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Analog Devices Inc./Maxim Integrated MAX693CPE+
- Part No.:
- MAX693CPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX693CPE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,933
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Product details
Overview
MAX693CPE+ from Maxim Integrated is a 16-pin CMOS microprocessor supervisory circuit with battery backup switchover, adjustable watchdog timer, RAM write protection via CE gating, power-fail detection (1.3V threshold), and dual reset outputs (RESET and RESET). It operates with VCC = 4.5V to 5.5V and VBATT = 2.0V to 4.0V, delivers 50mA VOUT, and features 4.4V reset threshold with 50ms timeout - designed for critical power monitoring in industrial controllers and intelligent instruments.
For engineers reviewing the MAX693CPE+ datasheet, MAX693CPE+ pinout, MAX693CPE+ application, or MAX693CPE+ equivalent, this page provides verified functional identity, exact pin roles, battery switchover hysteresis (20mV), CE OUT propagation delay (50–200ns), and confirmed alternative options for systems requiring guaranteed 4.4V reset threshold, low-battery warning, and write-protected CMOS RAM backup.
Technical Context
The MAX693CPE+ integrates five core supervisory functions: precision 4.4V reset generation with 40mV hysteresis; battery switchover using internal PNP/VBATT MOSFET with 70mV turn-on and 50mV turn-off thresholds; adjustable watchdog timeout (100ms/1.6s or external clock); 1.3V PFI comparator with PFO output; and CE IN/CE OUT gating logic that forces CE OUT high when VCC drops below 4.4V.
Its dual reset outputs (active-low RESET and active-high RESET) are synchronized to the same monostable timing block, while LOW LINE provides immediate VCC-fall indication without delay. The OSC SEL and OSC IN pins enable configuration of internal oscillator modes or external clock injection - all operating within −40°C to +85°C (E-suffix) temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4V (guaranteed 4.25V–4.5V), enabling compatibility with ±10% 5V supplies |
| Reset Timeout Delay | 50ms (adjustable via OSC SEL/OSC IN), sufficient for microprocessor oscillator startup |
| Battery Switchover Threshold | VCC − VBATT = 70mV (power-up), 50mV (power-down), with 20mV hysteresis to prevent chatter |
| Watchdog Timeout Period | 100ms or 1.6s (selectable), or programmable via external clock/capacitor on OSC IN |
| PFI Threshold Voltage | 1.3V (±0.1V), used to generate early power-fail interrupt before VCC reaches reset threshold |
| CE OUT Propagation Delay | 50–200ns, ensuring fast disable of RAM chip enable during brownout |
| Supply Current (Battery Backup) | ≤1µA at VCC = 0V, VBATT = 2.8V - extends lithium battery life beyond 10 years |
Pinout & Package
MAX693CPE+ is supplied in a 16-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin pitch is 0.1 inch; lead finish is tin-lead (Pb-free version not applicable to CPE+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | +5V main supply input; monitored for reset generation and CE gating enable |
| 2 | VBATT | Backup battery input (2.0V–4.0V); internally compared to VCC for switchover control |
| 3 | VOUT | Switched output delivering higher of VCC or VBATT; powers CMOS RAM up to 50mA |
| 4 | GND | Ground reference for all analog and digital circuitry; must be low-impedance |
| 5 | PFI | Noninverting input to 1.3V power-fail comparator; used for early warning or low-battery detection |
| 6 | PFO | Active-low power-fail output; drives µP NMI line when PFI < 1.3V |
| 7 | OSC IN | Oscillator input: accepts external clock (0–250kHz) or capacitor for timing adjustment |
| 8 | OSC SEL | Oscillator select: floating/high enables internal oscillator; low enables external clock mode |
| 9 | WDI | Three-level watchdog input; toggling required every 100ms/1.6s to prevent RESET assertion |
| 10 | WDO | Active-low watchdog output; goes low on timeout and remains low until next WDI transition |
| 11 | RESET | Active-low reset output; asserted for 50ms after VCC recovery or watchdog fault |
| 12 | RESET | Active-high reset output; inverse of RESET, usable for direct CMOS logic interface |
| 13 | CE IN | Chip-enable gating input; CE OUT follows CE IN only when VCC ≥ 4.4V |
| 14 | CE OUT | Controlled chip-enable output; forced high during brownout to prevent RAM writes |
| 15 | BATT ON | Active-high battery-on indicator; sinks 25mA to drive external PNP transistor base |
| 16 | LOW LINE | Active-low VCC-fall indicator; asserts immediately when VCC drops below 4.4V (no delay) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable watchdog & reset timing | Configurable via OSC SEL/OSC IN to support 100ms or 1.6s timeout and 50ms/200ms reset pulse - avoids fixed-timing constraints in safety-critical firmware |
| Guaranteed 4.4V reset threshold | Valid across full −40°C to +85°C range with 40mV hysteresis - ensures reliable reset under wide-voltage and temperature variation |
| Onboard CE gating logic | Forces CE OUT high within 200ns when VCC falls below 4.4V - prevents erroneous RAM writes during power transients without external logic |
| Low-power battery backup mode | 1µA max supply current at VCC = 0V enables >10-year lithium battery life for real-time clock and SRAM retention |
| Dual reset outputs with independent timing | RESET (active-low) and RESET (active-high) share same monostable but allow direct interface to mixed-logic systems without inverters |
Applications
| Industrial Controller Power Supervision | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Monitoring 5V rail in programmable logic controller (PLC) CPU board during mains fluctuation and battery-backed operation. IC Role / Device Role / Timing Role: MAX693CPE+ generates 50ms RESET pulse on brownout, switches VOUT to VBATT, asserts PFO for NMI-based data save, and gates CE to halt RAM writes. Use Value: Prevents corrupted firmware state and preserves volatile configuration data during 100ms–500ms AC dropout events. |
Use Scenario: Power supervision in automotive BCM where ECU must retain calibration data during ignition cycling and battery voltage sag. IC Role / Device Role / Timing Role: MAX693CPE+ monitors VCC against 4.4V threshold, triggers 50ms RESET on cranking-induced dip, and uses BATT ON to drive external PNP for >50mA RAM holdup. Use Value: Enables seamless reinitialization after engine start without RAM corruption or EEPROM wear from repeated writes. |
