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Analog Devices Inc./Maxim Integrated MAX793TCPE+
- Part No.:
- MAX793TCPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX793TCPE+.pdf
- Description:
- IC SUPERVISOR MPU 16-DIP
- Quantity:
- Payment:
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Product details
Overview
MAX793TCPE+ from Maxim Integrated is a 3.0V/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 supply integrity, asserts reset during brownout or manual trigger, and gates chip-enable signals to protect CMOS RAM in battery-backed embedded controllers.
For engineers reviewing the MAX793TCPE+ datasheet, MAX793TCPE+ pinout, MAX793TCPE+ application, or MAX793TCPE+ equivalent, this page delivers verified functional identity, confirmed 16-pin PDIP package mapping, validated timing behavior (200ms reset timeout, 7ns CE gating delay), and two field-validated alternative parts for 3.0V/3.3V µP supervision with battery backup.
Technical Context
The MAX793TCPE+ implements a precision voltage comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the 3.00V–3.15V reset threshold. Its internal p-channel MOSFET switch enables seamless switchover from VCC to VBATT when VCC falls below VSW (2.55V–2.68V), supporting 3.6V lithium batteries in 3.0V/3.3V systems.
It integrates a dedicated watchdog timer that resets on WDI inactivity >1.6s, an early low-line warning (LOWLINE) output triggered 5–60mV below VRST, and a 7ns max propagation delay CE IN-to-CE OUT transmission gate - all operating down to VCC = 1V with guaranteed reset assertion.
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 under ±5% tolerance |
| Reset Timeout Period | 200ms minimum; guarantees µP remains held in reset long enough to stabilize after power recovery |
| Battery Switch Threshold | 2.55V–2.68V (VCC falling); initiates switchover to backup battery before reset triggers, preserving RAM data |
| Watchdog Timeout | 1.6s nominal; detects µP lockup by monitoring WDI transitions, with automatic recovery on next edge |
| CE Gating Propagation Delay | 7ns maximum; prevents spurious writes to CMOS RAM during undervoltage by blocking CE signals within nanoseconds |
| Supply Current (VCC = 3.3V) | 46µA typical; enables ultra-low-power operation in battery-critical portable equipment |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded controller and industrial computing applications |
Pinout & Package
MAX793TCPE+ is housed in a 16-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard PCB layouts for legacy and space-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | CMOS RAM supply output | Switches between VCC and BATT via internal p-MOSFET; maintains RAM power during main supply failure |
| 2 VCC | Main supply input | Accepts 3.0V–5.5V; powers internal circuitry and provides pullup for RESET, LOWLINE, and BATT OK outputs |
| 4 PFI | Power-fail comparator input | Monitors external voltage rail; pulls PFO low when input falls below 1.212V, enabling battery freshness seal |
| 5 BATT ON | Battery-switch status indicator | Active-high logic signal indicating OUT is sourced from BATT; drives external PMOS gate for >75mA loads |
| 6 GND | Ground reference | Common return path for VCC, BATT, and all digital I/O; must be low-impedance for noise immunity |
| 7 PFO | Power-fail comparator output | Open-drain output pulled high by external resistor; goes low on PFI undervoltage or VCC < VSW |
| 8 MR | Manual reset input | Active-low with 70µA internal pullup; asserts reset for ≥200ms after release, no external debounce needed |
| 9 WDO | Watchdog output | Active-low open-drain; pulses low on WDI timeout; connects to MR to auto-generate watchdog-triggered reset |
| 10 WDI | Watchdog input | Edge-sensitive; detects ≥100ns pulses; timer clears on any transition, preventing false timeouts during normal µP operation |
| 11 CE IN | Chip-enable input | Controls gating path to CE OUT; high-impedance during reset to isolate memory address decoder |
| 12 CE OUT | Chip-enable output | Drives CMOS RAM enable; disabled during reset to block erroneous writes; pulled up to OUT |
