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Analog Devices Inc./Maxim Integrated MAX703ESA
- Part No.:
- MAX703ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX703ESA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,534
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Product details
Overview
MAX703ESA from Maxim Integrated is a microprocessor supervisory circuit providing precision supply-voltage monitoring, battery-backup switching, power-fail warning, and manual reset in a single 8-pin SO package. It asserts an active-low RESET output when VCC drops below 4.65V, delivers 200ms reset pulse width, consumes only 200µA quiescent current, and supports CMOS RAM backup during brownout - used in industrial controllers and critical μP power monitoring systems.
For engineers reviewing the MAX703ESA datasheet, MAX703ESA pinout, MAX703ESA application, or MAX703ESA equivalent, key selection criteria include guaranteed RESET assertion down to VCC = 1V, 1.25V PFI threshold accuracy, battery switchover hysteresis of 40mV, and compatibility with lithium batteries (3.0–3.6V) and supercapacitor backup sources.
Technical Context
The MAX703ESA integrates four core functions: a precision voltage monitor with 4.65V reset threshold and 40mV hysteresis; a battery switchover circuit using p-channel MOSFETs (5Ω in VCC mode, 80Ω in VBATT mode); a 1.25V reference-based power-fail comparator with PFI/PFO interface; and a debounced TTL/CMOS-compatible manual reset input with 250µA internal pullup.
Its architecture ensures reliable reset assertion during power-up, brownout, and power-down events while maintaining valid RESET output even as VCC falls to 1V. In battery-backup mode, it disconnects VCC from VOUT, connects VBATT to VOUT, disables PFI/PFO functionality, and holds RESET low - all with <1µA supply current when VCC is >1V below VBATT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - guarantees reliable μP reset initiation before +5V supply dropout. |
| Reset Pulse Width | 140–280ms (typ. 200ms) - provides sufficient time for μP initialization and peripheral stabilization. |
| Quiescent Current | 200–500µA (E-grade) - enables low-power operation in always-on embedded systems. |
| Battery-Backup Current | 5.0µA max (over full temp range) - preserves battery life for years in static RAM retention applications. |
| PFI Threshold | 1.25V ±50mV - allows accurate power-fail warning or low-battery detection via external resistor divider. |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and extended-temperature embedded control environments. |
| Package | 8-pin SO (Small Outline) - surface-mount compatible with automated PCB assembly and space-constrained designs. |
Pinout & Package
MAX703ESA is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint, RoHS-compliant lead-free finish (denoted by "+" suffix), and thermal performance rated at 471mW at +70°C (derated 5.88mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC (via 5Ω p-MOSFET) and VBATT (via 80Ω p-MOSFET) based on reset threshold crossing and hysteresis. |
| 2 - VCC | +5V supply input | Primary power source; monitored for reset generation; powers internal circuitry unless in battery-backup mode. |
| 3 - GND | Ground reference | Common return path for all analog and digital functions; substrate connection point in normal operation. |
| 4 - PFI | Power-fail comparator input | Compares external voltage (e.g., unregulated DC) against 1.25V reference; triggers PFO low when input <1.25V. |
| 5 - PFO | Power-fail comparator output | Open-drain active-low output; disabled and forced low during battery-backup mode. |
| 6 - MR | Manual reset input | Active-low TTL/CMOS-compatible input with 250µA internal pullup; debounced by 200ms reset timer. |
| 7 - RESET | Reset output | Active-low open-drain output asserted during power-up, brownout, or MR activation; guaranteed functional down to VCC = 1V. |
| 8 - VBATT | Backup-battery input | Accepts 2.8–4.8V lithium or supercap source; enables automatic switchover to preserve RAM data during main supply failure. |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Threshold | 4.65V with ±150mV tolerance and 40mV hysteresis - prevents chatter during slow VCC decay and ensures deterministic reset timing. |
| Battery Switchover Control | Automatic, hysteresis-controlled switching between VCC and VBATT with <1µA standby current - extends battery life in long-term memory retention. |
| Power-Fail Warning Interface | Dedicated PFI/PFO pair with 1.25V reference - enables early system shutdown or state save before main supply collapse. |
| Guaranteed Low-Voltage RESET | RESET remains valid and sinks current down to VCC = 1V - ensures robust reset signaling even under severe brownout conditions. |
| Manual Reset Integration | MR input with internal 250µA pullup and 150ns pulse-width immunity - eliminates need for external pullup and simplifies pushbutton interface. |
Applications
| Industrial Controllers | Embedded Data Loggers |
|---|---|
Use Scenario: PLCs and remote I/O modules requiring uninterrupted RAM retention during AC mains interruption or battery-backed operation. IC Role / Device Role / Timing Role: Supervisory circuit providing VCC monitoring, automatic battery switchover to VOUT, and clean reset assertion to μP and peripherals. Use Value: Prevents data corruption during brownout by holding μP in reset and preserving SRAM contents via seamless VBATT-to-VOUT transition. | Use Scenario: Field-deployed environmental sensors logging temperature, pressure, or humidity to nonvolatile memory over months. IC Role / Device Role / Timing Role: Power supervisor enabling low-quiescent-current battery backup and power-fail interrupt generation via PFO to trigger emergency save routines. Use Value: Extends operational lifetime using 3.6V lithium coin cell with <5µA backup current, while PFI-triggered PFO interrupts ensure timely data preservation before supply collapse. |
| Medical Diagnostic Equipment | Test & Measurement Instruments |
