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Analog Devices Inc./Maxim Integrated MAX793TCSE-T
- Part No.:
- MAX793TCSE-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793TCSE-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,327
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Product details
Overview
MAX793TCSE-T from Maxim Integrated is a 3.3V microprocessor supervisory circuit with fixed 3.00V–3.15V reset threshold, backup-battery switchover (VBATT > VCC supported), active-low open-drain RESET output, and integrated watchdog timer (1.6s timeout). It monitors critical power rails in battery-backed embedded controllers and provides chip-enable gating to protect CMOS RAM during undervoltage events.
For engineers reviewing the MAX793TCSE-T datasheet, MAX793TCSE-T pinout, MAX793TCSE-T application, or MAX793TCSE-T equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1V, battery-freshness seal capability, low-line early-warning output (LOWLINE), and CE IN-to-CE OUT propagation delay ≤7ns - all validated for industrial temperature range (0°C to +70°C) in 16-pin narrow SO package.
Technical Context
The MAX793TCSE-T implements a precision voltage comparator with 10mV typical hysteresis on its internal reset threshold (3.085V typical at +25°C, 3.00V–3.15V guaranteed over temperature), coupled with a dedicated VCC-to-VBATT switchover circuit that activates when VCC falls below VSW (2.55V–2.68V). Its watchdog logic continuously monitors WDI transitions and asserts WDO low after 1.6s of inactivity.
It integrates a 7ns max propagation-delay transmission gate between CE IN and CE OUT, enabling real-time chip-enable control during brownouts. The BATT OK output (MAX793 variant only) continuously monitors VBATT against 2.0V–2.5V threshold and asserts low if battery voltage drops below specification - independent of VCC status once reset is deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V–3.15V (VCC falling); ensures reliable reset before 3.3V system enters brownout zone |
| Battery Switch Threshold | 2.55V–2.68V (VCC falling); triggers seamless switchover to backup battery before VCC collapses |
| Watchdog Timeout | 1.6s ±25%; provides deterministic fault detection window for firmware liveliness checks |
| CE IN-to-CE OUT Delay | ≤7ns; preserves timing integrity for high-speed memory access during voltage transients |
| RESET Assertion Range | Guaranteed to VCC = 1V; maintains reset state through deep undervoltage conditions |
| BATT OK Threshold | 2.00V–2.50V (VBATT falling); enables early battery depletion warning without external sensing |
| Supply Current (VCC) | 46µA–60µA @ 3.3V; ultra-low quiescent draw extends battery life in always-on monitoring |
Pinout & Package
MAX793TCSE-T is housed in a 16-pin narrow SOIC (SO) package with 1.27mm pitch, JEDEC MS-012AC compliant, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | CMOS RAM supply output | Switches between VCC and BATT via internal p-MOSFET; supports load currents up to 75mA |
| 2 (VCC) | Main supply input | Accepts 3.17V–5.5V; powers internal circuitry and drives CE OUT pullup |
| 3 (RESET IN) | Reset threshold programming input | Not used on MAX793T; reserved for MAX794's adjustable reset configuration |
| 4 (PFI) | Power-fail comparator input | Monitors external rail; triggers PFO low when input <1.212V or VCC < VSW |
| 5 (BATT ON) | Backup power status indicator | Active-high signal indicating OUT is sourced from BATT (not VCC) |
| 6 (GND) | Ground reference | Common return path for VCC, BATT, and all digital outputs |
| 7 (PFO) | Power-fail comparator output | Open-drain; used for NMI generation or battery freshness seal enable |
| 8 (MR) | Manual reset input | Active-low with 70µA internal pullup; asserts reset for ≥200ms after release |
| 9 (WDO) | Watchdog output | Active-low; pulses low on WDI timeout; can be wired to MR for auto-reset |
| 10 (WDI) | Watchdog input | Edge-sensitive; detects ≥100ns pulses; resets 1.6s timer on any transition |
