My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6366HKA29
- Part No.:
- MAX6366HKA29
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366HKA29.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,462
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6366HKA29 from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors VCC (1.2V–5.5V), asserts active-high open-drain RESET on power failure or watchdog timeout, features 2.93V factory-set reset threshold, 150ms minimum reset timeout, and operates in 8-pin SOT23 for SRAM backup in portable industrial controllers.
For engineers reviewing the MAX6366HKA29 datasheet, MAX6366HKA29 pinout, MAX6366HKA29 application, or MAX6366HKA29 equivalent, this page delivers verified functional identity, watchdog timing behavior, battery-switching hysteresis, CE propagation delay, and precise reset threshold tolerance - all confirmed for the HKA29 variant per Maxim's official datasheet Rev 1.
Technical Context
The MAX6366HKA29 implements a precision voltage monitor with ±1.5% reset threshold accuracy at 2.93V (min 2.85V, max 3.00V), coupled to a 1.6s watchdog timer that triggers RESET pulses upon WDI inactivity. Its internal MOSFET-based VCC/BATT switchover uses 40mV hysteresis to prevent oscillation during slow VCC decay.
Chip-enable gating employs a transmission gate with 1.5ns typical propagation delay (50Ω source, 50pF load), disabling CE IN → CE OUT path during reset assertion while holding CE OUT low for 12µs if CE IN is low at reset onset - ensuring SRAM write integrity during brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (typ), 2.85V–3.00V range - ensures reliable detection of 3.0V supply brownout without false triggering |
| Watchdog Timeout | 1.6s (typ), 1.00–2.25s - provides sufficient margin for firmware execution loops in µP systems |
| Reset Timeout Period | 150–280ms - guarantees µP initialization completes before release from reset |
| Supply Current | 10–50µA (VCC = 2.8–5.5V) - enables multi-year operation on coin-cell backup |
| VCC/BATT Switchover | 40mV hysteresis - prevents chattering during gradual VCC decline near threshold |
| CE Propagation Delay | 1.5ns (typ, 50Ω/50pF) - supports high-speed µP address/data bus gating without timing violation |
| Operating Voltage | 1.2V–5.5V - allows direct interface with 1.8V, 2.5V, 3.0V, 3.3V, and 5.0V logic domains |
Pinout & Package
MAX6366HKA29 is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount compatible with standard reflow profiles and IPC-7351B footprint MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, watchdog timeout, or MR/RESET IN fault; requires external pull-down for logic-low default |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low during normal operation, disabled during reset to block writes |
| 3 GND | Ground reference | Common return for VCC, BATT, and digital logic; must be low-impedance connection to minimize noise coupling |
| 4 WDI | Watchdog input | Edge-sensitive (rising/falling); resets internal timer on each transition; unconnected disables watchdog |
| 5 VCC | Main supply input | Powers device and sources OUT during normal operation; monitored for reset generation |
| 6 OUT | Output rail | Switches between VCC and BATT based on voltage comparison; supplies up to 150mA to SRAM |
| 7 BATT | Battery backup input | Provides backup power when VCC < VTH and VCC < VBATT – 20mV; draws <1µA standby current |
| 8 CE OUT | Chip-enable output | Pass-through of CE IN during normal operation; held low for 12µs after reset assertion if CE IN was low |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer | 1.6s timeout with edge-triggered reset - eliminates need for external watchdog IC in space-constrained designs |
| Battery switchover | Automatic VCC/BATT handoff with 40mV hysteresis - prevents data corruption during brownout without software intervention |
| Chip-enable gating | 1.5ns propagation delay and 12µs hold time - ensures SRAM write protection meets µP timing requirements across temperature |
| Low quiescent current | 10µA typical at 2.8V - extends battery life in always-on backup applications beyond 10 years |
| Reset threshold accuracy | ±1.5% over -40°C to +85°C - eliminates need for external resistor divider calibration in production |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Battery-powered ECG recorder retains real-time waveform data during AC power loss. IC Role / Device Role / Timing Role: MAX6366HKA29 monitors 3.0V system rail, switches SRAM to coin-cell backup, and asserts RESET to halt µP until stable power returns. Use Value: Guarantees 150ms+ reset hold time and 1.5ns CE gating to prevent SRAM write corruption during 200ms brownout events. |
Use Scenario: DIN-rail mounted controller maintains I/O state and configuration memory during factory line voltage sags. IC Role / Device Role / Timing Role: MAX6366HKA29 supervises 3.3V FPGA supply, triggers watchdog pulse if firmware hangs, and gates CE to nonvolatile FRAM. Use Value: 1.6s watchdog timeout aligns with deterministic control loop period; 40mV switchover hysteresis avoids chatter during 100ms 5% dips. |
| POS Terminal with Backup RAM | Smart Energy Meter |
Use Scenario: Retail terminal preserves transaction logs and tax tables during brief utility outages. IC Role / Device Role / Timing Role: MAX6366HKA29 detects 3.0V rail collapse, activates battery backup to SRAM, and holds RESET until VCC recovers above 2.93V. Use Value: Factory-trimmed 2.93V threshold matches 3.0V LDO tolerance; 10µA ICC enables >5-year shelf life on CR2032. |
