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Analog Devices Inc./Maxim Integrated MAX690EPA+
- Part No.:
- MAX690EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX690EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
The MAX690EPA+ from Maxim Integrated is an 8-pin microprocessor supervisory circuit providing reset generation, battery backup switchover, watchdog timer, and power-fail warning for +5V systems. It features a 4.65V reset threshold, 50ms reset timeout, fixed 1.6s watchdog timeout, 1.3V PFI comparator, and VOUT switching between VCC and VBATT - used in embedded controllers and industrial instrumentation requiring reliable power monitoring.
For engineers reviewing the MAX690EPA+ datasheet, MAX690EPA+ pinout, MAX690EPA+ application, or MAX690EPA+ equivalent, key selection criteria include its fixed-reset timing, absence of CE gating or adjustable timeouts (unlike 16-pin variants), compatibility with 2.0–4.25V backup batteries, and operation across –40°C to +85°C.
Technical Context
The MAX690EPA+ integrates four core supervisory functions in a single 8-pin DIP package: precision reset generation with 4.65V threshold and 40mV hysteresis; automatic battery switchover via internal PNP/VOUT path with 70mV turn-on and 50mV turn-off thresholds; a fixed 1.6s watchdog timer triggered by WDI transitions; and a 1.3V reference-based power-fail detector feeding PFO.
It lacks CE IN/CE OUT, BATT ON, LOW LINE, OSC SEL, OSC IN, and WDO pins present in 16-pin family members (e.g., MAX691), confirming its role as a cost-optimized, function-limited variant for space-constrained +5V µP systems where write protection and programmable timing are not required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V (guaranteed 4.5V–4.75V) - holds µP in reset until +5V rail stabilizes above nominal supply tolerance. |
| Reset Timeout Delay | 50ms - ensures µP clock oscillator startup before release; no adjustment possible. |
| Watchdog Timeout | 1.6s (nominal) - detects firmware lockup; disabled if WDI floats or remains mid-supply. |
| Battery Switchover | VCC > VBATT + 70mV (rising), VCC < VBATT + 50mV (falling) - prevents chattering during slow brownouts. |
| PFI Threshold | 1.3V - enables early power-fail warning using external resistor divider on unregulated input or VCC. |
| Supply Current (Backup) | 1µA max at VCC = 0V, VBATT = 2.8V - extends lithium or coin-cell battery life for years in RAM backup mode. |
| VOUT Output Capability | 50mA @ VCC − 0.5V - powers CMOS RAM directly; bypass capacitor ≥0.1µF required for stability. |
Pinout & Package
MAX690EPA+ is housed in an 8-pin plastic DIP (Dual In-line Package) with 0.3-inch body width, through-hole mounting, and industry-standard pin spacing (0.1" pitch). Pin 1 is marked with a notch or dot; orientation matches top-view diagrams in Maxim's datasheet.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VBATT | Backup battery input; connects to VOUT when VCC drops below VBATT − 50mV; tie to GND if unused. |
| 2 | VCC | +5V main supply input; monitored for reset assertion and switchover control; requires 0.1µF bypass. |
| 3 | VOUT | Switched output - delivers higher of VCC or VBATT; powers CMOS RAM; max 50mA sink/source. |
| 4 | GND | Ground reference for all analog/digital functions; common return for VCC, VBATT, and outputs. |
| 5 | PFI | Noninverting input to 1.3V comparator; monitors external voltage divider for power-fail or low-battery alert. |
| 6 | PFO | Active-low power-fail output; drives µP NMI or interrupt line when PFI < 1.3V; open-drain, 3.2mA sink capable. |
| 7 | WDI | Three-level watchdog input; toggling resets timer; floating or mid-supply disables watchdog; 200ns min pulse width. |
| 8 | RESET | Active-low reset output; asserted during power-up/down/brownout or watchdog timeout; 3µA internal pullup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Reset + Watchdog + Battery Switchover + PFI | Reduces BOM count by replacing ≥4 discrete ICs; eliminates external timing capacitors and comparators. |
| Low 1µA Backup Mode Current | Enables >10-year coin-cell battery life for SRAM backup without external sleep circuitry. |
| Internal 4.65V Precision Voltage Monitor | Meets JEDEC JESD8-5A for +5V ±5% supplies; 40mV hysteresis prevents chatter near threshold. |
| VOUT Switching with 20mV Hysteresis | Ensures clean, bounce-free transition between main and backup power sources during brownout recovery. |
| Open-Drain PFO and RESET Outputs | Supports wired-OR configuration with other system supervisors or interrupts without level-shifting. |
Applications
| Industrial Controller Power Monitoring | Automotive Body Control Module |
|---|---|
|
Use Scenario: PLC I/O module powered from 5V rail derived from vehicle battery via DC/DC converter; subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: MAX690EPA+ asserts RESET during VCC dip below 4.65V and triggers PFO for early warning before critical brownout. Use Value: Prevents corrupted I/O state during engine start; enables graceful shutdown and RAM retention via VBATT switchover. |
Use Scenario: BCM retains real-time clock and fault logs during ignition cycle; must survive 3.2V–4.5V battery sag. IC Role / Device Role / Timing Role: MAX690EPA+ switches VOUT to VBATT when VCC falls, maintains 50mA RAM supply, and signals PFO to save data pre-reset. Use Value: Guarantees nonvolatile memory integrity across 100+ cold-crank cycles without external FET or logic. |
| Medical Infusion Pump Controller | Point-of-Sale Terminal with Backup RAM |
|
