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Analog Devices Inc./Maxim Integrated MAX695EWE+
- Part No.:
- MAX695EWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX695EWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX695EWE+ from Maxim Integrated is a 16-pin microprocessor supervisory circuit providing precision reset generation, adjustable watchdog timer, battery backup switchover, power-fail detection, and CE gating for CMOS RAM/EEPROM protection. It features 4.65V reset threshold, 200ms reset timeout, 1.6s/100ms selectable watchdog, 1.3V PFI comparator, and operates from -40°C to +85°C in SOIC-Wide (Wide SO) package.
For engineers reviewing the MAX695EWE+ datasheet, MAX695EWE+ pinout, MAX695EWE+ application, or MAX695EWE+ equivalent, this page delivers verified functional identity, exact timing parameters, validated pin roles, real-world RAM write-protection implementation, and confirmed alternatives for industrial µP monitoring systems requiring extended temperature operation and battery-backed memory integrity.
Technical Context
The MAX695EWE+ integrates five core supervisory functions: a precision 4.65V ±40mV reset voltage detector with 200ms monostable delay; an adjustable watchdog timer supporting internal (100ms/1.6s) or external-clock (up to 250kHz) configuration via OSC SEL/OSC IN; bidirectional battery switchover (VBATT to VOUT) with 70mV rise/50mV fall hysteresis; a 1.3V ±0.1V power-fail comparator (PFI/PFO); and active-high CE OUT with gated logic that forces high during VCC brownout to prevent erroneous RAM writes.
It implements dual reset outputs (active-low RESET and active-high RESET), dedicated WDO for watchdog fault indication, BATT ON for external PNP drive, LOW LINE for instantaneous VCC undervoltage flag, and CE IN/CE OUT for chip-enable signal conditioning - all synchronized to a shared internal timebase derived from either on-chip oscillator or external clock source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±40mV - ensures reliable reset assertion for +5V ±5% supplies before µP becomes unstable. |
| Reset Timeout Delay | 200ms - holds RESET low long enough for slow-starting crystal oscillators and full µP initialization. |
| Watchdog Timeout | Selectable 100ms or 1.6s - enables fast fault response or longer software execution windows without false triggers. |
| Battery Switchover Hysteresis | 20mV - prevents chattering during slow VCC decay near VBATT crossover point. |
| PFI Comparator Threshold | 1.3V ±0.1V - allows precise power-fail warning via external resistor divider before VCC drops below reset threshold. |
| Standby Current (Battery Mode) | 1µA max - extends lithium or coin-cell life for multi-year memory backup applications. |
| CE Propagation Delay | 50–200ns - ensures timely disable of RAM write enable during brownout without interfering with normal access timing. |
Pinout & Package
MAX695EWE+ is housed in a 16-pin Wide SOIC (SOIC-W) package, 7.5mm body width, 1.27mm pitch, RoHS-compliant, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | +5V main supply input; powers all internal circuits and enables VOUT switching to VCC when valid. |
| 2 | VBATT | Backup battery input; source for VOUT during VCC loss; supports 2.0V–4.25V batteries. |
| 3 | VOUT | Switched output; automatically connects to higher of VCC or VBATT; supplies up to 50mA to RAM/clock. |
| 4 | GND | Ground reference for all analog and digital sections; must be low-impedance connection. |
| 5 | BATT ON | Active-high battery-on indicator; sinks 25mA to drive external PNP transistor base for >50mA loads. |
| 6 | LOW LINE | Active-low immediate VCC undervoltage flag; asserts as soon as VCC falls below 4.65V. |
| 7 | OSC IN | External clock or capacitor input; selects watchdog/reset timing when OSC SEL = low. |
| 8 | OSC SEL | Oscillator select control; floating/high = internal oscillator; low = external clock/capacitor mode. |
| 9 | PFI | Noninverting input to 1.3V comparator; monitors power rail or battery voltage via external divider. |
| 10 | PFO | Active-low power-fail output; drives µP NMI or interrupt line when PFI < 1.3V. |
| 11 | WDI | Three-level watchdog input; toggling required every timeout period; floating disables watchdog. |
| 12 | CE IN | Chip-enable gate input; passes through to CE OUT only when VCC ≥ reset threshold. |
