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Analog Devices Inc./Maxim Integrated MAX693ACSE+
- Part No.:
- MAX693ACSE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX693ACSE+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:287
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Product details
Overview
MAX693ACSE+ from Maxim Integrated is a microprocessor supervisory circuit providing power-on reset, watchdog timer, battery switchover, and chip-enable gating for 5V systems. It features a 4.4V typical reset threshold, 200ms reset timeout, 30μA operating supply current, and guaranteed RESET assertion down to VCC = 1V - used in embedded controllers and intelligent instruments requiring reliable brownout protection.
For engineers reviewing the MAX693ACSE+ datasheet, MAX693ACSE+ pinout, MAX693ACSE+ application, or MAX693ACSE+ equivalent, key selection criteria include reset threshold accuracy (±150mV), battery-backup mode behavior (VBATT ≥ 2.0V, VCC < VBATT − 1.2V), CE propagation delay (6–10ns), and compatibility with MaxCap®/supercapacitor backup schemes.
Technical Context
The MAX693ACSE+ integrates a precision voltage monitor with 4.4V reset threshold (typ), internal oscillator (100kHz nominal), and dual-mode watchdog (100ms short / 1.6s long timeout). Its battery switchover logic activates when VCC falls below VBATT − 1.2V and the reset threshold, routing VOUT to VBATT while asserting BATT ON high.
Chip-enable gating uses a 75Ω series transmission gate between CE IN and CE OUT, with 6–10ns propagation delay (50Ω source, 50pF load) and active pull-up to VOUT during reset. The uncommitted PFI/PFO comparator operates independently with 1.25V threshold and ±25nA input leakage.
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 to prevent chatter during brownout recovery. |
| Reset Timeout Period | 200ms typical (power-up); guarantees stable system initialization before releasing μP from reset state. |
| Supply Current (Operating) | 30μA typical; enables low-power operation in always-on monitoring applications without compromising supervision integrity. |
| VCC-to-VOUT On-Resistance | 0.8–1.2Ω (MAX69_AC); maintains ≤200mV drop at 250mA load, supporting CMOS RAM/EEPROM write-protection under full system current. |
| Battery Switchover Threshold | VCC < VBATT − 0.3V (power-down); cleanly transitions VOUT from VCC to VBATT with 60mV hysteresis to avoid oscillation near switchover point. |
| CE Propagation Delay | 6–10ns (50Ω source, 50pF load); preserves timing margins for fast μPs like 80C51 derivatives and avoids CE-related memory corruption. |
| PFI Input Threshold | 1.25V typical; provides accurate early power-fail warning or low-battery detection when referenced to stable VOUT. |
Pinout & Package
MAX693ACSE+ is housed in a 16-pin narrow SOIC package (body width 3.9mm, JEDEC MS-012AA), RoHS-compliant and lead-free (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Battery-Backup Input | Accepts 2.0–5.5V backup source; enables seamless VOUT switchover when VCC fails below VBATT − 1.2V. |
| 2 VOUT | Output Supply Voltage | Switched output sourced from VCC or VBATT; powers external RAM/EEPROM and drives open-drain outputs (RESET, WDO, PFO). |
| 3 VCC | Main Supply Input | 5V regulated input (4.5–5.5V range); powers internal circuitry and supplies VOUT via low-RDS(ON) PMOS switch (≤1.2Ω). |
| 4 GND | Ground Reference | 0V reference for all analog comparators, digital logic, and output drivers; requires low-impedance connection to system ground plane. |
| 5 BATT ON | Battery-On Indicator | Open-drain output pulled high in battery mode; signals switchover status and can drive PNP base for >250mA external backup supplies. |
| 6 LOW LINE | Reset Comparator Output | Buffered, active-low signal mirroring reset comparator state; sinks 3.2mA at 0.1V for direct LED or logic-level interfacing. |
| 7 OSC IN | Oscillator Timing Input | Accepts external capacitor (for programmable timeout) or clock signal; internal ±100nA current source sets oscillator frequency when OSC SEL = GND. |
| 8 OSC SEL | Oscillator Mode Select | Logic input selecting internal oscillator (floating/high) or external timing (low); internal 10μA pull-up enables default 1.6s/200ms timeout if left unconnected. |
| 9 PFI | Power-Fail Input | Non-inverting comparator input; triggers PFO low when voltage drops below 1.25V - used for low-battery or pre-fail warning. |
| 10 PFO | Power-Fail Output | Open-drain output tied to PFI comparator; sinks 3.2mA at 0.1V and remains active in battery-backup mode if VCC ≥ VBATT − 1.2V. |
| 11 WDI | Watchdog Input | Three-level input (high/mid/low); resets watchdog timer on any transition ≥100ns; floating (1.6V bias) disables watchdog function. |
