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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc./Maxim Integrated MAX693ACUE+

Name: MAX693ACUE+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX693ACUE+
Price: 2.40 USD
Availability: InStock
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Part No.:: MAX693ACUE+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Supervisors

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: MAX693ACUE+.pdf

Description:: IC SUPERVISOR MPU 16-TSSOP

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Product details

Overview

MAX693ACUE+ 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 embedded controllers and intelligent instruments.

For engineers reviewing the MAX693ACUE+ datasheet, MAX693ACUE+ pinout, MAX693ACUE+ application, or MAX693ACUE+ equivalent, this device delivers verified reset timing accuracy (±15mV hysteresis), guaranteed RESET assertion down to VCC = 1V, battery-backup mode with VBATT-to-VOUT on-resistance ≤30Ω at 2.0V, and 6ns CE propagation delay under 50pF load - critical for reliable μP boot sequencing and data integrity in power-critical systems.

Technical Context

The MAX693ACUE+ implements dual-reset outputs (RESET and RESET), a watchdog timer with selectable 100ms/1.6s timeout periods via OSC SEL/OSC IN, and an uncommitted power-fail comparator (PFI/PFO) with ±25nA input leakage and 25μs response delay. Its internal PMOS VCC/VBATT switchover logic activates when VCC falls below VBATT − 0.3V and the reset threshold (4.4V).

Chip-enable gating uses a 75Ω series transmission gate between CE IN and CE OUT, enabling transparent signal pass-through during normal operation and forced disablement during reset assertion. The BATT ON output sources ~10μA in battery-backup mode and sinks 3.2mA at 0.1V in VCC-active mode, directly indicating switchover status.

Key Specifications

Parameter	Value and Actual Design Meaning
Reset Threshold Voltage	4.40V typical; ensures reliable μP reset initiation at VCC < 4.4V, with 15mV hysteresis preventing chatter during brownout recovery.
Reset Active Timeout (Power-up)	200ms typical; guarantees stable μP initialization window after VCC crosses threshold, validated across −40°C to +85°C.
Supply Current (Operating)	30μA typical; enables low-power system monitoring without compromising battery life in backup mode.
VCC-to-VOUT On-Resistance	0.8–1.2Ω (MAX69_AC); maintains ≤200mV drop at 250mA load, supporting high-current RAM/EEPROM VDD rail switching.
CE IN-to-CE OUT Propagation Delay	6–10ns (50Ω source, 50pF load); preserves timing integrity for fast μP bus cycles while blocking errant writes during power failure.
RESET Output Saturation Voltage	0.1V at 3.2mA sink; ensures robust TTL/CMOS-compatible low-state drive for μP reset inputs even at VCC = 1V.
Power-Fail Comparator Accuracy	±2% (MAX800M variant); provides precise early-warning voltage monitoring for PFI-triggered low-battery or supply degradation alerts.

Pinout & Package

MAX693ACUE+ is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch), RoHS-compliant and lead-free (indicated by '+' suffix). Pin functions are electrically validated per Maxim's official datasheet Rev 14 (2018).

Pin/Terminal	Circuit Role	Design Meaning
1 VBATT	Battery-Backup Input	Accepts 2.0–5.5V backup source; enables seamless switchover when VCC drops below VBATT − 0.3V.
2 VOUT	Output Supply Voltage	Switched output tied to VCC or VBATT; powers external RAM/EEPROM with ≤30Ω VBATT-path resistance at 2.0V.
3 VCC	Main Supply Input	5V nominal input (4.5–5.5V range); powers internal circuitry and drives VOUT via low-R_DS(ON) PMOS switch.
4 GND	Ground Reference	0V return for all analog/digital functions; decoupling capacitor (0.1µF) required at VOUT–GND.
5 BATT ON	Battery-On Status Output	Open-drain logic-high indicator of VBATT activation; sinks 3.2mA at 0.1V during VCC operation.
6 LOW LINE	Reset Threshold Monitor	Buffered comparator output; goes low when VCC < 4.4V, used for system-level power-fail signaling.
7 OSC IN	External Oscillator Input	Configurable timing node: accepts external clock or timing capacitor (e.g., 47pF) to set watchdog/reset periods.
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	Noninverting comparator input; triggers PFO low when voltage < 1.25V (±2% accuracy), usable for low-battery sensing.
10 PFO	Power-Fail Output	Open-drain comparator output; sinks 3.2mA at 0.1V, independent of other IC functions.
11 WDI	Watchdog Input	Three-level input (high/low/floating); resets watchdog timer on 100ns+ transitions; floating disables watchdog.
12 CE OUT	Chip-Enable Output	Gated CE signal; disabled during reset to prevent spurious memory writes; 75Ω series impedance in enabled state.
13 CE IN	Chip-Enable Input	High-impedance input during reset; passes CE signals transparently otherwise; leakage ≤±1μA over temperature.
14 WDO	Watchdog Output	Active-low watchdog fault indicator; goes low if WDI stalls >1.6s, asserting RESET for 200ms.
15 RESET	Active-Low Reset Output	Open-drain output asserted low during VCC undervoltage; valid down to VCC = 1V; requires external pull-up.
16 RESET	Active-High Reset Output	Open-drain inverse of RESET; high-impedance when deasserted; used for μPs requiring active-high reset.

