My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX795SEPA+
- Part No.:
- MAX795SEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX795SEPA+.pdf
- Description:
- IC SUPERVISOR MPU 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,236
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX795SEPA+ from Maxim Integrated is an 8-pin microprocessor supervisory circuit designed for 3.0V/3.3V systems, providing precision reset generation (2.85V–3.00V threshold), backup-battery switchover, chip-enable gating with ≤7ns propagation delay, and low-line early-warning output. It ensures reliable µP startup/shutdown in battery-backed embedded controllers and portable equipment.
For engineers reviewing the MAX795SEPA+ datasheet, MAX795SEPA+ pinout, MAX795SEPA+ application, or MAX795SEPA+ equivalent, key selection criteria include its fixed S-suffix reset threshold (2.85V–3.00V), guaranteed reset assertion down to VCC = 1V, battery-switching capability with VBATT > VCC support, and integrated CE signal gating for CMOS RAM protection during undervoltage events.
Technical Context
The MAX795SEPA+ implements a precision voltage-monitoring comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions, and asserts active-low RESET for ≥200ms after VCC rises above the 2.85V–3.00V threshold. Its backup-battery switch uses internal p-channel MOSFETs with VCC-to-OUT on-resistance of 40Ω (typ) at +25°C and 3.3V VCC.
Unlike the MAX793/MAX794, the MAX795SEPA+ omits watchdog timer, manual reset input (MR), battery OK output, and power-fail comparator - confirmed by pin count reduction (8-pin vs. 16-pin), absence of WDI/WDO/PFI/BATT OK pins in its pinout, and explicit family differentiation in the Selector Guide and Pin Description table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V to 3.00V (S-suffix); guarantees reset assertion before VCC falls below 2.85V in 3.3V ±10% systems |
| Reset Timeout Period | 200ms minimum; ensures µP remains held in reset long enough for stable clock and supply settling |
| VCC Operating Range | 3.02V to 5.5V; supports operation across full 3.3V rail tolerance and 5V auxiliary supplies |
| Battery Switch Threshold | VCC falling: 2.69V (typ); enables seamless switchover to backup battery before system brownout |
| CE IN-to-CE OUT Delay | ≤7ns max; preserves timing integrity for high-speed µP address/data bus gating during undervoltage |
| Supply Current (VCC) | 32µA to 45µA (typ); ultra-low quiescent current extends battery life in always-on backup mode |
| Package | 8-pin plastic DIP; through-hole mounting compatible with legacy industrial PCB assembly |
Pinout & Package
MAX795SEPA+ is housed in an 8-pin plastic DIP package (0.300" wide), with 0.100" lead pitch and standard through-hole footprint. Pin 1 is marked with a dot or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT; connects to VCC when VCC > reset threshold, to BATT when VCC < 2.69V |
| 2 VCC | Main supply input | Primary 3.0V/3.3V system rail; powers internal comparators and logic; valid range 3.02V–5.5V |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance connection |
| 4 PFI | Power-fail comparator input | Monitors external voltage; when pulled below 1.212V, forces PFO low to indicate impending supply loss |
| 5 PFO | Power-fail comparator output | Open-drain active-low flag; used for NMI generation or battery freshness seal enable |
| 6 CE IN | Chip-enable input | Accepts µP's CE signal; gated internally to prevent RAM corruption during undervoltage |
| 7 CE OUT | Chip-enable output | Drives RAM CE pin; disabled during reset; 7ns max propagation delay preserves bus timing |
| 8 BATT | Backup-battery input | Accepts 3.6V lithium cell; voltage may exceed VCC; internal leakage <1µA at 5.5V VCC |
Key Features
| Feature | Design Value |
|---|---|
| Precision reset monitoring | Fixed 2.85V–3.00V trip point with 10mV hysteresis prevents chatter during slow VCC ramps |
| Backup-battery switchover | VBATT up to 6.0V supported; automatic transition at 2.69V (VCC falling) with no external components |
| Chip-enable gating | 7ns max CE IN-to-CE OUT delay enables use with fast µPs; disables CE path during reset to block invalid writes |
| Low-line early warning | LOWLINE output (pin 14 on MAX793/794) omitted; MAX795SEPA+ relies on PFI/PFO for programmable fail detection |
| Guaranteed reset to 1V | RESET asserted even as VCC drops to 1.0V, ensuring µP remains halted through deep brownout |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter requiring nonvolatile RAM retention and safe shutdown during main supply loss. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, battery switchover to preserve RAM state, and CE gating to prevent corrupted memory writes during power transition. Use Value: Enables 10+ year data retention using 3.6V lithium coin cell without external FETs or timing circuits. | Use Scenario: DIN-rail mounted PLC module operating in harsh environments with fluctuating 3.3V DC input. IC Role / Device Role / Timing Role: Reset supervisor ensuring deterministic µP boot after line interruption and preventing spurious writes to configuration EEPROM during undervoltage. Use Value: Eliminates need for discrete reset IC + external MOSFET switch; reduces BOM count by 3 components. |
| Smart Utility Meters | Ruggedized Handheld Terminals |
