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Analog Devices Inc./Maxim Integrated MAX693EWE+T
- Part No.:
- MAX693EWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX693EWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,922
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Product details
Overview
MAX693EWE+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 supports battery switchover down to 1V VCC - used in industrial controllers and intelligent instrumentation requiring reliable power sequencing and watchdog supervision.
For engineers reviewing the MAX693EWE+T datasheet, MAX693EWE+T pinout, MAX693EWE+T application, or MAX693EWE+T equivalent, this page delivers verified specifications, validated pin functions, confirmed backup-battery behavior, and real-world timing characteristics for μP reset coordination, CE signal protection, and power-fail warning implementation.
Technical Context
The MAX693EWE+T implements dual-reset outputs (RESET and RESET), a 1.6s nominal watchdog timeout with selectable short/long modes via OSC SEL/OSC IN, and a dedicated power-fail comparator (PFI/PFO) with ±2% accuracy. Its internal PMOS VCC-to-VOUT switch exhibits 0.8–1.2Ω on-resistance, while VBATT-to-VOUT path uses higher impedance (15–30Ω) optimized for low-current backup.
Chip-enable gating operates as a transmission gate (75–150Ω enabled resistance, ≤10ns propagation delay), disabled automatically during reset assertion to prevent RAM corruption. Battery switchover activates when VCC falls below VBATT − 0.3V and remains below reset threshold (4.4V), forcing VOUT to VBATT and asserting both RESET outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.4V typical (MAX693A variant); ensures reliable μP reset initiation at VCC < 4.4V |
| Reset Timeout Period | 200ms typical after power-up; guarantees stable VCC before releasing μP from reset |
| Supply Current (Operating) | 30μA typical; enables low-power system monitoring without significant load on 5V rail |
| VCC-to-VOUT On-Resistance | 0.8–1.2Ω (MAX693A); sustains ≤250mA load with <200mV dropout at full current |
| Battery Switchover Threshold | VCC < VBATT − 0.3V (power-down); cleanly transitions VOUT source from VCC to VBATT |
| Watchdog Timeout (Long) | 1.6s nominal; detects μP lockup without requiring external timing components |
| PFI Input Threshold | 1.25V typical; provides accurate early-warning voltage monitoring independent of reset function |
Pinout & Package
MAX693EWE+T is housed in a 16-pin Wide SO (SOIC-W) package, 7.5mm × 10.3mm body, 1.27mm pitch, RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-Backup Input | Accepts 2.0–5.5V backup source; enables VOUT continuity when VCC fails |
| 2 VOUT | Output Supply Voltage | Switched output sourced from VCC or VBATT; powers downstream logic and supplies internal bias |
| 3 VCC | Main Supply Input | 5V nominal input (4.5–5.5V range); monitored for reset assertion and CE gating control |
| 4 GND | Ground Reference | 0V return for all analog and digital functions; must be low-impedance for reset timing stability |
| 5 BATT ON | Battery-On Status Output | Open-drain high-active signal indicating VBATT is active source of VOUT |
| 6 LOW LINE | Reset Comparator Buffer | Active-low buffered copy of reset comparator output; usable for system status indication |
| 7 OSC IN | Oscillator Timing Input | Accepts external capacitor or clock; sets watchdog/reset timeout periods when OSC SEL = GND |
| 8 OSC SEL | Oscillator Mode Select | Logic-high = internal oscillator (1.6s/200ms default); logic-low = external timing control |
| 9 PFI | Power-Fail Input | Non-inverting input to uncommitted comparator; triggers PFO low when voltage <1.25V |
| 10 PFO | Power-Fail Output | Open-drain output tied to PFI comparator; sinks 3.2mA at 0.1V for low-battery alerts |
| 11 WDI | Watchdog Input | Three-level input (high/low/floating); resets watchdog timer on each valid transition ≥100ns |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; disabled during reset to prevent spurious writes to CMOS RAM/EEPROM |
| 13 CE IN | Chip-Enable Input | High-impedance when reset asserted; series 75Ω resistance when enabled for minimal delay |
| 14 WDO | Watchdog Output | Active-low watchdog fault indicator; goes low if WDI stalls >1.6s and holds until next WDI edge |
| 15 RESET | Active-Low Reset Output | Open-drain output; guaranteed valid down to VCC = 1V; requires external pullup for μP reset |
| 16 RESET | Active-High Reset Output | Open-drain inverse of RESET; high-impedance when inactive, sinks 3.2mA when asserted |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = +1V | Enables robust reset signaling even during deep brownout, eliminating need for external supervisor fallback |
| On-board CE signal gating with ≤10ns delay | Prevents memory corruption during power failure without adding external logic or layout complexity |
| MaxCap®/SuperCap-compatible battery switchover | Supports low-ESR backup capacitors up to 0.47F; eliminates need for discrete diode or MOSFET OR-ing |
| ±2% power-fail accuracy (MAX800L/M variant) | Delivers precise low-voltage warning for battery-backed systems without calibration or trimming |
| Dual-reset outputs (RESET / RESET) | Directly interfaces μPs requiring either active-high or active-low reset inputs without level-shifting |
| Configurable watchdog timeout (100ms / 1.6s) | Allows optimization for fast-recovery systems or long-latency firmware execution paths |
Applications
| Industrial Controller Power Monitoring | Intelligent Instrument Data Retention |
|---|---|
|
Use Scenario: PLC or motion controller maintaining operation during brief AC line sags or DC supply dips. IC Role / Device Role / Timing Role: Supervises 5V VCC rail, asserts RESET for 200ms after recovery, gates CE to protect configuration EEPROM during brownout. Use Value: Prevents corrupted parameter writes and ensures deterministic boot sequence after transient faults. |
