My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX693CWE+
- Part No.:
- MAX693CWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX693CWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:190
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX693CWE+ from Maxim Integrated is a 16-pin microprocessor supervisory circuit designed for battery-backed systems requiring precise reset control, watchdog monitoring, and RAM write protection. It features a 4.4V reset threshold, 50ms/200ms selectable reset timeout, 1.6s/100ms watchdog timeout, 1.3V power-fail detection, and CE gating logic - all operating across –40°C to +85°C for industrial embedded applications.
For engineers reviewing the MAX693CWE+ datasheet, MAX693CWE+ pinout, MAX693CWE+ application, or MAX693CWE+ equivalent, this page delivers verified functional scope, exact timing behavior under VCC brownout and WDI timeout conditions, CE OUT propagation delay (50ns), battery switchover hysteresis (20mV), and real-world design implications of its dual-mode oscillator selection (OSC SEL/OSC IN).
Technical Context
The MAX693CWE+ integrates a precision voltage monitor with 4.4V ±150mV reset threshold and 40mV hysteresis, a dual-mode watchdog timer (internal oscillator or external clock input), and a dedicated CE gating path that forces CE OUT high when VCC drops below 4.4V - independent of CE IN state. Its BATT ON output actively sinks 25mA to drive external PNP transistors during battery switchover.
Unlike 8-pin variants, the MAX693CWE+ implements adjustable reset and watchdog timeouts via OSC SEL and OSC IN pins, supports write protection for CMOS RAM/EEPROM via CE OUT, and includes LOW LINE - a fast-responding active-low signal that tracks VCC crossing the reset threshold without delay - enabling real-time brownout detection for system status logging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4V (min 4.25V, max 4.5V); ensures reliable reset assertion for 5V ±10% supplies during brownout. |
| Reset Timeout Delay | 50ms (typical) or 200ms (selectable); holds µP in reset long enough for crystal oscillator startup and firmware initialization. |
| Watchdog Timeout | 1.6s (long) or 100ms (short); configurable via OSC SEL/OSC IN; prevents runaway code execution with deterministic recovery. |
| Battery Switchover Threshold | VCC − VBATT = 70mV (rising), 50mV (falling); 20mV hysteresis prevents chatter during slow VCC decay near VBATT. |
| CE OUT Propagation Delay | 50ns (typical); enables fast, glitch-free disabling of RAM writes during power transitions without external logic. |
| Supply Current (Battery Mode) | 0.6–1.0µA; extends lithium backup battery life beyond 10 years in low-power memory retention applications. |
| PFI Threshold | 1.3V (±0.1V); allows flexible power-fail warning using external resistor divider on unregulated or regulated rails. |
Pinout & Package
MAX693CWE+ is housed in a 16-pin SOIC (Wide) package (W suffix), 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; monitored for reset generation and CE gating enable. |
| 2 | VBATT | Backup battery input (2.0V–4.0V); powers VOUT when VCC fails; sources <1µA standby current. |
| 3 | VOUT | Switched output (VCC or VBATT); supplies up to 50mA to CMOS RAM; requires ≥0.1µF bypass capacitor. |
| 4 | GND | Ground reference for all analog/digital functions; common return for VCC, VBATT, and outputs. |
| 5 | BATT ON | Active-low battery switchover indicator; sinks 25mA to drive external PNP transistor base during backup mode. |
| 6 | LOW LINE | Fast-reset comparator output; goes low immediately when VCC falls below 4.4V - no timeout delay. |
| 7 | OSC IN | Oscillator input; accepts external clock (0–250kHz) or capacitor (e.g., 47pF) to adjust reset/watchdog timing. |
| 8 | OSC SEL | Oscillator mode select; floating/high = internal oscillator; low = external clock/capacitor mode; 3µA internal pullup. |
| 9 | PFI | Power-fail comparator noninverting input; referenced to 1.3V internal bandgap; used for early warning or low-battery detect. |
| 10 | PFO | Power-fail output; open-drain, active-low; asserts NMI or triggers alarm when PFI < 1.3V. |
| 11 | WDI | Three-level watchdog input; toggling required every 100ms/1.6s; floating = watchdog disabled; mid-supply = inactive. |
| 12 | CE IN | Chip-enable gating input; buffered to CE OUT only when VCC > 4.4V; connect to GND if unused. |
| 13 | CE OUT | Controlled chip-enable output; follows CE IN when VCC valid; forced high during brownout to block RAM writes. |
