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Analog Devices Inc./Maxim Integrated MAX703CSA+TG068
- Part No.:
- MAX703CSA+TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX703CSA+TG068.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,126
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Product details
Overview
MAX703CSA+TG068 from Maxim Integrated is a microprocessor supervisory circuit designed for power-supply monitoring and battery-backup switching in +5V μP systems. It provides active-low reset assertion at 4.65V VCC threshold, 200ms reset pulse width, 200μA quiescent current, and automatic switchover to VBATT when VCC falls below reset level - used in embedded controllers requiring reliable power-fail detection and CMOS RAM retention.
For engineers reviewing the MAX703CSA+TG068 datasheet, MAX703CSA+TG068 pinout, MAX703CSA+TG068 application, or MAX703CSA+TG068 equivalent, key selection criteria include reset threshold accuracy (4.65V ±150mV), battery-switch hysteresis (40mV), PFI comparator reference (1.25V), guaranteed RESET assertion down to VCC = 1V, and SO-8 package compatibility with industrial temperature range (0°C to +70°C).
Technical Context
The MAX703CSA+TG068 integrates four core functions in a single SO-8 IC: precision supply-voltage monitoring with fixed 4.65V reset threshold, debounced TTL/CMOS-compatible manual reset input (MR), power-fail comparator with 1.25V internal reference (PFI/PFO), and bidirectional battery-backup switchover circuitry enabling seamless transition between VCC and VBATT to preserve RAM data during brownout.
Its internal architecture includes a p-channel MOSFET switch (5Ω on-resistance in VCC mode, 80Ω in battery mode), reset timer with 140–280ms pulse width, and substrate-controlled battery-backup mode activation that disables PFI/PFO/MR and forces RESET low when VCC drops below threshold and VBATT > VCC + 20mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V (min 4.50V, max 4.75V); ensures deterministic μP reset before +5V supply instability causes code corruption |
| Reset Pulse Width | 200ms typical (140–280ms); guarantees sufficient hold time for μP initialization after power-up or recovery |
| Supply Current | 200–350μA at VCC = 4.75–5.5V; enables low-power operation in always-on monitoring applications |
| Battery-Backup Current | 50nA typical at VCC = 0V, VBATT = 2.8V; extends lithium battery life beyond 10 years in standby |
| PFI Reference Voltage | 1.25V (±50mV); allows precise undervoltage detection of unregulated supplies via external resistor divider |
| VBATT Switch Hysteresis | 40mV; prevents oscillatory switchover during slow VCC decay near threshold |
| RESET Output Drive | VOL = 0.4V @ 3.2mA sink; compatible with TTL/CMOS inputs without external pull-up |
Pinout & Package
MAX703CSA+TG068 is housed in an 8-pin SO (Small Outline) package with gull-wing leads, RoHS-compliant lead(Pb)-free finish indicated by the "+" suffix, and JEDEC MS-012AC outline (S8+2 code). The package supports surface-mount reflow assembly and operates across 0°C to +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Switched output supply | Connects to CMOS RAM VDD; sourced from VCC (via 5Ω p-MOSFET) or VBATT (via 80Ω p-MOSFET) depending on power state |
| 2 - VCC | +5V main supply input | Primary power source; monitored for reset generation and used as substrate reference during normal operation |
| 3 - GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance for stable reset timing |
| 4 - PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V for early warning of supply collapse |
| 5 - PFO | Power-fail comparator output | Active-low open-drain interrupt signal; disabled and forced low during battery-backup mode |
| 6 - MR | Manual reset input | Active-low TTL/CMOS-compatible trigger; internally pulled up with 250μA current; debounced by reset timer |
| 7 - RESET | Reset output | Active-low push-pull output; asserted low during power-up, brownout, or MR activation; guaranteed valid down to VCC = 1V |
| 8 - VBATT | Battery backup input | Accepts 2.0–4.80V lithium cell; enables automatic switchover to preserve RAM when VCC fails |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.65V reset threshold | Guaranteed over full temperature range; eliminates need for external resistor network calibration |
| 200ms reset pulse width | Internally timed; ensures μP reset duration exceeds minimum requirement of most 8/16-bit processors |
| 50nA battery-backup quiescent current | Enables multi-year operation on coin-cell batteries without compromising RAM data retention |
| 1.25V precision PFI reference | Stable bandgap-derived voltage; supports accurate monitoring of auxiliary supplies or negative rails via resistor networks |
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout; prevents μP from executing undefined instructions |
Applications
| Industrial Controllers | Embedded Data Loggers |
|---|---|
Use Scenario: PLC I/O modules operating in factory environments with fluctuating 24VDC-derived +5V supplies. IC Role / Device Role / Timing Role: Supervisory circuit providing brownout reset and RAM backup during line sags or transient interruptions. Use Value: Prevents corrupted control logic execution and preserves last-known sensor states using onboard lithium battery. | Use Scenario: Battery-powered environmental monitors logging temperature/humidity at remote sites. IC Role / Device Role / Timing Role: Power supervisor asserting reset on main supply failure and enabling seamless switchover to backup supercapacitor. Use Value: Maintains real-time clock and buffer memory integrity during extended AC outages without firmware intervention. |
| Medical Diagnostic Devices | Point-of-Sale Terminals |
Use Scenario: Portable ultrasound units with dual power sources (AC adapter + Li-ion pack). IC Role / Device Role / Timing Role: Ensures deterministic μP reset during AC-to-battery transition and guards against spurious resets from EMI. Use Value: Eliminates risk of image buffer loss or calibration drift during power source handover. | Use Scenario: Retail terminals experiencing brief utility interruptions during peak transaction periods. IC Role / Device Role / Timing Role: Provides 200ms reset hold time and battery-backed SRAM retention for pending transaction records. Use Value: Guarantees transaction atomicity and audit trail continuity despite sub-second power dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX705CPA+ | No battery backup; includes watchdog timer and CE write-protect; 4.65V reset; SO-8 not available (PDIP only) | Suitable where RAM backup is unnecessary but system-level watchdog supervision is required | Select MAX705CPA+ if watchdog timeout (1.6s) and write-protect are needed, and PDIP packaging is acceptable |
| TPS3808G33DBVR | Adjustable reset threshold (via external resistor); no battery switchover; 3.3V supply; SOT-23-6 package | Designed for low-voltage microcontrollers; lacks PFI comparator and VBATT interface | Choose TPS3808G33DBVR for compact 3.3V systems without backup power requirements |
Compared with MAX705CPA+ and TPS3808G33DBVR, the MAX703CSA+TG068 uniquely combines fixed 4.65V reset, integrated battery switchover, and PFI-based power-fail warning in an SO-8 package - making it irreplaceable in cost-sensitive +5V systems requiring long-term RAM retention without external circuitry.