| 11 (CE IN) | Chip-enable input | Controls gating path; high-impedance during reset to prevent spurious writes |
| 12 (CE OUT) | Chip-enable output | Passes CE IN signal only when reset inactive; 46Ω series resistance in enabled mode |
| 13 (RESET) | Active-high reset output | Sinks/sourcing capable; complements open-drain RESET; drives µP directly |
| 14 (LOWLINE) | Early power-fail warning | Active-low; asserts 5–60mV below VRST to provide NMI before full reset |
| 15 (RESET) | Active-low reset output | Open-drain; requires external pullup; holds low for 200ms minimum post-threshold recovery |
| 16 (BATT) | Backup battery input | Accepts up to 6.0V; supports 3.6V lithium cells exceeding VCC; leakage <1µA |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | Fixed 3.00V–3.15V trip point with 10mV hysteresis prevents chatter during slow VCC ramps |
| Battery-freshness seal | Disables BATT connection until first power cycle, preserving shelf life of 3.6V lithium backup cells |
| Low-line early warning | LOWLINE output asserts 5–60mV below reset threshold, enabling NMI-based graceful shutdown |
| On-board CE gating | 7ns max propagation delay ensures compatibility with fast µPs while blocking invalid writes during brownout |
| Guaranteed reset to 1V | Ensures µP remains held in reset even during severe undervoltage, preventing code corruption |
Applications
| Battery-Powered Computers and Controllers | Embedded Controllers |
|---|---|
Use Scenario: Portable data logger with nonvolatile RAM retains settings during main power loss. IC Role / Device Role / Timing Role: MAX793TCSE-T supplies clean VCC/BATT switchover to RAM, asserts RESET to halt CPU, and triggers LOWLINE for preemptive save. Use Value: Prevents RAM corruption and enables deterministic state recovery using 3.6V coin cell without PCB-level diode ORing. | Use Scenario: Industrial PLC module with watchdog supervision of firmware execution. IC Role / Device Role / Timing Role: MAX793TCSE-T monitors 3.3V rail, feeds WDI with periodic GPIO toggles, and asserts WDO→MR on stall. Use Value: Guarantees 1.6s maximum fault detection latency and automatic hard reset without external logic. |
| Intelligent Controllers | Critical µP Power Monitoring |
Use Scenario: Smart HVAC controller with battery-backed real-time clock and configuration storage. IC Role / Device Role / Timing Role: MAX793TCSE-T gates CE signals to RTC/EEPROM during brownout and validates BATT OK before enabling timekeeping. Use Value: Eliminates need for discrete MOSFET switch and voltage detector, reducing BOM count by 3 components. | Use Scenario: Medical infusion pump requiring fail-safe power sequencing and reset assurance. IC Role / Device Role / Timing Role: MAX793TCSE-T provides dual-reset signaling (RESET and RESET), monitors VCC with 3.085V threshold, and asserts BATT OK only above 2.25V. Use Value: Meets IEC 62304 Class C requirements for deterministic reset behavior and battery health validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690TESA+ | 5V-only operation; no battery switchover; 4.65V reset threshold; no LOWLINE or BATT OK outputs | Designed for legacy 5V µP systems; lacks 3.3V compatibility and battery management features | Select MAX690TESA+ only for retrofitting 5V designs where backup battery is absent and reset threshold >4.6V is acceptable |
| TPS3808G33DBVR | 3.3V fixed reset; no watchdog; no battery switchover; no CE gating; 200ms reset timeout only | Basic voltage monitor for cost-sensitive applications; excludes advanced protection functions | Choose TPS3808G33DBVR when only reset assertion is required and battery backup, watchdog, or memory gating are unnecessary |
Compared with MAX690TESA+ and TPS3808G33DBVR, the MAX793TCSE-T uniquely combines 3.3V-compatible reset supervision, battery switchover, watchdog timer, and chip-enable gating in a single 16-pin SOIC - making it irreplaceable for safety-critical, battery-backed embedded systems requiring coordinated power, memory, and firmware monitoring.
