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Analog Devices Inc./Maxim Integrated MAX968ESA
- Part No.:
- MAX968ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX968ESA.pdf
- Description:
- IC COMPARATOR 2 WINDW 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,069
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Product details
Overview
The MAX968ESA from Maxim Integrated is a dual micropower comparator with rail-to-rail inputs/outputs, 1.235V ±1.5% internal reference, programmable hysteresis, and 10µs propagation delay (50mV overdrive). It operates from +1.6V to +5.5V single supply and draws only 10–16µA total supply current across -40°C to +85°C. It is used in battery-powered voltage monitoring and window detection circuits.
For engineers reviewing the MAX968ESA datasheet, MAX968ESA pinout, MAX968ESA application, or MAX968ESA equivalent, key selection factors include its dual-channel configuration, integrated reference accuracy, hysteresis programmability via HYST pin, open-drain output compatibility with mixed-voltage systems, and SO-8 package suitability for space-constrained portable designs.
Technical Context
The MAX968ESA implements a dual-window comparator architecture using two matched comparators sharing a common 1.235V reference and HYST input. Its rail-to-rail input stage supports operation down to 1.6V supply while maintaining -0.25V to VCC common-mode range, enabling direct sensing of battery voltages near ground.
Each comparator features an open-drain output capable of sinking up to 10mA (typical) with VOL ≤ 0.4V at 500µA load, and the HYST pin allows precise ±1mV to ±50mV hysteresis programming using external resistors referenced to REF - a capability exclusive to MAX965/967/968/969 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.6V to +5.5V - enables direct operation from 2-cell alkaline or Li-ion batteries without regulation. |
| Total Supply Current | 10µA to 16µA (TA = -40°C to +85°C) - ultra-low power suitable for multi-year battery life in IoT sensors. |
| Reference Voltage | 1.235V ±1.5% (0°C to +85°C), ±2.5% (-40°C to +85°C) - stable trip-point generation without external precision reference. |
| Propagation Delay | 10µs (50mV overdrive) - sufficient speed for battery voltage monitoring and slow analog thresholding. |
| Input Offset Voltage | ≤6.0mV (-40°C to +85°C, µMAX package) - ensures reliable detection of small voltage deviations in low-power systems. |
| Hysteresis Programmability | ±1mV to ±50mV via HYST pin - eliminates external feedback networks and reduces component count in window-comparator designs. |
| Output Type | Open-drain - allows level translation to higher rails (up to 6V) and wired-OR logic for fault aggregation. |
Pinout & Package
The MAX968ESA is housed in an 8-pin SO (Small Outline) package (package code S8-2), with standard 1.27mm pitch and gull-wing leads compatible with automated PCB assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Open-drain output of Comparator A - requires external pull-up for logic-high assertion; sinks current when active. |
| 2 | VCC | Positive supply input (+1.6V to +5.5V) - powers both comparators and internal reference circuitry. |
| 3 | REF | 1.235V bandgap reference output - provides stable voltage source for threshold setting and hysteresis programming. |
| 4 | HYST | Hysteresis control input - accepts voltage from REF to (REF − 50mV); sets symmetric hysteresis band for both comparators. |
| 5 | INB− | Inverting input of Comparator B - used with INB+ to define lower threshold in window-comparator configuration. |
| 6 | INB+ | Noninverting input of Comparator B - paired with INB− to implement second comparison boundary. |
| 7 | GND | Analog ground reference - must be connected to system ground plane for accurate reference and offset performance. |
| 8 | OUTB | Open-drain output of Comparator B - independent of OUTA; enables dual-threshold flagging (e.g., under/over-voltage). |
Key Features
| Feature | Design Value |
|---|---|
| Dual window-comparator topology | Configured as high/low threshold detector using shared REF and HYST - eliminates need for external reference or dual-resistor dividers. |
| Rail-to-rail input common-mode range | -0.25V to VCC - enables direct monitoring of battery voltage from near-ground to full charge without level-shifting. |
| Programmable hysteresis via single HYST pin | Adjusts both comparators simultaneously with one resistor pair - simplifies PCB layout and improves matching vs. discrete hysteresis. |
| Ultra-low quiescent current | 10–16µA total - extends operational lifetime in coin-cell or energy-harvesting applications where average current < 1µA is critical. |
| Open-drain outputs with 6V tolerance | Supports pull-up to 5V/3.3V/2.5V rails - enables interface with mixed-voltage microcontrollers and logic families without translators. |
Applications
| Battery Voltage Window Monitor | Low-Power Threshold Discriminator |
|---|---|
|
Use Scenario: Monitoring 2-cell alkaline battery (2.0V–3.2V) to trigger shutdown before deep discharge. IC Role / Device Role / Timing Role: Dual comparator compares battery voltage against upper (e.g., 3.0V) and lower (e.g., 2.2V) thresholds derived from REF and HYST. Use Value: Prevents system brownout and battery damage using only 12µA total supply current and no external reference IC. |
Use Scenario: Detecting ambient light level crossing preset intensity threshold in solar-powered sensor node. IC Role / Device Role / Timing Role: Comparator A compares photodiode amplifier output to REF; HYST adds noise immunity against flicker-induced false triggers. Use Value: Eliminates need for ADC and firmware thresholding - reduces BOM cost and sleep-mode power by >50% vs. MCU-based solution. |
| Supply Rail Supervisor | Voltage-Level Translator |
|
Use Scenario: Validating 3.3V system rail integrity during cold-start in industrial controller. IC Role / Device Role / Timing Role: Uses REF as stable 1.235V reference; resistor divider scales 3.3V rail to ~1.235V for precise undervoltage lockout (UVLO). Use Value: Achieves ±1.5% UVLO accuracy over temperature without trimming, replacing discrete Zener + transistor supervisor. |
