSFET, reducing BOM count by 3 components. | Use Scenario: Environmental sensor node records temperature/humidity every 10 seconds and retains last 1000 readings in battery-backed SRAM. IC Role / Device Role / Timing Role: MAX690AESA/GG8 provides brownout reset, enables low-battery warning via PFI monitoring, and sustains memory during 72-hour power outage. Use Value: Delivers 50nA backup quiescent current - extending CR2032 battery life from 3 months to >5 years in deep-sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802LESA | Identical reset threshold (4.65V), same 200ms reset pulse, ±2% power-fail accuracy guaranteed over full temp range | No watchdog timer; lacks WDI pin and timeout functionality | Select MAX802LESA when watchdog supervision is unnecessary and lowest possible cost is required |
| MAX805LESA | Same pinout and electrical specs, but provides active-high RESET output instead of active-low | Designed for μPs requiring high-true reset (e.g., Intel 80C51); RESET output valid down to VCC = 1.1V | Select MAX805LESA when interfacing with legacy microcontrollers mandating active-high reset assertion |
Compared with MAX802LESA, MAX690AESA/GG8 adds watchdog supervision at no pin-count or layout penalty; compared with MAX805LESA, it offers active-low reset polarity optimized for modern ARM Cortex-M and RISC-V MCUs with open-drain reset inputs.
Availability
MAX690AESA/GG8 is available at Aetrix Electronics and suitable for battery-powered controllers, intelligent instruments, critical μP power monitoring, and embedded data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX690AESA/GG8 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 high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX690AESA/GG8 belongs to Maxim's μP supervisory circuit product line, designed specifically to replace discrete reset generators, battery switchover diodes, and watchdog timers in space-constrained embedded systems.
FAQ
What is the operating temperature range for the MAX690AESA/GG8?
The MAX690AESA/GG8 is rated for operation from -40°C to +85°C. This extended industrial temperature range ensures reliable performance in harsh environments such as factory automation equipment, outdoor instrumentation, and transportation control systems. The device maintains specified reset threshold accuracy, watchdog timeout, and quiescent current across this full range, as validated in Maxim's Electrical Characteristics table under "MAX69_AE/M" conditions.
Does the MAX690AESA/GG8 support active-high reset output?
No, the MAX690AESA/GG8 provides only an active-low RESET output. For active-high reset functionality, use the pin-compatible MAX805LESA, which shares identical packaging, reset threshold, and timing but inverts the RESET signal. The MAX690AESA/GG8 RESET pin is push-pull and asserts low for 200ms during power-up, brownout, or watchdog timeout - matching interface requirements of most ARM Cortex-M and PIC microcontrollers.
How does the MAX690AESA/GG8 handle battery switchover during power failure?
The MAX690AESA/GG8 uses a dual-PFET architecture: a 5Ω switch connects VCC to VOUT during normal operation, and an 80Ω switch engages only when VCC falls below 4.65V and VBATT exceeds VCC by ≥20mV. Switchover hysteresis is 40mV to prevent oscillation. During backup mode, internal circuitry powers from VBATT, reducing quiescent current to <1μA when VCC is >1V below VBATT - preserving lithium battery life for years.
Can the MAX690AESA/GG8 monitor negative supply rails?
Yes, the MAX690AESA/GG8's PFI input can monitor negative voltages using an external resistor network (Figure 7 in the datasheet). By referencing PFI to ground and applying a scaled version of the negative rail through a voltage divider, the 1.25V internal comparator detects degradation when the negative rail magnitude decreases. Accuracy depends on resistor tolerance and PFI input current (≤25nA), so 1% metal-film resistors are recommended for ±5% trip-point stability.
What is the maximum allowable backup battery voltage for the MAX690AESA/GG8?
The maximum allowable backup battery voltage for the MAX690AESA/GG8 is 4.80V, as specified in Table 2 of the datasheet. Exceeding this voltage risks forward-biasing the internal substrate diode (D1 in Figure 3) when VCC is near the reset threshold, causing unintended current flow from VBATT to VCC and potential latch-up. Lithium cells with 3.0V–3.6V open-circuit voltage are ideal; higher-voltage sources require series regulation or clamping.
MAX690AESA/GG8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX690AESA/GG8 FAQ
1.How can I place an order for MAX690AESA/GG8 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX690AESA/GG8 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 MAX690AESA/GG8 reliable?
The price and inventory of MAX690AESA/GG8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX690AESA/GG8 is usually 5 days.
3.What payment methods are accepted for MAX690AESA/GG8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX690AESA/GG8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX690AESA/GG8?
MAX690AESA/GG8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX690AESA/GG8 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 MAX690AESA/GG8?
For technical support, including MAX690AESA/GG8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX690AESA/GG8 requirements.
6.How does Aetrix verify that MAX690AESA/GG8 is sourced from the original manufacturer or authorized distributors?
All MAX690AESA/GG8 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 MAX690AESA/GG8 meets industry standards.
7.What is the process for return or replacement of MAX690AESA/GG8?
All MAX690AESA/GG8 units undergo pre-shipment inspection (PSI). If there is an issue with MAX690AESA/GG8, 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 MAX690AESA/GG8 part is unused and in its original packaging.
Return procedure for MAX690AESA/GG8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX690AESA/GG8 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…
