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Analog Devices Inc./Maxim Integrated MAX793TESE-T
- Part No.:
- MAX793TESE-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793TESE-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,192
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Product details
Overview
MAX793TESE-T from Maxim Integrated is a 3.3V microprocessor supervisory circuit with fixed reset threshold (3.00V–3.15V), backup-battery switchover, active-low reset output, and integrated watchdog timer (1.6s timeout). It monitors VCC supply integrity, asserts reset during brownout or manual trigger, and gates chip-enable signals to protect CMOS RAM in embedded controllers and portable equipment.
For engineers reviewing the MAX793TESE-T datasheet, MAX793TESE-T pinout, MAX793TESE-T application, or MAX793TESE-T equivalent, this page delivers verified specifications including reset threshold tolerance (±50mV), guaranteed reset assertion down to VCC = 1V, battery-switching hysteresis (15mV), CE-to-CE propagation delay (≤7ns), and BATT OK monitoring threshold (2.0V min).
Technical Context
The MAX793TESE-T implements a precision voltage comparator for reset generation with 10mV typical hysteresis to prevent oscillation during VCC transitions. Its internal p-channel MOSFET switch enables seamless switchover between VCC and VBATT (up to 3.6V), with VCC-to-OUT on-resistance <160Ω at +25°C and <200Ω over full temperature range.
It integrates a dedicated watchdog timer that clears on any WDI transition and times out after 1.6s if no activity occurs; WDO drives low to signal fault and can be connected to MR to auto-generate reset pulses. The CE gating path uses a transmission gate with 46Ω series resistance and 10µs hold time on power-down to complete write cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V to 3.15V (VCC falling); ensures reliable reset before 3.3V system drops below 3.0V nominal operating limit |
| Reset Timeout Period | 200ms minimum; guarantees µP remains held in reset long enough for stable power-up sequencing |
| Battery Switch Threshold | VSW = 2.55V (min); triggers switchover to backup battery before VCC falls below reset threshold |
| Watchdog Timeout | 1.6s ±25%; provides deterministic fault detection window for firmware liveliness monitoring |
| VCC Supply Current | 46µA (typ) at 3.3V; enables ultra-low-power operation in battery-backed systems |
| BATT Leakage Current | 1µA (max) with freshness seal enabled; preserves lithium battery shelf life for >10 years |
| CE IN-to-CE OUT Delay | ≤7ns (max); supports high-speed µP bus timing without violating setup/hold requirements |
Pinout & Package
MAX793TESE-T is housed in a 16-pin narrow SO package (SOIC-16, 3.9mm width), RoHS-compliant and lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switched output connected to VCC or BATT via internal p-MOSFET; supports up to 75mA load |
| 2 VCC | Main supply input | Primary 3.0V/3.3V power rail input; monitored for reset generation and CE gating control |
| 3 RESET IN | Reset threshold programming input (not used on MAX793) | No connection required; unused on MAX793T variant (fixed threshold) |
| 4 PFI | Power-fail comparator input | Monitors external voltage for early warning; pulls PFO low when VPFI < 1.212V |
| 5 BATT ON | Backup-battery status indicator | Active-high open-drain output signaling OUT is sourced from BATT (VBATT > VSW) |
| 6 GND | Ground reference | Common return path for all analog and digital functions; requires low-impedance PCB plane |
| 7 PFO | Power-fail comparator output | Open-drain output pulled low during power fail or used to enable battery freshness seal |
| 8 MR | Manual reset input | Active-low input with 70µA internal pullup; asserts reset for 200ms after rising edge |
| 9 WDO | Watchdog output | Open-drain output driven low on watchdog timeout; logic high when VCC > VSW and WDI active |
| 10 WDI | Watchdog input | Edge-sensitive input detecting ≥100ns pulses; resets internal 1.6s timer on each transition |
| 11 CE IN | Chip-enable input | Input to CE gating circuit; high-impedance during reset to isolate memory bus |
| 12 CE OUT | Chip-enable output | Gated CE signal passed only when reset inactive; includes 10µs hold time on power-down |
| 13 RESET | Active-high reset output | Push-pull output sourcing/sinking current; inverse of open-drain RESET pin |
| 14 LOWLINE | Early power-fail warning output | Active-low output asserting when VCC falls to VLR = VRST − 25mV (typ), enabling NMI generation |
| 15 RESET | Active-low reset output | Open-drain output requiring external pullup; asserted low for entire reset timeout period |
| 16 BATT | Backup-battery input | Accepts 3.6V lithium battery; voltage may exceed VCC; enables switchover without diode drop |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | Fixed 3.00V–3.15V trip point with ±50mV tolerance ensures compatibility with 3.3V ±5% systems |
| Guaranteed reset down to VCC = 1V | Enables robust reset assertion even during deep brownout conditions where other supervisors fail |
| Backup-battery switchover | VBATT may exceed VCC (e.g., 3.6V Li battery in 3.3V system); eliminates need for external diode or regulator |
| On-board CE gating | 7ns max propagation delay prevents spurious writes to CMOS RAM during undervoltage events |
| Battery freshness seal | Reduces BATT leakage to ≤1µA until first power-up, preserving battery capacity for >10-year shelf life |
| Integrated watchdog timer | 1.6s timeout with automatic clear on WDI transition; cannot be disabled-ensures always-on safety monitoring |
Applications
| Industrial Embedded Controller | Portable Medical Device |
|---|---|
|
Use Scenario: Programmable logic controller (PLC) module operating from 3.3V main supply with coin-cell backup. IC Role / Device Role / Timing Role: Supervises VCC, asserts reset on brownout, switches RAM supply to battery, and gates CE to prevent data corruption during power loss. Use Value: Ensures deterministic boot state and nonvolatile RAM retention during mains interruption without external FET or diode. |