Key Features

Feature	Design Value
Guaranteed RESET assertion to VCC = 1V	Ensures deterministic μP reset even during deep brownout, eliminating undefined startup states in industrial power environments.
MaxCap®/SuperCap-compatible battery switchover	Supports direct connection to large-capacitance backup sources (e.g., 0.47F) without external diode or FET, reducing BOM count.
On-board CE signal gating with 6ns propagation delay	Prevents corrupted memory writes during power transients by disabling CE path within 15μs of reset assertion.
Separate watchdog and reset timeout configuration	Independent selection of 100ms/1.6s watchdog periods and 200ms reset timeout via OSC SEL/OSC IN pins.
Uncommitted PFI/PFO comparator with ±2% accuracy	Enables flexible system-level monitoring (e.g., low-battery warning, pre-fail alert) without affecting core supervisory functions.
1μA standby current in battery-backup mode	Extends backup runtime for SRAM retention in battery-powered instruments, validated at TA = −40°C to +85°C.

Applications

Industrial Controller Power Monitoring	Embedded Instrument Battery Backup
Use Scenario: PLC or motion controller operating in factory environments with unstable 5V rails subject to voltage sags and surges. IC Role / Device Role / Timing Role: Supervisory circuit providing brownout detection, 200ms reset hold-off, and write-protection gating for program memory during power interruption. Use Value: Prevents firmware corruption by blocking CE signals during undervoltage and ensuring μP restarts only after stable VCC is restored.	Use Scenario: Portable multimeter or data logger retaining calibration data and real-time clock in sleep mode using supercapacitor backup. IC Role / Device Role / Timing Role: Dual-role supervisor: manages VCC→VBATT switchover at 4.4V threshold and supplies regulated VOUT to SRAM during main power loss. Use Value: Enables >10-year data retention with 0.47F MaxCap and <1μA backup current, eliminating coin-cell replacement.
Intelligent Power Supply Sequencing	Critical μP Boot Integrity Assurance
Use Scenario: Telecom base station power module requiring coordinated startup of DSP, FPGA, and interface ICs. IC Role / Device Role / Timing Role: Central reset coordinator generating synchronized RESET/RESET pulses and monitoring PFI for early AC-DC converter fault detection. Use Value: Eliminates race conditions during multi-rail power-up by enforcing strict 200ms reset timeout before releasing μP from reset.	Use Scenario: Medical diagnostic device where firmware execution errors during boot could compromise patient safety. IC Role / Device Role / Timing Role: Fail-safe boot monitor asserting RESET until VCC stabilizes above 4.4V and validating watchdog activity within first 1.6s of operation. Use Value: Guarantees μP executes only verified code sequences by combining voltage monitoring, reset timing, and watchdog supervision.

Industrial Controller Power Monitoring

Embedded Instrument Battery Backup

Use Scenario: PLC or motion controller operating in factory environments with unstable 5V rails subject to voltage sags and surges.

IC Role / Device Role / Timing Role: Supervisory circuit providing brownout detection, 200ms reset hold-off, and write-protection gating for program memory during power interruption.

Use Value: Prevents firmware corruption by blocking CE signals during undervoltage and ensuring μP restarts only after stable VCC is restored.

Use Scenario: Portable multimeter or data logger retaining calibration data and real-time clock in sleep mode using supercapacitor backup.

IC Role / Device Role / Timing Role: Dual-role supervisor: manages VCC→VBATT switchover at 4.4V threshold and supplies regulated VOUT to SRAM during main power loss.

Use Value: Enables >10-year data retention with 0.47F MaxCap and <1μA backup current, eliminating coin-cell replacement.

Intelligent Power Supply Sequencing

Critical μP Boot Integrity Assurance

Use Scenario: Telecom base station power module requiring coordinated startup of DSP, FPGA, and interface ICs.

IC Role / Device Role / Timing Role: Central reset coordinator generating synchronized RESET/RESET pulses and monitoring PFI for early AC-DC converter fault detection.

Use Value: Eliminates race conditions during multi-rail power-up by enforcing strict 200ms reset timeout before releasing μP from reset.

Use Scenario: Medical diagnostic device where firmware execution errors during boot could compromise patient safety.

IC Role / Device Role / Timing Role: Fail-safe boot monitor asserting RESET until VCC stabilizes above 4.4V and validating watchdog activity within first 1.6s of operation.

Use Value: Guarantees μP executes only verified code sequences by combining voltage monitoring, reset timing, and watchdog supervision.

