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Analog Devices Inc./Maxim Integrated MAX696CWE+
- 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
- Quantity:
- Payment:
- Shipping:
Inventory:4,125
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Product details
Overview
MAX696CWE+ from Maxim Integrated is a microprocessor supervisory circuit in 16-pin wide SOIC package, providing six integrated functions: adjustable low-line reset (1.25V–1.35V threshold), watchdog timer (100ms/1.6s selectable), power-fail warning (1.3V PFI threshold), reset timeout delay (50ms default), battery-backup switching (VOUT switchover between VCC and VBATT), and BATT ON control output. It is used in embedded controllers and industrial instrumentation for reliable μP power monitoring and RAM backup.
For engineers reviewing the MAX696CWE+ datasheet, MAX696CWE+ pinout, MAX696CWE+ application, or MAX696CWE+ equivalent, key selection considerations include its 0°C to +70°C temperature grade, 3.0V–5.5V VCC operating range, 1μA battery-standby current, 50mA VOUT sourcing capability, and explicit support for CMOS RAM backup with automatic switchover at 50mV–70mV VCC–VBATT differential.
Technical Context
The MAX696CWE+ integrates a precision 1.3V bandgap reference shared across LLIN, PFI, and internal comparators, enabling simultaneous low-line detection, power-fail warning, and reset generation. Its dual-mode oscillator-internal 10.24kHz or external capacitor/clock-controlled-drives both the 50ms reset monostable and the watchdog counter with configurable timeout periods.
Reset assertion occurs on three independent conditions: LLIN < 1.3V (with 12mV hysteresis), watchdog timeout (after WDI inactivity), or VCC falling below VBATT by >50mV. Battery switchover uses an internal 200Ω p-channel MOSFET and a dedicated BATT ON open-drain output capable of sinking 7mA to drive external pass transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 3.0V to 5.5V - supports standard 3.3V and 5V μP systems without level-shifting. |
| Low-Line Threshold | 1.25V to 1.35V - precise 1.3V nominal comparator input for reliable power-up/down reset triggering. |
| Reset Timeout Delay | 35ms to 70ms (typ 50ms) - ensures μP clock stabilization before release; adjustable via OSC IN capacitor or clock. |
| Watchdog Timeout | 100ms or 1.6s (selectable) - provides fail-safe software execution monitoring with post-reset extension. |
| Battery-Backup Current | ≤1μA max (VCC = 0V, VBATT = 2.8V) - enables multi-year CMOS RAM retention on coin-cell batteries. |
| VOUT Output Capability | 50mA @ VCC − 0.5V - directly powers small RAM/RTC loads; extended current possible via BATT ON-driven external PNP. |
| PFI Threshold Accuracy | ±50mV (1.2V–1.4V) - allows early power-fail warning when monitoring unregulated rails ahead of VCC collapse. |
Pinout & Package
MAX696CWE+ is housed in a 16-pin wide SOIC (SO) package, 7.5mm × 10.3mm body, 1.27mm pitch, RoHS-compliant lead-free construction (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Backup-battery input | Connects to 2.0V–4.25V battery; enables automatic switchover to VOUT when VCC drops below VBATT − 50mV. |
| 2 VOUT | Switched output supply | Delivers higher of VCC or VBATT; sources up to 50mA; powers CMOS RAM during main power loss. |
| 3 VCC | Main supply input | 3.0V–5.5V primary power rail; powers internal circuitry and determines reset timing thresholds. |
| 4 GND | Ground reference | Common return for all analog/digital signals; must be low-impedance for stable comparator operation. |
| 5 BATT ON | Battery-active indicator | Open-drain output sinks 7mA when VOUT is sourced from VBATT; drives base of external PNP for >50mA loads. |
| 6 LOW LINE | Low-voltage fault flag | Active-low signal asserted when LLIN < 1.3V; used for system-level brownout indication or interrupt generation. |
| 7 OSC IN | Oscillator timing input | Accepts external capacitor (e.g., 47pF → ~4kHz) or clock signal to configure reset/watchdog timing. |
| 8 OSC SEL | Oscillator mode select | High/floating → internal oscillator; low → external timing source; internal 3µA pullup simplifies control. |
| 9 PFI | Power-fail input | Noninverting input to 1.3V comparator; monitors auxiliary rail (e.g., unregulated DC) for pre-failure warning. |
| 10 PFO | Power-fail output | Active-low NMI signal triggered when PFI < 1.3V; comparator disabled if VCC < VBATT to conserve battery. |
| 11 WDI | Watchdog input | Three-level input (low/mid/high); toggling required every 100ms or 1.6s; floating disables watchdog. |
| 12 N.C. | No connection | Pin 12 is unconnected internally; must remain open; not usable as spare I/O or ground. |
| 13 LLIN | Low-line sense input | CMOS input to 1.3V comparator; externally biased via resistor divider from VCC to set reset threshold. |
| 14 WDO | Watchdog output | Active-low fault flag; goes low on WDI timeout; resets high on next WDI transition while RESET is high. |
| 15 RESET | Active-low reset output | Drives μP reset pin low for ≥50ms on brownout, watchdog fault, or VCC–VBATT switchover. |
| 16 RESET | Active-high reset output | Inverted complement of RESET; eliminates need for external inverter in active-high reset architectures. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable low-line reset threshold | Set via external resistor divider on LLIN; factory-trimmed 1.3V reference ensures ±50mV accuracy over temp. |
| Dual-mode watchdog timer | Selectable 100ms/1.6s timeout using OSC SEL and OSC IN; includes post-reset extension to prevent false triggers. |
| Integrated battery switchover | Internal 200Ω MOSFET + BATT ON driver enables seamless RAM backup with <1μA quiescent current in battery mode. |
| Independent power-fail detection | Dedicated PFI/PFO path with 1.3V threshold allows early warning from unregulated supplies, decoupled from VCC monitoring. |
| Reset pulse width configurability | Default 50ms (sufficient for μP clock startup); extended via OSC IN capacitor or external clock for custom timing. |
