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Analog Devices Inc./Maxim Integrated MAX696EWE+T
- Part No.:
- MAX696EWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX696EWE+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,579
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Product details
Overview
MAX696EWE+T from Maxim Integrated is a -40°C to +85°C industrial-grade microprocessor supervisory circuit in 16-pin wide SO package, integrating adjustable low-line reset (1.25–1.35V threshold), watchdog timer (100ms/1.6s selectable), power-fail warning (1.3V PFI comparator), battery-backup switching (VOUT up to 50mA), and active-high/lower RESET outputs. It serves as primary power-monitoring and fault-recovery IC in embedded controllers requiring reliable brownout detection and RAM backup.
For engineers reviewing the MAX696EWE+T datasheet, MAX696EWE+T pinout, MAX696EWE+T application, or MAX696EWE+T equivalent, key selection criteria include its dual-supply switchover capability (VBATT/VCC), guaranteed 1μA battery-standby current, 50ms default reset timeout, and compatibility with CMOS RAM write-protection via external logic - all validated for extended-temperature industrial operation.
Technical Context
The MAX696EWE+T implements a precision 1.30V bandgap reference shared across LLIN, PFI, and internal comparators, enabling simultaneous low-line monitoring, power-fail warning, and reset generation with ±15mV PFI–LLIN threshold matching. Its dual-mode oscillator supports internal timing (10.24kHz) or external capacitor-controlled watchdog periods (e.g., 400ms/47pF).
Battery switchover uses a pnp transistor for VCC-to-VOUT connection and a 200Ω MOSFET for VBATT-to-VOUT path, with 50mV/70mV power-down/power-up thresholds and 20mV hysteresis. The BATT ON output sinks 7mA to drive external PNP transistors, while RESET and RESET are open-drain and push-pull respectively, supporting direct CMOS interfacing without pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage (VCC) | 3.0V to 5.5V - supports standard 3.3V/5V μP rails without level-shifting. |
| Low-Line Threshold | 1.25V to 1.35V - precise 1.30V nominal comparator enables stable brownout detection at marginal supply levels. |
| Reset Timeout Delay | 35ms to 70ms (typ 50ms) - ensures microprocessor clock stabilization before release from reset. |
| Watchdog Timeout | 100ms or 1.6s (selectable) - configurable fault-detection window for software execution verification. |
| Battery Standby Current | ≤1μA max - minimizes self-discharge during long-term CMOS RAM backup. |
| VOUT Output Current | 50mA (VCC mode), 250μA (battery mode) - sufficient to power small SRAMs or RTCs directly. |
| Power-Fail Input Threshold | 1.2V to 1.4V (typ 1.3V) - allows early warning before main reset triggers, enabling graceful data save. |
Pinout & Package
MAX696EWE+T is housed in a 16-pin wide SO (SOIC-W) package with 1.27mm pitch, RoHS-compliant lead-free finish (indicated by '+' suffix), and -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Backup-battery input | Accepts 2.0V–4.25V battery; internally compared to VCC to enable automatic switchover. |
| 2 VOUT | Switched output | Delivers higher of VCC or VBATT; powers CMOS RAM directly (50mA capable). |
| 3 VCC | Main supply input | Primary 3.0V–5.5V system rail; powers all internal circuits except battery path. |
| 4 GND | Ground reference | Common return for all analog/digital functions; requires low-impedance PCB connection. |
| 5 BATT ON | Battery-active indicator | Open-drain output sinking 7mA; drives external PNP base when VBATT supplies VOUT. |
| 6 LOW LINE | Low-voltage alarm | Active-low signal asserting when LLIN < 1.3V; used for system status or interrupt generation. |
| 7 OSC IN | Oscillator timing control | Accepts external capacitor (e.g., 47pF) or clock signal to set watchdog/reset timing. |
| 8 OSC SEL | Oscillator mode select | High/floating = internal oscillator; low = external timing source (capacitor or clock). |
| 9 PFI | Power-fail input | Noninverting comparator input referenced to 1.3V; monitors unregulated DC or battery voltage. |
| 10 PFO | Power-fail output | Active-low NMI trigger; asserts before LLIN drops, enabling preemptive data storage. |
| 11 WDI | Watchdog input | Three-level input (low/mid/high); toggling resets watchdog timer; floating disables function. |
