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Analog Devices Inc./Maxim Integrated MAX793RCSE
- Part No.:
- MAX793RCSE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793RCSE.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,006
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Product details
Overview
MAX793RCSE 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 reset output, and integrated watchdog timer (1.6s timeout). It monitors VCC in embedded controllers and portable equipment, asserts reset below threshold, and gates CE signals to protect CMOS RAM during undervoltage events.
For engineers reviewing the MAX793RCSE datasheet, MAX793RCSE pinout, MAX793RCSE application, or MAX793RCSE equivalent, this page delivers verified specifications, validated 16-pin narrow SO package mapping, confirmed battery-switching behavior (VBATT > VCC supported), and two rigorously cross-checked alternative supervisory ICs for 3.0V systems.
Technical Context
The MAX793RCSE implements a precision voltage comparator with 2.55V–2.70V reset threshold (R-suffix), guaranteed reset assertion down to VCC = 1V, and internal 200ms reset timeout. Its battery switchover circuit uses a p-channel MOSFET switch with VSW = 2.52V (VCC falling) and hysteresis to prevent oscillation.
It integrates a 1.6s watchdog timer (WDI input, WDO output), manual reset input (MR) with 70µA internal pullup and 200ms deassertion delay, and chip-enable gating with ≤7ns propagation delay. The BATT OK output continuously monitors VBATT against 2.0V threshold and disables when VCC < VSW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.55V–2.70V (R-suffix); ensures reliable reset before 3.0V system brownout |
| Watchdog Timeout | 1.6s; detects µP lockup and triggers WDO low for fault recovery |
| Battery Switch Threshold | 2.52V (VCC falling); enables seamless switchover to 3.6V lithium backup |
| Reset Timeout Period | 200ms; guarantees µP initialization stability after power recovery |
| CE IN-to-CE OUT Delay | ≤7ns; preserves timing integrity for high-speed memory access control |
| VCC Supply Current | 46µA typical (3.3V); minimizes quiescent load in battery-backed systems |
| BATT Leakage Current | 1µA max; extends shelf life of backup battery during storage |
Pinout & Package
MAX793RCSE is housed in a 16-pin narrow SO (Small Outline) package, RoHS-compliant, with 0.3-inch body width and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during main/battery modes |
| 2 VCC | Main Supply Input | Primary 3.0V/3.3V power rail; reset monitoring and logic supply source |
| 3 RESET IN | Reset Threshold Input | Not used on MAX793RCSE (fixed-threshold variant); left unconnected |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage; pulls PFO low if below 1.212V threshold |
| 5 BATT ON | Battery-On Indicator | Open-drain output high when OUT is sourced from BATT; drives external PMOS gate |
| 6 GND | Ground Reference | Common return path for all analog and digital functions |
| 7 PFO | Power-Fail Output | Active-low open-drain flag signaling VCC < VSW or PFI < VPFT; enables battery freshness seal |
| 8 MR | Manual Reset Input | Active-low input with 70µA internal pullup; asserts reset for ≥200ms after release |
| 9 WDO | Watchdog Output | Active-low open-drain output; goes low after 1.6s WDI inactivity; resets µP when tied to MR |
| 10 WDI | Watchdog Input | Edge-sensitive input; clears 1.6s timer on any transition; minimum pulse width 100ns |
| 11 CE IN | Chip-Enable Input | Controls gating path; high-impedance during reset to isolate memory interface |
| 12 CE OUT | Chip-Enable Output | Gated CE signal; disabled during reset to prevent corrupted writes to CMOS RAM |
| 13 RESET | Active-High Reset Output | Pull-up capable output sourcing/sinking current; inverse of RESET; no external pullup needed |
| 14 LOWLINE | Early Warning Output | Active-low comparator output asserting at VCC = VLR (2.55V–2.70V − 30mV); triggers NMI pre-reset |
| 15 RESET | Active-Low Reset Output | Open-drain output requiring external pullup; asserts low for 200ms on power-up/fall/brownout |
| 16 BATT | Backup-Battery Input | Accepts up to 6.0V; enables switchover when VCC falls below VSW; supports 3.6V lithium cells |
Key Features
| Feature | Design Value |
|---|---|
| Precision Fixed Reset Threshold | R-suffix guarantees 2.55V–2.70V trip point for 3.0V ±10% systems, eliminating external resistor network |
| Backup-Battery Switchover | Supports VBATT > VCC (e.g., 3.6V Li) with <15mV hysteresis to prevent oscillation during transition |
| Integrated Watchdog Timer | 1.6s timeout with edge-triggered WDI input; WDO output directly resets µP via MR connection |
| Chip-Enable Gating | 7ns max CE IN-to-CE OUT delay; blocks erroneous writes to CMOS RAM during undervoltage |
| Battery Freshness Seal | Enables OEM battery preservation by disconnecting BATT until first power cycle completes |
| Low-Line Early Warning | LOWLINE output asserts 30mV below reset threshold, enabling NMI-based graceful shutdown before reset |
Applications
| Battery-Powered Embedded Controllers | Intelligent Portable Equipment |
|---|---|
Use Scenario: Industrial data logger operating on primary 3.0V supply with 3.6V lithium backup, requiring nonvolatile RAM retention during mains loss. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, automatic battery switchover, and CE gating to preserve RAM contents. Use Value: Ensures uninterrupted RAM operation during 100ms–5s power interruptions via seamless BATT/VCC handoff and write-protection. |
Use Scenario: Handheld medical monitor with real-time sensor logging, powered by rechargeable Li-ion, needing fail-safe boot and brownout recovery. IC Role / Device Role / Timing Role: Resets µP on VCC drop below 2.55V, asserts LOWLINE 30mV earlier for warning interrupt, and guards against software hang via 1.6s watchdog. Use Value: Prevents corrupted measurements and unsafe state transitions by enforcing deterministic reset and early power-fail alerting. |
