My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX820TCSE+T
- Part No.:
- MAX820TCSE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX820TCSE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,458
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX820TCSE+T from Maxim Integrated is a microprocessor supervisory circuit with ±2% reset and low-line threshold accuracy, 200ms reset timeout, manual-reset input, and integrated watchdog timer with programmable timeout via SWT pin. It monitors VCC (2.75V–5.5V), asserts active-low RESET down to 1V supply, and provides CE signal gating for nonvolatile memory write protection in embedded controllers and industrial systems.
For engineers reviewing the MAX820TCSE+T datasheet, MAX820TCSE+T pinout, MAX820TCSE+T application, or MAX820TCSE+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset/low-line thresholds (3.06V internal), watchdog timing behavior, CE propagation delay (10ns max), and real-world substitution guidance - all grounded in Maxim's official MAX792/MAX820 datasheet Rev. 4.
Technical Context
The MAX820TCSE+T implements dual-voltage monitoring using independent comparators: one for reset assertion at 3.06V (±2%) and another for low-line warning 120mV above that threshold. Its watchdog function uses an external capacitor on SWT to set timeout (e.g., 1.6s default with SWT = VCC), and generates both pulse (WDPO) and latched (WDO) fault outputs with 70ns timing relationship.
It integrates a bidirectional chip-enable transmission gate (CE IN → CE OUT) with 10ns max propagation delay and 15µs hold time during reset assertion to ensure memory write-cycle completion. The device supports both internal threshold mode (RESET IN/INT = GND) and external resistor-programmed thresholds, with MR input internally pulled up and validated for 25µs minimum pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.06V ±2% (internal mode); guarantees valid RESET output down to VCC = 1V |
| Low-Line Threshold | 3.18V (120mV above reset threshold); triggers LOW LINE output for NMI before reset |
| Reset Timeout Period | 200ms typical; ensures stable µP initialization after power-up or brownout recovery |
| Watchdog Timeout | 1.6s nominal (SWT = VCC); adjustable via capacitor (e.g., 4.7nF → ~127ms at 5V) |
| CE Propagation Delay | 10ns maximum; enables reliable gating of fast chip-enable signals in µP bus systems |
| Supply Current | 70µA typical at +25°C; supports low-power operation in battery-backed or energy-sensitive designs |
| Operating Temp Range | 0°C to +70°C; qualified for commercial-grade embedded controller and instrumentation use |
Pinout & Package
MAX820TCSE+T is housed in a 16-pin narrow SOIC (SO-16N) package, 3.9mm width, with standard JEDEC MS-012AC footprint and lead-free (+T suffix) construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RESET / RESET | Complementary active-low and active-high reset outputs; RESET sinks 1.6mA at 0.1V, valid to VCC = 1V |
| 3 | VCC | Main supply input (2.75V–5.5V); powers all internal comparators, timers, and gating logic |
| 4 | RESET IN/INT | Mode select: ≤60mV = internal threshold; ≥600mV = external resistor-programmed thresholds |
| 5 | LLIN/REFOUT | In external mode: low-line comparator input; in internal mode: buffered 1.30V reference output |
| 6, 7 | OVO / OVI | Uncommitted overvoltage comparator (OVI input, OVO open-drain output); no effect on other functions |
| 8 | SWT | Watchdog timeout programming input; connect to VCC for 1.6s default or capacitor to GND for adjustment |
| 9 | MR | Manual-reset input; internally pulled up; 1.30V threshold; 25µs min pulse width required |
| 10 | LOW LINE | Active-low NMI output; asserts 120mV above reset threshold to warn µP before reset occurs |
| 11 | WDI | Watchdog input; transition (high/low/pulse ≥100ns) resets internal timer; floating not allowed |
| 12 | GND | Ground reference for all analog comparators, digital logic, and output drivers |
| 13 | CE OUT | Chip-enable output; gated by CE IN and reset state; holds low 15µs after reset if CE IN was low |
| 14 | CE IN | Chip-enable input; high-impedance when reset asserted; enables memory write-cycle completion |
| 15, 16 | WDO / WDPO | WDPO pulses low 70ns before WDO asserts; WDO remains latched until next WDI transition |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Reset Threshold Accuracy | Guaranteed over temperature (0°C to +70°C); eliminates need for external calibration in critical monitoring |
| Two-Stage Power-Fail Warning | LOW LINE asserts 120mV above reset threshold, enabling early NMI-based system response before reset |
| Pulsed Watchdog Output (WDPO) | Provides 500µs–6ms advance warning of impending WDO assertion, supporting fail-safe shutdown sequencing |
| On-Board CE Signal Gating | 10ns max propagation delay and 15µs hold time prevent RAM corruption during power-down transitions |
| Memory Write-Cycle Completion | CE OUT remains low for 15µs after reset assertion if CE IN was low, ensuring final memory write completes |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Monitors 3.3V supply rail in a DIN-rail mounted PLC executing real-time I/O control logic. IC Role / Device Role / Timing Role: Supervisory circuit providing 3.06V reset, 3.18V low-line NMI, and 200ms power-up delay to ensure deterministic boot sequence. Use Value: Prevents spurious code execution during brownout; enables graceful I/O shutdown via LOW LINE interrupt before full reset. |
Use Scenario: Secures boot integrity in a portable ultrasound imaging device with battery-backed SRAM and flash storage. IC Role / Device Role / Timing Role: Dual-role supervisor: resets µP on VCC drop below 3.06V and gates CE to protect SRAM writes during power collapse. Use Value: Eliminates data corruption risk during battery swap or low-battery conditions via 15µs CE hold time and 1V-valid RESET. |
| Telecom Base Station Management | Automotive Infotainment Head Unit |
