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Analog Devices Inc./Maxim Integrated MAX793RCSE-T
- Part No.:
- MAX793RCSE-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793RCSE-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,854
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Product details
Overview
MAX793RCSE-T from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with fixed reset threshold (2.55V–2.70V), backup-battery switchover, active-low open-drain RESET output, and integrated chip-enable gating for CMOS RAM protection. It operates across -40°C to +85°C, supports VCC down to 1V for guaranteed reset assertion, and delivers 7ns max CE IN-to-CE OUT propagation delay in normal mode. Used in battery-backed embedded controllers requiring reliable power-fail detection and brownout immunity.
For engineers reviewing the MAX793RCSE-T datasheet, MAX793RCSE-T pinout, MAX793RCSE-T application, or MAX793RCSE-T equivalent, key selection criteria include its R-suffix reset threshold (2.55V–2.70V), 16-pin narrow SO package, battery-switching capability with VBATT > VCC support, and integrated watchdog timer (1.6s timeout) - all critical for low-voltage industrial controller and portable equipment designs.
Technical Context
The MAX793RCSE-T implements a precision voltage-monitoring comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the reset threshold. Its internal p-channel MOSFET switch enables seamless switchover from VCC to BATT when VCC falls below VSW (2.52V min), with 15mV typical hysteresis on the VCC-to-VBATT comparator.
It integrates a dedicated low-line comparator (VLR = 2.55V–2.70V) that asserts LOWLINE before reset for early NMI-based power-fail warning, and features an uncommitted PFI/PFO comparator usable for external power-fail detection or battery freshness seal activation via PFO grounding.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V–2.70V (R-suffix); ensures reliable reset assertion before 3.0V system brownout |
| Reset Timeout Period | 200ms; guarantees µP remains held in reset long enough for stable power recovery |
| Battery Switch Threshold | 2.52V min (VCC falling); triggers automatic switchover to backup battery before system collapse |
| VCC Supply Current | 32µA–45µA at VCC = 2.1V; enables ultra-low-power operation in battery-backed sleep modes |
| CE IN-to-CE OUT Delay | 7ns max; preserves timing integrity for high-speed µP address/data bus gating |
| Watchdog Timeout | 1.6s; provides robust software hang detection without external components |
| Operating Temp Range | -40°C to +85°C; qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MAX793RCSE-T is housed in a 16-pin narrow SO (SOIC-16) package with 1.27mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Supply output for CMOS RAM | Switches between VCC and BATT; connects to RAM VDD to maintain data during main supply loss |
| VCC (Pin 2) | Main supply input | Primary 3.0V/3.3V system rail; powers internal logic and enables reset monitoring |
| GND (Pin 6) | Ground reference | Common return path for all analog comparators, digital outputs, and switching FETs |
| PFI (Pin 4) | Power-fail comparator input | Monitors external voltage (e.g., +5V rail); drives PFO low when input drops below 1.212V |
| PFO (Pin 7) | Power-fail comparator output | Open-drain output used for external power-fail signaling or battery freshness seal enable |
| RESET (Pin 15) | Active-low open-drain reset output | Drives µP reset pin low for 200ms; requires external pullup to VCC (4.7kΩ–1MΩ) |
| RESET (Pin 13) | Active-high reset output | Sources/sinks current; inverse of RESET; directly interfaces with µP reset inputs needing active-high assertion |
| MR (Pin 8) | Manual reset input | Active-low input with 70µA internal pullup; initiates reset on logic-low pulse ≥100ns |
| WDI (Pin 10) | Watchdog input | Accepts µP-generated pulses; failure to toggle within 1.6s triggers WDO low |
| WDO (Pin 9) | Watchdog output | Open-drain output; low on timeout; can be diode-OR'd to MR for automatic fault-induced reset |
| LOWLINE (Pin 14) | Early power-fail warning output | Asserts low when VCC drops to VLR (2.55V–2.70V); used for NMI generation prior to full reset |
| CE IN (Pin 11) | Chip-enable input | Passes µP CE signal to CE OUT only when reset is deasserted; prevents RAM corruption |