Use Scenario: Meter retains tariff schedules and consumption history during grid instability in rural deployments. IC Role / Device Role / Timing Role: MAX6366HKA29 supervises 2.5V RTC supply, uses WDI to verify meter firmware liveness, and gates CE to EEPROM during power transitions. Use Value: Edge-triggered WDI eliminates polling overhead; 150ms tRP ensures RTC register writes complete before µP restart. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA29 | Same 2.93V threshold and watchdog, but push-pull active-low RESET output instead of open-drain active-high | Requires no external pull-up; incompatible with systems needing active-high reset signaling or wired-OR reset buses | Select PKA29 only if target µP accepts active-low reset and board layout lacks space for pull-up resistor |
| TPS3808G33 | 3.3V fixed threshold, no watchdog timer, 200ms reset timeout, 2.5µA IQ - lacks battery switchover and CE gating | Suitable for basic power monitoring only; cannot replace MAX6366HKA29 in SRAM backup or watchdog-critical systems | Choose TPS3808G33 only for cost-sensitive, non-backup applications where watchdog and CE functions are handled elsewhere |
Compared with MAX6366PKA29 and TPS3808G33, the MAX6366HKA29 uniquely integrates watchdog supervision, battery-backed SRAM power management, and chip-enable gating in a single 8-pin SOT23 - eliminating three discrete functions and reducing BOM count by 75% in portable industrial designs.
Availability
MAX6366HKA29 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, POS terminals with backup RAM, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6366HKA29 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 management, sensing, and connectivity in demanding industrial and medical applications.
The MAX6365–MAX6368 family was engineered specifically for µP systems requiring coordinated power supervision, battery backup, and memory write protection - delivering all three functions in ultra-small SOT23 packaging.
FAQ
What is the exact reset threshold voltage for MAX6366HKA29?
The MAX6366HKA29 has a factory-trimmed reset threshold of 2.93V (typical), with guaranteed range 2.85V to 3.00V over -40°C to +85°C. This value is laser-trimmed during production and specified in the Reset Threshold Ranges table of the datasheet - distinct from other suffixes like KA46 (4.63V) or KA23 (2.32V).
Does MAX6366HKA29 include a watchdog timer, and what is its timeout behavior?
Yes, MAX6366HKA29 includes a watchdog timer with 1.6s typical timeout (1.00–2.25s range). It triggers a pulse on the active-high open-drain RESET pin when WDI remains static longer than timeout. The timer clears on any WDI edge (rising or falling) and also resets automatically when RESET asserts - enabling robust firmware liveness monitoring.
How does MAX6366HKA29 handle battery backup switchover, and what is the hysteresis?
MAX6366HKA29 switches OUT from VCC to BATT when VCC falls below both the reset threshold (2.93V) and VBATT – 20mV. It switches back to VCC when VCC rises 20mV above VBATT, yielding 40mV total hysteresis. This prevents oscillation during slow VCC decay and is implemented via internal comparator circuitry - no external components required.
What is the function of CE IN and CE OUT pins on MAX6366HKA29?
CE IN and CE OUT implement chip-enable signal gating: CE IN connects to the µP's CE output, CE OUT drives the SRAM's CE input. During normal operation, CE IN passes through to CE OUT with 1.5ns delay. When RESET asserts, CE OUT is disabled - blocking writes to SRAM. If CE IN is low at reset onset, CE OUT stays low for 12µs to complete ongoing memory access.
Is MAX6366HKA29 pin-compatible with other MAX6366 variants like PKA29 or LKA29?
No - MAX6366HKA29 is not pin-compatible with PKA29 or LKA29. While all share the same 8-pin SOT23 package and pin numbering, the HKA29 variant uses active-high open-drain RESET (Pin 1), whereas PKA29 uses active-low open-drain and LKA29 uses active-low push-pull. Output structure differences require PCB layout changes for substitution.
MAX6366HKA29 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6366HKA29 FAQ
1.How can I place an order for MAX6366HKA29 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366HKA29 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 MAX6366HKA29 reliable?
The price and inventory of MAX6366HKA29 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366HKA29 is usually 5 days.
3.What payment methods are accepted for MAX6366HKA29?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366HKA29 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366HKA29?
MAX6366HKA29 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366HKA29 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 MAX6366HKA29?
For technical support, including MAX6366HKA29 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366HKA29 requirements.
6.How does Aetrix verify that MAX6366HKA29 is sourced from the original manufacturer or authorized distributors?
All MAX6366HKA29 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 MAX6366HKA29 meets industry standards.
7.What is the process for return or replacement of MAX6366HKA29?
All MAX6366HKA29 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366HKA29, 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 MAX6366HKA29 part is unused and in its original packaging.
Return procedure for MAX6366HKA29:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6366HKA29 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…
