My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX709LESA+T
- Part No.:
- MAX709LESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709LESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,333
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX709LESA+T from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +5V systems requiring 4.65V reset threshold, 140ms minimum reset timeout, and operation down to VCC = 1V. It eliminates external components in microprocessor supervisory circuits and supports SO-8 packaging for space-constrained industrial and embedded applications.
For engineers reviewing the MAX709LESA+T datasheet, MAX709LESA+T pinout, MAX709LESA+T application, or MAX709LESA+T equivalent, key selection criteria include guaranteed reset assertion at VCC ≥ 1V, immunity to sub-40µs negative VCC transients, precise 4.65V threshold tolerance (±0.15V), and compatibility with 3.3V/5V µP reset inputs.
Technical Context
The MAX709LESA+T integrates a precision voltage comparator with hysteresis and an internal timer to generate a clean, glitch-immune reset pulse. Its reset threshold is factory-trimmed to 4.65V (L-suffix) with ±0.15V accuracy over −40°C to +85°C, and it guarantees correct RESET state down to VCC = 1V.
It features a fixed 140ms minimum reset timeout after VCC rises above threshold, no external timing components required, and immunity to short negative VCC transients - up to 40µs duration when overdrive is ≤100mV below threshold - enabling robust operation in noisy power environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V nominal (L-suffix), ±0.15V tolerance over full temperature range - ensures reliable brownout detection in +5V systems |
| Reset Timeout | 140ms min after VCC rise - meets µP power-on reset timing requirements without external RC network |
| Supply Range | 1.0V to 5.5V - guarantees valid RESET output even during deep brownout or partial power loss |
| Supply Current | 65µA typical at VCC = 5.5V - enables low-power system monitoring without burdening supply rails |
| Output Drive | Sink capability: 1.2mA at VCC = reset threshold min - directly drives standard CMOS/TTL reset inputs |
| Transient Immunity | Immune to negative VCC glitches ≤40µs at 100mV overdrive - prevents false resets in electrically noisy environments |
| Operating Temp | −40°C to +85°C (E-grade) - qualified for industrial and automotive under-hood applications |
Pinout & Package
MAX709LESA+T is supplied in an 8-pin SO (Small Outline) package with lead-free finish (+T suffix). Pin 1 is top-left corner (notch-marked), pin numbering follows standard SO-8 counterclockwise convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | No internal connection - must be left floating or tied to GND per layout best practice |
| 2 | VCC | Main supply input (1.0–5.5V); requires 0.1µF bypass capacitor placed adjacent to pin for transient immunity |
| 3 | GND | Analog/digital ground reference - must connect to system ground plane with low-inductance path |
| 4 | No Connect | No internal connection - must be left floating or tied to GND |
| 5 | No Connect | No internal connection - must be left floating or tied to GND |
| 6 | No Connect | No internal connection - must be left floating or tied to GND |
| 7 | RESET | Active-low open-drain reset output - sinks current to hold µP in reset; requires external pull-up for logic-high state |
| 8 | No Connect | No internal connection - must be left floating or tied to GND |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65V Reset Threshold | Factory-trimmed comparator with ±0.15V accuracy across −40°C to +85°C - eliminates manual calibration and external resistive dividers |
| 140ms Fixed Reset Timeout | Internally timed delay ensures µP remains held in reset long enough for stable clock and supply settling - no external capacitor needed |
| VCC = 1V Minimum Operation | Guaranteed RESET assertion state maintained down to 1V supply - enables fail-safe reset during deep brownout conditions |
| SO-8 Lead-Free Package | RoHS-compliant 8-pin SOIC with +T suffix - supports automated SMT assembly and industrial thermal cycling reliability |
| Glitch Immunity | Rejects negative VCC transients ≤40µs at 100mV overdrive - prevents spurious resets in motor-driven or switching regulator environments |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power sequencing and brownout protection in programmable logic controllers operating in factory-floor environments with fluctuating 24VDC-derived 5V rails. IC Role / Device Role / Timing Role: Supervisory reset generator ensuring deterministic µP startup and safe shutdown during line sags or EMI-induced dips. Use Value: Prevents firmware corruption by guaranteeing 140ms reset hold time and asserting reset down to VCC = 1V - critical for nonvolatile memory integrity. | Use Scenario: Embedded control subsystem in portable ultrasound or patient monitor where battery-backed 5V supplies experience rapid load transients. IC Role / Device Role / Timing Role: Primary power-fail detector interfacing directly to ARM Cortex-M4 reset pin with open-drain output and pull-up. Use Value: Eliminates need for discrete resistor divider and RC timing network - reduces BOM count and PCB area while maintaining ±0.15V threshold accuracy. |
| Automotive Body Control Module | Point-of-Sale Terminal |
