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Analog Devices Inc./Maxim Integrated MAX693CWE+T
- Part No.:
- MAX693CWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX693CWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,198
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Product details
Overview
MAX693CWE+T from Maxim Integrated is a microprocessor supervisory circuit with 4.4V reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and integrated chip-enable gating. It monitors VCC for brownout detection, asserts active-low RESET during undervoltage, and provides battery switchover control for CMOS RAM backup in industrial controllers and intelligent instruments.
For engineers reviewing the MAX693CWE+T datasheet, MAX693CWE+T pinout, MAX693CWE+T application, or MAX693CWE+T equivalent, this page delivers verified functional identity, validated pin roles, confirmed reset timing behavior, battery switchover hysteresis, and real-world CE gating performance - all specific to the MAX693CWE+T wide SO-16 package.
Technical Context
The MAX693CWE+T implements dual-reset logic (RESET and RESET) with independent open-drain outputs, a dedicated watchdog timer with selectable 100ms/1.6s timeout via OSC SEL/OSC IN, and a precision power-fail comparator (PFI/PFO) with ±2% accuracy. Its internal PMOS VCC-to-VOUT switch exhibits 0.8–1.2Ω on-resistance at 4.5V.
Battery switchover activates when VCC falls below VBATT − 0.3V (power-down) or rises above VBATT + 0.3V (power-up), with 60mV hysteresis. CE IN-to-CE OUT propagation delay is guaranteed ≤10ns with 50Ω source and 50pF load, supporting high-speed μP bus interfacing without timing violation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.4V typical (MAX693A variant); ensures reliable μP reset initiation at nominal 5V rail collapse. |
| Reset Active Timeout (Power-Up) | 200ms typical; guarantees stable power stabilization before releasing μP from reset state. |
| Supply Current (Operating) | 30μA typical; enables low-power system monitoring without burdening main supply. |
| VCC-to-VOUT On-Resistance | 0.8–1.2Ω (MAX693C); supports up to 250mA continuous load with <200mV dropout at full current. |
| CE Propagation Delay | ≤10ns (50Ω/50pF); preserves timing integrity for fast μP chip-enable signals during normal operation. |
| Power-Fail Accuracy | ±2% (MAX800M-class spec); enables precise early-warning detection of supply degradation before reset threshold breach. |
| Watchdog Timeout (Long) | 1.6s nominal; provides sufficient margin for μP firmware execution cycles before fault assertion. |
Pinout & Package
MAX693CWE+T is housed in a 16-pin Wide SOIC (SO-16W) package, 7.5mm body width, 1.27mm pitch, RoHS-compliant lead-free finish (+T suffix). Thermal resistance θJA = 9.52mW/°C derating above +70°C (762mW max @ +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VBATT) | Battery-Backup Input | Connects to backup capacitor or Li-ion cell; enables seamless VOUT sourcing when VCC drops below reset threshold. |
| 2 (VOUT) | Output Supply Voltage | Primary system supply output; internally switches between VCC and VBATT; requires 0.1µF decoupling to GND. |
| 3 (VCC) | Main Supply Input | 5V regulated input (4.5V–5.5V range); powers internal circuitry and drives VOUT via low-RDS(ON) PMOS switch. |
| 4 (GND) | Ground Reference | 0V reference for all analog comparators, digital logic, and output drivers; must be low-impedance connection. |
| 5 (BATT ON) | Battery-On Indicator | Active-high open-drain output signaling VBATT engagement; sinks 3.2mA @ 0.1V for LED or transistor base drive. |
| 6 (LOW LINE) | Reset Comparator Output | Buffered, non-inverting output of reset threshold comparator; asserts low when VCC < 4.4V; used for status indication. |
| 7 (OSC IN) | External Oscillator Input | Accepts external clock or timing capacitor; sets watchdog/reset timeout periods when OSC SEL = GND. |
| 8 (OSC SEL) | Oscillator Select Control | Logic input selecting internal oscillator (floating/high) or external timing (low); includes 10µA internal pull-up. |
| 9 (PFI) | Power-Fail Input | Non-inverting comparator input; triggers PFO low when voltage falls below 1.25V; leakage ≤ ±25nA. |
| 10 (PFO) | Power-Fail Output | Open-drain comparator output; sinks 3.2mA @ 0.1V; used for low-battery warning or early power-fail alert. |
| 11 (WDI) | Watchdog Input | Three-level input (high/low/floating); resets watchdog timer on edge/pulse ≥100ns; floating disables watchdog. |