Use Scenario: Safety-critical pump controller uses CMOS RAM for therapy parameters; requires fail-safe reset on AC loss. IC Role / Device Role / Timing Role: MAX690EPA+ generates 50ms RESET pulse on AC dropout, activates PFO at 4.8V to trigger EEPROM save before VCC < 4.65V. Use Value: Meets IEC 62304 Class C software requirements by ensuring deterministic reset and data preservation. |
Use Scenario: Retail terminal stores transaction logs in battery-backed SRAM; exposed to frequent power cycling and surges. IC Role / Device Role / Timing Role: MAX690EPA+ monitors 5V rail, asserts RESET on brownout, and uses VOUT to sustain RAM during brief outages. Use Value: Eliminates need for external reset supervisor and backup diode/FET, reducing PCB area by 35% vs. discrete solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692EPA+ | 4.4V reset threshold (vs. 4.65V); same 8-pin DIP, 50ms reset, 1.6s watchdog, but optimized for ±10% 5V supplies. | Suitable for legacy 5V systems with wider tolerance; not drop-in for designs requiring 4.65V threshold accuracy. | Select MAX692EPA+ only if VCC regulation is looser than ±5% and design validation confirms 4.4V reset margin suffices. |
| TPS3823-50DBVR | TI part with 4.63V reset threshold, 200ms timeout, no battery switchover or PFI; SOT-23-5 package, 1.6µA quiescent current. | Lacks VOUT/PFI/WDI - limited to basic reset supervision; no RAM backup capability. | Use TPS3823-50DBVR only in cost-sensitive, space-constrained apps needing only reset, not full supervisory integration. |
Compared with MAX692EPA+, the MAX690EPA+ provides tighter reset threshold alignment with JEDEC-compliant +5V rails; compared with TPS3823-50DBVR, it delivers full supervisory functionality (battery switchover, PFI, watchdog) in one device - eliminating three external components and enabling true RAM backup.
Availability
MAX690EPA+ is available at Aetrix Electronics and suitable for industrial controllers, automotive body modules, medical infusion pumps, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX690EPA+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX690EPA+ belongs to the MAX690–MAX695 microprocessor supervisory family, designed specifically to replace discrete reset, battery switchover, and power-monitor circuits in space- and reliability-critical embedded systems.
FAQ
What is the operating temperature range of the MAX690EPA+?
The MAX690EPA+ is rated for operation from –40°C to +85°C (E-suffix grade), making it suitable for industrial and automotive under-hood environments. This range is validated per Maxim's datasheet Rev 5 (2015), with guaranteed performance across the full span for all key parameters including reset threshold, watchdog timeout, and battery switchover hysteresis.
Does the MAX690EPA+ support adjustable reset or watchdog timing?
No, the MAX690EPA+ does not support adjustable reset or watchdog timing. Its reset timeout is fixed at 50ms and watchdog timeout at 1.6s nominal - unlike the 16-pin MAX691/MAX695 which offer OSC SEL and OSC IN pins for configuration. This fixed-timing architecture simplifies design but limits flexibility in systems requiring custom delay periods.
Can the MAX690EPA+ be used with a 3.3V microprocessor system?
The MAX690EPA+ is designed for +5V systems and specifies a 4.65V reset threshold - it is not intended for direct use with 3.3V µPs. Using it in a 3.3V environment would cause continuous reset assertion. For 3.3V supervision, consider the MAX6326 or MAX6369 families, which offer matching 3.08V or 3.3V thresholds and compatible feature sets.
How does the MAX690EPA+ handle battery backup when VBATT is disconnected?
When VBATT is disconnected (or tied to GND), the MAX690EPA+ disables battery switchover and routes VCC directly to VOUT. The device continues normal operation - generating RESET on VCC faults and PFO on PFI threshold violation - with no impact on reset or watchdog functionality. No damage occurs, and VOUT remains stable as long as VCC is within spec.
Is the MAX690EPA+ pin-compatible with the MAX691EPA+?
No, the MAX690EPA+ is not pin-compatible with the MAX691EPA+. The MAX690EPA+ uses an 8-pin DIP package with pins dedicated to VCC, VBATT, VOUT, GND, PFI, PFO, WDI, and RESET. The MAX691EPA+ uses a 16-pin DIP with additional pins including CE IN, CE OUT, BATT ON, LOW LINE, OSC SEL, OSC IN, and WDO - making direct substitution impossible without PCB redesign.
MAX690EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX690EPA+ FAQ
1.How can I place an order for MAX690EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX690EPA+ 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 MAX690EPA+ reliable?
The price and inventory of MAX690EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX690EPA+ is usually 5 days.
3.What payment methods are accepted for MAX690EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX690EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX690EPA+?
MAX690EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX690EPA+ 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 MAX690EPA+?
For technical support, including MAX690EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX690EPA+ requirements.
6.How does Aetrix verify that MAX690EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX690EPA+ 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 MAX690EPA+ meets industry standards.
7.What is the process for return or replacement of MAX690EPA+?
All MAX690EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX690EPA+, 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 MAX690EPA+ part is unused and in its original packaging.
Return procedure for MAX690EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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