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Analog Devices Inc./Maxim Integrated MAX697CPE+
- Part No.:
- MAX697CPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX697CPE+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,277
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Product details
Overview
MAX697CPE+ from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, watchdog timer, power-fail detection, and CMOS RAM write protection in a single 16-pin PDIP package. It features a 1.3V precision low-line threshold, 50ms default reset timeout, 100ms/1.6s selectable watchdog period, and CE IN/CE OUT gating logic. It operates from 3.0V to 5.5V VCC and draws only 160–300µA supply current, targeting critical μP power monitoring in embedded controllers and intelligent instruments.
For engineers reviewing the MAX697CPE+ datasheet, MAX697CPE+ pinout, MAX697CPE+ application, or MAX697CPE+ equivalent, key selection considerations include its lack of battery-backup switching (vs. MAX696), dedicated chip-enable gating for RAM/EPROM, ultra-low quiescent current, and dual-mode watchdog timing via OSC SEL/OSC IN.
Technical Context
The MAX697CPE+ integrates six core supervisory functions: (1) adjustable low-line reset triggered when LLIN falls below 1.3V (±50mV tolerance), (2) watchdog timeout with internal oscillator (100ms or 1.6s) or external clock/capacitor configuration, (3) separate LOW LINE and WDO fault outputs, (4) programmable reset timeout using external capacitor or OSC IN frequency, and (5) independent 1.3V PFI comparator for power-fail or low-battery warning. Its CE IN/CE OUT pair implements active-high write-protection gating synchronized to LLIN status.
Unlike the MAX696, the MAX697CPE+ omits VBATT, VOUT, and BATT ON pins-enabling lower supply current (<300µA) and freeing pins for CE control. The internal 1.3V reference drives both LLIN and PFI comparators, with PFO forced low and comparator disabled when VCC < VBATT (though VBATT is unused and grounded in MAX697).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0V to 5.5V - supports standard +5V μP systems with margin for brownout tolerance. |
| Supply Current | 160µA (typ), 300µA (max) - enables long-life battery operation in portable or backup-critical systems. |
| Low-Line Threshold | 1.25V to 1.35V - precise 1.3V nominal comparator reference ensures reliable reset assertion during VCC sag. |
| Reset Timeout | 35ms to 70ms (default 50ms) - holds RESET low long enough for μP oscillator startup and initialization. |
| Watchdog Period | 100ms (short) or 1.6s (long), selectable via OSC SEL/OSC IN - balances fault detection speed vs. software recovery time. |
| PFI Threshold | 1.2V to 1.4V - allows early power-fail warning before LLIN trips, enabling graceful data save prior to reset. |
| CE Propagation Delay | 80ns to 150ns - ensures fast, deterministic write-protection activation when VCC drops below valid level. |
Pinout & Package
MAX697CPE+ is housed in a 16-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VBATT | Not connected (NC) in MAX697 - must be grounded per datasheet; unused due to absence of battery switchover. |
| 2 | VOUT | NC in MAX697 - tied to GND; no internal switching function; differs from MAX696's VOUT output. |
| 3 | VCC | Main +5V supply input - powers all internal circuits; absolute max rating is +6V. |
| 4 | GND | System ground reference - common return path for all analog and digital sections. |
| 5 | N.C. | No connection - pin 5 is unassigned and must remain open (not bonded internally). |
| 6 | LOW LINE | Active-low comparator output - asserts low when LLIN < 1.3V; used for system-level brownout signaling. |
| 7 | OSC IN | Oscillator timing input - sets reset/watchdog timing via external capacitor or clock signal when OSC SEL = low. |
| 8 | OSC SEL | Oscillator mode select - high/floating enables internal oscillator; low enables external timing source. |
| 9 | PFI | Power-fail input - noninverting input to 1.3V comparator; monitors external voltage divider for early warning. |
| 10 | PFO | Power-fail output - active-low open-drain output; asserts low when PFI < 1.3V or VCC < VBATT. |
| 11 | WDI | Three-level watchdog input - toggling required every 100ms/1.6s; floating disables watchdog. |