Applications
| Industrial Controller Power Monitoring | Embedded Data Logger with RAM Backup |
|---|---|
|
Use Scenario: PLC or motion controller requiring guaranteed reset during AC line sags or brownouts. IC Role / Device Role / Timing Role: Supervisory IC asserts RESET when VCC dips below 1.3V threshold; holds reset for 50ms to ensure μP clock stability. Use Value: Prevents erratic μP behavior during transient grid events; eliminates need for discrete voltage monitor + RC reset generator. |
Use Scenario: Battery-backed data logger storing sensor readings in CMOS SRAM during mains outage. IC Role / Device Role / Timing Role: MAX696CWE+ switches VOUT from VCC to VBATT at 50mV differential and asserts BATT ON to enable external hold-up circuitry. Use Value: Enables >5-year RAM retention on CR2032 via <1μA standby current; avoids data corruption during power transitions. |
| Medical Instrument Power Integrity | Point-of-Sale Terminal with NMI Warning |
|
Use Scenario: Portable diagnostic device needing deterministic reset and memory protection during battery swap. IC Role / Device Role / Timing Role: Monitors both VCC and VBATT; generates PFO interrupt before LLIN collapse to trigger safe shutdown and data save. Use Value: Provides 2–5ms advance warning via PFI (vs. immediate LLIN failure), allowing full EEPROM write completion. |
Use Scenario: Retail terminal using nonmaskable interrupt to preserve transaction state prior to power loss. IC Role / Device Role / Timing Role: PFO output connected to μP NMI pin; triggered when unregulated 12V rail falls below 1.3V×(R1+R2)/R2 threshold. Use Value: Guarantees atomic commit of last sale record into nonvolatile memory before system reset occurs. |
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. 1.5–4mA active). | Suitable where battery backup is unnecessary but CMOS RAM write gating is required; no switchover functionality. | Select MAX697CWE+ only if write-protection logic is needed and battery switchover is omitted from design. |
| TPS3823-50DBVR | Single-function supervisor: fixed 5.0V reset threshold, no watchdog, no battery switchover, no PFI; 3-pin SOT-23 package. | Applicable only for basic reset generation in space-constrained 5V-only systems; no multi-rail monitoring or backup features. | Choose TPS3823-50DBVR only for cost-sensitive, single-threshold reset needs where MAX696CWE+ features are unused. |
Compared with MAX697CWE+, MAX696CWE+ provides essential battery switchover and VOUT delivery but omits CE gating; compared with TPS3823-50DBVR, it delivers comprehensive supervision (reset, watchdog, PFI, switchover) at the cost of larger footprint and higher active current.
Availability
MAX696CWE+ is available at Aetrix Electronics and suitable for industrial controllers, medical instrumentation, embedded data loggers, and point-of-sale terminals requiring stable component supply across commercial temperature range (0°C to +70°C) with lead-free compliance.
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) designs precision analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration for embedded systems.
The MAX696CWE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically to consolidate reset, watchdog, power-fail warning, and battery backup functions into a single 16-pin IC for μP-based equipment requiring high uptime and data integrity.
FAQ
What is the operating temperature range of the MAX696CWE+?
The MAX696CWE+ is specified for 0°C to +70°C ambient operation, denoted by the 'C' suffix in the part number. This commercial-grade rating makes it suitable for indoor industrial controllers, consumer electronics, and office equipment where extended temperature performance is not required. The '+' suffix confirms RoHS-compliant lead-free packaging per Maxim's ordering convention.
Does the MAX696CWE+ support adjustable reset timeout delay?
Yes, the MAX696CWE+ supports adjustable reset timeout delay. By default, it provides a 50ms reset pulse, but this can be modified using the OSC IN and OSC SEL pins: connecting an external capacitor (e.g., 47pF) to OSC IN yields ~400ms delay, while applying an external clock signal allows precise cycle-based timing. The MAX696CWE+ datasheet Table 1 documents all valid configurations and resulting delays.
How does the battery switchover function work in the MAX696CWE+?
The MAX696CWE+ performs automatic battery switchover by comparing VCC and VBATT voltages. When VCC falls below VBATT minus 50mV, it disconnects VCC from VOUT and connects VBATT via an internal 200Ω p-channel MOSFET. Simultaneously, BATT ON goes high to drive external transistor bases. In this mode, MAX696CWE+ draws ≤1μA from VBATT, enabling long-term CMOS RAM backup without external circuitry.
Can the MAX696CWE+ generate a power-fail interrupt before system reset?
Yes, the MAX696CWE+ provides a dedicated power-fail interrupt via the PFO pin. By connecting PFI to a voltage divider from an unregulated rail (e.g., rectified AC input), the 1.3V comparator triggers PFO low several milliseconds before VCC collapses enough to assert RESET. This gives the μP time to execute a controlled shutdown and save critical data-functionality confirmed in MAX696CWE+ Typical Applications Figure 1 and Applications Information section.
What is the maximum load current supported by the VOUT pin of the MAX696CWE+?
The VOUT pin of the MAX696CWE+ supports up to 50mA continuous output current when sourced from VCC, with a typical dropout voltage of VCC − 0.5V at that load. For higher currents or lower dropout, the BATT ON output can sink 7mA to drive the base of an external pnp transistor, effectively extending VOUT capability beyond 50mA. This dual-stage delivery architecture is explicitly detailed in the MAX696CWE+ Pin Description and Typical Operating Circuit sections.
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:
- Active
- 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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