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Analog Devices Inc./Maxim Integrated MAX793TEPE+
- Part No.:
- MAX793TEPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX793TEPE+.pdf
- Description:
- IC SUPERVISOR MPU 16-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,628
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Product details
Overview
MAX793TEPE+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with fixed reset threshold (3.00V–3.15V), backup-battery switchover, active-low/open-drain RESET output, and integrated watchdog timer (1.6s timeout). It monitors VCC in battery-backed embedded controllers, asserts reset below threshold, gates CE signals with ≤7ns propagation delay, and supports lithium battery voltages up to 3.6V exceeding VCC.
For engineers reviewing the MAX793TEPE+ datasheet, MAX793TEPE+ pinout, MAX793TEPE+ application, or MAX793TEPE+ equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1V, battery-switching hysteresis (15mV typical), low-line early-warning output (LOWLINE), BATT OK status monitoring, and manual reset input with internal 70µA pullup.
Technical Context
The MAX793TEPE+ implements a precision voltage comparator for reset generation with 10mV typical hysteresis to prevent oscillation during VCC transitions. Its battery switchover logic uses dual thresholds: VSW (2.55V–2.68V) for VCC-falling switchover to BATT, and VRST-based reconnection when VCC rises above reset threshold.
It integrates a dedicated watchdog timer that clears on any WDI transition and times out after 1.6s, driving WDO low; WDO can be connected to MR to generate automatic system resets. The CE IN-to-CE OUT transmission gate operates with <7ns propagation delay and disables during reset to protect CMOS RAM 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 supply drops below system tolerance limit |
| Battery Switch Threshold | 2.55V to 2.68V (VCC falling); enables seamless switchover to 3.6V lithium battery before VCC collapse |
| Reset Timeout Period | 200ms minimum; guarantees µP remains held in reset long enough for stable power-up initialization |
| Watchdog Timeout | 1.6s nominal; provides deterministic fault detection window for firmware liveliness monitoring |
| VCC Supply Current | 46µA typical at +25°C, VCC = 3.3V; enables ultra-low-power operation in always-on backup domains |
| CE Propagation Delay | ≤7ns max; preserves timing integrity of chip-enable signals during normal operation |
| RESET Assertion Range | Guaranteed to VCC = 1V; maintains reset validity even during deep brownout conditions |
Pinout & Package
MAX793TEPE+ is housed in a 16-pin plastic DIP package (0.300" wide), RoHS-compliant and lead-free (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT via internal p-channel MOSFET; connects to VCC when VCC > VRST or > VBATT |
| 2 VCC | Main supply input | Primary 3.0V/3.3V power rail; monitored for reset, low-line, and battery switchover decisions |
| 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 voltage for early warning; pulls PFO low when VPFI < 1.212V |
| 5 BATT ON | External bypass switch driver | Open-drain output indicating BATT is active; drives PMOS base/gate for >75mA load support |
| 6 GND | Ground reference | Common return path for all analog and digital functions; critical for comparator accuracy |
| 7 PFO | Power-fail comparator output | Active-low flag signaling VCC < VSW or PFI < VPFT; also enables battery freshness seal when pulled low |
| 8 MR | Manual reset input | Active-low input with 70µA internal pullup; asserts reset for 200ms after rising edge |
| 9 WDO | Watchdog output | Active-low open-drain output; goes low after 1.6s WDI inactivity; connects to MR for auto-reset |
| 10 WDI | Watchdog input | Accepts pulses ≥100ns; clears internal timer on every high/low transition |
| 11 CE IN | Chip-enable gating input | Controls CE signal path; high-impedance during reset to prevent spurious writes |
| 12 CE OUT | Chip-enable gating output | Passes CE IN when reset inactive; holds low for 10µs if CE IN was low at reset assertion |
| 13 RESET | Active-high reset output | Sourcing/sinking output; inverse of RESET; drives µP reset directly without pullup |
| 14 LOWLINE | Early power-fail warning | Active-low output asserting when VCC falls to VLR (VRST − 25mV typical); triggers NMI for graceful shutdown |
| 15 RESET | Active-low reset output | Open-drain output requiring external pullup; stays low until VCC > VRST + tRP (200ms) |
| 16 BATT | Backup battery input | Accepts 3.6V lithium cells; voltage may exceed VCC; isolated by freshness seal until first power cycle |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | Fixed 3.00V–3.15V trip point with 10mV hysteresis ensures noise-immune, repeatable reset assertion |
| Backup-battery switchover | Supports VBATT > VCC (up to 3.6V) with 15mV typical hysteresis to prevent oscillation during switchover |
| On-board CE gating | 7ns max propagation delay and automatic disable during reset prevents CMOS RAM corruption during undervoltage |
| Battery freshness seal | Internal disconnect isolates BATT from leakage paths until first VCC cycle, preserving shelf life of lithium backup cells |
| Integrated watchdog timer | 1.6s timeout with WDI edge-sensitive clearing enables robust firmware supervision without external components |
Applications
| Industrial Data Loggers | Medical Portable Monitors |
|---|---|
Use Scenario: Battery-powered field data acquisition units storing sensor readings to nonvolatile RAM during mains loss. IC Role / Device Role / Timing Role: Supervisory controller providing VCC brownout detection, automatic BATT switchover, and CE gating to preserve RAM integrity. Use Value: Ensures zero-data-loss operation during 200ms reset hold and eliminates RAM corruption risk via sub-7ns CE signal control. | Use Scenario: Handheld ECG or SpO₂ devices requiring continuous memory retention and fail-safe boot sequencing. IC Role / Device Role / Timing Role: Dual-role supervisor: generates clean reset pulse at power-up and asserts LOWLINE for early NMI-based state save before shutdown. Use Value: Guarantees µP enters known state at 3.3V ±5% supply tolerance and enables deterministic 2.5V BATT OK validation for clinical-grade reliability. |
