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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX696CWE

Name: MAX696CWE
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX696CWE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX696CWE

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: 16-SOIC (0.295", 7.50mm Width)

Datasheet:: MAX696CWE.pdf

Description:: IC SUPERVISOR 2 CHANNEL 16SOIC

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Product details

Overview

MAX696CWE from Maxim Integrated is a microprocessor supervisory circuit in 16-pin wide SOIC package, providing adjustable low-line reset (1.25V–1.35V), watchdog timer (100ms/1.6s), power-fail warning (1.3V PFI threshold), battery-backup switching (VOUT up to 50mA), and active-high/active-low RESET outputs - used for reliable power monitoring and RAM backup in industrial controllers and embedded systems.

For engineers reviewing the MAX696CWE datasheet, MAX696CWE pinout, MAX696CWE application, or MAX696CWE equivalent, key selection considerations include its C-grade temperature range (0°C to +70°C), integrated battery switchover with 1μA standby current in backup mode, dual reset outputs, and configurable watchdog timing via OSC SEL/OSC IN pins.

Technical Context

The MAX696CWE integrates six core functions: precision 1.3V comparator-based low-line reset generator with 50ms default timeout; dual-mode watchdog timer (internal oscillator or external clock/capacitor); independent PFI/PFO power-fail detection; BATT ON-controlled external pnp transistor drive; VOUT battery-switchover with 200Ω MOSFET; and RESET/RESET complementary outputs with internal 3μA pullup.

Its architecture supports system-level reliability through hysteresis-enabled brownout detection (12mV on LLIN), switchover hysteresis (20mV), and watchdog fault recovery with automatic pulse retriggering. The device operates across 3.0V–5.5V VCC and 2.0V–(VCC−0.3V) VBATT, with supply current under 4mA in VCC mode and ≤1μA in full battery-backup mode.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Operating Range	3.0V to 5.5V - compatible with standard +5V microprocessor rails and tolerant of nominal 3.3V logic interfaces.
Low-Line Threshold	1.25V to 1.35V - precise 1.3V reference enables reliable brownout detection before microprocessor malfunction.
Reset Timeout Delay	35ms to 70ms (typ 50ms) - ensures sufficient hold time for microprocessor oscillator startup and initialization.
Watchdog Timeout	100ms or 1.6s (selectable) - provides flexible software execution monitoring without requiring external timing components.
Battery-Backup Current	≤1μA max (VBATT mode) - extends lithium coin-cell life for years in CMOS RAM backup applications.
VOUT Output Capability	50mA at VCC − 0.5V - directly powers small SRAMs or RTCs; supports external pnp boost via BATT ON signal.
PFI Threshold Accuracy	±50mV (1.2V–1.4V) - enables early power-fail warning by monitoring unregulated DC input prior to regulator dropout.

Pinout & Package

MAX696CWE is housed in a 16-pin wide SOIC (SO) package with 1.27mm pitch, RoHS-compliant lead-free option available (add '+' suffix). Pin 12 is No Connection (N.C.), and all pins are electrically validated per Maxim's official pin description table.

Pin/Terminal	Circuit Role	Design Meaning
1 VBATT	Backup-battery input	Connects to lithium cell or capacitor; enables automatic switchover when VCC drops below VBATT − 70mV.
2 VOUT	Switchover output	Delivers higher of VCC or VBATT; supplies up to 50mA to CMOS RAM during main power loss.
3 VCC	Main supply input	+5V system rail input; powers internal circuitry and defines operating voltage domain.
4 GND	Ground reference	Common 0V return for all analog/digital functions; must be low-impedance for reset stability.
5 BATT ON	Battery-enable control	Active-low open-drain output; sinks 7mA to drive base of external pnp transistor for >50mA loads.
6 LOW LINE	Low-voltage indicator	Active-low comparator output signaling LLIN < 1.3V; used for status LEDs or interrupt generation.
7 OSC IN	Oscillator timing input	Accepts external clock or capacitor (e.g., 47pF → ~4kHz) to configure reset/watchdog timing.
8 OSC SEL	Oscillator mode select	High/floating = internal oscillator (10.24kHz); low = external clock/capacitor timing source.
9 PFI	Power-fail input	Noninverting input to 1.3V comparator; monitors regulated/unregulated supply via resistor divider.
10 PFO	Power-fail output	Active-low NMI trigger; asserts when PFI < 1.3V, enabling data save before system reset.
11 WDI	Watchdog input	Three-level input (low/mid/high); toggling resets watchdog; floating disables timer.
12 N.C.	No connection	Must remain unconnected; no internal bond or function.
13 LLIN	Low-line sense input	CMOS input to 1.3V comparator; connected to voltage divider from VCC for brownout detection.
14 WDO	Watchdog output	Active-low fault flag; stays low until WDI transition occurs while RESET is high.
15 RESET	Active-low reset output	Drives microprocessor /RESET pin; 50ms pulse on brownout or watchdog timeout; 3μA internal pullup.
16 RESET	Active-high reset output	Inverted complement of RESET; drives logic-level reset inputs or status indicators directly.