Use Scenario: Portable ultrasound or ECG devices needing fail-safe boot sequence and persistent configuration storage across power cycles. IC Role / Device Role / Timing Role: μP reset generator with 200ms pulse width and guaranteed assertion down to VCC = 1V - ensures deterministic startup after battery insertion or charger disconnect. Use Value: Eliminates boot failures due to marginal VCC ramp rates; RESET remains active until stable supply is confirmed, preventing corrupted firmware execution. | Use Scenario: Benchtop oscilloscopes and multimeters retaining calibration coefficients and user settings during AC power loss. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors +5V rail for reset, and uses PFI to detect unregulated supply droop prior to regulated output collapse. Use Value: Enables preemptive state save via PFO interrupt - captures last valid measurement before power failure, improving instrument reliability and traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX704ESA | 4.40V reset threshold (vs. 4.65V), otherwise identical pinout, timing, and features | Suitable for systems with tighter +5V tolerance (±10%) or lower dropout margins | Select MAX704ESA when main supply nominal is 5.0V ±10% or when brownout detection must occur earlier in VCC decay. |
| MAX705CPA | No battery backup; adds watchdog timer and CE write-protect; 4.65V reset; 8-pin PDIP | Used where RAM backup is unnecessary but system-level fault recovery (watchdog timeout) is required | Choose MAX705CPA for cost-sensitive industrial μP systems needing watchdog supervision but no battery switchover capability. |
Compared with MAX704ESA, the MAX703ESA provides earlier reset assertion (4.65V vs. 4.40V), making it preferable for systems with looser supply tolerances; compared with MAX705CPA, it trades watchdog functionality for integrated battery backup - essential for SRAM retention but unsuitable where autonomous system recovery is prioritized.
Availability
MAX703ESA is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic equipment, and test & measurement instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX703ESA 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 high-performance analog and mixed-signal ICs for industrial, communications, computing, and consumer applications.
The MAX703/MAX704 product line delivers cost-effective, integrated supervisory solutions for μP-based systems requiring precise voltage monitoring, battery backup, and reliable reset generation - targeting applications where power integrity and data retention are mission-critical.
FAQ
What is the reset threshold voltage of the MAX703ESA?
The MAX703ESA has a nominal reset threshold voltage of 4.65V, with a guaranteed range of 4.50V to 4.75V across the full operating temperature range (-40°C to +85°C). This threshold determines when the active-low RESET output is asserted during power-up, brownout, or power-down events. The device also incorporates 40mV hysteresis to prevent oscillation near the trip point. This specification is fixed for the MAX703ESA and differs from the MAX704ESA (4.40V).
Does the MAX703ESA support battery backup for CMOS RAM?
Yes, the MAX703ESA provides integrated battery-backup switching for CMOS RAM. When VCC falls below the 4.65V reset threshold, the device automatically connects VBATT to VOUT through an 80Ω p-channel MOSFET switch - provided VBATT exceeds VCC by at least 20mV. In this mode, quiescent current drops to ≤5.0µA over temperature, enabling multi-year operation from a 3.6V lithium coin cell. The MAX703ESA datasheet confirms this function is fully implemented in the MAX703ESA variant.
What is the minimum VCC voltage at which RESET remains valid on the MAX703ESA?
The MAX703ESA guarantees RESET assertion and sink capability down to VCC = 1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1V, RESET becomes high-impedance and no longer actively pulls low. This feature ensures robust reset signaling during deep brownout conditions. For designs requiring RESET validity below 1V, external pulldown resistors (e.g., 100kΩ to GND) are recommended - a practice validated in the MAX703ESA application notes.
Can the MAX703ESA monitor a negative supply voltage?
Yes, the MAX703ESA's PFI input can be configured to monitor a negative supply using an external resistor network as shown in Figure 8 of the MAX703/MAX704 datasheet. By referencing PFI to ground and applying the negative rail through a voltage divider, the 1.25V internal comparator threshold detects droop in the negative supply. When the divided voltage at PFI rises above 1.25V (indicating negative rail magnitude decrease), PFO goes low. This technique is explicitly documented for the MAX703ESA family and requires no modification to the MAX703ESA itself.
What package type and RoHS status does the MAX703ESA use?
The MAX703ESA is supplied in an 8-pin SO (Small Outline) package per JEDEC MS-012AC outline, with lead(Pb)-free finish indicated by the "+" suffix in the ordering code. Its land pattern is documented as 90-0096, and thermal dissipation is rated at 471mW at +70°C (derated 5.88mW/°C above). This RoHS-compliant package is suitable for reflow soldering and meets IPC-7351B Class B standards - confirmed in the official Maxim Integrated package documentation for MAX703ESA.
MAX703ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-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:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX703ESA FAQ
1.How can I place an order for MAX703ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX703ESA 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 MAX703ESA reliable?
The price and inventory of MAX703ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX703ESA is usually 5 days.
3.What payment methods are accepted for MAX703ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX703ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX703ESA?
MAX703ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX703ESA 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 MAX703ESA?
For technical support, including MAX703ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX703ESA requirements.
6.How does Aetrix verify that MAX703ESA is sourced from the original manufacturer or authorized distributors?
All MAX703ESA 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 MAX703ESA meets industry standards.
7.What is the process for return or replacement of MAX703ESA?
All MAX703ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX703ESA, 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 MAX703ESA part is unused and in its original packaging.
Return procedure for MAX703ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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