| POS Terminals | Smart Energy Meters |
Use Scenario: Retail point-of-sale terminals with real-time clock and transaction log backed by lithium coin cell. IC Role / Device Role / Timing Role: Power management hub managing VCC monitoring, BATT switchover, and manual reset via front-panel button (MR). Use Value: Internal 70µA MR pullup eliminates external components; BATT OK output validates 2.0V minimum battery health before critical operations. | Use Scenario: DIN-rail mounted electricity meters operating across -40°C to +85°C with tamper-proof backup power. IC Role / Device Role / Timing Role: High-reliability supervisor delivering guaranteed reset down to VCC = 1V and temperature-stable reset threshold (±0.5% over range). Use Value: Maintains functional safety during extended brownouts; PFO-driven battery freshness seal extends 10-year meter battery life by blocking standby leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SEPE+ | Lower reset threshold range (2.85V–3.00V); higher hysteresis (15mV vs. 10mV typical) | Better suited for 3.3V ±10% supplies where earlier reset assertion is required | Select when system brownout margin requires reset before VCC reaches 2.85V |
| MAX795TEPA+ | 8-pin SO package; no LOWLINE, BATT OK, or watchdog; same T-suffix reset threshold | Space-constrained designs needing only core reset + battery switchover, no early warning or supervision | Choose for PCB area savings where CE gating and watchdog are unnecessary |
Compared with MAX793SEPE+, MAX793TEPE+ offers tighter reset threshold alignment with 3.3V ±5% systems and enables LOWLINE-triggered NMI. Against MAX795TEPA+, it adds full supervision capability (watchdog, BATT OK, early warning) at the cost of larger 16-pin footprint.
Availability
MAX793TEPE+ is available at Aetrix Electronics and suitable for industrial data loggers, medical portable monitors, POS terminals, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX793TEPE+ 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 computing applications.
The MAX793 series belongs to Maxim's microprocessor supervisory product line, designed specifically to ensure reliable power-up, brownout recovery, and battery-backed operation in 3.0V/3.3V embedded systems.
FAQ
What is the exact reset threshold voltage range for MAX793TEPE+?
The MAX793TEPE+ 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 asserted before VCC drops below 3.0V while avoiding false triggers above 3.15V. The threshold exhibits 10mV typical hysteresis to prevent chatter during slow VCC transitions. MAX793TEPE+ does not support adjustable reset like the MAX794.
Does MAX793TEPE+ support backup battery voltages higher than VCC?
Yes, MAX793TEPE+ supports VBATT up to 3.6V - exceeding typical 3.0V/3.3V VCC rails. Its internal p-channel MOSFET switchover circuit activates when VCC falls below the battery switch threshold (2.55V–2.68V), connecting BATT to OUT. The design includes 15mV typical hysteresis to prevent oscillation, and the BATT OK output validates battery health above 2.0V.
How does the manual reset (MR) function work on MAX793TEPE+?
The MR pin on MAX793TEPE+ is an active-low input with a built-in 70µA pullup current. Driving MR low asserts RESET for the duration of the low signal plus a guaranteed 200ms timeout after MR returns high. It accepts TTL/CMOS logic levels and can be connected directly to a momentary switch to GND. No external debounce components are needed due to internal timing control.
Can MAX793TEPE+ be used without a backup battery?
Yes, MAX793TEPE+ operates fully without a backup battery. Connect BATT to VCC and leave PFO unconnected (or tie to VCC) to disable battery-related functions. All core supervision features - reset generation, LOWLINE warning, CE gating, and watchdog - remain active. The device guarantees RESET assertion down to VCC = 1V in this configuration, making it suitable for single-rail systems.
What is the purpose of the LOWLINE output on MAX793TEPE+?
The LOWLINE output on MAX793TEPE+ is an active-low early power-fail warning signal that asserts when VCC falls to VRST minus 25mV (typical). It provides ~20–45mV advance notice before reset triggers, enabling the µP to execute critical tasks like saving state or logging data. LOWLINE can drive an NMI input for immediate firmware response, enhancing system robustness during brownout events.
MAX793TEPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX793TEPE+ FAQ
1.How can I place an order for MAX793TEPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793TEPE+ 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 MAX793TEPE+ reliable?
The price and inventory of MAX793TEPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793TEPE+ is usually 5 days.
3.What payment methods are accepted for MAX793TEPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793TEPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793TEPE+?
MAX793TEPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793TEPE+ 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 MAX793TEPE+?
For technical support, including MAX793TEPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793TEPE+ requirements.
6.How does Aetrix verify that MAX793TEPE+ is sourced from the original manufacturer or authorized distributors?
All MAX793TEPE+ 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 MAX793TEPE+ meets industry standards.
7.What is the process for return or replacement of MAX793TEPE+?
All MAX793TEPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX793TEPE+, 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 MAX793TEPE+ part is unused and in its original packaging.
Return procedure for MAX793TEPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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