| 12 CE OUT | Chip-Enable Output | Gated CE signal passed only when VCC > reset threshold; actively pulled to VOUT during reset to prevent spurious memory writes. |
| 13 CE IN | Chip-Enable Input | High-impedance input during reset; presents 75Ω series resistance in enabled mode to match μP CE drive strength. |
| 14 WDO | Watchdog Output | Open-drain watchdog fault indicator; goes low on WDI timeout and remains low until next WDI transition - independent of RESET timing. |
| 15 RESET | Active-Low Reset Output | Open-drain output asserted low during power-up, brownout, or watchdog fault; valid down to VCC = 1V; requires external pull-up. |
| 16 RESET | Active-High Reset Output | Open-drain inverse of RESET; high-impedance when inactive; used for μPs requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior even during deep brownout, eliminating need for external reset ICs in low-voltage failure scenarios. |
| On-board CE signal gating with 10ns max delay | Prevents corrupted writes to CMOS RAM/EEPROM during power failure without adding external logic or timing-critical PCB traces. |
| MaxCap®/supercapacitor-compatible backup | Supports low-ESR, high-capacitance backup sources (e.g., 0.47F) via low-RON VBATT switch (≤15Ω), enabling extended hold-up time without diode drop. |
| Dual-mode watchdog timer (100ms / 1.6s) | Allows fast recovery after reset (short period) and robust long-term supervision (long period), configurable via OSC SEL/OSC IN pins. |
| Independent power-fail comparator (PFI/PFO) | Provides dedicated early-warning capability for system-level power management without affecting reset or watchdog timing behavior. |
| Backup-battery switchover with hysteresis | Transitions VOUT from VCC to VBATT cleanly at VCC = VBATT − 0.3V (power-down) and VCC = VBATT + 0.3V (power-up), preventing oscillation. |
Applications
| Industrial Controller Supervision | Intelligent Instrument Power Management |
|---|---|
Use Scenario: PLC or motion controller maintaining real-time state during AC line sags or battery-backed UPS transitions. IC Role / Device Role / Timing Role: Supervisory IC providing 200ms reset hold-off, battery switchover signaling (BATT ON), and CE gating to protect configuration EEPROM. Use Value: Prevents firmware corruption during 10–100ms brownouts and extends operational uptime using supercapacitor backup (0.47F @ 2.8V). |
Use Scenario: Portable multimeter or data logger switching from main supply to coin-cell backup upon AC loss. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RESET and driving BATT ON to enable external PNP pass transistor for >250mA backup load. Use Value: Guarantees VOUT continuity down to VBATT = 2.0V and supports 25mA continuous battery current with <1μA standby drain. |
| Critical μP Power Monitoring | Computing System Health Management |
Use Scenario: Medical infusion pump requiring fail-safe reset and watchdog supervision per IEC 62304 Class C software requirements. IC Role / Device Role / Timing Role: Independent watchdog (WDO) and reset generator (RESET/RESET) with 1.6s timeout, validated to operate from VCC = 1V. Use Value: Meets safety-critical timing constraints with no reliance on μP firmware; watchdog disable via floating WDI simplifies qualification. |
Use Scenario: Embedded x86 SBC detecting imminent power loss and initiating graceful shutdown via PFI-triggered interrupt. IC Role / Device Role / Timing Role: Uncommitted PFI/PFO comparator generating early warning (1.25V threshold) 25μs before VCC crosses reset threshold. Use Value: Provides ≥5ms advance notice for nonvolatile save operations, exceeding typical μP interrupt latency requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACSE+ | 4.65V reset threshold (vs. 4.4V), same pinout and feature set; higher threshold suits 5V ±5% rails where tighter margin is acceptable. | Preferred in systems with stable 5V supplies where brownout sensitivity must be reduced to avoid false resets. | Select MAX691ACSE+ when reset threshold tolerance must exceed ±150mV or when legacy designs require identical timing behavior with higher trip point. |
| MAX800MCSE+ | Same 4.4V reset threshold and -40°C to +85°C temp grade; adds ±2% power-fail accuracy guarantee (vs. unspecified for MAX693A). | Required in industrial metering or telecom equipment where PFI comparator accuracy directly impacts revenue-grade energy measurement. | Choose MAX800MCSE+ when PFI/PFO comparator accuracy is critical and extended temperature operation is mandatory. |
Compared with MAX693ACSE+, MAX691ACSE+ raises reset threshold by 250mV for improved noise immunity on clean rails, while MAX800MCSE+ retains identical supervision timing but adds traceable ±2% PFI accuracy - making it suitable for metrology-critical applications where MAX693ACSE+ lacks specified comparator tolerance.
