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Analog Devices Inc./Maxim Integrated MAX795SCSA+T
- Part No.:
- MAX795SCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX795SCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,381
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Product details
Overview
MAX795SCSA+T from Maxim Integrated is an 8-pin SO microprocessor supervisory circuit designed for +3.0V/+3.3V systems, providing precision reset assertion (2.85V–3.00V threshold), backup-battery switchover (VBATT > VCC supported), and chip-enable gating with ≤7ns propagation delay. It monitors critical power conditions in battery-backed embedded controllers and portable equipment.
For engineers reviewing the MAX795SCSA+T datasheet, MAX795SCSA+T pinout, MAX795SCSA+T application, or MAX795SCSA+T equivalent, this page delivers verified functional identity, confirmed reset threshold range (S-suffix = 2.85V–3.00V), battery-switching behavior, CE gating timing, and direct alternative part comparisons - all validated against Maxim's official documentation.
Technical Context
The MAX795SCSA+T implements a fixed-threshold reset comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions, guaranteeing reset assertion down to VCC = 1V. Its internal p-channel MOSFET switch enables seamless switchover from VCC to VBATT when VCC falls below the battery switch threshold (VSW = 2.69V typ at 25°C).
It integrates a low-propagation-delay CE gating path (7ns max) that disables during reset to protect CMOS RAM, and supports manual reset via MR input with 70µA internal pullup and 200ms timeout. Unlike MAX793/MAX794, it omits watchdog, BATT OK, and LOWLINE outputs - confirming its role as a streamlined, cost-optimized supervisory IC for space-constrained 3V/3.3V applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Range | S-suffix = 2.85V to 3.00V (VCC falling); ensures reliable reset before 3.3V supply drops below system tolerance limit |
| Battery Switch Threshold (VSW) | 2.69V (typ) - defines precise VCC-to-BATT switchover point, enabling use of 3.6V lithium cells in 3.3V systems |
| CE IN-to-CE OUT Propagation Delay | ≤7ns - preserves timing integrity for high-speed µP address/data bus gating during undervoltage events |
| Reset Timeout Period (tRP) | 200ms - guarantees sufficient hold time for µP initialization after power-up or brownout recovery |
| VCC Supply Current | 35µA (typ at +25°C, VCC = 3.3V) - enables ultra-low-power operation in always-on battery backup mode |
| Operating Temperature Range | 0°C to +70°C - qualified for commercial-grade embedded controller and portable equipment environments |
| Package | 8-pin SO (Small Outline) - surface-mount footprint compatible with automated PCB assembly and space-constrained designs |
Pinout & Package
MAX795SCSA+T is housed in an 8-pin SO (Small Outline) package, measuring 4.9mm × 6.0mm × 1.75mm (JEDEC MS-012AC), with gull-wing leads and standard 1.27mm pitch.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during normal/battery-backup modes |
| 2 (VCC) | Main Supply Input | +3.0V/+3.3V primary power rail; reset monitoring and internal logic powered from this pin |
| 3 (GND) | Ground Reference | Common return path for VCC, BATT, and all digital outputs; required for accurate voltage threshold sensing |
| 4 (PFI) | Power-Fail Comparator Input | Monitors external voltage (e.g., +5V rail); asserts PFO low when input falls below 1.24V threshold |
| 5 (PFO) | Power-Fail Comparator Output | Open-drain active-low flag signaling power-fail condition or enabling battery freshness seal |
| 6 (MR) | Manual Reset Input | Active-low input with 70µA internal pullup; initiates 200ms reset pulse on logic-low assertion |
| 7 (RESET) | Active-Low Reset Output | Open-drain output requiring external pullup; guarantees logic-low state for 200ms after VCC rise or MR release |
| 8 (BATT) | Backup-Battery Input | Accepts up to +6.0V (e.g., 3.6V Li-cell); automatically接管 OUT when VCC drops below VSW |
Key Features
| Feature | Design Value |
|---|---|
| Precision Fixed Reset Threshold | 2.85V–3.00V range (S-suffix) with ±15mV tolerance - eliminates external resistor divider while meeting 3.3V ±10% supply monitoring requirements |
| Backup-Battery Switchover | VBATT > VCC supported (up to 3.6V) - enables long-term data retention in portable systems without overvoltage risk to VCC rail |
| Chip-Enable Gating | ≤7ns CE IN-to-CE OUT propagation delay - prevents spurious writes to CMOS RAM during power transients without adding timing margin |
| Guaranteed Reset Assertion to VCC = 1V | Valid reset signal maintained even during deep brownout - ensures µP remains held in reset until stable supply resumes |
| Low Quiescent Current | 35µA typical VCC supply current - extends battery life in always-on backup configurations |
Applications
| Portable Medical Monitors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retaining real-time sensor data during AC power loss. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET and switching OUT to BATT to maintain RAM contents and clock domain integrity. Use Value: Prevents data corruption during 100ms–500ms AC dropout by guaranteeing 200ms reset hold and seamless 3.6V Li-cell switchover. |
Use Scenario: Remote environmental sensor node logging temperature/humidity to nonvolatile RAM across seasonal power interruptions. IC Role / Device Role / Timing Role: Power-monitoring supervisor triggering controlled shutdown and enabling battery-backed memory write completion. Use Value: CE gating blocks erroneous writes during VCC sag, while 2.85V reset threshold aligns precisely with 3.3V LDO dropout specification. |
| Smart Meter Communication Modules | Point-of-Sale Terminal Backups |
Use Scenario: PLC or RF communication module preserving firmware state and encryption keys during grid voltage sags. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 3.3V rail and provides PFI-based early warning of upstream supply collapse. Use Value: PFO output signals PFI < 1.24V 10–20ms before VCC crosses reset threshold, enabling preemptive secure state save. |
Use Scenario: Retail terminal maintaining transaction buffer and cryptographic session keys during brief UPS switchover delays. IC Role / Device Role / Timing Role: Compact supervisory IC delivering MR-initiated hard reset and guaranteed VCC=1V reset hold for fail-safe recovery. Use Value: 200ms tRP ensures full µP reset sequence completes before backup power depletes; 8-pin SO fits tight PCB layouts near µP. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SCSA+ | 16-pin SO package; includes LOWLINE, BATT OK, and watchdog outputs not present in MAX795SCSA+T | Required where early power-fail warning (NMI) or battery health monitoring is needed alongside reset | Select MAX793SCSA+ only if additional supervision features justify larger footprint and higher BOM cost |
| TPS3808G18DBVR | TI device with 1.8V fixed reset threshold, 360ms timeout, and no battery switchover or CE gating | Applicable only for pure reset supervision in 1.8V systems; lacks backup power management capability | Not functionally comparable - avoid for battery-backed 3.3V applications requiring VCC/BATT switchover |
Compared with MAX793SCSA+, MAX795SCSA+T offers identical reset accuracy and battery switching but in a smaller 8-pin SO package with reduced feature set - ideal for cost- and space-sensitive designs where LOWLINE, BATT OK, and watchdog functions are unnecessary.
