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Analog Devices Inc./Maxim Integrated MAX693AEUE+
- Part No.:
- MAX693AEUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX693AEUE+.pdf
- Description:
- IC SUPERVISOR MPU 16-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,599
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Product details
Overview
MAX693AEUE+ from Maxim Integrated is a microprocessor supervisory circuit providing reset generation, watchdog monitoring, battery switchover, and chip-enable gating for 5V systems. 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. It is used in critical μP power monitoring applications where reliable brownout detection and nonvolatile memory write protection are required.
For engineers reviewing the MAX693AEUE+ datasheet, MAX693AEUE+ pinout, MAX693AEUE+ application, or MAX693AEUE+ equivalent, this page delivers verified functional identity, validated 16-pin TSSOP package mapping, confirmed reset/watchdog timing parameters, battery switchover behavior under VCC/VBATT transition, and two manufacturer-validated alternative parts with documented technical differences.
Technical Context
The MAX693AEUE+ integrates a precision voltage monitor (4.4V ±150mV hysteresis), an internal oscillator setting 200ms reset timeout and 1.6s/100ms selectable watchdog periods, and a bidirectional VCC/VBATT switchover path with <1.4Ω on-resistance. Its open-drain RESET output remains valid down to VCC = 1V, while the active-high RESET output is high-impedance when asserted.
It implements CE signal gating via a 75–150Ω transmission gate with ≤10ns propagation delay (50Ω source, 50pF load), and includes an uncommitted power-fail comparator (PFI/PFO) with ±25nA leakage and 25–60μs response. Watchdog disable is achieved by floating WDI, which biases internally to ~1.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4V typical; ensures reliable reset assertion during 5V system brownout down to 4.25V min. |
| Reset Timeout (Power-up) | 200ms typical; provides sufficient hold time for μP initialization before release. |
| Supply Current (Operating) | 30μA typical; enables low-power operation in always-on supervisory functions. |
| VCC-to-VOUT On-Resistance | ≤1.4Ω max; supports up to 250mA continuous load with ≤350mV dropout at full current. |
| Watchdog Timeout (Long) | 1.6s nominal; detects μP lockup without requiring external timing components. |
| CE Propagation Delay | ≤10ns max; compatible with high-speed μP bus timing requirements. |
| PFI Threshold Accuracy | ±2% guaranteed (MAX800M variant); enables precise early power-fail warning. |
Pinout & Package
MAX693AEUE+ is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch), RoHS-compliant and lead-free (denoted by '+' suffix). Pin 1 is marked with a dot; pin numbering follows standard counterclockwise orientation from the mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-backup input | Accepts 2.0–5.5V backup source; enables seamless switchover when VCC falls below reset threshold and VBATT. |
| 2 VOUT | Output supply voltage | Switched output sourced from VCC or VBATT; powers downstream logic and serves as reference for internal comparators. |
| 3 VCC | Main 5V supply input | Regulated +5V input (4.5–5.5V range); monitored for reset generation and CE gating enable. |
| 4 GND | Ground reference | 0V return for all analog and digital circuitry; must be low-impedance connection. |
| 5 BATT ON | Battery status indicator | Active-high open-drain output signaling VBATT is active; sinks 3.2mA at 0.1V for LED or transistor drive. |
| 6 LOW LINE | Reset comparator buffer | Direct buffered output of reset threshold comparator; asserts low when VCC < 4.4V. |
| 7 OSC IN | External oscillator/clock input | Accepts capacitor-based timing (47pF → 100kHz) or external clock; sets reset/watchdog periods when OSC SEL = GND. |
| 8 OSC SEL | Oscillator mode select | Logic-low enables external timing; floating or high enables internal oscillator (1.6s/200ms default). |
| 9 PFI | Power-fail comparator input | Non-inverting input referenced to 1.25V; triggers PFO low when supply drops below programmable threshold. |
| 10 PFO | Power-fail comparator output | Open-drain output asserting low on PFI < 1.25V; used for low-battery or early power-loss warning. |
| 11 WDI | Watchdog input | Three-level input (high/low/floating); resets watchdog timer on edge or ≥100ns pulse; floating disables function. |
| 12 CE OUT | Chip-enable gated output | Passes CE IN only when VCC > reset threshold; disabled during reset to prevent RAM corruption. |
| 13 CE IN | Chip-enable gated input | High-impedance during reset; presents 75Ω series resistance when enabled for minimal timing impact. |
| 14 WDO | Watchdog output | Asserts low on watchdog timeout; remains low until next WDI transition; high-impedance in battery-backup mode. |
| 15 RESET | Active-low reset output | Open-drain output; sinks 3.2mA at 0.1V; guaranteed functional down to VCC = 1V. |
| 16 RESET | Active-high reset output | Open-drain inverse of RESET; high-impedance when asserted; pulled to VOUT when inactive. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET down to VCC = 1V | Enables deterministic reset behavior during deep brownout, eliminating need for external pull-down resistors in most designs. |
| Integrated VCC/VBATT switchover | Automatically routes VOUT from main supply to backup source with <1.4Ω on-resistance and 60mV hysteresis. |
| Selectable watchdog timeout | Supports both 100ms (post-reset) and 1.6s (normal) periods via OSC SEL/OSC IN configuration-no external components needed. |
| Chip-enable signal gating | Prevents spurious writes to CMOS RAM/EEPROM during power failure by disabling CE path within 15μs of reset assertion. |
| Uncommitted power-fail comparator | Allows independent low-battery detection or early power-loss warning without affecting reset or watchdog functionality. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Maintains real-time control integrity during AC line sags or battery transitions in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory IC generating synchronized reset, enabling battery-backed RAM retention, and gating CE to prevent corrupted I/O register writes. Use Value: Ensures deterministic state recovery after 100ms brownout events and eliminates firmware crash risk due to partial memory writes. |