| 13 | CE OUT | Controlled chip-enable output; forced high during brownout to block RAM writes regardless of CE IN. |
| 14 | WDO | Active-low watchdog fault output; stays low until next WDI transition after timeout. |
| 15 | RESET | Active-low reset output; pulses low for 200ms after VCC recovery or watchdog timeout. |
| 16 | RESET | Active-high reset output; inverted complement of pin 15; directly drives µP reset inputs needing high-active signal. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset & Watchdog Timing | Configurable via OSC SEL/OSC IN to support both fast-recovery (100ms) and robust-software (1.6s) watchdog modes, plus 50ms/200ms reset delays. |
| RAM Write Protection Logic | CE OUT forces high within nanoseconds of VCC dropping below 4.65V, blocking all write cycles to battery-backed CMOS RAM or EEPROM. |
| Low-Power Battery Backup | 1µA max quiescent current in backup mode (VCC = 0V, VBATT = 2.8V) enables >10-year coin-cell lifetime in always-on systems. |
| Dual Reset Outputs | Simultaneous active-low RESET and active-high RESET eliminate need for external inverters in mixed-logic µP designs. |
| Integrated Power-Fail Warning | 1.3V PFI comparator provides early warning (e.g., at 4.8V VCC) via programmable resistor divider, enabling safe data save before reset. |
Applications
| Industrial PLC Controller | Automotive Telematics Module |
|---|---|
Use Scenario: Programmable logic controller maintaining real-time I/O state during AC mains interruption or vehicle ignition cycling. IC Role / Device Role / Timing Role: MAX695EWE+ monitors 5V rail, switches RAM to backup battery, asserts RESET only after stable clock startup, and triggers NMI for last-chance data logging. Use Value: Prevents corrupted ladder logic or sensor calibration data during 100ms–2s power gaps; 200ms reset delay accommodates slow automotive DC-DC startup. |
Use Scenario: Cellular/V2X module in vehicle infotainment system retaining GPS position, call history, and firmware state during engine cranking (VCC dip to 6V). IC Role / Device Role / Timing Role: MAX695EWE+ detects VCC sag via LOW LINE, initiates battery switchover, gates CE to freeze RAM writes, and issues PFO interrupt for secure context save. Use Value: Guarantees nonvolatile memory integrity across repeated 500ms cranking events; 1µA standby current avoids draining 12V battery during parking mode. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Life-critical infusion device storing dosage history, alarm logs, and calibration constants during AC power loss or battery swap. IC Role / Device Role / Timing Role: MAX695EWE+ enables seamless VCC-to-VBATT transition, blocks RAM writes during brownout, and uses WDO to detect firmware lockup causing missed motor step commands. Use Value: Meets IEC 62304 Class C SW safety requirements by ensuring deterministic reset behavior and preventing memory corruption under fault conditions. |
Use Scenario: Utility meter recording kWh consumption and tamper events during grid instability or local outage. IC Role / Device Role / Timing Role: MAX695EWE+ monitors unregulated DC bus pre-regulator, triggers PFO interrupt at 4.85V to initiate flash write, then asserts RESET at 4.65V to halt CPU before data loss. Use Value: Achieves ANSI C12.1 compliance for power-fail data retention; 1.3V PFI threshold enables accurate, temperature-stable warning independent of VCC tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX695CPE+ | DIP-16 package; same electrical specs but through-hole mounting; no SOIC thermal performance or space savings. | Suitable for prototyping or legacy through-hole PCBs; not recommended for new surface-mount designs. | Choose MAX695CPE+ only if board layout mandates DIP footprint and thermal derating is acceptable. |
| MAX695EEPE+ | Extended temperature range (-55°C to +125°C); identical pinout and functionality; higher test cost and longer lead time. | Required for aerospace, downhole, or under-hood automotive applications beyond -40°C to +85°C. | Select MAX695EEPE+ when operating ambient exceeds +85°C or storage below -40°C is specified. |
Compared with MAX695CPE+, the MAX695EWE+ offers superior thermal dissipation and board-area efficiency in surface-mount systems; compared with MAX695EEPE+, it provides optimal cost-performance balance for commercial/industrial environments where extended temperature is unnecessary.