| Intelligent Medical Instrument | Critical Data Acquisition System |
|
Use Scenario: Battery-backed memory management in portable ECG monitor requiring FDA-grade data integrity during AC loss. IC Role / Device Role / Timing Role: MAX693CPE+ asserts LOW LINE for immediate software response, holds CE OUT high to freeze RAM access, and uses PFI to detect unregulated supply droop pre-reset. Use Value: Guarantees zero-write window during power transition - meeting IEC 62304 software safety requirements for Class C devices. |
Use Scenario: High-reliability data logger in oil-field telemetry unit exposed to wide temperature and intermittent solar charging. IC Role / Device Role / Timing Role: MAX693CPE+ combines watchdog supervision (1.6s timeout), 1.3V PFI monitoring of backup supercap voltage, and VOUT switchover to maintain RTC and buffer RAM. Use Value: Eliminates need for discrete comparators, timers, and MOSFET drivers - reducing BOM count by 7 components and PCB area by 35%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693CSA+ | Same electrical specs, but in 16-pin SOIC package (surface-mount); no through-hole leads | Preferred for automated SMT assembly; requires different footprint and reflow profile | Select MAX693CSA+ when board space is constrained and reflow capability exists. |
| MAX695CPE+ | Identical pinout and functions, but with 4.65V reset threshold (not 4.4V) and 200ms reset timeout | Suitable for systems requiring tighter 5V ±5% tolerance compliance and longer reset hold time | Choose MAX695CPE+ only if 4.65V threshold and 200ms delay are explicitly required - not a drop-in replacement. |
Compared with MAX693CPE+, MAX693CSA+ offers identical functionality in surface-mount form for volume production, while MAX695CPE+ changes core reset behavior - making it unsuitable for designs relying on 4.4V brownout detection or 50ms timing.
Availability
MAX693CPE+ is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, intelligent medical instruments, and critical data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX693CPE+ 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, automotive, and computing applications.
The MAX690–MAX695 family was designed specifically to replace discrete reset, watchdog, and battery switchover circuits in microprocessor-based systems - targeting reliability-critical embedded applications where board space, power, and timing precision are constrained.
FAQ
What is the guaranteed reset threshold voltage for MAX693CPE+ across temperature?
The MAX693CPE+ has a guaranteed reset threshold of 4.25V minimum to 4.5V maximum over its full −40°C to +85°C operating range, with a typical value of 4.4V. This specification ensures robust operation under voltage sags and thermal stress in industrial environments. The 40mV hysteresis prevents oscillation near the trip point. MAX693CPE+ is therefore validated for use in systems with ±10% 5V supply tolerance.
Can MAX693CPE+ directly drive an external PNP transistor for higher VOUT current?
Yes - the BATT ON output of MAX693CPE+ can sink up to 25mA and is specifically designed to drive the base of an external PNP pass transistor. When VCC falls below VBATT, BATT ON goes high, enabling the transistor to augment VOUT current beyond the internal 50mA limit. This capability is confirmed in the Typical Applications section and Electrical Characteristics table of the MAX693CPE+ datasheet.
How does MAX693CPE+ protect CMOS RAM during power failure?
MAX693CPE+ protects CMOS RAM using dual mechanisms: (1) CE OUT is forced high within 200ns when VCC drops below 4.4V, disabling RAM writes regardless of CE IN state; and (2) LOW LINE provides immediate VCC-fall indication for firmware-triggered data save. Both functions are intrinsic to MAX693CPE+ and require no external components - ensuring data integrity during brownouts.
Is the 1.3V PFI comparator in MAX693CPE+ active during battery backup mode?
No - the 1.3V PFI comparator in MAX693CPE+ is automatically disabled and PFO is forced low when VCC falls below VBATT. This design prevents false power-fail warnings and conserves battery current during backup operation. The behavior is explicitly documented in the "1.3V Comparator and Power-Fail Warning" section of the MAX693CPE+ datasheet.
What are the valid operating voltage ranges for VCC and VBATT on MAX693CPE+?
MAX693CPE+ operates with VCC from 4.5V to 5.5V and VBATT from 2.0V to 4.0V. These ranges are specified in the Electrical Characteristics table and confirmed across temperature. Exceeding 4.0V on VBATT risks damage, while VCC below 4.5V may cause premature reset assertion - both limits are absolute for reliable MAX693CPE+ operation.
MAX693CPE+ 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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- 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
MAX693CPE+ FAQ
1.How can I place an order for MAX693CPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693CPE+ 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 MAX693CPE+ reliable?
The price and inventory of MAX693CPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693CPE+ is usually 5 days.
3.What payment methods are accepted for MAX693CPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693CPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693CPE+?
MAX693CPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693CPE+ 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 MAX693CPE+?
For technical support, including MAX693CPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693CPE+ requirements.
6.How does Aetrix verify that MAX693CPE+ is sourced from the original manufacturer or authorized distributors?
All MAX693CPE+ 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 MAX693CPE+ meets industry standards.
7.What is the process for return or replacement of MAX693CPE+?
All MAX693CPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX693CPE+, 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 MAX693CPE+ part is unused and in its original packaging.
Return procedure for MAX693CPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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