Use Scenario: Handheld glucose meter with 3.3V MCU and CR2032 backup battery. IC Role / Device Role / Timing Role: Monitors supply voltage, triggers early warning (LOWLINE) at 3.075V, asserts reset at 3.00V, and enables battery freshness seal until first use. Use Value: Extends battery shelf life by >10 years while guaranteeing first-power reliability and eliminating need for factory battery replacement. |
| Intelligent Power Meter | Battery-Powered Data Logger |
|
Use Scenario: Smart electricity meter with real-time clock and flash memory, powered from AC-derived 3.3V rail. IC Role / Device Role / Timing Role: Provides power-fail detection (PFI/PFO), generates NMI via LOWLINE for graceful shutdown, and maintains RTC supply via BATT switchover. Use Value: Enables accurate energy logging across grid interruptions using single-chip solution with no external comparators or timers. |
Use Scenario: Environmental sensor node logging temperature/humidity every 5 minutes using 3.3V MCU and lithium-thionyl chloride battery. IC Role / Device Role / Timing Role: Watches firmware execution via WDI, asserts reset on hang, gates CE during brownout, and monitors BATT health via BATT OK output. Use Value: Delivers autonomous field operation for >5 years with built-in watchdog recovery and battery voltage validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SESE-T | Reset threshold range 2.85V–3.00V (S-suffix); tighter hysteresis (10mV vs. 15mV) and lower VCC min (3.02V) | Better suited for 3.3V ±10% supplies where earlier reset assertion is required | Select MAX793SESE-T when system VCC tolerance exceeds ±5% and brownout margin must be extended |
| MAX795TESE+T | 8-pin SO package (vs. 16-pin); omits LOWLINE, BATT OK, CE gating, and watchdog; same T-suffix reset threshold | Targeted at space-constrained designs needing only basic reset + battery switchover | Choose MAX795TESE+T when board area is critical and advanced features like watchdog or CE gating are unnecessary |
Compared with MAX793SESE-T, the MAX793TESE-T offers higher reset threshold for tighter 3.3V ±5% systems; compared with MAX795TESE+T, it retains full feature set-including watchdog, CE gating, and dual reset outputs-at the cost of larger footprint and higher pin count.
Availability
MAX793TESE-T is available at Aetrix Electronics and suitable for industrial embedded controllers, portable medical devices, and intelligent power meters requiring stable component supply with long-term lifecycle support.
Supply support for MAX793TESE-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, automotive, and communications markets.
The MAX793 family was designed specifically for 3.0V/3.3V microprocessor supervision in battery-critical applications-emphasizing ultra-low quiescent current, precise reset thresholds, and integrated battery management features.
FAQ
What is the exact reset threshold voltage range for MAX793TESE-T?
The MAX793TESE-T has a fixed reset threshold range of 3.00V to 3.15V (VCC falling), optimized for 3.3V ±5% power supplies. This ensures reset is guaranteed not to assert above 3.15V and will assert before VCC falls below 3.00V, providing a 150mV noise margin. The threshold is factory-trimmed and does not require external resistors.
Does MAX793TESE-T support backup batteries with voltage higher than VCC?
Yes, MAX793TESE-T explicitly supports VBATT exceeding VCC - for example, a 3.6V lithium battery in a 3.3V system. Its internal p-channel MOSFET switch enables seamless switchover without diode voltage drop, and the battery switch threshold (VSW) is 2.55V (min), ensuring reliable handoff before reset assertion.
How does the watchdog function operate in MAX793TESE-T?
The MAX793TESE-T includes a non-disableable watchdog timer with 1.6s timeout. It clears on any WDI transition (low-to-high or high-to-low) and asserts WDO low if no activity occurs within that window. WDO can be connected to MR to generate automatic reset pulses, and the timer remains cleared while reset is active.
What is the purpose of the BATT OK output on MAX793TESE-T?
The BATT OK output on MAX793TESE-T is a status indicator for the backup battery: it goes high when VBATT exceeds 2.0V (min) and VCC is above VSW, and low otherwise. This allows system firmware to validate battery health before relying on backup power, and it is disabled (logic low) when VCC falls below the battery switch threshold.
Can MAX793TESE-T be used without a backup battery?
Yes, MAX793TESE-T operates fully without a backup battery. Connect BATT to VCC and leave OUT unconnected or tied to VCC. All supervision functions - reset generation, LOWLINE warning, PFI monitoring, and CE gating - remain active. Battery-related features (BATT OK, BATT ON, switchover) are simply inactive, with no impact on core functionality.
MAX793TESE-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:
- 3.075V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX793TESE-T FAQ
1.How can I place an order for MAX793TESE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793TESE-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 MAX793TESE-T reliable?
The price and inventory of MAX793TESE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793TESE-T is usually 5 days.
3.What payment methods are accepted for MAX793TESE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793TESE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793TESE-T?
MAX793TESE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793TESE-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 MAX793TESE-T?
For technical support, including MAX793TESE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793TESE-T requirements.
6.How does Aetrix verify that MAX793TESE-T is sourced from the original manufacturer or authorized distributors?
All MAX793TESE-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 MAX793TESE-T meets industry standards.
7.What is the process for return or replacement of MAX793TESE-T?
All MAX793TESE-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX793TESE-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 MAX793TESE-T part is unused and in its original packaging.
Return procedure for MAX793TESE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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