| CE OUT (Pin 12) | Chip-enable output | Drives RAM chip-enable; gated off during reset to block erroneous writes during undervoltage |
| BATT (Pin 16) | Backup-battery input | Accepts 3.6V lithium cell; VBATT may exceed VCC; enables seamless backup power delivery |
| BATT ON (Pin 5) | Battery status indicator | Logic-high when OUT is sourced from BATT; drives external PMOS gate for >75mA load support |
| BATT OK (Pin 3) | Battery health monitor | High when VBATT > 2.0V; continuously checked; disabled if VCC < VSW |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | Fixed 2.55V–2.70V trip point with 10mV hysteresis ensures deterministic reset timing in 3.0V systems |
| Backup-battery switchover | VBATT > VCC supported (e.g., 3.6V Li+ on 3.0V system); automatic transition at 2.52V with 15mV hysteresis |
| Chip-enable gating | 7ns max propagation delay and 46Ω series resistance preserve µP bus timing while blocking invalid writes |
| Low-line early warning | LOWLINE output asserts at same threshold as reset, enabling NMI-based pre-reset system response |
| Integrated watchdog timer | 1.6s timeout with WDI edge-sensitive input eliminates need for external RC or dedicated watchdog IC |
| Battery freshness seal | Enables OEM battery preservation by disconnecting BATT until first power-up sequence completes |
Applications
| Industrial Data Logger | Medical Portable Monitor |
|---|---|
Use Scenario: Battery-powered field logger capturing sensor data during mains outage. IC Role / Device Role / Timing Role: Supervisory circuit maintains CMOS RAM state via BATT-backed OUT, asserts RESET to halt corrupted writes, and triggers LOWLINE NMI to initiate graceful shutdown. Use Value: Prevents data loss during 3.0V rail collapse; 2.55V reset threshold aligns with 3.0V ±10% supply tolerance; BATT OK confirms lithium cell health before deployment. | Use Scenario: Handheld vital-signs monitor with nonvolatile memory retention during battery swaps. IC Role / Device Role / Timing Role: MAX793RCSE-T gates CE signals to SRAM during VCC dip, asserts RESET to freeze processor state, and uses WDO-MR diode-OR to auto-recover from firmware hangs. Use Value: 1.6s watchdog prevents silent lockups; 7ns CE delay preserves real-time sampling integrity; BATT ON output drives external PMOS for >75mA backup load. |
| Smart Energy Meter | Ruggedized PLC I/O Module |
Use Scenario: DIN-rail meter storing tariff data and event logs across AC power interruptions. IC Role / Device Role / Timing Role: Monitors 3.3V auxiliary rail; asserts RESET before brownout, uses PFI to detect 24V DC supply failure, and enables battery freshness seal for 10-year shelf life. Use Value: PFO-driven seal ensures backup battery remains unused until installation; 200ms reset timeout satisfies IEC 62053-21 write-protection requirements. | Use Scenario: Industrial I/O module operating in -40°C to +85°C environments with intermittent 24VDC input. IC Role / Device Role / Timing Role: Provides cold-temperature reset assurance (guaranteed to VCC = 1V), monitors local 3.0V LDO output, and gates CE to EEPROM during undervoltage transients. Use Value: -40°C to +85°C rating meets EN 61000-6-2; 32µA supply current minimizes self-heating; VCC-to-OUT on-resistance <160Ω at -40°C ensures stable RAM VDD. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SCSE-T | Higher reset threshold (2.85V–3.00V); identical pinout, package, and feature set | Targeted at 3.3V ±10% supplies rather than 3.0V ±10%; less margin for deep brownouts | Select when system VCC nominal is 3.3V and brownout depth is shallower; verify compatibility with existing PCB layout |
| MAX795RCSE-T | 8-pin SO package (vs. 16-pin); omits LOWLINE, WDI/WDO, BATT OK, and CE gating; retains RESET, PFI/PFO, MR, BATT switchover | Reduced-feature variant for space-constrained designs where watchdog and early warning are unnecessary | Choose for minimal footprint and cost savings where full MAX793 functionality is not required; no PCB redesign needed due to different pin count |
Compared with MAX793SCSE-T, the MAX793RCSE-T offers deeper brownout immunity (2.55V vs. 2.85V trip), making it preferable for 3.0V systems with wide tolerance. Against MAX795RCSE-T, it provides full supervisory capability-including watchdog, CE gating, and dual reset outputs-at the cost of larger 16-pin SO packaging.
