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Analog Devices Inc./Maxim Integrated MAX693AESE+T
- Part No.:
- MAX693AESE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX693AESE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,480
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Product details
Overview
MAX693AESE+T from Maxim Integrated is a microprocessor supervisory circuit designed for critical 5V power monitoring and system reset control in industrial controllers and intelligent instruments. It features a 4.4V typical reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and guaranteed RESET assertion down to VCC = 1V - enabling reliable brownout recovery in embedded systems with battery backup.
For engineers reviewing the MAX693AESE+T datasheet, MAX693AESE+T pinout, MAX693AESE+T application, or MAX693AESE+T equivalent, this device delivers verified power-fail accuracy (±2%), chip-enable signal gating with ≤10ns propagation delay, and dual watchdog timeout modes - all in a 16-pin narrow SO package rated for -40°C to +85°C operation.
Technical Context
The MAX693AESE+T integrates a precision voltage monitor, dual reset outputs (active-low RESET and active-high RESET), a programmable watchdog timer with internal/external timing options, and bidirectional chip-enable gating logic. Its battery switchover circuit activates when VCC falls below VBATT − 0.3V and remains valid down to VBATT = 2.0V.
It implements an uncommitted power-fail comparator (PFI/PFO) with 1.25V threshold and 25μs response, independent of reset logic, plus BATT ON status indication and WDI three-level input with 100ns minimum pulse detection - supporting robust μP supervision without external components in most configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.4V typical; ensures deterministic reset assertion during 5V rail brownout before system instability occurs |
| Reset Timeout Period | 200ms typical on power-up; provides sufficient hold time for μP initialization and peripheral stabilization |
| Supply Current (Operating) | 30μA typical; enables low-power supervision in always-on industrial monitoring nodes |
| CE IN-to-CE OUT Propagation Delay | ≤10ns; preserves timing integrity for high-speed memory access paths during normal operation |
| Power-Fail Accuracy | ±2% guaranteed (MAX800M variant); supports precise low-battery warning and early power-loss detection |
| Operating Temperature Range | -40°C to +85°C; qualified for extended industrial environments including factory automation and remote instrumentation |
| VCC-to-VOUT On-Resistance | 0.8–1.4Ω; limits dropout to <200mV at 250mA load, maintaining stable VOUT under full system current |
Pinout & Package
MAX693AESE+T is housed in a 16-pin narrow SO (Small Outline) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, lead-free (+T suffix), and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-backup input | Connects to backup capacitor or Li-ion cell; enables seamless switchover when VCC drops below VBATT − 0.3V |
| 2 VOUT | Output supply voltage | Switched output sourced from VCC or VBATT; powers downstream logic and serves as reference for all open-drain outputs |
| 3 VCC | Main 5V supply input | Regulated 4.5V–5.5V input; monitored for reset generation and CE gating enable/disable control |
| 4 GND | Ground reference | 0V return for all analog and digital functions; must be low-impedance connection to minimize noise coupling |
| 5 BATT ON | Battery-active indicator | Open-drain output pulled high in battery mode; used to drive external PNP base or status LED |
| 6 LOW LINE | Reset comparator buffered output | Active-low signal mirroring VCC vs. 4.4V threshold; usable as standalone power-good flag |
| 7 OSC IN | Oscillator timing input | Accepts external capacitor (for adjustable timeout) or clock signal; sets watchdog/reset periods when OSC SEL = GND |
| 8 OSC SEL | Oscillator mode select | Logic-high = internal oscillator (1.6s/200ms defaults); logic-low = external timing control |
| 9 PFI | Power-fail comparator input | Non-inverting input referenced to 1.25V; detects undervoltage on auxiliary rails or battery discharge |
| 10 PFO | Power-fail comparator output | Open-drain output asserted low when PFI < 1.25V; isolated from reset logic for flexible system alerting |
| 11 WDI | Watchdog input | Three-level input (high/mid/low); resets watchdog timer on any transition ≥100ns; floating = watchdog disabled |
| 12 CE OUT | Gated chip-enable output | Passes CE IN only when VCC > reset threshold; blocks spurious writes during power failure |
| 13 CE IN | Chip-enable input | High-impedance when reset active; series 75Ω resistance when enabled for minimal signal degradation |
| 14 WDO | Watchdog output | Asserts low on watchdog timeout; remains low until next WDI transition; TTL-compatible drive strength |
| 15 RESET | Active-low reset output | Open-drain, sinks 3.2mA @ 0.1V; guaranteed functional down to VCC = 1V for brownout resilience |
| 16 RESET | Active-high reset output | Open-drain inverse of RESET; compatible with μPs requiring active-high reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs (RESET/RESET) | Supports both active-low and active-high μP reset inputs without external inverters or pull-ups |
| Chip-enable gating with ≤10ns delay | Prevents corrupted memory writes during power transients while preserving high-speed bus timing |
| Guaranteed RESET validity to VCC = 1V | Enables fail-safe reset assertion even during deep brownout, eliminating need for external reset ICs |
| ±2% power-fail comparator accuracy | Delivers repeatable low-battery or auxiliary rail failure detection without calibration |
| MaxCap®/SuperCap-compatible backup | Supports large-value backup capacitors (e.g., 0.47F) with controlled switchover and low leakage (<1μA) |
| Configurable watchdog timeout (100ms/1.6s) | Allows optimization for fast-recovery systems or long-latency firmware execution paths |
Applications
| Industrial Controller Supervision | Intelligent Instrument Power Management |
|---|---|
Use Scenario: PLC or motion controller operating in factory environments with fluctuating 5V supplies and battery-backed RAM. IC Role / Device Role / Timing Role: Monitors VCC for brownout, asserts RESET/RESET to halt μP execution, gates CE to prevent RAM corruption, and signals battery switchover via BATT ON. Use Value: Ensures deterministic restart after line sags and preserves configuration data across AC loss using VBATT switchover with <1μA standby draw. |