| 12 | CE OUT | Chip-enable output - buffered, gated replica of CE IN; forced high when LLIN < 1.3V to block writes. |
| 13 | CE IN | Chip-enable input - accepts CMOS-level CE/CS/WR signal; internally pulled up (3µA) when unused. |
| 14 | WDO | Watchdog output - active-low; goes low on timeout and remains low until next WDI transition. |
| 15 | RESET | Active-low reset output - pulses low for 50ms on low-line or watchdog fault; includes internal 3µA pullup. |
| 16 | RESET | Active-high reset output - inverted complement of RESET; drives CMOS inputs directly without pullup. |
Key Features
| Feature | Design Value |
|---|---|
| On-board CE gating logic | Prevents RAM/EPROM writes during invalid VCC via CE IN → CE OUT path with <150ns delay and LLIN-synchronized forcing. |
| Dual-mode watchdog timer | Selects between 100ms (fast fault response) or 1.6s (software recovery margin) using OSC SEL/OSC IN configuration. |
| Independent power-fail detector | 1.3V PFI comparator provides early warning before reset triggers, enabling NMI-driven data save routines. |
| Adjustable reset timeout | 50ms default extended via external capacitor on OSC IN - supports custom timing for slow-starting peripherals. |
| Ultra-low quiescent current | 160µA typical supply current - reduces standby power in always-on or battery-backed instrumentation. |
Applications
| Industrial Controller Monitoring | Medical Instrument Power Supervision |
|---|---|
|
Use Scenario: PLC or motion controller requiring guaranteed reset on AC line sags and watchdog recovery from firmware lockups. IC Role / Device Role / Timing Role: Central supervisory IC generating RESET, WDO, and PFO signals; coordinates brownout response and memory write protection. Use Value: Prevents corrupted I/O state during undervoltage events and ensures deterministic restart after software hangs without external discrete components. |
Use Scenario: Portable diagnostic device with EEPROM-stored calibration data and battery-backed real-time clock. IC Role / Device Role / Timing Role: Provides CE OUT-driven write protection during VCC drop and PFO-triggered data save before power loss. Use Value: Guarantees data integrity in life-critical storage by disabling writes at precisely 1.3V VCC threshold, independent of regulator dropout. |
| Communications Equipment Reset Management | Test & Measurement System Watchdog |
|
Use Scenario: Network switch with multiple ASICs needing synchronized reset and early power-fail alert to initiate graceful shutdown. IC Role / Device Role / Timing Role: Generates system-wide RESET pulse and feeds PFO to host processor NMI line for controlled power-down sequence. Use Value: Eliminates need for discrete voltage monitors and timers, reducing BOM count while ensuring sub-100ms fault response. |
Use Scenario: Automated test equipment performing long-duration calibration routines vulnerable to silent software faults. IC Role / Device Role / Timing Role: Monitors WDI strobing; asserts RESET and WDO on missed toggle to force hardware reset and log fault event. Use Value: Detects hung test sequences without CPU intervention, improving test repeatability and reducing false-pass risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX696CPE+ | Includes VBATT/VOUT/BATT ON for battery-backup switching; higher supply current (2–7mA in VCC mode); lacks CE IN/CE OUT. | Suitable where CMOS RAM backup is required; unsuitable where write-protection gating is needed. | Select MAX696CPE+ only if battery switchover is mandatory and CE gating is unnecessary. |
| TPS3808G33DBVR | Single fixed 3.3V reset threshold; no watchdog, PFI, or CE gating; 1.6µA quiescent current; SOT-23-6 package. | Applicable only for basic reset-only use cases; cannot replace MAX697CPE+ in watchdog or memory protection roles. | Choose TPS3808G33DBVR only for cost-sensitive, space-constrained designs needing only 3.3V reset with ultra-low IQ. |
Compared with MAX696CPE+, MAX697CPE+ trades battery switchover for CE gating and lower IQ, making it optimal for write-protected memory systems. Compared with TPS3808G33DBVR, it delivers full supervisory functionality-including watchdog, PFI, and dual reset outputs-at higher current but essential for complex μP supervision.