| 12 N.C. | No connection | Internally unused; must remain unconnected per datasheet. |
| 13 LLIN | Low-line sense input | CMOS input to 1.3V comparator; connected to resistor divider from VCC for reset threshold setting. |
| 14 WDO | Watchdog output | Active-low fault flag; remains low until WDI transition occurs after timeout. |
| 15 RESET | Active-low reset output | Open-drain, 400μA sink capability; compatible with shared reset buses and CMOS inputs. |
| 16 RESET | Active-high reset output | Push-pull, rail-to-rail output; drives CMOS loads directly without external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable low-line reset | 1.25–1.35V threshold with external resistor divider enables custom brownout detection for diverse supply rails. |
| Battery-backup switchover | Automatic VCC/VBATT selection with 50mV hysteresis prevents oscillation during slow supply decay. |
| Configurable watchdog timer | Selectable 100ms or 1.6s timeout via OSC SEL/OSC IN eliminates need for external timing components. |
| Integrated power-fail warning | Dedicated 1.3V PFI comparator provides earlier alert than reset trigger, allowing time-critical data save. |
| Ultra-low battery standby | ≤1μA max current in battery-backup mode extends lithium cell life beyond 10 years in typical SRAM applications. |
Applications
| Industrial Controller Power Monitoring | Embedded Data Logger with RAM Backup |
|---|---|
|
Use Scenario: PLC or RTU monitoring 24VDC field power converted to 5V/3.3V, where brownouts occur due to line surges or battery depletion. IC Role / Device Role / Timing Role: MAX696EWE+T acts as primary supervisor - detecting VCC dips below 4.2V, asserting RESET for 50ms, and triggering PFO to log fault events before shutdown. Use Value: Prevents corrupted firmware execution and ensures deterministic recovery from intermittent supply faults without manual intervention. |
Use Scenario: Battery-backed environmental sensor node storing hourly readings in 32KB SRAM during mains failure. IC Role / Device Role / Timing Role: MAX696EWE+T switches VOUT from VCC to VBATT within 10μs, maintains 50mA VOUT supply, and holds RESET low until stable battery voltage is confirmed. Use Value: Guarantees uninterrupted memory retention and eliminates data loss during 10-second AC dropout events. |
| Medical Diagnostic Equipment | Automotive Infotainment Head Unit |
|
Use Scenario: Portable ultrasound device using Li-ion battery and 3.3V μP, requiring fail-safe state preservation during rapid battery discharge. IC Role / Device Role / Timing Role: MAX696EWE+T monitors both VCC and VBATT, asserts PFO at 3.4V (pre-reset), then initiates controlled shutdown sequence before LLIN drops to 1.3V. Use Value: Enables safe EEPROM write completion and volatile buffer flush prior to full power collapse. |
Use Scenario: In-vehicle navigation system exposed to cold cranking (4.5V dips) and load dump transients, needing robust reset coordination. IC Role / Device Role / Timing Role: MAX696EWE+T generates synchronized RESET pulses on both VCC brownout and watchdog timeout, ensuring μP restarts only after stable 5V rail restoration. Use Value: Eliminates boot-loop failures caused by marginal supply conditions during engine start-stop cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX697EWE+T | Lacks VBATT/VOUT/BATT ON pins; adds CE IN/CE OUT for RAM write protection; consumes ≤250μA (vs. 1.5–7mA active current in MAX696EWE+T). | Suitable where battery backup is unnecessary but CMOS RAM write gating is required; not usable in systems needing switchover. | Select MAX697EWE+T when write-protection priority exceeds backup power needs, and supply current budget is sub-300μA. |
| TPS3823-50DBVR | Single 5.0V fixed-threshold reset IC (no watchdog, no battery switchover, no PFI); 200ms reset timeout; 12μA quiescent current. | Applicable only for basic power-on reset in non-critical 5V systems; cannot replace MAX696EWE+T's multi-function supervision. | Choose TPS3823-50DBVR only for cost-sensitive, single-rail designs where watchdog, PFI, and battery features are omitted. |
Compared with MAX697EWE+T and TPS3823-50DBVR, the MAX696EWE+T uniquely combines battery switchover, adjustable reset, and dual watchdog modes in one industrial-temperature SO package - making it irreplaceable in systems requiring coordinated power-fail response and RAM backup integrity.