Use Scenario: Portable multimeter or data logger with EEPROM storage and coin-cell backup. IC Role / Device Role / Timing Role: Detects main supply failure via PFI, triggers PFO alert, maintains VOUT from VBATT, and holds μP in reset until stable power returns. Use Value: Enables accurate low-battery warning (±2% PFI threshold) and extends operational life by preventing write errors during voltage collapse. |
| Critical μP Power Monitoring | Computing System Reset Control |
Use Scenario: Embedded gateway managing secure firmware updates where unintended reboot must be avoided. IC Role / Device Role / Timing Role: Uses WDI to verify μP liveness; asserts RESET on watchdog timeout; employs CE gating to block flash programming during power instability. Use Value: Prevents partial firmware writes and cryptographic key exposure during brownout by combining watchdog supervision with hardware write protection. |
Use Scenario: Industrial PC motherboard requiring coordinated reset sequencing for CPU, memory, and peripherals. IC Role / Device Role / Timing Role: Generates synchronized 200ms RESET pulse on power-up; provides LOW LINE for BIOS power-good handshake; sources VOUT for I/O buffer biasing. Use Value: Eliminates need for discrete RC reset circuits and ensures consistent boot behavior across temperature (-40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693AESE+ | Same functionality and pinout; differs only in packaging - leaded (no +T) vs. lead-free (+T) finish | No functional impact; lead-free compliance required for RoHS-regulated production | Select MAX693AESE+T for new designs targeting RoHS and J-STD-020 moisture sensitivity level 3 compliance |
| MAX800MESE+ | Identical pinout and supervisory functions; guarantees ±2% power-fail accuracy across full temperature range (-40°C to +85°C) | Enhanced PFI/PFO accuracy specification applies across entire operating range, not just +25°C | Choose MAX800MESE+ when system-level power-fail detection must meet ±2% tolerance at temperature extremes |
Compared with MAX693AESE+T, MAX693AESE+ offers identical electrical performance but lacks lead-free finish, while MAX800MESE+ adds tighter power-fail accuracy over temperature - making it preferable for high-reliability instrumentation where PFI threshold stability is critical.
Availability
MAX693AESE+T is available at Aetrix Electronics and suitable for industrial controllers, intelligent instruments, and critical μP power monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX693AESE+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 solutions for industrial, automotive, and communications markets.
The MAX691A/MAX693A family was designed specifically for robust microprocessor supervision in harsh environments - integrating reset generation, watchdog monitoring, power-fail detection, and memory write protection into a single 16-pin IC.
FAQ
What is the reset threshold voltage of the MAX693AESE+T?
The MAX693AESE+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 fixed for the MAX693A variant and distinct from the 4.65V threshold of the MAX691A. The threshold is used to assert RESET and RESET outputs when VCC falls below this level, ensuring deterministic system reset during brownout events.
Does the MAX693AESE+T support battery backup operation?
Yes, the MAX693AESE+T supports battery backup operation via the VBATT pin. When VCC falls below VBATT − 0.3V and also below the 4.4V reset threshold, the device switches VOUT from VCC to VBATT, asserts RESET/RESET, and drives BATT ON high. In this mode, supply current drops to ≤1μA, and VOUT remains valid down to VBATT = 2.0V - enabling continuous operation of backup RAM or real-time clocks.
How does the watchdog function work on the MAX693AESE+T?
The MAX693AESE+T watchdog monitors the WDI pin: if WDI remains static (high or low) longer than the configured timeout (100ms or 1.6s), WDO goes low and RESET/RESET are asserted for 200ms. A ≥100ns transition on WDI resets the timer. Leaving WDI floating disables the watchdog, as an internal divider biases it to ~1.6V. The function remains inactive when VCC is below 4.4V or during battery-backup mode.
Can the MAX693AESE+T be used with a 3.3V microprocessor?
No, the MAX693AESE+T is specified only for 4.5V to 5.5V VCC operation and generates reset thresholds and output levels referenced to its 5V domain. Its RESET and RESET outputs are open-drain and pulled to VOUT (which tracks VCC or VBATT), so interfacing with 3.3V logic requires level-shifting or external pull-up resistors to 3.3V - and the 4.4V reset threshold is incompatible with 3.3V supply monitoring.
What is the purpose of the CE IN and CE OUT pins on the MAX693AESE+T?
The CE IN and CE OUT pins implement hardware-enforced chip-enable gating: CE OUT passes CE IN signals only when VCC is above the 4.4V reset threshold and stable. During power failure or reset assertion, CE OUT is forced high-impedance or actively pulled to VOUT, blocking spurious memory writes. This feature protects CMOS RAM or EEPROM from corruption during brownout, with ≤10ns propagation delay preserving high-speed bus timing.
MAX693AESE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX693AESE+T FAQ
1.How can I place an order for MAX693AESE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693AESE+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 MAX693AESE+T reliable?
The price and inventory of MAX693AESE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693AESE+T is usually 5 days.
3.What payment methods are accepted for MAX693AESE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693AESE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693AESE+T?
MAX693AESE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693AESE+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 MAX693AESE+T?
For technical support, including MAX693AESE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693AESE+T requirements.
6.How does Aetrix verify that MAX693AESE+T is sourced from the original manufacturer or authorized distributors?
All MAX693AESE+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 MAX693AESE+T meets industry standards.
7.What is the process for return or replacement of MAX693AESE+T?
All MAX693AESE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX693AESE+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 MAX693AESE+T part is unused and in its original packaging.
Return procedure for MAX693AESE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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