Availability
MAX703CSA+TG068 is available at Aetrix Electronics and suitable for industrial controllers, embedded data loggers, medical diagnostic devices, and point-of-sale terminals requiring stable component supply across commercial temperature range (0°C to +70°C) and long-lifecycle support.
Supply support for MAX703CSA+TG068 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, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX703CSA+TG068 belongs to Maxim's microprocessor supervisory product line, engineered specifically to replace discrete reset generators and backup diode networks in +5V μP systems while ensuring robust power-fail response and data retention.
FAQ
What is the exact reset threshold voltage for MAX703CSA+TG068?
The MAX703CSA+TG068 has a guaranteed reset threshold of 4.65V, with a specified tolerance of ±150mV (min 4.50V, max 4.75V) over the full operating temperature range (0°C to +70°C). This fixed threshold eliminates external component dependencies and ensures consistent reset behavior across all units of MAX703CSA+TG068 without calibration.
Does MAX703CSA+TG068 support battery backup for CMOS RAM?
Yes, MAX703CSA+TG068 provides integrated battery-backup switchover functionality. When VCC drops below the 4.65V reset threshold and VBATT exceeds VCC by at least 20mV, the device automatically connects VBATT to VOUT through an 80Ω p-channel MOSFET, preserving CMOS RAM contents. Quiescent current in this mode is as low as 50nA, enabling multi-year operation on standard lithium cells.
Can MAX703CSA+TG068 monitor non-+5V power supplies?
Yes, MAX703CSA+TG068 can monitor non-+5V supplies using its PFI input and 1.25V internal reference. By connecting an external resistor divider to PFI, users can scale any positive or negative supply voltage to fall within the 1.25V trip window - for example, detecting failure of a -12V rail or a 3.3V auxiliary supply. The PFI input draws less than 25nA, minimizing loading effects.
What is the function of the PFO pin on MAX703CSA+TG068?
The PFO (Power-Fail Output) pin on MAX703CSA+TG068 is an active-low, open-drain comparator output that goes low when the PFI input voltage falls below 1.25V. It serves as an early warning interrupt for impending supply collapse, allowing the μP to save critical data before reset occurs. During battery-backup mode, PFO is disabled and held low to prevent false interrupts.
Is MAX703CSA+TG068 pin-compatible with other MAX70x variants?
Yes, MAX703CSA+TG068 shares identical pinout and package (8-pin SO) with MAX704CSA+, MAX705CSA+, and MAX706CSA+. However, functional differences exist: MAX704CSA+ uses 4.40V reset threshold; MAX705/706 add watchdog timers and CE write-protect; MAX703CSA+TG068 remains unique in combining 4.65V reset, battery switchover, and PFI/PFO without watchdog.
MAX703CSA+TG068 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX703CSA+TG068 FAQ
1.How can I place an order for MAX703CSA+TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX703CSA+TG068 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 MAX703CSA+TG068 reliable?
The price and inventory of MAX703CSA+TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX703CSA+TG068 is usually 5 days.
3.What payment methods are accepted for MAX703CSA+TG068?
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4.How is shipping managed for MAX703CSA+TG068?
MAX703CSA+TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX703CSA+TG068 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 MAX703CSA+TG068?
For technical support, including MAX703CSA+TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX703CSA+TG068 requirements.
6.How does Aetrix verify that MAX703CSA+TG068 is sourced from the original manufacturer or authorized distributors?
All MAX703CSA+TG068 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 MAX703CSA+TG068 meets industry standards.
7.What is the process for return or replacement of MAX703CSA+TG068?
All MAX703CSA+TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX703CSA+TG068, 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 MAX703CSA+TG068 part is unused and in its original packaging.
Return procedure for MAX703CSA+TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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