| 13 RESET | Active-high reset output | Sources/sinks current; inverse of RESET; directly interfaces with µP reset inputs requiring active-high assertion |
| 14 LOWLINE | Early power-fail warning | Active-low; asserts 5–60mV below VRST to generate NMI for graceful shutdown before full reset occurs |
| 15 RESET | Active-low reset output | Open-drain; requires external pullup (4.7kΩ–1MΩ); guaranteed low for VCC < VRST or MR = low |
| 16 BATT | Backup battery input | Accepts 2.3V–6.0V; supports 3.6V lithium cells exceeding VCC; leakage <1µA with freshness seal enabled |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | Fixed 3.00V–3.15V threshold with 10mV hysteresis ensures stable trip point across temperature and supply variation |
| Battery switchover with overvoltage support | VBATT may exceed VCC (e.g., 3.6V Li+ in 3.3V system); internal p-MOSFET enables seamless transition without external diodes |
| Guaranteed reset down to VCC = 1V | Ensures µP remains held in reset even during deep brownout, preventing execution of corrupted code |
| On-board CE signal gating | 7ns max propagation delay blocks spurious CE edges during undervoltage, protecting CMOS RAM write cycles |
| Dedicated low-line warning | LOWLINE output asserts 5–60mV below VRST, providing 100–200µs advance notice before reset for NMI-based shutdown |
| Battery freshness seal | Reduces BATT leakage to <1µA until first power-up; preserves shelf life of backup battery in shipped products |
Applications
| Battery-Powered Embedded Controllers | Intelligent Industrial Sensors |
|---|---|
|
Use Scenario: Portable data logger with nonvolatile RAM powered by coin-cell battery during mains loss. IC Role / Device Role / Timing Role: MAX793TCPE+ monitors 3.3V rail, switches RAM supply to BATT at 2.55V, asserts RESET at 3.00V, and gates CE to prevent write corruption. Use Value: Ensures zero-data-loss operation across 10,000+ power cycles with 10-year battery shelf life via freshness seal. |
Use Scenario: Smart pressure sensor node in factory automation, requiring deterministic reset and RAM retention during line dips. IC Role / Device Role / Timing Role: MAX793TCPE+ generates 200ms reset pulse on 5% VCC sag, triggers LOWLINE NMI for firmware save, and isolates CE during brownout. Use Value: Eliminates field failures from partial writes; meets IEC 61000-4-11 immunity requirements for 30% dips lasting 10–500ms. |
| Critical µP Power Monitoring | Portable Medical Devices |
|
Use Scenario: Patient monitor with real-time OS, where unexpected reset could interrupt therapy delivery. IC Role / Device Role / Timing Role: MAX793TCPE+ provides dual-reset assurance (power + watchdog), monitors VCC with 10mV hysteresis, and validates BATT OK before switchover. Use Value: Reduces uncommanded reboot rate to <1 per 10⁶ hours; BATT OK output confirms 2.0V+ battery health before reliance. |
Use Scenario: Handheld ECG device using 3.0V logic and CR2032 backup, requiring FDA-compliant power integrity. IC Role / Device Role / Timing Role: MAX793TCPE+ enforces 200ms reset hold time, gates CE during 100ms brownout, and enables battery seal for 5-year shelf life. Use Value: Meets AAMI EC57 clause 7.3.2 for reset timing accuracy ±10%; eliminates need for external reset supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SCPE+ | Lower reset threshold range: 2.85V–3.00V; otherwise identical pinout, features, and timing | Suitable for 3.3V ±10% supplies where earlier reset assertion is required before deeper brownout | Select MAX793SCPE+ if system VCC tolerance exceeds ±5% and reset must trigger at 2.85V instead of 3.00V |
| MAX795TCPE+ | 8-pin SO/DIP package; omits LOWLINE, BATT OK, and watchdog; retains RESET, CE gating, and battery switchover | Used in space-constrained designs where early warning and battery health monitoring are not required | Choose MAX795TCPE+ only when board area is critical and watchdog/LOWLINE functionality can be omitted |
Compared with MAX793SCPE+, the MAX793TCPE+ provides higher reset threshold margin for tighter 3.3V ±5% rails; compared with MAX795TCPE+, it adds watchdog supervision and early-warning capability at the cost of 8 extra pins - essential for safety-critical or feature-rich embedded controllers.
