My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX693ACWE+
- Part No.:
- MAX693ACWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX693ACWE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,523
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX693ACWE+ from Maxim Integrated is a microprocessor supervisory circuit designed for 5V systems requiring reliable power monitoring, battery switchover, and watchdog protection. 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 robust operation in critical embedded controllers and intelligent instruments.
For engineers reviewing the MAX693ACWE+ datasheet, MAX693ACWE+ pinout, MAX693ACWE+ application, or MAX693ACWE+ equivalent, key selection considerations include its dual RESET/RESET outputs, CE signal gating capability, battery-backup mode with VBATT-to-VOUT on-resistance ≤30Ω, and ±2% power-fail accuracy (shared with MAX800M variant).
Technical Context
The MAX693ACWE+ integrates a precision voltage monitor, internal oscillator-based reset/watchdog timer, chip-enable transmission gate, and independent power-fail comparator. Its reset logic asserts both active-low RESET and active-high RESET outputs when VCC falls below 4.4V (typ), holding them active for 200ms after VCC rises above threshold during power-up.
It implements battery switchover via internal PMOS switches between VCC and VBATT, with BATT ON output signaling switchover status and CE IN/CE OUT providing 10ns max propagation delay gating of memory access signals - all while maintaining <1μA standby current in battery-backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.4V typical - ensures reliable μP reset before brownout in +5V systems |
| Reset Timeout Period | 200ms typical - provides sufficient time for power stabilization before release |
| Supply Current (Operating) | 30μA typical - enables low-power operation without compromising supervision integrity |
| VCC-to-VOUT On-Resistance | 0.8–1.2Ω - minimizes voltage drop under 250mA load, preserving system rail stability |
| VBATT-to-VOUT On-Resistance | ≤30Ω at 2.0V - supports stable backup power delivery up to 25mA continuous |
| Power-Fail Accuracy | ±2% - enables precise early warning for low-battery or AC loss detection |
| CE Propagation Delay | 6–10ns - compatible with high-speed μP bus timing, preventing spurious writes |
Pinout & Package
MAX693ACWE+ is housed in a 16-pin Wide SO (SOIC-W) package, 7.5mm × 10.3mm body, 1.27mm pitch, RoHS-compliant lead-free finish (denoted by '+' suffix). Thermal performance supports 762mW continuous dissipation at +70°C ambient.
| 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 reset threshold |
| 2 VOUT | Output Supply Voltage | Switched output sourced from VCC or VBATT; powers external circuitry and serves as reference for internal logic |
| 3 VCC | Main Supply Input | +4.5V to +5.5V regulated input; monitored for reset generation and CE gating enable |
| 4 GND | Ground Reference | 0V return for all analog/digital functions; must be low-impedance for accurate threshold sensing |
| 5 BATT ON | Battery-On Indicator | Open-drain output pulled high in battery mode; drives PNP base for >250mA external pass transistor |
| 6 LOW LINE | Reset Comparator Output | Buffered, non-inverting output of reset threshold comparator - used for system status indication |
| 7 OSC IN | Oscillator Timing Input | Accepts external capacitor or clock; sets watchdog/reset timeout periods (100ms/1.6s default) |
| 8 OSC SEL | Oscillator Mode Select | Configures internal vs. external timing source; internal pull-up enables default oscillator when floating |
| 9 PFI | Power-Fail Input | Non-inverting comparator input; triggers PFO when voltage falls below 1.25V ±2% |
| 10 PFO | Power-Fail Output | Open-drain output indicating power failure or low-battery condition; sinks 3.2mA at 0.1V |
| 11 WDI | Watchdog Input | Three-level input (high/low/floating); resets watchdog timer on transition; floating disables function |
| 12 CE OUT | Chip-Enable Output | Gated CE signal passed only when VCC > reset threshold; prevents RAM corruption during brownout |
| 13 CE IN | Chip-Enable Input | High-impedance when reset asserted; series 75Ω resistance in enabled mode |
| 14 WDO | Watchdog Output | Asserts low on watchdog timeout; remains low until next WDI transition; TTL-compatible drive |
| 15 RESET | Active-Low Reset Output | Open-drain output; valid down to VCC = 1V; requires external pull-up for μP reset input |
| 16 RESET | Active-High Reset Output | Open-drain inverse of RESET; high-impedance when inactive; referenced to VOUT |
Key Features
| Feature | Design Value |
|---|---|
| Dual RESET Outputs | Simultaneous active-low and active-high open-drain outputs ensure compatibility with μPs requiring either polarity reset input |
| Guaranteed Reset Below 1V | RESET remains functional even as VCC collapses to 1V - critical for fail-safe shutdown in unregulated supplies |
| Chip-Enable Gating | Hardware-enforced CE blocking during reset prevents erroneous writes to CMOS RAM/EEPROM during power transitions |
| MaxCap®/SuperCap Compatible | Supports large backup capacitors (e.g., 0.47F) with controlled switchover - eliminates need for rechargeable batteries |
| Independent Power-Fail Comparator | Uncommitted PFI/PFO pair enables flexible low-battery or AC-loss detection without affecting core supervision logic |
Applications
| Industrial Controller Monitoring | Embedded Data Logger |
|---|---|
|
Use Scenario: PLC or motion controller powered from industrial 5V rail subject to line sags and transient interruptions. IC Role / Device Role / Timing Role: Supervisory IC monitors VCC, asserts RESET to halt CPU execution during brownout, gates CE to protect configuration EEPROM, and signals battery switchover via BATT ON. Use Value: Prevents firmware corruption and maintains real-time clock/data integrity during 200ms+ power interruptions using onboard capacitor backup. |