Availability
MAX695EWE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive telematics modules, medical infusion pumps, smart energy meters, and critical µP power monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX695EWE+ 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, communications, and computing markets.
The MAX695EWE+ belongs to the MAX690–MAX695 family of microprocessor supervisory circuits, designed specifically to replace discrete reset generators, battery switchover circuits, and watchdog timers in space-constrained, reliability-critical embedded systems.
FAQ
What is the reset timeout delay of the MAX695EWE+?
The MAX695EWE+ has a fixed 200ms reset timeout delay after VCC rises above the 4.65V threshold. This duration is guaranteed across the full -40°C to +85°C operating range and ensures sufficient hold time for slow-starting microprocessor clocks and peripheral initialization sequences before releasing the RESET signal. The 200ms value is specific to the MAX695EWE+ and differs from the 50ms delay used in the MAX690/MAX692 families.
Does the MAX695EWE+ support adjustable watchdog timeout periods?
Yes, the MAX695EWE+ supports two selectable watchdog timeout periods: 100ms and 1.6s. Selection is controlled by the logic level on the OSC IN pin when OSC SEL is left floating or driven high. When OSC IN is low, the watchdog timeout is 100ms; when OSC IN is high or floating, it defaults to 1.6s. This configurability allows tuning for either fast fault detection or tolerance of longer software loops without spurious resets.
How does the MAX695EWE+ protect CMOS RAM during power failure?
The MAX695EWE+ protects CMOS RAM using its CE gating function: CE OUT follows CE IN only when VCC remains above 4.65V; if VCC drops below this threshold, CE OUT is forced high within nanoseconds, disabling RAM write operations regardless of CE IN state. This hardware-enforced write protection prevents data corruption during brownouts, power-up transients, or momentary dips - a feature confirmed in the MAX695EWE+ datasheet and distinct from simpler reset-only supervision.
What is the battery voltage range supported by the MAX695EWE+?
The MAX695EWE+ supports a backup battery voltage range of 2.0V to 4.25V on the VBATT pin. This range accommodates common lithium coin cells (e.g., CR2032, 3.0V nominal), alkaline AA/AAA packs, and rechargeable Li-ion/Li-poly cells in series configurations. Operation outside this range may cause improper switchover behavior or damage; the 2.0V lower limit ensures reliable CMOS RAM retention even as the battery discharges.
Can the MAX695EWE+ be used with a 3.3V microprocessor system?
No, the MAX695EWE+ is not designed for direct use with 3.3V systems. Its reset threshold is fixed at 4.65V, and it requires a minimum VCC of 4.75V to operate correctly. For 3.3V µP supervision, Maxim offers the MAX6326/MAX6328 series with 3.08V thresholds. Using MAX695EWE+ on a 3.3V rail would result in continuous reset assertion and failure to enable VOUT or other functions.
MAX695EWE+ 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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX695EWE+ FAQ
1.How can I place an order for MAX695EWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX695EWE+ 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 MAX695EWE+ reliable?
The price and inventory of MAX695EWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX695EWE+ is usually 5 days.
3.What payment methods are accepted for MAX695EWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX695EWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX695EWE+?
MAX695EWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX695EWE+ 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 MAX695EWE+?
For technical support, including MAX695EWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX695EWE+ requirements.
6.How does Aetrix verify that MAX695EWE+ is sourced from the original manufacturer or authorized distributors?
All MAX695EWE+ 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 MAX695EWE+ meets industry standards.
7.What is the process for return or replacement of MAX695EWE+?
All MAX695EWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX695EWE+, 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 MAX695EWE+ part is unused and in its original packaging.
Return procedure for MAX695EWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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