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Analog Devices Inc./Maxim Integrated MAX693ACWE+T
- Part No.:
- MAX693ACWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX693ACWE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
The MAX693ACWE+T from Maxim Integrated is a microprocessor supervisory circuit designed for critical 5V power monitoring and system reset control in embedded controllers and intelligent instruments. It features a 4.4V typical reset threshold, 200ms power-up reset timeout, 30μA operating supply current, and integrated battery switchover with VCC-to-VOUT on-resistance of 0.8–1.2Ω - enabling reliable RAM backup during brownout events in industrial control systems.
For engineers reviewing the MAX693ACWE+T datasheet, MAX693ACWE+T pinout, MAX693ACWE+T application, or MAX693ACWE+T equivalent, key selection criteria include its guaranteed RESET assertion down to VCC = 1V, ±2% power-fail accuracy (shared with MAX800M), chip-enable gating with ≤10ns propagation delay, and compatibility with MaxCap®/supercapacitor backup solutions.
Technical Context
The MAX693ACWE+T implements dual-reset outputs (active-low RESET and active-high RESET), a watchdog timer with selectable 100ms/1.6s timeout periods via OSC SEL/OSC IN, and a dedicated power-fail comparator (PFI/PFO) independent of reset logic. Its internal PMOS VCC/VBATT switchover circuit activates when VCC falls below VBATT − 0.3V and remains asserted until VCC rises above VBATT + 0.3V, with 60mV hysteresis.
Chip-enable gating uses a 75–150Ω transmission gate between CE IN and CE OUT, supporting ≤50pF load capacitance with 6–10ns propagation delay. The WDI input employs an internal voltage divider biasing to ~1.6V when floating - disabling watchdog functionality by default unless actively toggled by the host μP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.4V typical (MAX693A variant); ensures reliable reset assertion during 5V supply brownout down to 4.25V min. |
| Reset Timeout Period | 200ms typical on power-up; provides sufficient hold time for μP initialization before release. |
| VCC Supply Current | 30μA typical in normal operation; enables low-power system monitoring without burdening main supply. |
| VCC-to-VOUT On-Resistance | 0.8–1.2Ω (MAX693A); supports up to 250mA load with <200mV dropout at full current. |
| Battery Switchover Threshold | VCC < VBATT − 0.3V (power-down); guarantees seamless transition to backup source before VCC crosses reset threshold. |
| Power-Fail Accuracy | ±2% (MAX800M-class spec); enables precise early-warning detection for 5V rail collapse or battery depletion. |
| CE IN-to-CE OUT Propagation Delay | 6–10ns max; preserves timing integrity for high-speed memory access gating during fault conditions. |
Pinout & Package
MAX693ACWE+T is housed in a 16-pin Wide SO (SOIC-W) package with standard 0.3-inch body width and 1.27mm pitch. Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-backup input | Connects to backup capacitor/battery; enables VOUT sourcing when VCC fails below reset threshold. |
| 2 VOUT | Output supply voltage | Primary system supply output; switches between VCC and VBATT based on switchover comparator state. |
| 3 VCC | Main 5V supply input | Regulated 4.5–5.5V input; powers internal circuitry and drives VOUT via low-RDS(ON) PMOS switch. |
| 4 GND | Ground reference | 0V return for all analog/digital functions; must be low-impedance connection to minimize noise coupling. |
| 5 BATT ON | Battery-status indicator | Open-drain output pulled high in battery mode; used to drive external PNP base for >250mA backup loads. |
| 6 LOW LINE | Reset-threshold comparator output | Active-low signal indicating VCC < 4.4V; provides immediate brownout flag independent of reset timing. |
| 7 OSC IN | External oscillator timing input | Accepts capacitor or clock signal to configure watchdog/reset timeouts; biased to ~1.6V when floating. |
| 8 OSC SEL | Oscillator mode select | Drives internal oscillator (floating/high) or enables external timing (low); includes 10μA internal pull-up. |
| 9 PFI | Power-fail comparator input | Non-inverting input referenced to 1.25V; detects supply sag or battery drop with ±25nA leakage. |
| 10 PFO | Power-fail comparator output | Active-low open-drain output; asserts when PFI < 1.25V; unaffected by reset/watchdog states. |
| 11 WDI | Watchdog input | Three-level input (high/low/floating); resets watchdog timer on any 100ns+ transition; disabled when open. |
| 12 CE OUT | Chip-enable gated output | Passes CE IN only when VCC > reset threshold; prevents spurious writes to CMOS RAM during faults. |