Availability
MAX793RCSE-T is available at Aetrix Electronics and suitable for industrial data loggers, medical portable monitors, smart energy meters, and ruggedized PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX793RCSE-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 design house specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX793 family is designed as a precision 3.0V/3.3V microprocessor supervisory solution targeting battery-backed embedded systems requiring guaranteed reset assertion, backup power switchover, and integrated reliability features like watchdog and CE gating.
FAQ
What is the exact reset threshold voltage range for MAX793RCSE-T?
The MAX793RCSE-T has a fixed reset threshold range of 2.55V to 2.70V (R-suffix), specified for VCC falling. This range is optimized for 3.0V ±10% power supplies and ensures reset assertion before critical brownout levels. The device guarantees reset assertion down to VCC = 1V, and the threshold includes 10mV typical hysteresis to prevent chatter near the trip point. All specifications are validated per Maxim's official datasheet Rev 6 (19-0366).
Does MAX793RCSE-T support backup batteries with voltage higher than VCC?
Yes, MAX793RCSE-T explicitly supports VBATT > VCC - for example, a 3.6V lithium coin cell on a 3.0V system. Its internal p-channel MOSFET switch enables automatic switchover from VCC to BATT when VCC falls below the battery switch threshold (VSW = 2.52V min). The datasheet confirms VBATT can reach up to +6.0V absolute maximum, and the switchover includes 15mV typical hysteresis to prevent oscillation. This capability is integral to the MAX793RCSE-T's role in long-life battery-backed applications.
How does the chip-enable (CE) gating function work in MAX793RCSE-T?
The MAX793RCSE-T implements CE gating using an internal transmission gate between CE IN (Pin 11) and CE OUT (Pin 12). During normal operation (reset deasserted), CE transitions pass through with ≤7ns propagation delay. When reset is asserted, the gate disables - blocking CE signals to prevent RAM corruption during undervoltage. If CE IN is low at reset assertion, CE OUT stays low for ~10µs to complete the current write cycle. This behavior is fully characterized and guaranteed across -40°C to +85°C for the MAX793RCSE-T.
Can MAX793RCSE-T generate a reset pulse automatically when the watchdog times out?
Yes, MAX793RCSE-T supports automatic reset-on-watchdog-fault via external diode-OR connection of WDO (Pin 9) to MR (Pin 8). When WDO goes low after 1.6s of WDI inactivity, it pulls MR low, triggering a 200ms RESET pulse. The datasheet Figure 6 confirms this configuration, and notes a 10µs WDO pulse width in this mode - sufficient for external fault capture. This functionality is inherent to the MAX793RCSE-T's architecture and requires no additional ICs or firmware changes.
What is the purpose and activation method of the battery freshness seal in MAX793RCSE-T?
The battery freshness seal in MAX793RCSE-T disconnects the backup battery from internal circuitry until first use, preserving shelf life. To activate it: connect battery to BATT, ground PFO (Pin 7), bring VCC above VRST, hold until reset deasserts (~200ms), then cycle VCC low and high again. Once enabled, the seal remains active until VCC exceeds VRST. This process is documented in the MAX793RCSE-T datasheet Figure 4 and applies only to MAX793/MAX794 variants - not MAX795.
MAX793RCSE-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:
- 2.625V
- 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
MAX793RCSE-T FAQ
1.How can I place an order for MAX793RCSE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793RCSE-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 MAX793RCSE-T reliable?
The price and inventory of MAX793RCSE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793RCSE-T is usually 5 days.
3.What payment methods are accepted for MAX793RCSE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793RCSE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793RCSE-T?
MAX793RCSE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793RCSE-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 MAX793RCSE-T?
For technical support, including MAX793RCSE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793RCSE-T requirements.
6.How does Aetrix verify that MAX793RCSE-T is sourced from the original manufacturer or authorized distributors?
All MAX793RCSE-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 MAX793RCSE-T meets industry standards.
7.What is the process for return or replacement of MAX793RCSE-T?
All MAX793RCSE-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX793RCSE-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 MAX793RCSE-T part is unused and in its original packaging.
Return procedure for MAX793RCSE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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