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Analog Devices Inc./Maxim Integrated MAX696CPE
- Part No.:
- MAX696CPE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX696CPE.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,765
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Product details
Overview
MAX696CPE from Maxim Integrated is a microprocessor supervisory circuit in 16-pin PDIP 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), battery-backup switching (VOUT switchover, 50mA output), RESET/RESET active-low/active-high outputs, and 50ms default reset timeout. It is used in industrial controllers and embedded systems requiring reliable power monitoring and RAM backup during brownout.
For engineers reviewing the MAX696CPE datasheet, MAX696CPE pinout, MAX696CPE application, or MAX696CPE equivalent, key selection considerations include its battery-switching capability (absent in MAX697), 1μA battery-standby current, dual reset outputs, and compatibility with 3.0V–5.5V VCC and 2.0V–4.25V VBATT operation.
Technical Context
The MAX696CPE integrates a precision 1.3V reference for both LLIN and PFI comparators, with independent hysteresis (12mV on LLIN, programmable on PFI). Its internal oscillator (10.24kHz nominal) or external capacitor/clock input drives both reset timeout and watchdog timing, configurable via OSC SEL and OSC IN pins.
Battery switchover uses a pnp transistor for VCC-to-VOUT connection and a 200Ω MOSFET for VBATT-to-VOUT backup, with 50mV/70mV switchover thresholds and 20mV hysteresis. BATT ON provides 7mA sink drive to enable external pnp pass transistors when VBATT supplies VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0V to 5.5V - supports standard +5V μP rails with ±10% tolerance margin. |
| VBATT Range | 2.0V to 4.25V - compatible with lithium coin cells and rechargeable backup sources. |
| Low-Line Threshold | 1.25V–1.35V (typ 1.30V) - precise detection of VCC brownout before μP malfunction. |
| Reset Timeout | 35ms–70ms (typ 50ms) - ensures μP clock stabilization before release from reset. |
| Watchdog Period | 100ms or 1.6s (selectable) - balances fault detection speed vs. software initialization time. |
| Battery Standby Current | ≤1μA max - extends shelf life of backup battery during extended power loss. |
| VOUT Output Current | 50mA (VCC mode), 250μA (battery mode) - powers CMOS RAM without external regulators. |
Pinout & Package
MAX696CPE is housed in a 16-pin plastic DIP (PDIP) package with 0.3-inch width, through-hole mounting, and industry-standard pin spacing (0.1" pitch). Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| 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 | Switched output supply | Delivers higher of VCC or VBATT to CMOS RAM; 50mA capable in VCC mode, 250μA in battery mode. |
| 3 VCC | Main supply input | +5V system rail input; powers internal circuitry and enables VOUT-to-VCC connection. |
| 4 GND | Ground reference | Common 0V return for all analog and digital functions; must be low-impedance. |
| 5 BATT ON | Battery-active indicator | Open-drain output sinks 7mA when VBATT supplies VOUT; drives base of external pnp transistor. |
| 6 LOW LINE | Low-voltage alarm | Active-low signal asserted when LLIN < 1.3V; used for system-level brownout notification. |
| 7 OSC IN | Oscillator timing input | Accepts external capacitor (e.g., 47pF → ~4kHz) or clock signal to set reset/watchdog timing. |
| 8 OSC SEL | Oscillator mode select | High/floating = internal oscillator; low = external timing source; pullup 3μA. |
| 9 PFI | Power-fail input | Noninverting comparator input referenced to 1.3V; monitors unregulated supply or battery voltage. |
| 10 PFO | Power-fail output | Active-low interrupt to μP NMI line; asserts when PFI < 1.3V, disabled if VCC < VBATT. |
| 11 WDI | Watchdog input | Three-level input (low/mid/high); toggling required every 100ms or 1.6s to prevent reset pulse. |
| 12 N.C. | No connection | Unbonded pin; must remain floating; no electrical function. |
| 13 LLIN | Low-line sense input | CMOS input to 1.3V comparator; connects to resistor 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 μP RESET pin low for ≥50ms after brownout or watchdog timeout; 400μA sink capability. |
| 16 RESET | Active-high reset output | Inverted replica of RESET; directly interfaces with logic requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated battery switchover | Automatic VOUT sourcing from VCC or VBATT with 20mV hysteresis and ≤1μA standby draw. |
| Dual reset outputs | Simultaneous active-low (RESET) and active-high (RESET) signals eliminate need for external inverters. |
| Configurable watchdog timing | Selectable 100ms or 1.6s timeout via OSC SEL/OSC IN; longer period applied immediately post-reset. |
| Separate power-fail detection | Dedicated 1.3V PFI comparator with independent threshold enables early warning before brownout. |
| Low-line monitor with hysteresis | 1.3V comparator with 12mV built-in hysteresis prevents chatter during slow VCC decay. |
| Chip-enable gating (MAX697 only) | Not applicable to MAX696CPE - this feature is exclusive to MAX697 variants. |
Applications
| Industrial Controller Power Monitoring | Embedded Data Logger with RAM Backup |
|---|---|
|
Use Scenario: PLC or RTU operating in remote locations with intermittent AC power and backup battery. IC Role / Device Role / Timing Role: Supervises VCC rail, triggers reset on brownout, switches RAM supply to VBATT, and issues NMI before power loss. Use Value: Prevents data corruption during grid fluctuations by ensuring RAM remains powered and μP resets cleanly. |
Use Scenario: Battery-powered environmental sensor node logging temperature/humidity to CMOS SRAM. IC Role / Device Role / Timing Role: Provides 50mA VOUT to RAM during main power, detects low battery via PFI, and holds reset until stable VCC returns. Use Value: Enables >10-year battery life with 1μA backup current and eliminates need for discrete reset + switchover ICs. |
| Medical Diagnostic Equipment | Point-of-Sale Terminal with Secure Memory |
|