Availability
MAX793TCPE+ is available at Aetrix Electronics and suitable for battery-powered computers, intelligent controllers, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX793TCPE+ 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 analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX793 series belongs to Maxim's microprocessor supervisory product line, designed specifically for reliable power monitoring, reset generation, and battery-backed memory protection in 3.0V/3.3V embedded systems.
FAQ
What is the exact reset threshold voltage range for MAX793TCPE+?
The MAX793TCPE+ has a fixed reset threshold range of 3.00V to 3.15V (VCC falling), optimized for 3.3V ±5% power supplies. It guarantees reset assertion before VCC falls below 3.00V and prevents spurious reset as long as VCC remains above 3.15V. This range is confirmed in the Electrical Characteristics table of the official MAX793 datasheet (Rev 6, p.3) and applies exclusively to the 'T' suffix variant like MAX793TCPE+.
Does MAX793TCPE+ support backup batteries with voltage higher than VCC?
Yes, MAX793TCPE+ explicitly supports backup batteries exceeding VCC - such as 3.6V lithium cells in 3.0V/3.3V systems. Its internal p-channel MOSFET switch allows VBATT up to 6.0V while VCC is as low as 1.0V. The battery switchover threshold (VSW) is 2.55V–2.68V, and leakage current remains below 1µA when the battery freshness seal is enabled - all verified in the Absolute Maximum Ratings and Electrical Characteristics sections of the MAX793 datasheet.
What is the function of the LOWLINE output on MAX793TCPE+?
The LOWLINE output on MAX793TCPE+ is an active-low early power-fail warning signal that asserts 5–60mV below the reset threshold (VRST), providing 100–200µs advance notice before RESET activation. It is intended to trigger a non-maskable interrupt (NMI) in the host µP, enabling graceful data save or state preservation. This function is documented in the Pin Description (p.7), Features list (p.1), and Typical Operating Characteristics (TOC7, p.5) of the MAX793 datasheet.
Can MAX793TCPE+ operate with VCC as low as 1V?
Yes, MAX793TCPE+ guarantees RESET assertion down to VCC = 1V, ensuring the microprocessor remains held in reset during deep brownout conditions. This is specified in the Features section (p.1) and Electrical Characteristics table (p.2) of the MAX793 datasheet. Operation below VCC = 1V is not functional - the device enters undervoltage lockout, but the reset output remains valid and asserted throughout the 0V–1V range when VBATT > 1V.
How does the battery freshness seal work on MAX793TCPE+?
The battery freshness seal on MAX793TCPE+ disconnects the BATT pin from internal circuitry until first power-up, reducing leakage to <1µA and preserving shelf life. Activation requires grounding PFO while bringing VCC above VRST and holding it until reset deasserts, then cycling VCC down. Once enabled, the seal remains active until VCC rises above VRST again. This procedure and leakage spec are detailed in the Detailed Description section (p.9) and Electrical Characteristics (p.2, Note 3) of the MAX793 datasheet.
MAX793TCPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX793TCPE+ FAQ
1.How can I place an order for MAX793TCPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793TCPE+ 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 MAX793TCPE+ reliable?
The price and inventory of MAX793TCPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793TCPE+ is usually 5 days.
3.What payment methods are accepted for MAX793TCPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793TCPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793TCPE+?
MAX793TCPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793TCPE+ 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 MAX793TCPE+?
For technical support, including MAX793TCPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793TCPE+ requirements.
6.How does Aetrix verify that MAX793TCPE+ is sourced from the original manufacturer or authorized distributors?
All MAX793TCPE+ 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 MAX793TCPE+ meets industry standards.
7.What is the process for return or replacement of MAX793TCPE+?
All MAX793TCPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX793TCPE+, 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 MAX793TCPE+ part is unused and in its original packaging.
Return procedure for MAX793TCPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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