Availability
MAX697CPE+ is available at Aetrix Electronics and suitable for industrial controllers, medical instrumentation, communications equipment, and test & measurement systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX697CPE+ 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, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX697CPE+ belongs to Maxim's microprocessor supervisory product line, engineered specifically to consolidate reset, watchdog, power-fail detection, and memory write protection into one compact IC for reliability-critical embedded systems.
FAQ
What is the primary function of the MAX697CPE+?
The MAX697CPE+ is a multifunction microprocessor supervisory circuit that provides power-on/brownout reset generation, watchdog timer supervision, power-fail warning via PFI/PFO, and chip-enable gating for CMOS RAM or EPROM write protection. Unlike the MAX696, it excludes battery-backup switching to enable lower supply current and dedicate pins to CE control - making MAX697CPE+ ideal for systems prioritizing memory integrity over backup power management.
How does the CE IN and CE OUT functionality work in the MAX697CPE+?
In the MAX697CPE+, CE IN accepts an external chip-enable or write signal, and CE OUT delivers a buffered, gated version. When LLIN remains above 1.3V, CE OUT replicates CE IN with ≤150ns propagation delay. If LLIN drops below 1.3V, CE OUT is forced high regardless of CE IN state - preventing memory writes during invalid VCC. This behavior is confirmed in the MAX697CPE+ datasheet Figure 4 and Electrical Characteristics table under "CHIP-ENABLE GATING".
Can the MAX697CPE+ be used in place of the MAX696CPE+?
No - the MAX697CPE+ is not a drop-in replacement for MAX696CPE+. It lacks VBATT, VOUT, and BATT ON pins and instead provides CE IN/CE OUT functionality. Substituting MAX697CPE+ for MAX696CPE+ would leave battery-backup circuitry unconnected and disable RAM backup capability, while adding unused CE pins. The two share pinout compatibility only in the common 16-pin PDIP footprint, but their internal functions and terminal assignments differ significantly per the MAX697CPE+ datasheet Pin Description table.
What are the watchdog timeout options for the MAX697CPE+?
The MAX697CPE+ offers two primary watchdog timeout periods: 100ms (short) and 1.6s (long), selected via the OSC SEL and OSC IN pins. With OSC SEL high/floating and OSC IN low, the short period activates; with OSC SEL high/floating and OSC IN floating, the long period applies. After any reset, the timeout defaults to 1.6s to allow μP initialization. External timing via capacitor or clock on OSC IN (with OSC SEL low) enables further customization - all modes are documented in Table 1 of the MAX697CPE+ datasheet.
What is the operating temperature range for the MAX697CPE+?
The MAX697CPE+ is rated for 0°C to +70°C ambient operation, indicated by the "C" suffix in the part number. This commercial-grade temperature range is validated across all electrical specifications including reset threshold (1.25V–1.35V), supply current (160–300µA), and timing parameters. The "+" suffix denotes lead-free packaging compliant with RoHS directives, as specified in the Ordering Information section of the MAX697CPE+ datasheet.
MAX697CPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX697CPE+ FAQ
1.How can I place an order for MAX697CPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX697CPE+ 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 MAX697CPE+ reliable?
The price and inventory of MAX697CPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX697CPE+ is usually 5 days.
3.What payment methods are accepted for MAX697CPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX697CPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX697CPE+?
MAX697CPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX697CPE+ 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 MAX697CPE+?
For technical support, including MAX697CPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX697CPE+ requirements.
6.How does Aetrix verify that MAX697CPE+ is sourced from the original manufacturer or authorized distributors?
All MAX697CPE+ 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 MAX697CPE+ meets industry standards.
7.What is the process for return or replacement of MAX697CPE+?
All MAX697CPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX697CPE+, 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 MAX697CPE+ part is unused and in its original packaging.
Return procedure for MAX697CPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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