| Critical µP Power Monitoring | CMOS RAM Protection Systems |
Use Scenario: Telecom base station controller where µP must never execute invalid code due to marginal VCC during thermal stress or aging. IC Role / Device Role / Timing Role: Precision voltage supervisor asserting reset within 200ms of VCC crossing 2.55V–2.70V window, with guaranteed validity down to VCC = 1V. Use Value: Eliminates risk of undefined µP behavior during slow-ramp power-up or gradual brownout by enforcing strict voltage compliance. |
Use Scenario: Set-top box with configuration EEPROM and SRAM cache, requiring write protection during undervoltage conditions. IC Role / Device Role / Timing Role: CE gating circuit disabling CE OUT when reset is asserted, blocking memory writes during unstable VCC. Use Value: Prevents bit corruption in nonvolatile storage by halting memory access for full 200ms reset duration and beyond. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACSE+ | 5V-only operation; 4.65V reset threshold; no battery switchover or watchdog | Suitable only for 5V legacy systems; lacks BATT support and early-warning outputs | Select when upgrading 5V designs without battery backup or low-voltage warning needs |
| TPS3808G33DBVR | 3.3V fixed threshold (3.08V); no BATT switching; no CE gating; push-pull RESET | Designed for simple reset-only use cases; requires external circuitry for battery management | Choose for cost-sensitive 3.3V applications where battery backup and memory gating are unnecessary |
Compared with MAX793RCSE, MAX691ACSE+ serves 5V-only environments without battery support, while TPS3808G33DBVR offers lower-cost reset supervision but omits critical features like backup switchover, CE gating, and LOWLINE warning-making MAX793RCSE uniquely suited for robust 3.0V battery-backed embedded controllers.
Availability
MAX793RCSE is available at Aetrix Electronics and suitable for battery-powered computers, intelligent portable equipment, and critical µP power monitoring requiring stable component supply across industrial temperature ranges (0°C to +70°C).
Supply support for MAX793RCSE 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 connectivity in demanding industrial and embedded applications.
The MAX793 family targets 3.0V/3.3V microprocessor supervision with integrated battery switchover, watchdog, and memory protection-optimized for reliability-critical portable and embedded controllers.
FAQ
What is the exact reset threshold voltage range for MAX793RCSE?
The MAX793RCSE has an R-suffix, specifying a fixed reset threshold range of 2.55V to 2.70V (VCC falling), optimized for 3.0V ±10% power supplies. This range is factory-trimmed and does not require external resistors. The threshold exhibits 10mV typical hysteresis to prevent chatter during voltage transitions, and reset is guaranteed to assert before VCC falls below 2.55V.
Does MAX793RCSE support backup batteries with voltage higher than VCC?
Yes, MAX793RCSE explicitly supports VBATT > VCC, including standard 3.6V lithium coin cells in 3.0V/3.3V systems. Its internal p-channel MOSFET switch activates when VCC falls below the battery switch threshold (VSW = 2.52V typical), connecting BATT to OUT. The device tolerates VBATT up to +6.0V and includes 15mV hysteresis to prevent oscillation during switchover.
How does the watchdog function operate in MAX793RCSE?
The MAX793RCSE watchdog monitors the WDI input and triggers WDO low if no edge occurs within 1.6s. WDO returns high on the next WDI transition. When WDO is tied to MR, it generates a 200ms reset pulse per fault. The timer clears automatically on reset assertion or WDI activity-no disable function exists. Minimum detectable WDI pulse width is 100ns.
What is the purpose and activation method of the BATT OK output on MAX793RCSE?
The BATT OK output on MAX793RCSE indicates backup battery health: it is high when VBATT exceeds 2.0V (VBOK min) and VCC > VSW, and low otherwise. It is continuously monitored in normal operation and disabled during VCC undervoltage. This signal allows system firmware to log battery status or trigger replacement alerts without external components.
Can MAX793RCSE be used to protect CMOS RAM during power failure?
Yes, MAX793RCSE provides dual-layer CMOS RAM protection: (1) CE IN-to-CE OUT gating disables memory access during reset, preventing writes under unstable VCC; (2) OUT switchover maintains clean 3.0V/3.3V supply to RAM from BATT during mains loss. The CE path has ≤7ns delay and holds CE OUT low for 10µs after reset assertion to complete pending writes.
MAX793RCSE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MAX793RCSE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793RCSE 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 reliable?
The price and inventory of MAX793RCSE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793RCSE is usually 5 days.
3.What payment methods are accepted for MAX793RCSE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793RCSE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793RCSE?
MAX793RCSE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793RCSE 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?
For technical support, including MAX793RCSE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793RCSE requirements.
6.How does Aetrix verify that MAX793RCSE is sourced from the original manufacturer or authorized distributors?
All MAX793RCSE 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 meets industry standards.
7.What is the process for return or replacement of MAX793RCSE?
All MAX793RCSE units undergo pre-shipment inspection (PSI). If there is an issue with MAX793RCSE, 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 part is unused and in its original packaging.
Return procedure for MAX793RCSE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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