Use Scenario: Portable ultrasound device requiring fail-safe boot sequence and nonvolatile memory retention. IC Role / Device Role / Timing Role: Generates 50ms power-on reset, monitors VCC for safe boot window, and asserts PFO to save critical state pre-shutdown. Use Value: Guarantees deterministic startup and preserves patient data integrity during unexpected power interruption. |
Use Scenario: Retail terminal with encrypted EEPROM storing transaction keys and audit logs. IC Role / Device Role / Timing Role: Uses LLIN to disable CE OUT (not available on MAX696CPE) - not applicable; MAX696CPE instead secures RAM via VOUT switchover and RESET hold. Use Value: Maintains RAM power during brief outages, preventing loss of pending transactions and enabling graceful shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX697CPE | Lacks VBATT/VOUT/BATT ON pins; adds CE IN/CE OUT for RAM write protection; consumes <250μA (vs. 1.5–4mA in VCC mode for MAX696CPE). | Used where battery backup is unnecessary but CMOS RAM write-protection is required; unsuitable for systems needing seamless VCC-to-battery switchover. | Select MAX697CPE only if write-gating is prioritized over backup power switching. |
| TPS3823-50DBVR | Single-supply (VCC only), no battery switching, fixed 5.0V reset threshold, 200ms reset timeout, no watchdog or PFI. | Suitable for basic reset-only applications; cannot replace MAX696CPE in systems requiring battery switchover, watchdog, or power-fail warning. | Choose TPS3823-50DBVR only for cost-sensitive, single-rail designs without advanced supervision features. |
Compared with MAX697CPE and TPS3823-50DBVR, the MAX696CPE uniquely combines battery-backed power switching, dual reset outputs, and configurable watchdog timing in one PDIP package-making it irreplaceable in legacy industrial controllers requiring RAM retention during AC loss.
Availability
MAX696CPE 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 product lifecycles.
Supply support for MAX696CPE 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 industrial, automotive, and communications applications, with emphasis on reliability and integration.
The MAX696CPE belongs to Maxim's microprocessor supervisory product line, engineered specifically for embedded systems needing coordinated reset, watchdog, battery switchover, and power-fail warning in a single IC.
FAQ
What is the maximum backup battery voltage supported by the MAX696CPE?
The MAX696CPE supports VBATT from 2.0V to 4.25V. Operation above 4.25V risks exceeding absolute maximum ratings and may damage the internal switchover MOSFET. For lithium coin cells (e.g., CR2032, 3.0V nominal) or supercapacitors, ensure VBATT stays within this range. The MAX696CPE also specifies a minimum 70mV differential between VCC and VBATT to avoid unstable switchover behavior.
Does the MAX696CPE provide both active-low and active-high reset outputs?
Yes, the MAX696CPE provides two dedicated reset outputs: pin 15 (RESET) is active-low, and pin 16 (RESET) is active-high. Both are internally generated and synchronized - RESET is the logical inverse of RESET. This eliminates the need for external inverters in systems requiring either polarity, and both outputs drive CMOS inputs directly without pull-up resistors due to built-in 3μA pullup on RESET.
How does the MAX696CPE handle watchdog timeout immediately after power-on reset?
The MAX696CPE applies an extended watchdog timeout (1.6s) immediately after power-on or brownout reset, regardless of OSC SEL/OSC IN configuration. This gives the microprocessor sufficient time to initialize clocks and peripherals before the first watchdog strobe is expected. Once the first WDI transition occurs while RESET is high, the watchdog reverts to the selected timeout (100ms or 1.6s). This behavior is hardwired and cannot be disabled.
Can the MAX696CPE's power-fail detector (PFI/PFO) monitor the backup battery itself?
Yes, the PFI input can monitor VBATT directly for low-battery warning. Connect VBATT to PFI through a resistor divider that scales VBATT down to ≤1.3V when battery voltage falls below the desired threshold (e.g., 2.5V). Note that the PFI comparator is automatically disabled and PFO forced low when VCC < VBATT - so this monitoring only operates during normal VCC-powered operation, not during battery backup mode.
What is the purpose of the BATT ON pin on the MAX696CPE?
The BATT ON pin (pin 5) is an open-drain output that goes high-impedance when VCC supplies VOUT, and sinks up to 7mA when VBATT supplies VOUT. Its primary design purpose is to drive the base of an external pnp transistor, enabling higher VOUT current (>50mA) during battery backup. It provides direct hardware feedback on switchover status and simplifies external pass-transistor control without additional logic.
MAX696CPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX696CPE FAQ
1.How can I place an order for MAX696CPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX696CPE 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 MAX696CPE reliable?
The price and inventory of MAX696CPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX696CPE is usually 5 days.
3.What payment methods are accepted for MAX696CPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX696CPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX696CPE?
MAX696CPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX696CPE 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 MAX696CPE?
For technical support, including MAX696CPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX696CPE requirements.
6.How does Aetrix verify that MAX696CPE is sourced from the original manufacturer or authorized distributors?
All MAX696CPE 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 MAX696CPE meets industry standards.
7.What is the process for return or replacement of MAX696CPE?
All MAX696CPE units undergo pre-shipment inspection (PSI). If there is an issue with MAX696CPE, 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 MAX696CPE part is unused and in its original packaging.
Return procedure for MAX696CPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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