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Analog Devices Inc./Maxim Integrated MAX6368PKA46-T
- Part No.:
- MAX6368PKA46-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368PKA46-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6368PKA46-T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input, battery-backup switchover, and chip-enable gating. It monitors VCC supply (1.2V–5.5V), asserts active-low open-drain RESET when VCC falls below 4.63V (factory preset), provides 150ms minimum reset timeout, and supports CMOS RAM write protection via CE IN/CE OUT path with 1.5ns propagation delay. It is used in portable equipment requiring reliable brownout detection and backup power handover.
For engineers reviewing the MAX6368PKA46-T datasheet, MAX6368PKA46-T pinout, MAX6368PKA46-T application, or MAX6368PKA46-T equivalent, key selection criteria include its 4.63V reset threshold, 10µA quiescent current, 1.235V auxiliary RESET IN comparator, SOT23-8 package, and support for battery-backed memory retention in POS terminals and industrial controllers.
Technical Context
The MAX6368PKA46-T integrates a precision voltage monitor, an auxiliary reset comparator referenced to 1.235V, a bidirectional VCC/BATT switchover MOSFET (RON ≤ 4.6Ω at VCC = 2.38V), and a transmission-gate-based chip-enable gating circuit with 12µs reset-to-CE OUT delay. Its internal logic ensures CE OUT remains stable during reset assertion, preventing spurious writes to SRAM.
It operates across -40°C to +85°C, guarantees RESET validity down to 1.2V on either VCC or VBATT, and features 150ms min reset timeout with ±10% temperature stability. The device uses no external components for primary reset function and supports user-programmable secondary undervoltage detection via resistor divider on RESET IN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (factory preset, ±0.13V over temp) - ensures reliable detection of +5V rail brownout before system instability. |
| RESET Output Type | Open-drain active-low - enables wired-OR configuration and compatibility with diverse µP reset inputs. |
| Quiescent Current | 10µA (typ) at VCC = 5.5V - minimizes standby power in battery-critical applications like portable medical devices. |
| RESET IN Threshold | 1.235V (±50mV) - allows precise secondary supply monitoring (e.g., 4.60V via R1/R2 divider) without external reference. |
| VCC to OUT RON | 4.6Ω max at VCC = 2.38V, IOUT = 25mA - enables low-loss main-supply pass-through up to 150mA. |
| Battery Backup Mode ICC | 3µA (max) at VBATT = 2.8V, VCC = 0V - preserves multi-year battery life in memory-retention applications. |
| CE IN to CE OUT Delay | 1.5ns (typ) - supports high-speed µP/DSP interfaces without timing violation in SRAM access paths. |
Pinout & Package
MAX6368PKA46-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead(Pb)-free compatible ('-T' suffix denotes tape-and-reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low continuously during VCC < 4.63V, RESET IN < 1.235V, or after reset timeout; requires external pull-up for logic-high state. |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; held low during reset to block erroneous writes; internal 20kΩ pull-up if unused. |
| 3 GND | Ground reference | Common return for VCC, BATT, and all internal circuitry; must be low-impedance connection for noise immunity. |
| 4 RESET IN | Auxiliary reset comparator input | Monitors external voltage divider; falling edge below 1.235V triggers reset; leakage ±25nA enables high-R dividers. |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation; reset asserted if < 4.63V. |
| 6 OUT | Power output to SRAM | Switches between VCC and BATT based on voltage comparison; delivers up to 150mA from VCC or 20mA from battery. |
| 7 BATT | Backup battery input | Connects to Li-ion or coin cell; activates when VCC < VTH and VCC < VBATT – 20mV; 40mV hysteresis prevents chatter. |
| 8 CE OUT | Chip-enable output | Passes CE IN during normal operation; forced low for 12µs after reset assertion to complete ongoing memory cycle. |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable RESET IN | 1.235V internal reference enables programmable secondary supply monitoring (e.g., 4.60V) with <1% error using standard resistors. |
| Battery switchover control | Automatic VCC/BATT handover with 40mV hysteresis ensures glitch-free RAM power continuity during brownout. |
| Chip-enable gating | 1.5ns propagation delay and 20–100Ω on-resistance allow direct integration into high-speed µP address/data buses without timing penalty. |
| Low-voltage operation | Guaranteed functionality down to 1.2V on VCC or VBATT enables use with ultra-low-power MCUs and energy-harvesting systems. |
| Transient immunity | Withstands VCC glitches as short as 30µs at 100mV overdrive - eliminates false resets in noisy industrial environments. |
Applications
| POS Terminal Power Management | Industrial Controller Brownout Protection |
|---|---|
Use Scenario: Battery-backed memory retention during AC mains failure in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, automatic BATT switchover, and CE gating to preserve SRAM contents. Use Value: Prevents transaction data loss during 100ms–500ms utility outages by maintaining SRAM power and blocking write cycles during fault. |
Use Scenario: Reliable reset and memory protection in PLCs exposed to 24VDC supply fluctuations in factory settings. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET on 24V-derived +5V rail drop, while gating CE to prevent corrupted I/O register writes. Use Value: Eliminates spurious controller reboots and memory corruption during line transients, improving MTBF by >30%. |
| Portable Medical Monitor Data Retention | Set-Top Box Real-Time Clock Backup |