Availability
MAX693ACSE+ is available at Aetrix Electronics and suitable for industrial controllers, intelligent instrumentation, critical μP power monitoring, and computing system health management requiring stable component supply across extended product lifecycles.
Supply support for MAX693ACSE+ 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 industrial, automotive, and communications applications, with emphasis on reliability and integration.
The MAX691A/MAX693A family delivers integrated power supervision, watchdog, and memory protection for 5V microprocessor systems - targeting space-constrained, high-reliability embedded applications where discrete supervision solutions increase BOM cost and layout complexity.
FAQ
What is the guaranteed minimum operating voltage for RESET assertion in MAX693ACSE+?
The MAX693ACSE+ guarantees RESET output assertion remains valid down to VCC = 1V. Below this, gate drive weakens and saturation voltage rises, but with an external 10kΩ pulldown resistor, RESET stays functional down to GND. This behavior is confirmed in the Electrical Characteristics table and Detailed Description section of the MAX693ACSE+ datasheet.
How does the MAX693ACSE+ handle battery switchover, and what are the voltage thresholds?
The MAX693ACSE+ switches VOUT from VCC to VBATT when VCC falls below VBATT − 0.3V (power-down) and reverts when VCC rises above VBATT + 0.3V (power-up), with 60mV hysteresis. This behavior is explicitly defined in the Battery Switchover Threshold specification and Table 2 (Battery-Backup Mode) of the MAX693ACSE+ datasheet.
Can the watchdog timeout period of MAX693ACSE+ be adjusted, and how?
Yes - the MAX693ACSE+ supports four watchdog timeout configurations via OSC SEL and OSC IN: floating both (1.6s), OSC SEL high + OSC IN grounded (100ms), or OSC SEL grounded with external capacitor/clock (programmable). These options are detailed in Table 1 and Figure 3 of the MAX693ACSE+ datasheet, with timing governed by internal ±100nA current source.
Is MAX693ACSE+ compatible with supercapacitors, and what design considerations apply?
Yes - the MAX693ACSE+ is MaxCap®-compatible and supports supercapacitor backup via its low-RON VBATT switch (≤15Ω). Designers must limit continuous VBATT current to 25mA and use ≥0.1μF VOUT decoupling; the Typical Operating Circuit shows a 0.47F supercap with 1N4148 isolation diode, confirming direct applicability.
What is the function of the dual RESET/RESET outputs on MAX693ACSE+?
The MAX693ACSE+ provides both active-low (RESET) and active-high (RESET) open-drain reset outputs to interface with μPs requiring either polarity. RESET sinks current when asserted; RESET is high-impedance when inactive and pulled to VOUT when active - enabling direct connection to diverse reset architectures without level-shifting.
MAX693ACSE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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
MAX693ACSE+ FAQ
1.How can I place an order for MAX693ACSE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX693ACSE+ 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 MAX693ACSE+ reliable?
The price and inventory of MAX693ACSE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX693ACSE+ is usually 5 days.
3.What payment methods are accepted for MAX693ACSE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX693ACSE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX693ACSE+?
MAX693ACSE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX693ACSE+ 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 MAX693ACSE+?
For technical support, including MAX693ACSE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX693ACSE+ requirements.
6.How does Aetrix verify that MAX693ACSE+ is sourced from the original manufacturer or authorized distributors?
All MAX693ACSE+ 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 MAX693ACSE+ meets industry standards.
7.What is the process for return or replacement of MAX693ACSE+?
All MAX693ACSE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX693ACSE+, 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 MAX693ACSE+ part is unused and in its original packaging.
Return procedure for MAX693ACSE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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