| 13 CE IN | Chip-enable gated input | High-impedance during reset; series 75Ω resistance in enabled mode; supports TTL/CMOS logic levels. |
| 14 WDO | Watchdog output | Active-low open-drain output; mirrors RESET assertion during watchdog timeout; high when disabled. |
| 15 RESET | Active-low reset output | Open-drain output valid down to VCC = 1V; requires external pull-up; sinks 3.2mA at 0.1V saturation. |
| 16 RESET | Active-high reset output | Open-drain inverse of RESET; high-impedance when RESET is active; sources 1.6mA at VOUT − 0.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RESET (active-low) and RESET (active-high) provide flexible interface to μPs requiring either polarity, both guaranteed functional down to VCC = 1V. |
| Configurable watchdog timeout | Selectable 100ms (fast recovery) or 1.6s (robust fault detection) via OSC SEL/OSC IN, eliminating need for external timing components. |
| Integrated chip-enable gating | Hardware-enforced CE signal blocking during reset/power failure prevents corrupted writes to volatile memory without software intervention. |
| MaxCap®/supercapacitor compatible | VBATT input supports high-capacitance backup sources (e.g., 0.47F) with controlled switchover and low-leakage (<1μA) standby current. |
| Independent power-fail comparator | PFI/PFO pair delivers ±2% accurate early warning of supply degradation without affecting reset or watchdog behavior. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Programmable logic controllers operating in factory environments with fluctuating 5V supplies and requirement for deterministic boot sequencing after power interruption. IC Role / Device Role / Timing Role: Supervisory IC providing synchronized reset assertion, battery-backed RAM retention, and CE gating to prevent firmware corruption during brownout. Use Value: 200ms reset timeout ensures full μP initialization; 4.4V reset threshold matches industrial 5V rail tolerance; VCC-to-VOUT RDS(ON) <1.2Ω sustains 250mA I/O rail during switchover. |
Use Scenario: Portable ultrasound or patient monitor systems requiring uninterrupted data logging during brief AC power loss or battery swap. IC Role / Device Role / Timing Role: Dual-role supervisor: maintains real-time clock and SRAM via VBATT switchover while generating clean reset for ARM Cortex-M host. Use Value: Guaranteed RESET validity to VCC = 1V enables safe shutdown sequence; ±2% PFI accuracy triggers low-battery alert before critical voltage threshold. |
| Telecom Line Cards | Energy Metering Gateways |
Use Scenario: Carrier-grade line cards with hot-swap capability and strict 5V supply stability requirements across temperature ranges from −40°C to +85°C. IC Role / Device Role / Timing Role: System health monitor asserting reset on VCC sag, detecting power fail via PFI, and gating memory access during transient faults. Use Value: 30μA supply current minimizes standby load; LOW LINE output provides immediate brownout flag for FPGA-based fault logging; TSSOP/SO packaging supports automated assembly. |
Use Scenario: Smart electricity meters deployed in remote locations needing decade-long data retention during grid outages using supercapacitor backup. IC Role / Device Role / Timing Role: Backup power manager interfacing with 0.47F MaxCap® to sustain RTC and EEPROM during extended mains failure. Use Value: VBATT-to-VOUT on-resistance of ≤30Ω at 2.0V enables efficient low-voltage backup; 1μA battery standby current extends supercap lifetime beyond 10 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693AEWE+T | Extended temperature range (−40°C to +85°C) vs. commercial 0°C to +70°C; identical electrical specs and pinout. | Suitable for industrial/outdoor deployments where ambient temperature exceeds 70°C. | Select MAX693AEWE+T for designs requiring operation beyond commercial temperature limits. |
| MAX800MCWE+T | Same 4.4V reset threshold and ±2% power-fail accuracy; adds guaranteed performance over full −40°C to +85°C range and tighter PFI threshold (1.225–1.275V). | Preferred for high-reliability metering or automotive-adjacent applications demanding extended temp validation and improved PFI precision. | Choose MAX800MCWE+T when enhanced power-fail comparator accuracy and extended temperature qualification are required. |
Compared with MAX693ACWE+T, MAX693AEWE+T offers identical functionality with broader temperature support, while MAX800MCWE+T provides tighter PFI tolerance and full industrial temp validation - making it optimal for metrology-grade power monitoring where ±2% accuracy must hold across temperature extremes.