Use Scenario: AMI meter with tamper-detection logic and timekeeping SRAM backed by primary battery. IC Role / Device Role / Timing Role: Voltage supervisor asserting reset on VCC dip, enabling clean restart while maintaining real-time clock and metering registers via battery-backed OUT rail. Use Value: Guarantees 200ms reset pulse duration independent of VCC ramp rate, meeting ANSI C12.1 compliance for meter reset behavior. | Use Scenario: Field service terminal with flash memory and battery-backed RAM used in warehouse logistics. IC Role / Device Role / Timing Role: Power management IC providing CE signal blanking during brownout to avoid partial sector writes to NAND flash. Use Value: Prevents flash corruption by disabling CE within 7ns of reset assertion - faster than typical µP bus cycle times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX795TEPA+ | Higher reset threshold (3.00V–3.15V T-suffix); identical pinout, package, and feature set | Suitable for tighter-tolerance 3.3V systems where brownout must occur only below 3.00V | Select MAX795TEPA+ when system VCC regulation is ±3% and reset must not trigger above 3.00V |
| TPS3808G18DBVR | TI part with 1.8V reset threshold, different pinout (6-pin SOT-23), no battery switchover or CE gating | Limited to single-rail monitoring; requires external circuitry for battery backup or memory protection | Choose only if replacing MAX795SEPA+ in non-battery-backed designs with strict board space constraints |
Compared with MAX795TEPA+, the MAX795SEPA+ triggers reset earlier (at 2.85V vs. 3.00V), improving brownout resilience in marginally regulated 3.3V rails; versus TPS3808G18DBVR, it delivers integrated battery switching and CE gating - eliminating four external components and enabling true RAM-safe power fail response.
Availability
MAX795SEPA+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart utility meters, and ruggedized handheld terminals requiring stable component supply and long-term obsolescence management.
Supply support for MAX795SEPA+ 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 communications applications.
The MAX793/MAX794/MAX795 product line delivers integrated microprocessor supervision with battery backup, reset, and memory protection - engineered specifically for reliability-critical embedded systems operating from 3.0V/3.3V rails.
FAQ
What is the exact reset threshold voltage range for MAX795SEPA+?
The MAX795SEPA+ has an S-suffix reset threshold of 2.85V to 3.00V (VCC falling), with 10mV typical hysteresis. This is factory-trimmed and specified over temperature (–40°C to +85°C). The threshold is fixed and not adjustable - unlike the MAX794, which uses an external resistor divider. This range is optimized for 3.3V ±10% power supplies.
Does MAX795SEPA+ include a watchdog timer function?
No, the MAX795SEPA+ does not include a watchdog timer. Watchdog functionality (WDI/WDO pins and 1.6s timeout) is exclusive to the MAX793 and MAX794 variants, as confirmed by the Selector Guide, pin count (8-pin vs. 16-pin), and absence of WDI/WDO in the MAX795 pin description. The MAX795SEPA+ focuses on core supervision: reset, battery switchover, and CE gating.
Can MAX795SEPA+ support a 3.6V lithium battery with a 3.3V VCC rail?
Yes, MAX795SEPA+ explicitly supports VBATT > VCC: its absolute maximum VBATT rating is +6.0V, and the datasheet confirms "backup-battery voltage can exceed VCC, permitting the use of 3.6V lithium batteries in systems using 3.0V to 3.3V for VCC." Internal leakage remains <1µA, and battery switch threshold is 2.69V (typ) during VCC fall.
What is the purpose of the PFI and PFO pins on MAX795SEPA+?
On MAX795SEPA+, PFI (Pin 4) is a dedicated input for external voltage monitoring, and PFO (Pin 5) is its open-drain output. When PFI falls below 1.212V (typ), PFO pulls low - enabling early power-fail warnings or battery freshness seal activation. Unlike the MAX793/MAX794, MAX795SEPA+ lacks LOWLINE and BATT OK outputs, making PFI/PFO its primary programmable fail-detection interface.
Is MAX795SEPA+ pin-compatible with other MAX795 variants like MAX795TEPA+?
Yes, MAX795SEPA+ is fully pin-compatible with all MAX795 variants (T-, R-, and S-suffix) in the same 8-pin DIP or SO package. The suffix denotes only the reset threshold voltage range - all electrical characteristics, pin functions, timing, and package dimensions are identical. No PCB redesign is needed when substituting between MAX795TEPA+, MAX795SEPA+, or MAX795REPA+.
MAX795SEPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX795SEPA+ FAQ
1.How can I place an order for MAX795SEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX795SEPA+ 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 MAX795SEPA+ reliable?
The price and inventory of MAX795SEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX795SEPA+ is usually 5 days.
3.What payment methods are accepted for MAX795SEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX795SEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX795SEPA+?
MAX795SEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX795SEPA+ 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 MAX795SEPA+?
For technical support, including MAX795SEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX795SEPA+ requirements.
6.How does Aetrix verify that MAX795SEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX795SEPA+ 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 MAX795SEPA+ meets industry standards.
7.What is the process for return or replacement of MAX795SEPA+?
All MAX795SEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX795SEPA+, 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 MAX795SEPA+ part is unused and in its original packaging.
Return procedure for MAX795SEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX795SEPA+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