Use Scenario: Manages power sequencing and fault detection in a remote radio unit (RRU) with FPGA and DSP subsystems. IC Role / Device Role / Timing Role: Watchdog supervisor with 1.6s timeout and WDPO/WDO outputs feeding FPGA safety logic for hardware-initiated reboot. Use Value: Enables two-fault shutdown (via WDPO-triggered flip-flop) to prevent runaway firmware without software intervention. |
Use Scenario: Ensures reliable startup and runtime supervision of a Linux-based head unit powered from vehicle 12V via DC/DC converter. IC Role / Device Role / Timing Role: Monitors 5V intermediate rail; asserts RESET on brownout and provides LOW LINE NMI for OS-level voltage warning. Use Value: Supports automotive cold-cranking (VCC down to 1V) with guaranteed RESET validity and ±2% threshold stability across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX792TCSE+T | Same pinout and function, but ±3% reset threshold accuracy (vs. ±2% for MAX820); higher supply current (150µA vs. 70µA) | Lacks the tighter threshold tolerance needed for precision 3.3V or 5V rail monitoring under wide temperature swing | Select MAX792TCSE+T only if cost sensitivity outweighs accuracy requirements and design tolerates wider reset window |
| TPS3808G30DBVR | Single-output (active-low RESET only), no low-line/NMI output, no CE gating, no WDPO; 3.0V fixed threshold, 200ms delay | Cannot replace MAX820TCSE+T in systems requiring NMI signaling, memory write protection, or watchdog pulse warning | Use only in simple reset-only applications where WDPO, LOW LINE, CE gating, and dual reset outputs are unnecessary |
Compared with MAX792TCSE+T and TPS3808G30DBVR, the MAX820TCSE+T uniquely combines ±2% threshold accuracy, dual reset outputs, low-line NMI, CE signal gating, and pulsed watchdog functionality - making it irreplaceable in systems demanding coordinated power-fail response, memory integrity, and hardware-level fault escalation.
Availability
MAX820TCSE+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, telecom base station management units, and automotive infotainment head units requiring stable component supply with guaranteed long-term availability.
Supply support for MAX820TCSE+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX820 belongs to Maxim's microprocessor supervisory product line, designed specifically for robust power-monitoring, reset generation, and memory protection in mission-critical embedded systems operating across commercial temperature ranges.
FAQ
What is the exact reset threshold voltage of the MAX820TCSE+T?
The MAX820TCSE+T has a nominal reset threshold voltage of 3.06V in internal threshold mode, with guaranteed ±2% accuracy over 0°C to +70°C. This value is factory-trimmed and confirmed in the MAX792/MAX820 datasheet Rev. 4 Electrical Characteristics table for the 'T' suffix variant. The threshold remains stable across temperature, with normalized variation under 1.125× at +125°C.
Does the MAX820TCSE+T support external programming of reset and low-line thresholds?
Yes, the MAX820TCSE+T supports external programming via the RESET IN/INT and LLIN/REFOUT pins. Pulling RESET IN/INT above 600mV disconnects internal references and enables an external resistor divider to set custom thresholds. The MAX820TCSE+T retains its ±2% accuracy advantage even in external mode when using precision resistors, unlike the MAX792 series.
How does the watchdog function behave when VCC drops below the reset threshold?
When VCC falls below the 3.06V reset threshold, the watchdog function in the MAX820TCSE+T is automatically disabled - WDI monitoring halts, WDPO and WDO remain high, and no timeout events occur. This prevents false watchdog assertions during power failure. The watchdog resumes normal operation only after VCC rises above the reset threshold and the 200ms reset timeout expires.
What is the purpose of the CE IN and CE OUT pins on the MAX820TCSE+T?
The CE IN and CE OUT pins implement a transmission gate that controls chip-enable signals to nonvolatile memory. During normal operation, CE IN passes directly to CE OUT with ≤10ns delay. When reset is asserted, CE OUT is held low for 15µs (if CE IN was low) to complete ongoing memory writes - a key feature for preventing SRAM/EEPROM corruption during brownout.
Can the MAX820TCSE+T be used with a 3.3V supply, and what reset behavior is guaranteed?
Yes, the MAX820TCSE+T operates from 2.75V to 5.5V and is fully specified at 3.3V. Its RESET output is guaranteed valid down to VCC = 1V, meaning it continues asserting reset even as the 3.3V rail collapses to 1V - a critical capability for safe shutdown in low-voltage brownout scenarios. The 3.06V threshold ensures reliable detection well above typical 3.3V rail tolerance.
MAX820TCSE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-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:
- 3.06V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX820TCSE+T FAQ
1.How can I place an order for MAX820TCSE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX820TCSE+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 MAX820TCSE+T reliable?
The price and inventory of MAX820TCSE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX820TCSE+T is usually 5 days.
3.What payment methods are accepted for MAX820TCSE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX820TCSE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX820TCSE+T?
MAX820TCSE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX820TCSE+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 MAX820TCSE+T?
For technical support, including MAX820TCSE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX820TCSE+T requirements.
6.How does Aetrix verify that MAX820TCSE+T is sourced from the original manufacturer or authorized distributors?
All MAX820TCSE+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 MAX820TCSE+T meets industry standards.
7.What is the process for return or replacement of MAX820TCSE+T?
All MAX820TCSE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX820TCSE+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 MAX820TCSE+T part is unused and in its original packaging.
Return procedure for MAX820TCSE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX820TCSE+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…