Availability
MAX793TCSE-T is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, and intelligent controllers requiring stable component supply across industrial temperature ranges and long-term lifecycle support.
Supply support for MAX793TCSE-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 and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX793 family targets 3.0V/3.3V microprocessor supervisory needs - integrating reset, watchdog, battery switchover, and memory protection in one device for space-constrained, reliability-critical embedded systems.
FAQ
What is the exact reset threshold voltage range for MAX793TCSE-T?
The MAX793TCSE-T has a guaranteed reset threshold range of 3.00V to 3.15V for VCC falling, with a typical value of 3.085V at +25°C. This range is factory-trimmed and specified over the full operating temperature range (0°C to +70°C), ensuring reliable reset assertion before a 3.3V system enters an unstable operating region. The MAX793TCSE-T does not support adjustable reset thresholds - that functionality is exclusive to the MAX794 variant.
Does MAX793TCSE-T support backup battery voltages higher than VCC?
Yes, the MAX793TCSE-T explicitly supports backup battery voltages exceeding VCC - up to 6.0V - enabling direct use of standard 3.6V lithium batteries in 3.3V systems. Its internal p-channel MOSFET switch ensures seamless switchover from VCC to BATT when VCC falls below the battery switch threshold (2.55V–2.68V), with no external components required. This capability is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official MAX793 datasheet.
What is the function of the LOWLINE output on MAX793TCSE-T?
The LOWLINE output on MAX793TCSE-T is an active-low early power-fail warning signal that asserts when VCC falls to within 5–60mV below the reset threshold (VRST). It provides a programmable "heads-up" alert before full reset activation, allowing the microprocessor to execute last-chance operations such as saving volatile data or entering safe states. LOWLINE is distinct from RESET and operates independently - it remains functional even during manual reset assertion via MR.
Can MAX793TCSE-T be used without a backup battery?
Yes, MAX793TCSE-T operates fully without a backup battery. When BATT is left unconnected or tied to VCC, the device functions as a standard 3.3V supervisory circuit with reset, watchdog, LOWLINE, and CE gating. The BATT pin may be floated or connected to VCC per the datasheet recommendation. All core supervision features - including RESET assertion down to VCC = 1V, 1.6s watchdog timeout, and CE IN-to-CE OUT gating - remain fully operational regardless of BATT connection status.
What is the purpose of the BATT OK output on MAX793TCSE-T?
The BATT OK output on MAX793TCSE-T is an active-high status indicator that goes high only when the backup battery voltage (VBATT) exceeds 2.00V–2.50V and reset is not asserted. It continuously monitors VBATT in normal operation and goes low if battery voltage drops below specification or if VCC falls below the battery switch threshold (VSW). This enables system-level battery health validation without external circuitry - a feature unique to the MAX793 (not present in MAX794/MAX795 variants).
MAX793TCSE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.09V
- Output:
- Open Drain, 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
MAX793TCSE-T FAQ
1.How can I place an order for MAX793TCSE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793TCSE-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 MAX793TCSE-T reliable?
The price and inventory of MAX793TCSE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793TCSE-T is usually 5 days.
3.What payment methods are accepted for MAX793TCSE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793TCSE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793TCSE-T?
MAX793TCSE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793TCSE-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 MAX793TCSE-T?
For technical support, including MAX793TCSE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793TCSE-T requirements.
6.How does Aetrix verify that MAX793TCSE-T is sourced from the original manufacturer or authorized distributors?
All MAX793TCSE-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 MAX793TCSE-T meets industry standards.
7.What is the process for return or replacement of MAX793TCSE-T?
All MAX793TCSE-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX793TCSE-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 MAX793TCSE-T part is unused and in its original packaging.
Return procedure for MAX793TCSE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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