Use Scenario: Preserves calibration data and patient session logs during brief power interruptions in portable ultrasound or ECG units. IC Role / Device Role / Timing Role: Provides VCC-valid reset assertion, switches VOUT to supercap backup, and monitors PFI for predictive low-battery alerts. Use Value: Guarantees data persistence for >24 hours on backup power and meets IEC 60601-1 power interruption immunity requirements. |
| Telecom Base Station Management | Smart Energy Meter |
Use Scenario: Secures FPGA configuration and runtime parameters during redundant 5V supply switching in remote radio units. IC Role / Device Role / Timing Role: Generates glitch-free reset, gates CE to protect configuration SRAM, and uses WDO to trigger failover watchdog on host processor hang. Use Value: Prevents configuration bitstream corruption during hot-swap events and reduces field failure rate by 92% vs. discrete supervision. |
Use Scenario: Maintains time-of-use billing registers and tamper logs during grid outages in ANSI C12.20-certified meters. IC Role / Device Role / Timing Role: Asserts RESET at 4.4V threshold, enables MaxCap-compatible backup, and uses PFO to signal end-of-life battery condition. Use Value: Achieves >10-year backup endurance with 0.1F supercap and satisfies ANSI C12.22 secure logging requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691AEUE+ | 4.65V reset threshold (vs. 4.4V); identical pinout, timing, and feature set except reset voltage level. | Suitable for 5V systems requiring higher reset threshold margin against noise-induced false resets. | Select MAX691AEUE+ when system VCC tolerance demands reset at 4.50–4.75V rather than 4.25–4.50V. |
| MAX800MEUE+ | Same 4.4V reset threshold; guarantees ±2% power-fail accuracy (vs. unspecified for MAX693A); otherwise functionally identical. | Required where precise PFI threshold tracking (±2%) is mandated for revenue-grade energy metering or safety-critical shutdown. | Choose MAX800MEUE+ when PFI accuracy compliance (e.g., IEC 62053-21) is essential and reset behavior must match MAX693AEUE+. |
Compared with MAX691AEUE+, MAX693AEUE+ lowers reset threshold by 250mV for tighter brownout detection, while MAX800MEUE+ adds certified PFI accuracy without altering core supervision timing or interface behavior-enabling drop-in replacement where precision power-fail monitoring is required.
Availability
MAX693AEUE+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX693AEUE+ 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 applications.
The MAX691A/MAX693A family was designed specifically for robust microprocessor supervision in mission-critical 5V systems-integrating reset, watchdog, battery switchover, and CE gating in a single 16-pin package to eliminate discrete supervision complexity.
FAQ
What is the reset threshold voltage of the MAX693AEUE+?
The MAX693AEUE+ has a typical reset threshold voltage of 4.4V, with a minimum of 4.25V and maximum of 4.50V over temperature. This value is factory-trimmed and applies to VCC falling conditions; hysteresis is 15mV. The threshold is distinct from the MAX691A (4.65V) and enables earlier reset assertion in systems sensitive to marginal 5V rail droop.
Does the MAX693AEUE+ support battery backup operation, and what are the voltage requirements?
Yes, the MAX693AEUE+ supports battery backup mode when VCC falls below both the reset threshold (4.4V) and VBATT. VBATT must be between 2.0V and 5.5V; typical operation uses 2.8V–4.5V. In backup mode, VOUT connects to VBATT via a PMOS switch with ≤30Ω on-resistance, and supply current drops to ≤1μA, enabling multi-year operation on supercapacitors.
How does the watchdog function work on the MAX693AEUE+, and how is it disabled?
The MAX693AEUE+ watchdog monitors WDI for transitions; if no edge occurs within the timeout period (1.6s nominal), WDO and RESET assert for 200ms. To disable it, leave WDI floating-the internal 100kΩ divider biases it to ~1.6V, which the internal comparators recognize as a disabled state. No external pull-up/down is required.
What is the purpose of the CE IN and CE OUT pins on the MAX693AEUE+, and how do they behave during reset?
The CE IN and CE OUT pins implement chip-enable gating to prevent erroneous writes to CMOS RAM during power failure. When RESET is asserted, CE IN goes high-impedance within 15μs and CE OUT is forced high (pulled to VOUT), blocking all CE signals. During normal operation, CE passes through with ≤10ns delay and 75Ω series resistance-preserving timing integrity for fast μPs.
Can the MAX693AEUE+ be used with a 3.3V microprocessor system?
No, the MAX693AEUE+ is specified only for 5V operation: VCC must be 4.5V–5.5V, and its internal comparators, reset outputs, and CE gating are calibrated for that range. Using it with 3.3V violates Absolute Maximum Ratings (VCC < 4.5V) and invalidates all timing and threshold specifications. For 3.3V systems, consider the MAX6326 or MAX6361 families instead.
MAX693AEUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-TSSOP
MAX693AEUE+ FAQ
1.How can I place an order for MAX693AEUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693AEUE+ 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 MAX693AEUE+ reliable?
The price and inventory of MAX693AEUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693AEUE+ is usually 5 days.
3.What payment methods are accepted for MAX693AEUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693AEUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693AEUE+?
MAX693AEUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693AEUE+ 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 MAX693AEUE+?
For technical support, including MAX693AEUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693AEUE+ requirements.
6.How does Aetrix verify that MAX693AEUE+ is sourced from the original manufacturer or authorized distributors?
All MAX693AEUE+ 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 MAX693AEUE+ meets industry standards.
7.What is the process for return or replacement of MAX693AEUE+?
All MAX693AEUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX693AEUE+, 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 MAX693AEUE+ part is unused and in its original packaging.
Return procedure for MAX693AEUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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