Availability
MAX795SCSA+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, smart meter communication modules, and point-of-sale terminal backups requiring stable component supply and long-term lifecycle support.
Supply support for MAX795SCSA+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, computing, and communications markets.
The MAX795SCSA+T belongs to Maxim's microprocessor supervisory circuits product line, engineered specifically for reliable power monitoring and battery backup control in compact 3.0V/3.3V embedded systems.
FAQ
What is the exact reset threshold voltage range for MAX795SCSA+T?
The MAX795SCSA+T has an S-suffix designation, specifying a fixed reset threshold range of 2.85V to 3.00V (VCC falling). This is factory-trimmed and does not require external components. The threshold exhibits ±15mV tolerance over temperature and supply variations, ensuring robust operation in 3.3V ±10% systems. MAX795SCSA+T maintains guaranteed reset assertion down to VCC = 1V, independent of battery presence.
Does MAX795SCSA+T support backup-battery switchover, and what is the maximum VBATT voltage?
Yes, MAX795SCSA+T supports automatic backup-battery switchover via its internal p-channel MOSFET. When VCC falls below the battery switch threshold (VSW = 2.69V typ), OUT disconnects from VCC and connects to BATT. VBATT may exceed VCC - the absolute maximum rating is +6.0V, enabling safe use of standard 3.6V lithium coin cells. The switch exhibits low on-resistance (<160Ω at +25°C) to minimize voltage drop under load.
What is the function of the CE IN and CE OUT pins on MAX795SCSA+T?
CE IN and CE OUT implement a transmission-gate-based chip-enable signal gate. During normal operation (RESET inactive), CE IN passes directly to CE OUT with ≤7ns propagation delay. When RESET is asserted, the gate disables, forcing CE OUT high-impedance to prevent spurious writes to CMOS RAM. If CE IN is low at reset assertion, CE OUT remains low for ~10µs to complete the current memory cycle - a critical timing feature confirmed in the MAX795SCSA+T datasheet.
Is the MAX795SCSA+T pin-compatible with other devices in the MAX793/MAX794/MAX795 family?
No, MAX795SCSA+T is not pin-compatible with MAX793 or MAX794. It uses an 8-pin SO package with dedicated pins for OUT, VCC, GND, PFI, PFO, MR, RESET, and BATT. In contrast, MAX793/MAX794 use 16-pin packages and include additional pins for WDI, WDO, LOWLINE, BATT OK, and RESET IN - functions omitted in MAX795SCSA+T. Pin mapping and functionality differ fundamentally; PCB layout must be designed specifically for the 8-pin MAX795 footprint.
What are the key differences between MAX795SCSA+T and MAX795TCSA+T?
The suffix letter denotes the reset threshold range: 'S' in MAX795SCSA+T specifies 2.85V–3.00V, while 'T' in MAX795TCSA+T specifies 3.00V–3.15V. Both share identical 8-pin SO packaging, CE gating, battery switchover, and operating temperature (0°C to +70°C). The 'C' in both part numbers indicates commercial temperature grade, and '+' denotes lead-free RoHS-compliant packaging. Electrical performance, timing, and pinout are otherwise identical - selection depends solely on required reset voltage alignment with the host system's supply tolerance.
MAX795SCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX795SCSA+T FAQ
1.How can I place an order for MAX795SCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795SCSA+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 MAX795SCSA+T reliable?
The price and inventory of MAX795SCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795SCSA+T is usually 5 days.
3.What payment methods are accepted for MAX795SCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795SCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795SCSA+T?
MAX795SCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795SCSA+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 MAX795SCSA+T?
For technical support, including MAX795SCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795SCSA+T requirements.
6.How does Aetrix verify that MAX795SCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX795SCSA+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 MAX795SCSA+T meets industry standards.
7.What is the process for return or replacement of MAX795SCSA+T?
All MAX795SCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX795SCSA+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 MAX795SCSA+T part is unused and in its original packaging.
Return procedure for MAX795SCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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