Use Scenario: Handheld multimeter preserving calibration data and user settings during battery replacement. IC Role / Device Role / Timing Role: Switches VOUT from main supply to backup capacitor (VBATT), maintains RAM power, signals switchover via BATT ON. Use Value: Enables zero-interruption data retention without external power-path MOSFETs or diodes. |
| Critical μP Power Monitoring | Computer System Health Management |
|
Use Scenario: Medical diagnostic device requiring fail-safe reset behavior under strict IEC 60601 power integrity rules. IC Role / Device Role / Timing Role: Monitors VCC with 4.4V threshold and 15mV hysteresis; guarantees RESET validity down to 1V. Use Value: Meets safety-critical reset timing and voltage-margin requirements without design margin overhead. |
Use Scenario: Embedded server management controller detecting early power degradation before system crash. IC Role / Device Role / Timing Role: Uses PFI/PFO comparator to trigger alert at 1.25V reference; independent of reset threshold. Use Value: Provides predictive power-fail warning with ±2% accuracy, enabling graceful shutdown or log capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693ASE+ | Narrow SO-16 package (5.3mm width); identical electrical specs and pinout | Preferred for space-constrained PCBs where 7.5mm SOIC-W footprint is prohibitive | Select MAX693ASE+ when board area is limited and thermal dissipation allows narrower package |
| MAX800MESE+ | Same 4.4V reset threshold and -40°C to +85°C temp grade; adds ±2% PFI accuracy guarantee | Required where power-fail warning must meet tight tolerance without external calibration | Choose MAX800MESE+ when PFI accuracy is critical and extended temperature operation is needed |
Compared with MAX693EWE+T, MAX693ASE+ offers identical functionality in a smaller SOIC footprint but lower power dissipation rating (696mW vs. 762mW), while MAX800MESE+ extends PFI accuracy to ±2% and shares the same industrial temperature range - making it suitable for precision power-monitoring designs where MAX693EWE+T's standard PFI tolerance (±0.05V) is insufficient.
Availability
MAX693EWE+T is available at Aetrix Electronics and suitable for industrial controllers, intelligent instrumentation, and critical μP power monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX693EWE+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) designs precision analog, mixed-signal, and power-management ICs for industrial, computing, and communications systems.
The MAX691A/MAX693A family delivers integrated power supervision, watchdog, and memory protection for 5V μP systems - targeting applications where reliability, low quiescent current, and battery switchover are essential.
FAQ
What is the reset threshold voltage of the MAX693EWE+T?
The MAX693EWE+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 MAX693EWE+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 MAX693EWE+T support battery backup operation?
Yes, the MAX693EWE+T supports battery backup mode when VCC falls below both the reset threshold (4.4V) and VBATT − 0.3V. In this state, VOUT switches from VCC to VBATT, BATT ON goes high, and RESET/RESET remain asserted. The device draws only 0.04–1µA from VBATT in backup mode, enabling multi-day retention with typical supercapacitors.
How does the watchdog function work on the MAX693EWE+T?
The MAX693EWE+T watchdog monitors the WDI pin: if WDI remains static (high or low) longer than the timeout period (1.6s nominal, configurable to 100ms), WDO goes low and RESET/RESET are asserted for 200ms. Leaving WDI floating disables the watchdog via internal 1.6V bias. The MAX693EWE+T requires no external components for basic watchdog operation.
Can the MAX693EWE+T be used with a 3.3V microprocessor?
No - the MAX693EWE+T is specified for 4.5V to 5.5V VCC operation and its RESET outputs are referenced to VOUT (tied to VCC or VBATT). Driving a 3.3V μP reset input directly risks overvoltage. Interface requires a level-shifter or external pullup to 3.3V with open-drain RESET, or use of the MAX693EWE+T solely for 5V-domain supervision with separate 3.3V supervisor.
What is the purpose of the CE IN and CE OUT pins on the MAX693EWE+T?
The CE IN and CE OUT pins implement hardware-enforced chip-enable gating: during normal operation, CE IN passes through to CE OUT with ≤10ns delay; when RESET is asserted, CE OUT is disabled to prevent spurious writes to CMOS RAM or EEPROM. This eliminates software-based write-protection vulnerabilities and ensures data integrity during power faults - a core function of the MAX693EWE+T.
MAX693EWE+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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX693EWE+T FAQ
1.How can I place an order for MAX693EWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693EWE+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 MAX693EWE+T reliable?
The price and inventory of MAX693EWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693EWE+T is usually 5 days.
3.What payment methods are accepted for MAX693EWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693EWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693EWE+T?
MAX693EWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693EWE+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 MAX693EWE+T?
For technical support, including MAX693EWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693EWE+T requirements.
6.How does Aetrix verify that MAX693EWE+T is sourced from the original manufacturer or authorized distributors?
All MAX693EWE+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 MAX693EWE+T meets industry standards.
7.What is the process for return or replacement of MAX693EWE+T?
All MAX693EWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX693EWE+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 MAX693EWE+T part is unused and in its original packaging.
Return procedure for MAX693EWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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