Use Scenario: Converting 1.8V logic signal to 5V-compatible output for legacy interface in portable medical device. IC Role / Device Role / Timing Role: IN+ driven by 1.8V signal; OUT pulled to 5V - open-drain output provides clean level shift without direction control. Use Value: Enables interoperability between ultra-low-voltage SoCs and 5V peripherals using single 8-pin SO package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator with reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3702IDR | No internal reference; requires external 1.2V reference; higher supply current (1.8µA per comparator); no hysteresis pin. | Suitable for general-purpose dual comparison but lacks integrated reference and programmable hysteresis - increases BOM count and layout complexity. | Choose when reference voltage must be user-selectable or when lower input offset (<2mV) is required over temperature. |
| MAX967ESA | Same package and pinout; identical reference and hysteresis architecture; differs only in internal routing - configured as dual voltage monitor (not window). | Used for independent high/low alerts (e.g., VCC OK + VBAT low) rather than bounded window detection. | Prefer MAX967ESA if thresholds are unrelated; choose MAX968ESA when upper/lower limits define a valid operating envelope. |
Compared with TLV3702IDR and MAX967ESA, the MAX968ESA uniquely integrates window-comparator functionality with programmable hysteresis and reference in an SO-8 package - reducing component count by up to 4 passive parts and enabling tighter voltage envelope control in battery-critical systems.
Availability
The MAX968ESA is available at Aetrix Electronics and suitable for 2-cell battery-powered systems, portable medical devices, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MAX968ESA 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 and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and consumer markets.
The MAX965–MAX970 family was engineered specifically for ultra-low-power, single-supply voltage monitoring in battery-operated equipment - prioritizing sub-5µA-per-comparator operation, rail-to-rail input flexibility, and integrated reference stability.
FAQ
What is the maximum supply voltage the MAX968ESA can tolerate?
The MAX968ESA has an absolute maximum supply voltage of +6V. However, its specified operating range is +1.6V to +5.5V. Operation above +5.5V may cause parametric degradation or reliability risk, and the internal 1.235V reference is only guaranteed within the +1.6V to +5.5V range. For robust design, keep VCC ≤ 5.5V. The MAX968ESA remains functional but not fully characterized beyond this limit.
Does the MAX968ESA support true rail-to-rail input operation at 1.6V supply?
Yes, the MAX968ESA supports a common-mode input voltage range of -0.25V to VCC across its full operating temperature range, including at VCC = +1.6V. This means inputs can swing from -0.25V (slightly below ground) up to the positive rail - enabling direct sensing of battery voltages down to 0V without level-shifting circuitry. Input offset voltage remains within specification (≤6.0mV) at this minimum supply.
How is hysteresis programmed on the MAX968ESA?
Hysteresis on the MAX968ESA is programmed by connecting two external resistors between REF, HYST, and GND. R1 connects REF to HYST; R2 connects HYST to GND. The resulting hysteresis band is approximately twice the voltage difference between HYST and REF, adjustable from ±1mV to ±50mV. This configuration applies identical hysteresis to both comparators - a key differentiator from discrete solutions.
Can the MAX968ESA's REF pin drive an external load?
Yes, the REF pin on the MAX968ESA can source up to 50µA while maintaining ±1.5% accuracy over 0°C to +85°C. Typical applications include biasing resistor dividers for threshold setting or driving low-current analog circuitry. For noise-sensitive uses, bypass REF with a 0.1µF capacitor to ground - this reduces peak-to-peak reference noise from ~1.0mV to <100µV.
What is the function of the HYST pin in the MAX968ESA window-comparator configuration?
In the MAX968ESA, the HYST pin configures both comparators identically to create a symmetrical voltage window. When HYST is set to a voltage below REF (e.g., REF − 25mV), it establishes upper and lower trip points centered on the REF-derived thresholds - enabling detection of whether an input signal lies strictly within a defined band. This eliminates the need for separate hysteresis networks on each comparator input.
MAX968ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Window
- Number of Elements:
- 2
- Output Type:
- Open-Drain, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 1.6V ~ 5.5V
- :
- 7mV @ 5.5V
- Voltage - Input Offset (Max):
- 0.05µA @ 5.5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 16µA
- Current - Quiescent (Max):
- 56.48dB CMRR, 80dB PSRR
- CMRR, PSRR (Typ):
- 20µs
- Propagation Delay (Max):
- ±1mV
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
MAX968ESA FAQ
1.How can I place an order for MAX968ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX968ESA 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 MAX968ESA reliable?
The price and inventory of MAX968ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX968ESA is usually 5 days.
3.What payment methods are accepted for MAX968ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX968ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX968ESA?
MAX968ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX968ESA 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 MAX968ESA?
For technical support, including MAX968ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX968ESA requirements.
6.How does Aetrix verify that MAX968ESA is sourced from the original manufacturer or authorized distributors?
All MAX968ESA 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 MAX968ESA meets industry standards.
7.What is the process for return or replacement of MAX968ESA?
All MAX968ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX968ESA, 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 MAX968ESA part is unused and in its original packaging.
Return procedure for MAX968ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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