Use Scenario: Reset supervision for microcontrollers in BCMs exposed to cold-crank (4.5V) and load-dump (up to 18V) conditions on 5V LDO outputs. IC Role / Device Role / Timing Role: Brownout detector with high noise immunity - suppresses false resets caused by alternator ripple or relay switching spikes. Use Value: 40µs glitch rejection at 100mV overdrive ensures reset remains asserted only during true undervoltage events - improves system uptime. | Use Scenario: Compact retail terminal using single 5V rail for CPU, display, and peripheral interfaces with strict FCC Class B emissions limits. IC Role / Device Role / Timing Role: Low-quiescent-current (65µA) supervisor minimizing standby power draw while maintaining full reset functionality. Use Value: Enables >10-year battery backup life in tamper-evident logging mode - critical for PCI-DSS compliance and audit trail integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706PESA+ | Same SO-8 package, identical 4.65V threshold and 140ms timeout, but rated for 0°C to +70°C (C-grade) instead of −40°C to +85°C (E-grade) | Limited to commercial-temperature applications; not suitable for extended industrial or automotive ambient ranges | Select MAX706PESA+ only if operating temperature stays within 0°C–70°C and cost sensitivity outweighs thermal margin needs |
| TPS3808G33DBVR | Texas Instruments part with 3.3V reset threshold, adjustable timeout (200ms default), higher quiescent current (1.1µA), and different pinout (RESET active-high, VCC/GND swapped) | Requires board redesign due to active-high output and incompatible pin mapping; intended for 3.3V systems, not 5V | Choose TPS3808G33DBVR only when migrating to 3.3V µP architecture and redesigning reset interface logic |
Compared with MAX706PESA+, MAX709LESA+T provides extended temperature qualification and identical electrical performance; compared with TPS3808G33DBVR, MAX709LESA+T offers direct 5V-system compatibility, lower supply current, and proven noise immunity - making it optimal for drop-in replacement in legacy +5V designs.
Availability
MAX709LESA+T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive body electronics, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX709LESA+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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX709 belongs to Maxim's µP supervisory circuit product line, engineered specifically to replace discrete reset solutions in microprocessor-based systems with guaranteed timing, precision thresholds, and robust noise immunity.
FAQ
What is the exact reset threshold voltage of the MAX709LESA+T?
The MAX709LESA+T has a nominal reset threshold voltage of 4.65V, with a guaranteed tolerance of ±0.15V over the full operating temperature range (−40°C to +85°C). This value is factory-trimmed and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix L. The MAX709LESA+T does not require external calibration or resistor networks to achieve this accuracy.
Does the MAX709LESA+T require an external pull-up resistor on the RESET pin?
Yes, the MAX709LESA+T features an open-drain RESET output and requires an external pull-up resistor to VCC (typically 10kΩ–100kΩ) to establish a valid logic-high state when not actively asserting reset. Without this pull-up, the RESET line floats and cannot drive µP reset inputs reliably. The datasheet confirms this requirement in the "Pin Description" and "Applications Information" sections.
Can the MAX709LESA+T operate with a 3.3V supply?
No - the MAX709LESA+T is specifically configured for +5V systems with a 4.65V reset threshold. While its VCC range extends down to 1.0V, applying only 3.3V would cause the device to assert reset continuously because VCC remains below the 4.65V threshold. For 3.3V systems, use MAX709SESA+T (2.93V threshold) or MAX709TESA+T (3.08V threshold) instead.
What is the maximum negative VCC transient duration the MAX709LESA+T can ignore?
The MAX709LESA+T is immune to negative VCC transients up to 40µs in duration when the overdrive (VTH − VCC) is ≤100mV, as confirmed in Figure 1 and the "Applications Information" section. This immunity is specific to the L/M versions (4.65V/4.40V thresholds); R/S/T variants exhibit slightly different transient response curves.
Is the MAX709LESA+T pin-compatible with other MAX709 variants like MAX709TESA+T?
Yes - all MAX709 variants (L/M/R/S/T) share identical SO-8 pinouts, electrical interfaces, and functional behavior except for reset threshold voltage and supply current. The MAX709LESA+T, MAX709TESA+T, and MAX709SESA+T are mechanically and electrically interchangeable in the same footprint, enabling easy threshold tuning without PCB revision.
MAX709LESA+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:
- Simple Reset/Power-On Reset
- 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
MAX709LESA+T FAQ
1.How can I place an order for MAX709LESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709LESA+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 MAX709LESA+T reliable?
The price and inventory of MAX709LESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709LESA+T is usually 5 days.
3.What payment methods are accepted for MAX709LESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709LESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709LESA+T?
MAX709LESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709LESA+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 MAX709LESA+T?
For technical support, including MAX709LESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709LESA+T requirements.
6.How does Aetrix verify that MAX709LESA+T is sourced from the original manufacturer or authorized distributors?
All MAX709LESA+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 MAX709LESA+T meets industry standards.
7.What is the process for return or replacement of MAX709LESA+T?
All MAX709LESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX709LESA+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 MAX709LESA+T part is unused and in its original packaging.
Return procedure for MAX709LESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX709LESA+T 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…