| 14 | WDO | Watchdog output; active-low; remains low until next WDI transition; signals watchdog timeout independently of RESET. |
| 15 | RESET | Active-low reset output; asserted for 50ms/200ms after VCC recovery or WDI timeout; drives µP reset pin directly. |
| 16 | RESET | Active-high reset output; inverted complement of pin 15; eliminates need for external inverter in some µP interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset & Watchdog Timing | Configurable via OSC SEL/OSC IN - supports 100ms/1.6s watchdog and 50ms/200ms reset delays without external components. |
| CMOS RAM Write Protection | CE OUT forces high within 50ns when VCC < 4.4V, blocking erroneous writes during power-up/down/brownout events. |
| Battery Backup Switching | VOUT automatically selects higher of VCC or VBATT; 200Ω MOSFET enables low-dropout switchover with 1µA standby current. |
| Dual-Mode Power-Fail Detection | 1.3V comparator (PFI/PFO) works with external dividers to warn of power failure or low battery - with automatic disable when VCC < VBATT. |
| Low-Power Battery Operation | 0.6–1.0µA supply current in backup mode; 10nA typical charging current at VBATT extends lithium cell shelf life. |
Applications
| Industrial Controller Power Management | Automotive Telematics Data Retention |
|---|---|
|
Use Scenario: PLCs and motion controllers require guaranteed reset assertion and RAM protection during engine cranking-induced 5V rail sag (down to 3.8V). IC Role / Device Role / Timing Role: MAX693CWE+ monitors VCC, asserts RESET for 50ms upon recovery, disables CE OUT during brownout, and switches VOUT to VBATT to retain RTC and configuration data. Use Value: Prevents firmware corruption and preserves critical operational parameters across repeated 12V battery dips without external supervision logic. |
Use Scenario: Telematics units store GPS logs and crash data in battery-backed SRAM during vehicle ignition-off periods. IC Role / Device Role / Timing Role: MAX693CWE+ provides 1µA battery standby current, detects low battery via PFI, asserts PFO to trigger data flush before VBATT drops below 2.5V. Use Value: Enables >5-year backup runtime with CR2032 coin cell while ensuring data integrity through controlled shutdown sequence. |
| Medical Infusion Pump Safety Monitoring | Smart Meter Firmware Recovery |
|
Use Scenario: Infusion pumps must restart safely after AC power interruption, with no risk of unintended dose delivery during reset. IC Role / Device Role / Timing Role: MAX693CWE+ uses WDI to verify software liveness; issues 50ms RESET pulse if motor control loop stalls; LOW LINE triggers immediate fault logging. Use Value: Meets IEC 62304 Class C safety requirements by enforcing deterministic watchdog recovery and brownout response. |
Use Scenario: Smart meters experience frequent grid voltage fluctuations; firmware must survive brownouts and resume metering without data loss. IC Role / Device Role / Timing Role: MAX693CWE+ asserts RESET for 200ms after VCC recovery, gates CE OUT to freeze RAM writes, and uses BATT ON to boost VOUT current for EEPROM commit. Use Value: Guarantees atomic write completion to nonvolatile storage even during sub-cycle interruptions, meeting ANSI C12.1 compliance. |
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 functionality and pinout, but in 16-pin NSOIC (narrow) package (SA suffix); 3.9mm body width vs. 7.5mm for WE+. | Preferred for space-constrained PCBs where SOIC-W footprint is prohibitive; thermal performance slightly reduced due to smaller pad area. | Select MAX693CSA+ when board area is limited and thermal load is moderate; verify solder reflow profile compatibility with narrow-body SOIC. |
| MAX695CWE+ | Identical package and pinout; differs in reset threshold (4.65V vs. 4.4V) and default reset timeout (200ms only, not selectable). | Suitable for systems powered by tightly regulated 5V ±5% rails where higher reset threshold improves noise immunity. | Choose MAX695CWE+ for 5V ±5% supplies needing fixed 200ms reset hold time and no watchdog adjustment; not drop-in for 4.4V threshold requirement. |
Compared with MAX693CSA+ and MAX695CWE+, the MAX693CWE+ uniquely combines 4.4V reset threshold, selectable 50ms/200ms reset delay, and full oscillator configurability - making it optimal for industrial designs requiring flexibility across varying input tolerances and timing constraints.