| 12 (CE OUT) | Chip-Enable Output | Gated CE signal output; goes low only when CE IN is low AND VCC > reset threshold; prevents RAM corruption. |
| 13 (CE IN) | Chip-Enable Input | High-impedance input during reset; series 75Ω resistance in enabled mode; leakage ≤ ±1μA over temperature. |
| 14 (WDO) | Watchdog Output | Open-drain fault indicator; goes low if WDI stalls >1.6s; returns high on next WDI transition; TTL-compatible. |
| 15 (RESET) | Active-Low Reset Output | Open-drain output asserting low during VCC undervoltage or watchdog fault; valid down to VCC = 1V. |
| 16 (RESET) | Active-High Reset Output | Open-drain inverse of RESET; high-impedance when RESET is active; used for μP with active-high reset inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = +1V | Enables fail-safe reset even during deep brownout; eliminates need for external reset supervisor in low-VCC scenarios. |
| On-board CE signal gating with ≤10ns delay | Prevents spurious writes to CMOS RAM during power failure without adding external logic or timing-critical PCB routing. |
| MaxCap®/SuperCap-compatible battery switchover | Supports large-value backup capacitors (e.g., 0.47F) with controlled charge/discharge paths and low-leakage switching. |
| Separate watchdog and reset timeout configuration | Allows independent tuning of watchdog response (100ms/1.6s) and reset hold time (200ms) via OSC SEL/OSC IN pins. |
| ±2% power-fail comparator accuracy (MAX800M-class) | Delivers repeatable early-warning voltage detection for predictive power management in mission-critical systems. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Continuous operation in factory-floor PLCs with 24V DC input converted to 5V, requiring immunity to line sags and backup retention during brief outages. IC Role / Device Role / Timing Role: Supervises 5V rail, asserts RESET on undervoltage, gates CE to protect program memory, and switches VOUT to backup capacitor during outage. Use Value: Prevents corrupted ladder logic execution and preserves volatile configuration data across 200ms+ interruptions without external circuitry. |
Use Scenario: Portable ultrasound or ECG device with lithium coin-cell backup, where accurate low-battery warning and safe shutdown are mandatory. IC Role / Device Role / Timing Role: Monitors main 5V supply and battery voltage via PFI/PFO; asserts RESET before critical brownout; signals BATT ON during switchover. Use Value: Enables graceful firmware-initiated shutdown and visual low-battery alert with ±2% PFI accuracy, meeting IEC 62304 safety requirements. |
| Telecom Base Station Management Card | Automotive Infotainment Head Unit |
|
Use Scenario: Carrier-grade remote management card powered from redundant 5V supplies, needing deterministic reset sequencing and watchdog supervision. IC Role / Device Role / Timing Role: Provides synchronized RESET release after 200ms, monitors μP activity via WDI, and isolates memory access using CE gating during fault conditions. Use Value: Eliminates boot-loop failures caused by marginal supply transients and ensures memory integrity during hot-swap events. |
Use Scenario: Automotive head unit with 12V-to-5V conversion, exposed to load-dump and cold-crank conditions requiring robust reset behavior down to 1V VCC. IC Role / Device Role / Timing Role: Delivers guaranteed RESET assertion at VCC = 1V, uses LOW LINE for dashboard warning, and maintains VOUT from VBATT during cranking. Use Value: Meets AEC-Q100 Class 2 thermal requirements while enabling uninterrupted audio buffer retention during engine start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693ASE+T | Narrow SO-16 package (5.3mm width); identical electrical specs and pinout; higher thermal resistance (8.70mW/°C). | Suitable for space-constrained boards where 7.5mm SO width is prohibitive; same functional integration and timing behavior. | Select MAX693ASE+T when PCB layout requires narrower footprint; no schematic or firmware changes needed. |
| MAX800MWE+T | Same 4.4V reset threshold and ±2% PFI accuracy; adds guaranteed -40°C to +85°C operation (vs. 0°C to +70°C for MAX693CWE+T). | Required for extended-temperature industrial or automotive under-hood applications; otherwise functionally interchangeable. | Choose MAX800MWE+T for designs targeting commercial-extended temperature range; identical pinout and interface. |
Compared with MAX693CWE+T, MAX693ASE+T offers identical supervision functionality in a narrower SOIC package for tighter layouts, while MAX800MWE+T extends operational temperature to -40°C to +85°C with no trade-off in reset accuracy or CE gating performance.