Availability
MAX693ACWE+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, and telecom line cards requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX693ACWE+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 applications.
The MAX691A/MAX693A family was engineered specifically for robust 5V microprocessor supervision - integrating reset generation, watchdog monitoring, battery switchover, and memory protection in a single 16-pin package for space-constrained embedded systems.
FAQ
What is the reset threshold voltage of the MAX693ACWE+T?
The MAX693ACWE+T has a typical reset threshold voltage of 4.4V, with a guaranteed range of 4.25V to 4.50V over temperature. This value is specific to the MAX693A variant and differs from the 4.65V threshold of the MAX691A/MAX800L. The MAX693ACWE+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 MAX693ACWE+T support battery backup operation?
Yes, the MAX693ACWE+T supports battery backup via its VBATT pin. When VCC drops below VBATT − 0.3V and also falls below the 4.4V reset threshold, the device automatically switches VOUT from VCC to VBATT. In this mode, VOUT remains valid down to VBATT = 2.0V, and the MAX693ACWE+T draws only 0.04–1μA from the backup source, enabling multi-year operation with supercapacitors.
How does the watchdog function work on the MAX693ACWE+T?
The MAX693ACWE+T watchdog monitors the WDI pin: if no transition (high→low, low→high, or ≥100ns pulse) occurs within the selected timeout period (100ms or 1.6s), WDO and both RESET outputs are asserted for 200ms. Leaving WDI unconnected disables the watchdog, as an internal divider biases it to ~1.6V - a level ignored by the watchdog comparators.
Can the MAX693ACWE+T be used with a 3.3V microprocessor?
No, the MAX693ACWE+T is designed exclusively for 5V systems, with VCC operating range specified as +4.5V to +5.5V. Its reset threshold (4.4V), PFI reference (1.25V), and output drive levels (e.g., RESET sinking 3.2mA at 0.1V) are optimized for 5V logic families. For 3.3V supervision, consider the MAX6326 or MAX6361 families instead of the MAX693ACWE+T.
What package type is used for the MAX693ACWE+T?
The MAX693ACWE+T is supplied in a 16-pin Wide SO (SOIC-W) package with 0.3-inch body width and 1.27mm lead pitch. This package is RoHS-compliant and lead-free (denoted by the "+T" suffix), and is compatible with standard surface-mount reflow processes. It shares pinout and footprint with other members of the MAX691A/MAX693A family in SOIC-W format.
MAX693ACWE+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:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX693ACWE+T FAQ
1.How can I place an order for MAX693ACWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693ACWE+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 MAX693ACWE+T reliable?
The price and inventory of MAX693ACWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693ACWE+T is usually 5 days.
3.What payment methods are accepted for MAX693ACWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693ACWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693ACWE+T?
MAX693ACWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693ACWE+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 MAX693ACWE+T?
For technical support, including MAX693ACWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693ACWE+T requirements.
6.How does Aetrix verify that MAX693ACWE+T is sourced from the original manufacturer or authorized distributors?
All MAX693ACWE+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 MAX693ACWE+T meets industry standards.
7.What is the process for return or replacement of MAX693ACWE+T?
All MAX693ACWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX693ACWE+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 MAX693ACWE+T part is unused and in its original packaging.
Return procedure for MAX693ACWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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