Availability
MAX696EWE+T is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic equipment, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX696EWE+T 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and computing applications, emphasizing reliability, integration, and power efficiency.
The MAX696EWE+T belongs to Maxim's microprocessor supervisory product line, engineered specifically for systems requiring coordinated power monitoring, fault recovery, and nonvolatile memory backup under harsh thermal and electrical conditions.
FAQ
What is the maximum allowable voltage on the VBATT pin of the MAX696EWE+T?
The MAX696EWE+T specifies an absolute maximum rating of +6V on the VBATT pin. However, functional operation is guaranteed only between 2.0V and VCC – 0.3V (max 5.2V at VCC = 5.5V). Operating VBATT above VCC risks unintended switchover or increased leakage; for lithium batteries, stay within 2.0V–4.25V as characterized in the datasheet. Exceeding these limits may degrade long-term reliability.
Can the MAX696EWE+T generate a reset pulse shorter than 35ms?
No - the MAX696EWE+T's reset timeout is factory-trimmed with a minimum specified value of 35ms (typ 50ms, max 70ms) under standard conditions. It cannot be reduced below 35ms via external components. For faster reset assertion, consider alternative supervisors like the MAX6361 series, which offer 1.25ms min timeout. The MAX696EWE+T's timing is optimized for microprocessor oscillator stabilization, not rapid sequencing.
Does the MAX696EWE+T require external capacitors on VOUT for stability?
Yes - the MAX696EWE+T requires ≥0.1μF ceramic capacitance on the VOUT pin to ensure stability during battery switchover transients and high-current CMOS RAM switching. This capacitor supplies instantaneous peak currents (e.g., 75mA RAM spikes) while the internal 50mA regulator delivers average load current. Omitting it risks VOUT droop, reset glitches, or latch-up during switchover events.
How does the MAX696EWE+T handle watchdog timeout immediately after power-up?
The MAX696EWE+T enforces a 1.6s watchdog timeout period immediately after power-up or reset assertion, regardless of OSC SEL/OSC IN configuration. This extended window allows the microprocessor time to initialize peripherals and configure I/O before beginning WDI toggling. Only after the first WDI transition post-RESET does the selected timeout (100ms or 1.6s) become active - preventing false resets during boot.
Is the PFI input of the MAX696EWE+T compatible with direct connection to a 3.3V supply rail?
No - connecting PFI directly to 3.3V violates the PFI input voltage limit of 1.4V max (typ 1.3V). Doing so will force PFO low continuously and may damage the comparator input. To monitor a 3.3V rail, use a resistor divider (e.g., 1.5MΩ + 1MΩ) to scale PFI voltage to ≤1.3V. The MAX696EWE+T's PFI is designed for sensing unregulated supplies or battery voltages via external scaling, not direct rail connection.
MAX696EWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX696EWE+T FAQ
1.How can I place an order for MAX696EWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX696EWE+T 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 MAX696EWE+T reliable?
The price and inventory of MAX696EWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX696EWE+T is usually 5 days.
3.What payment methods are accepted for MAX696EWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX696EWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX696EWE+T?
MAX696EWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX696EWE+T 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 MAX696EWE+T?
For technical support, including MAX696EWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX696EWE+T requirements.
6.How does Aetrix verify that MAX696EWE+T is sourced from the original manufacturer or authorized distributors?
All MAX696EWE+T 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 MAX696EWE+T meets industry standards.
7.What is the process for return or replacement of MAX696EWE+T?
All MAX696EWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX696EWE+T, 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 MAX696EWE+T part is unused and in its original packaging.
Return procedure for MAX696EWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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