Availability
MAX693CWE+ is available at Aetrix Electronics and suitable for industrial controllers, automotive telematics modules, medical infusion pumps, and smart meter designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX693CWE+ 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 communications applications.
The MAX690–MAX695 family was engineered to replace discrete reset, watchdog, and battery-switch circuits in µP-based systems - delivering integrated reliability, low quiescent current, and configurable timing for mission-critical embedded control.
FAQ
What is the reset threshold voltage of the MAX693CWE+ and how does it behave under temperature variation?
The MAX693CWE+ has a guaranteed reset threshold of 4.25V (min) to 4.5V (max) over its full operating range (–40°C to +85°C), with a typical value of 4.4V. This 4.4V threshold is optimized for 5V ±10% power supplies. The device includes 40mV of built-in hysteresis to prevent oscillation during slow VCC transitions. Temperature drift is fully characterized in the datasheet and remains within specification across the entire industrial temperature range - no derating or external compensation is required for MAX693CWE+ operation.
Can the MAX693CWE+ be used with a 3.3V microprocessor system?
No - the MAX693CWE+ is designed exclusively for 5V systems. Its reset comparator is trimmed for 4.4V threshold, its VCC operating range is 4.5V to 5.5V, and its outputs (RESET, CE OUT, WDO) are specified to drive 5V logic levels. Using it with a 3.3V µP risks incorrect reset assertion, insufficient output voltage swing, and potential damage due to overvoltage on inputs like CE IN or WDI. For 3.3V systems, consider the MAX6361 or MAX6326 families instead of the MAX693CWE+.
How does the CE OUT function protect RAM during power failure, and what is its timing behavior?
The MAX693CWE+ CE OUT forces a high output within 50ns (typical) whenever VCC falls below 4.4V - regardless of CE IN state - thereby disabling writes to battery-backed CMOS RAM or EEPROM. This occurs faster than the 50ms RESET pulse, ensuring data integrity before the µP enters reset. CE OUT remains high until VCC rises above 4.75V (max threshold), preventing premature write re-enabling. This behavior is intrinsic to the MAX693CWE+ silicon and requires no external components - unlike solutions using discrete logic or µP-controlled gating.
What are the exact conditions under which the MAX693CWE+ asserts the BATT ON output?
The MAX693CWE+ asserts BATT ON (drives low) only when VOUT is internally switched to VBATT - i.e., when VBATT > VCC by at least 50mV (falling VCC) or 70mV (rising VCC). BATT ON remains low during battery backup mode and goes high again once VCC exceeds VBATT by the switchover hysteresis margin. It is rated to sink 25mA continuously and can directly drive the base of an external PNP pass transistor to extend VOUT current capability beyond the internal 50mA limit - a feature absent in 8-pin MAX690-series devices.
Is the MAX693CWE+ pin-compatible with other devices in the MAX690–MAX695 family?
The MAX693CWE+ is pin-compatible with MAX691CWE+ and MAX695CWE+ (all 16-pin SOIC-W), sharing identical pin assignments for VCC, VBATT, VOUT, GND, RESET, WDI, PFI, PFO, CE IN, CE OUT, BATT ON, LOW LINE, WDO, OSC SEL, and OSC IN. However, it is not pin-compatible with 8-pin variants (e.g., MAX692) or narrow-body SOIC versions (e.g., MAX693CSA+), nor with devices having different reset thresholds (e.g., MAX695's 4.65V) - though mechanical fit may appear similar, electrical behavior differs critically.
MAX693CWE+ 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:
- 4.4V
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX693CWE+ FAQ
1.How can I place an order for MAX693CWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693CWE+ 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 MAX693CWE+ reliable?
The price and inventory of MAX693CWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693CWE+ is usually 5 days.
3.What payment methods are accepted for MAX693CWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693CWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693CWE+?
MAX693CWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693CWE+ 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 MAX693CWE+?
For technical support, including MAX693CWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693CWE+ requirements.
6.How does Aetrix verify that MAX693CWE+ is sourced from the original manufacturer or authorized distributors?
All MAX693CWE+ 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 MAX693CWE+ meets industry standards.
7.What is the process for return or replacement of MAX693CWE+?
All MAX693CWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX693CWE+, 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 MAX693CWE+ part is unused and in its original packaging.
Return procedure for MAX693CWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX693CWE+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