Key Features

Feature	Design Value
Adjustable low-line reset threshold	Configured via external resistor divider on LLIN; 1.3V ±50mV accuracy enables precise brownout margining.
Integrated battery switchover	VOUT automatically selects VBATT when VCC falls below VBATT − 70mV; 200Ω MOSFET ensures <100mV dropout.
Dual watchdog timing modes	Selectable 100ms or 1.6s timeout via OSC SEL/OSC IN; long timeout after reset prevents false triggers during boot.
Power-fail warning with hysteresis support	PFI/PFO pair allows early NMI assertion; external resistor feedback adds programmable hysteresis (e.g., 1.23V).
Ultra-low battery-backup current	≤1μA max supply current when VCC = 0V and VBATT = 2.8V - enables >10-year coin-cell lifetime in memory backup.

Applications

Industrial Controller Power Monitoring	Embedded Data Logger with RAM Backup
Use Scenario: PLC or RTU maintaining real-time state during AC line sags or brownouts. IC Role / Device Role / Timing Role: MAX696CWE monitors VCC, asserts RESET if voltage drops below 1.3V, and switches VOUT to VBATT to sustain SRAM and RTC operation. Use Value: Prevents firmware corruption and preserves critical process data across brief power interruptions without external supervision logic.	Use Scenario: Battery-backed environmental sensor node logging temperature/humidity to CMOS SRAM. IC Role / Device Role / Timing Role: MAX696CWE provides VOUT-powered RAM retention, PFO-triggered NMI for last-minute data save, and watchdog supervision of firmware execution. Use Value: Enables deterministic data persistence during main power loss and detects firmware hangs that could corrupt stored logs.
Medical Diagnostic Equipment	Point-of-Sale Terminal with Secure Memory
Use Scenario: Portable ultrasound or ECG unit requiring fail-safe power sequencing and memory integrity. IC Role / Device Role / Timing Role: MAX696CWE delivers synchronized RESET/RESET signals, monitors unregulated DC input via PFI for early warning, and maintains RAM during battery-only operation. Use Value: Meets IEC 60601-1 requirements for safe power-down behavior and ensures patient data retention during unexpected shutdown.	Use Scenario: Retail terminal storing transaction buffers and encryption keys in battery-backed SRAM. IC Role / Device Role / Timing Role: MAX696CWE uses LLIN to detect brownout, triggers PFO-driven NMI to flush buffers, and sustains VOUT to prevent write corruption during power transition. Use Value: Guarantees atomic write completion and cryptographic key preservation even during rapid AC loss events.

Industrial Controller Power Monitoring

Embedded Data Logger with RAM Backup

Use Scenario: PLC or RTU maintaining real-time state during AC line sags or brownouts.

IC Role / Device Role / Timing Role: MAX696CWE monitors VCC, asserts RESET if voltage drops below 1.3V, and switches VOUT to VBATT to sustain SRAM and RTC operation.

Use Value: Prevents firmware corruption and preserves critical process data across brief power interruptions without external supervision logic.

Use Scenario: Battery-backed environmental sensor node logging temperature/humidity to CMOS SRAM.

IC Role / Device Role / Timing Role: MAX696CWE provides VOUT-powered RAM retention, PFO-triggered NMI for last-minute data save, and watchdog supervision of firmware execution.

Use Value: Enables deterministic data persistence during main power loss and detects firmware hangs that could corrupt stored logs.

Medical Diagnostic Equipment

Point-of-Sale Terminal with Secure Memory

Use Scenario: Portable ultrasound or ECG unit requiring fail-safe power sequencing and memory integrity.

IC Role / Device Role / Timing Role: MAX696CWE delivers synchronized RESET/RESET signals, monitors unregulated DC input via PFI for early warning, and maintains RAM during battery-only operation.

Use Value: Meets IEC 60601-1 requirements for safe power-down behavior and ensures patient data retention during unexpected shutdown.

Use Scenario: Retail terminal storing transaction buffers and encryption keys in battery-backed SRAM.