Use Scenario: Battery-powered environmental sensor node logging temperature/humidity to SPI flash memory. IC Role / Device Role / Timing Role: Provides watchdog supervision of MCU sleep/wake cycles, detects main supply loss via PFI, switches to VBATT, and asserts RESET if firmware hangs during write operations. Use Value: Enables reliable long-term data capture with automatic fallback to supercapacitor backup and power-fail logging before shutdown. |
| Medical Diagnostic Instrument | Point-of-Sale Terminal |
|
Use Scenario: Portable ultrasound or ECG device requiring FDA-compliant power sequencing and fault recovery. IC Role / Device Role / Timing Role: Generates synchronized reset pulse on power-up, monitors VCC for compliance with IEC 60601-1 voltage tolerance, and isolates memory interface during power transitions via CE gating. Use Value: Ensures deterministic boot state and prevents corrupted calibration data storage - meeting Class II medical device reliability requirements. |
Use Scenario: Retail terminal with flash memory storing transaction logs and firmware, exposed to unstable wall-adapter inputs. IC Role / Device Role / Timing Role: Detects AC adapter dropout, initiates graceful shutdown sequence via WDI-triggered watchdog timeout, and maintains RTC power via VBATT switchover. Use Value: Eliminates transaction loss during unexpected power loss and guarantees secure firmware update rollback capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX800MCSE+ | Same 4.4V reset threshold and ±2% power-fail accuracy; identical pinout and electrical specs; rated for -40°C to +85°C industrial temp range | Preferred for extended temperature deployments (e.g., outdoor kiosks, factory-floor controllers) | Select MAX800MCSE+ when operating ambient exceeds +70°C or wider temp qualification is required |
| TPS3808G33DBVR | 3.3V fixed reset threshold; no battery switchover, CE gating, or watchdog; lower quiescent current (1.8μA) | Suitable only for basic 3.3V reset supervision - lacks MAX693ACWE+'s backup, memory protection, and fault-detection features | Choose TPS3808G33DBVR only for cost-sensitive, single-rail 3.3V systems without backup or watchdog needs |
Compared with MAX800MCSE+, the MAX693ACWE+ offers identical supervision functionality but is qualified only for 0°C to +70°C; versus TPS3808G33DBVR, it delivers comprehensive 5V system protection including battery switchover, CE gating, and dual watchdog modes - at higher supply current and package cost.
Availability
MAX693ACWE+ is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic instruments, and point-of-sale terminals requiring stable component supply with full traceability and lifecycle management.
Supply support for MAX693ACWE+ 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 to replace legacy supervisory circuits with enhanced accuracy, lower power, and integrated memory protection - targeting mission-critical 5V μP systems where data integrity and fail-safe behavior are non-negotiable.
FAQ
What is the operating voltage range for MAX693ACWE+?
The MAX693ACWE+ operates with VCC from +4.5V to +5.5V and VBATT from +2.0V to +5.5V. Its reset threshold is 4.4V typical, and RESET remains valid down to VCC = 1V. The device guarantees proper function across this range at temperatures from 0°C to +70°C, with absolute maximum ratings extending to -0.3V to +6V on VCC and VBATT pins.
How does the watchdog function work in MAX693ACWE+?
The MAX693ACWE+ watchdog monitors the WDI pin: if WDI remains static (high or low) longer than the timeout period (1.6s nominal), WDO goes low and RESET/RESET are asserted for 200ms. A transition on WDI resets the timer. Leaving WDI unconnected disables the watchdog via internal 1.6V biasing - a confirmed behavior documented in the datasheet's "Watchdog Input" section.
Can MAX693ACWE+ support supercapacitor backup?
Yes, MAX693ACWE+ is explicitly MaxCap® and SuperCap compatible. Its VBATT input handles up to 25mA continuous current and supports direct connection to large-value backup capacitors (e.g., 0.47F), with switchover hysteresis of 60mV and guaranteed operation down to VBATT = 2.0V - enabling maintenance of RTC and SRAM during extended AC outages.
What is the purpose of CE IN and CE OUT in MAX693ACWE+?
In MAX693ACWE+, CE IN and CE OUT implement hardware-enforced chip-enable gating: CE OUT passes CE IN signals only when VCC is above the 4.4V reset threshold. During brownout or reset, CE OUT is disabled, preventing spurious writes to CMOS RAM or EEPROM - a critical feature verified in the "Chip-Enable Signal Gating" section of the datasheet with 10ns max propagation delay.
Does MAX693ACWE+ provide power-fail detection?
Yes, MAX693ACWE+ includes a dedicated uncommitted power-fail comparator with PFI and PFO pins. PFI has a 1.25V threshold (±2% accuracy), and PFO asserts low when PFI falls below that level. This function operates independently of reset logic and remains active in battery-backup mode for VCC ≥ VBATT − 1.2V - enabling reliable low-battery or AC-loss warnings.
MAX693ACWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX693ACWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693ACWE+ 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+ reliable?
The price and inventory of MAX693ACWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693ACWE+ is usually 5 days.
3.What payment methods are accepted for MAX693ACWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693ACWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693ACWE+?
MAX693ACWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693ACWE+ 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+?
For technical support, including MAX693ACWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693ACWE+ requirements.
6.How does Aetrix verify that MAX693ACWE+ is sourced from the original manufacturer or authorized distributors?
All MAX693ACWE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX693ACWE+?
All MAX693ACWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX693ACWE+, 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+ part is unused and in its original packaging.
Return procedure for MAX693ACWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX693ACWE+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