Use Scenario: Maintaining patient parameter history in handheld ECG monitors during battery swap or low-battery conditions. IC Role / Device Role / Timing Role: Dual-role supervisor: primary VCC monitor (4.63V) + secondary RESET IN monitor (for 3.3V analog supply). Use Value: Ensures uninterrupted SRAM logging even if main battery dips below 3.3V while backup cell sustains RTC and memory. |
Use Scenario: Preserving real-time clock and channel settings in consumer set-top boxes during power cycling. IC Role / Device Role / Timing Role: Battery switchover controller connecting coin cell to RTC/SRAM when main 3.3V rail collapses. Use Value: Enables instant-on behavior and accurate timekeeping across unplanned outages without capacitor-based hold-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367PKA46-T | Replaces RESET IN with BATT ON push-pull output; identical reset threshold, package, and backup switchover. | Used where battery-backup status indication (e.g., LED driver) is required instead of secondary supply monitoring. | Select MAX6367PKA46-T if BATT ON signal is needed; MAX6368PKA46-T is preferred for dual-rail monitoring. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no battery switchover or CE gating; 1.8µA IQ, SOT23-6 package. | Suitable only for basic reset generation in non-backup systems; lacks memory protection and auxiliary input. | Choose TPS3808G33DBVR for cost-sensitive, single-rail applications without backup or CE requirements. |
Compared with MAX6367PKA46-T, MAX6368PKA46-T trades BATT ON status signaling for programmable secondary undervoltage detection-enabling robust dual-supply monitoring in safety-critical embedded systems. Against TPS3808G33DBVR, it adds full battery backup, CE gating, and flexible reset input at higher complexity and footprint.
Availability
MAX6368PKA46-T is available at Aetrix Electronics and suitable for POS terminals, industrial PLCs, portable medical monitors, and set-top boxes requiring stable component supply, long-term lifecycle support, and guaranteed lead(Pb)-free compliance.
Supply support for MAX6368PKA46-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) designs precision analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration for embedded systems.
The MAX6365–MAX6368 family targets space-constrained µP systems needing combined reset supervision, battery backup, and memory write protection - eliminating discrete diodes, MOSFETs, and comparators in compact portable and industrial designs.
FAQ
What is the factory-set reset threshold voltage for MAX6368PKA46-T?
The MAX6368PKA46-T has a factory-preset reset threshold of 4.63V (typical), with a guaranteed range of 4.50V to 4.75V across temperature and process variation. This value is laser-trimmed during production and applies to the primary VCC supply monitoring function - not the auxiliary RESET IN comparator, which uses a fixed 1.235V internal reference.
How does the RESET IN pin on MAX6368PKA46-T function in practice?
The RESET IN pin on MAX6368PKA46-T compares an external voltage against a 1.235V internal reference. When the applied voltage falls below 1.235V, the device asserts RESET. It is commonly used with a resistor divider to monitor secondary supplies (e.g., a 4.60V rail), enabling dual-rail fault detection without external components. Input leakage is ±25nA, supporting high-value dividers.
Can MAX6368PKA46-T operate with VCC below 2.0V?
Yes, MAX6368PKA46-T guarantees full functionality down to 1.2V on VCC or VBATT, including RESET assertion, CE gating, and battery switchover. Its 10µA quiescent current and 1.2V minimum operating voltage make it suitable for ultra-low-power applications such as energy-harvesting sensors and coin-cell-powered IoT nodes.
What is the purpose of the CE IN and CE OUT pins on MAX6368PKA46-T?
The CE IN and CE OUT pins implement hardware-enforced chip-enable gating: CE IN connects to the µP's chip-select signal, and CE OUT drives the SRAM's CE input. During reset, CE OUT is forced low for 12µs to complete any ongoing memory access, then disconnected - preventing spurious writes during power faults. Propagation delay is 1.5ns (typ), supporting high-speed interfaces.
Does MAX6368PKA46-T require external components for basic operation?
No, MAX6368PKA46-T requires no external components for core functions: VCC monitoring, battery switchover, and RESET assertion. A 0.1µF bypass capacitor on VCC is recommended for transient immunity, and a resistor divider is needed only if using RESET IN for secondary supply monitoring. The internal 20kΩ MR pull-up (not used on MAX6368) is absent here, simplifying layout.
MAX6368PKA46-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6368PKA46-T FAQ
1.How can I place an order for MAX6368PKA46-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368PKA46-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 MAX6368PKA46-T reliable?
The price and inventory of MAX6368PKA46-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368PKA46-T is usually 5 days.
3.What payment methods are accepted for MAX6368PKA46-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368PKA46-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368PKA46-T?
MAX6368PKA46-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368PKA46-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 MAX6368PKA46-T?
For technical support, including MAX6368PKA46-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368PKA46-T requirements.
6.How does Aetrix verify that MAX6368PKA46-T is sourced from the original manufacturer or authorized distributors?
All MAX6368PKA46-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 MAX6368PKA46-T meets industry standards.
7.What is the process for return or replacement of MAX6368PKA46-T?
All MAX6368PKA46-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368PKA46-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 MAX6368PKA46-T part is unused and in its original packaging.
Return procedure for MAX6368PKA46-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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