IC Role / Device Role / Timing Role: MAX696CWE uses LLIN to detect brownout, triggers PFO-driven NMI to flush buffers, and sustains VOUT to prevent write corruption during power transition.

Use Value: Guarantees atomic write completion and cryptographic key preservation even during rapid AC loss events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX697CWE	Lacks VBATT/VOUT/BATT ON pins; adds CE IN/CE OUT for RAM write protection; consumes <250µA (vs. 4mA typical in VCC mode for MAX696CWE).	Suitable where battery backup is unnecessary but CMOS RAM write gating is required - e.g., systems using external backup regulators.	Select MAX697CWE when write-protection functionality outweighs battery switchover need and lower quiescent current is critical.
TPS3823DBVR	Single VDD supervisor (no battery switchover); fixed 2.93V reset threshold; no watchdog or PFI; SOT-23-5 package.	Applicable only for basic reset generation in space-constrained designs without multi-rail or fault-detection requirements.	Choose TPS3823DBVR only for simple +3.3V systems needing minimal footprint and no advanced supervision features.

Compared with MAX697CWE and TPS3823DBVR, the MAX696CWE uniquely combines battery switchover, dual reset outputs, watchdog timer, and power-fail warning in one 16-pin SOIC - making it irreplaceable for applications requiring coordinated power-loss response and memory retention without external discrete circuitry.

Availability

MAX696CWE is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic equipment, and point-of-sale terminals requiring stable component supply across extended production lifecycles.

Supply support for MAX696CWE 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, communications, and computing markets.

The MAX696CWE belongs to Maxim's microprocessor supervisory product line, designed specifically to replace discrete reset generators, battery switchover circuits, and watchdog timers in resource-constrained embedded systems.

FAQ

What is the operating temperature range for the MAX696CWE?

The MAX696CWE is rated for 0°C to +70°C (C-grade), as confirmed in the Ordering Information table. This makes it suitable for commercial and industrial indoor applications where ambient temperatures remain within this envelope. It is not rated for extended temperature operation like the E-grade (−40°C to +85°C) or M-grade (−55°C to +125°C) variants.

Does the MAX696CWE support both active-high and active-low reset outputs?

Yes, the MAX696CWE provides both RESET (active-low) and RESET (active-high) outputs on pins 15 and 16 respectively. These are complementary signals with internal 3μA pullup on RESET, allowing direct interface to microprocessors requiring either polarity without external components.

How does the battery switchover function work in the MAX696CWE?

The MAX696CWE compares VCC and VBATT internally and connects the higher voltage to VOUT via a low-dropout pnp transistor (VCC mode) or 200Ω MOSFET (battery mode). Switchover occurs at VCC = VBATT − 70mV (rising) and VCC = VBATT − 50mV (falling), with 20mV hysteresis to prevent chatter near threshold.

Can the watchdog timeout period of the MAX696CWE be adjusted, and how?

Yes, the MAX696CWE supports three watchdog timeout configurations: 100ms (OSC SEL high, OSC IN low), 1.6s (OSC SEL high/floating, OSC IN floating), or user-adjustable via external capacitor on OSC IN (e.g., 47pF yields ~1.6s). External clock input is also supported when OSC SEL is low.

What is the maximum load current supported by the VOUT pin of the MAX696CWE?

The VOUT pin of the MAX696CWE delivers up to 50mA with a typical dropout of VCC − 0.25V at 50mA. For higher currents or lower dropout, the BATT ON output can drive an external pnp transistor in parallel with the internal switch, extending capability beyond 50mA while maintaining low saturation voltage.

MAX696CWE Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 16-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 2

Voltage - Threshold:: Adjustable/Selectable

Output:: Push-Pull, Push-Pull

Reset:: Active High/Active Low

Reset Timeout:: 35ms Minimum

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

MAX696CWE FAQ

1.How can I place an order for MAX696CWE through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX696CWE 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 MAX696CWE reliable?

The price and inventory of MAX696CWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX696CWE is usually 5 days.

3.What payment methods are accepted for MAX696CWE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX696CWE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX696CWE?

MAX696CWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX696CWE 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 MAX696CWE?

For technical support, including MAX696CWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX696CWE requirements.

6.How does Aetrix verify that MAX696CWE is sourced from the original manufacturer or authorized distributors?

All MAX696CWE 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 MAX696CWE meets industry standards.

7.What is the process for return or replacement of MAX696CWE?

All MAX696CWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX696CWE, 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 MAX696CWE part is unused and in its original packaging.

Return procedure for MAX696CWE:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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