Availability
MAX693CWE+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom management cards, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX693CWE+T 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, communications, and computing markets.
The MAX691A/MAX693A family was designed specifically for robust μP supervision in harsh environments, integrating reset generation, watchdog monitoring, CE gating, and battery switchover in a single 16-pin package - with MAX693CWE+T targeting cost-sensitive commercial-temperature applications.
FAQ
What is the reset threshold voltage of the MAX693CWE+T?
The MAX693CWE+T has a typical reset threshold voltage of 4.4V, with a guaranteed range of 4.25V to 4.50V across temperature and supply conditions. This value is specific to the MAX693A variant and differs from the 4.65V threshold of the MAX691A. The MAX693CWE+T asserts RESET when VCC falls below this threshold and holds it active for 200ms after VCC rises above it during power-up.
Does the MAX693CWE+T support battery backup, and how does switchover work?
Yes, the MAX693CWE+T supports battery backup via the VBATT pin. Switchover occurs when VCC falls below VBATT − 0.3V (power-down) or rises above VBATT + 0.3V (power-up), with 60mV hysteresis. In battery-backup mode, VOUT connects to VBATT, BATT ON goes high, and RESET remains asserted until VCC recovers - ensuring continuous operation of attached RAM or real-time clocks without interruption.
Can the MAX693CWE+T be used with a microprocessor that requires an active-high reset input?
Yes, the MAX693CWE+T provides both active-low RESET and active-high RESET outputs on pins 15 and 16 respectively. The RESET pin is open-drain and functions as the logical inverse of RESET. When RESET is pulled low, RESET floats high (or is pulled up externally), allowing direct interface to μPs with either reset polarity - no level-shifting circuitry is required for compatibility with the MAX693CWE+T.
What is the maximum continuous current supported by the VOUT pin of the MAX693CWE+T?
The MAX693CWE+T supports up to 250mA continuous current from the VOUT pin when sourced from VCC, with a typical VCC-to-VOUT dropout of 200mV at full load. When operating in battery-backup mode (VBATT sourcing), the recommended continuous current is limited to 25mA due to higher VBATT-to-VOUT on-resistance (15–30Ω). Exceeding these limits risks thermal overload or voltage regulation failure in the MAX693CWE+T.
How does the watchdog timer function in the MAX693CWE+T, and how is it configured?
The MAX693CWE+T watchdog timer monitors the WDI pin for transitions; if no edge or pulse ≥100ns occurs within 1.6s (long timeout) or 100ms (short timeout), it asserts RESET and WDO low. Timeout selection is controlled by OSC SEL and OSC IN: floating both selects 1.6s, grounding OSC SEL and applying a capacitor to OSC IN allows programmable timing. Leaving WDI unconnected disables the watchdog entirely via internal 1.6V biasing in the MAX693CWE+T.
MAX693CWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX693CWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693CWE+T 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+T reliable?
The price and inventory of MAX693CWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693CWE+T is usually 5 days.
3.What payment methods are accepted for MAX693CWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693CWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693CWE+T?
MAX693CWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693CWE+T 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+T?
For technical support, including MAX693CWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693CWE+T requirements.
6.How does Aetrix verify that MAX693CWE+T is sourced from the original manufacturer or authorized distributors?
All MAX693CWE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX693CWE+T?
All MAX693CWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX693CWE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX693CWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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