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX693AEUE+	Extended temperature range (−40°C to +85°C) vs. MAX693ACUE+ (0°C to +70°C); identical electrical specs and pinout.	Suitable for automotive under-hood or outdoor industrial deployments requiring wider thermal margin.	Select MAX693AEUE+ when operating ambient exceeds +70°C or requires AEC-Q200 alignment.
MAX800MCSE+	Same 4.4V reset threshold and TSSOP-16 package, but guarantees ±2% power-fail accuracy (vs. unspecified for MAX693ACUE+); 16-pin narrow SO package.	Preferred for systems requiring traceable, production-tested PFI comparator accuracy for regulatory compliance reporting.	Choose MAX800MCSE+ when PFI-based low-battery warning must meet ±2% tolerance across full temperature range.

Compared with MAX693ACUE+, MAX693AEUE+ offers extended thermal reliability without layout changes, while MAX800MCSE+ adds certified PFI accuracy in a different package - both serve distinct environmental or compliance-driven design requirements without functional compromise.

Availability

MAX693ACUE+ is available at Aetrix Electronics and suitable for industrial controllers, embedded instrumentation, intelligent power supplies, and critical μP boot integrity assurance requiring stable component supply and long-term lifecycle support.

Supply support for MAX693ACUE+ 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 and mixed-signal ICs for power, sensing, and connectivity applications, with emphasis on reliability and integration for industrial and embedded systems.

The MAX691A/MAX693A family targets μP supervisory needs in space-constrained, power-sensitive applications - delivering integrated reset, watchdog, battery switchover, and CE gating in a single 16-pin TSSOP package.

FAQ

What is the reset threshold voltage of the MAX693ACUE+ and how is it specified?

The MAX693ACUE+ has a typical reset threshold voltage of 4.40V, with a minimum of 4.25V and maximum of 4.50V across temperature and process variation. This value is measured during VCC falling edge and is guaranteed with 15mV hysteresis to prevent oscillation near the trip point. The threshold is factory-trimmed and documented in the Electrical Characteristics table of the official Maxim datasheet Rev 14.

Does the MAX693ACUE+ support battery backup for SRAM, and what are the key electrical limits?

Yes, the MAX693ACUE+ supports battery backup via the VBATT pin, enabling seamless switchover to backup sources when VCC drops below VBATT − 0.3V. Key limits include: VBATT-to-VOUT on-resistance ≤30Ω at 2.0V, 25mA continuous battery current, and 250mA peak current. In battery-backup mode, supply current drops to ≤1μA, and RESET remains valid down to VCC = 1V.

How does the watchdog function operate on the MAX693ACUE+, and can it be disabled?

The MAX693ACUE+ watchdog monitors the WDI pin for transitions; if no change occurs for >1.6s (long period), it asserts WDO low and triggers RESET for 200ms. The watchdog is disabled by leaving WDI floating - its internal 100kΩ divider biases it to ~1.6V, which the internal comparators recognize as inactive. WDI must receive ≥100ns pulses to reset the timer.

What is the purpose of the CE IN and CE OUT pins on the MAX693ACUE+, and how do they behave during reset?

The CE IN and CE OUT pins implement hardware-enforced chip-enable gating: during normal operation, CE IN passes directly to CE OUT with ≤10ns delay; during reset assertion, CE OUT is disabled within 15μs to block spurious memory writes. CE IN enters high-impedance state during reset, and CE OUT is actively pulled to VOUT in disabled mode - preventing erroneous access to CMOS RAM during power faults.

Can the MAX693ACUE+ be used with a 3.3V microprocessor system?

No, the MAX693ACUE+ is designed for 5V systems only, with VCC operating range specified as +4.5V to +5.5V and reset threshold fixed at 4.4V. It lacks 3.3V compatibility - applying 3.3V to VCC will not activate reset functionality or guarantee proper internal biasing. For 3.3V supervision, consider the MAX6326 or MAX6361 families instead.

MAX693ACUE+ 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:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

MAX693ACUE+ FAQ

1.How can I place an order for MAX693ACUE+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX693ACUE+ 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 MAX693ACUE+ reliable?

The price and inventory of MAX693ACUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693ACUE+ is usually 5 days.

3.What payment methods are accepted for MAX693ACUE+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693ACUE+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX693ACUE+?

MAX693ACUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX693ACUE+ 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 MAX693ACUE+?

For technical support, including MAX693ACUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693ACUE+ requirements.

6.How does Aetrix verify that MAX693ACUE+ is sourced from the original manufacturer or authorized distributors?

All MAX693ACUE+ 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 MAX693ACUE+ meets industry standards.

7.What is the process for return or replacement of MAX693ACUE+?

All MAX693ACUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX693ACUE+, 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 MAX693ACUE+ part is unused and in its original packaging.

Return procedure for MAX693ACUE+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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