My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX793RCSE+T
- Part No.:
- MAX793RCSE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX793RCSE+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,708
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX793RCSE+T from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with fixed reset threshold (2.55V–2.70V), backup-battery switchover, active-low open-drain RESET output, and integrated watchdog timer (1.6s timeout). It monitors VCC in battery-backed embedded controllers, asserts reset below threshold, and gates CE signals to protect CMOS RAM during undervoltage events.
For engineers reviewing the MAX793RCSE+T datasheet, MAX793RCSE+T pinout, MAX793RCSE+T application, or MAX793RCSE+T equivalent, key selection criteria include guaranteed reset assertion down to VCC = 1V, battery voltage exceeding VCC capability (up to 3.6V), 7ns CE IN-to-CE OUT propagation delay, and low-line early warning (LOWLINE) for NMI-triggered power-fail response.
Technical Context
The MAX793RCSE+T implements a precision voltage comparator with 10mV typical hysteresis to prevent oscillation during VCC transitions near the 2.55V–2.70V reset threshold. Its internal p-channel MOSFET switch enables seamless switchover from VCC to BATT when VCC falls below VSW (2.52V typ.), with 15mV hysteresis on the VCC-to-VBATT comparator.
It integrates a 1.6s watchdog timer that clears on any WDI transition and asserts WDO low on timeout; WDO can be connected to MR to generate automatic reset pulses. The CE gating circuit operates with <7ns propagation delay in enable mode and holds CE OUT low for 10µs after reset assertion if CE IN is low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Range | 2.55V to 2.70V (R-suffix); guarantees reset assertion before VCC drops below 2.55V and prevents spurious reset above 2.70V |
| Reset Timeout Period | 200ms minimum; ensures µP remains held in reset long enough to stabilize power and clocks after brownout recovery |
| Battery Switch Threshold (VCC falling) | 2.52V typical; triggers switchover to backup battery before reset threshold is reached, preserving RAM data |
| Watchdog Timeout | 1.6s ±25%; provides deterministic fault detection window for µP software hang without external timing components |
| VCC Supply Current | 46µA typical at +25°C, VCC = 3.3V; enables ultra-low-power operation in battery-backed systems |
| CE IN-to-CE OUT Propagation Delay | 7ns max in enable mode; allows use with high-speed µPs without violating CE setup/hold timing |
| Low-Line Comparator Hysteresis | 30mV typical; prevents chatter on LOWLINE output during gradual VCC sag near VLR threshold |
Pinout & Package
MAX793RCSE+T is housed in a 16-pin narrow SO package (SOIC-16, 150mil width), RoHS-compliant and lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply Output | Switched output connected to VCC or BATT; powers CMOS RAM during normal/battery-backup modes |
| 2 VCC | Main Supply Input | Primary 3.0V/3.3V system supply input; powers internal circuitry and defines reset reference |
| 4 PFI | Power-Fail Comparator Input | Monitors external voltage for power-fail warning; used to enable battery freshness seal when pulled low |
| 5 BATT ON | Backup-Switch Driver Output | Active-high logic signal indicating BATT is active; drives external PMOS gate for >75mA load support |
| 6 GND | Ground Reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 7 PFO | Power-Fail Comparator Output | Open-drain output asserting low when PFI < VPFT or VCC < VSW; used for system-level fail-safe signaling |
| 8 MR | Manual Reset Input | Active-low input with 70µA internal pullup; asserts reset for 200ms after release to ensure clean µP restart |
| 9 WDO | Watchdog Output | Open-drain output low on watchdog timeout; connectable to MR for autonomous fault recovery |
| 10 WDI | Watchdog Input | Edge-sensitive input requiring ≥100ns pulse width; resets 1.6s timer on every transition |
| 11 CE IN | Chip-Enable Input | Input to CE gating circuit; high-impedance during reset to isolate memory bus from corrupted cycles |
| 12 CE OUT | Chip-Enable Output | Gated CE signal passed only when reset inactive; holds low for 10µs after reset if CE IN was low |
| 13 RESET | Active-High Reset Output | Pulled up to VCC; sources/sinks current to drive µP reset directly without external pullup |
| 14 LOWLINE | Early Warning Output | Active-low output asserting when VCC falls to VLR (2.85V–3.00V range); triggers NMI for graceful shutdown |
| 15 RESET | Active-Low Reset Output | Open-drain output requiring external pullup; guarantees logic low for 0V < VCC < VRST |
| 16 BATT | Backup-Battery Input | Accepts 3.6V lithium battery; voltage may exceed VCC to extend backup runtime without level-shifting |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Monitoring | Fixed 2.55V–2.70V trip point with 10mV hysteresis ensures reliable brownout detection in 3.0V ±10% systems |
| Backup-Battery Switchover | Internal p-MOSFET enables seamless VCC-to-BATT transition at 2.52V (typ.), supporting 3.6V Li batteries in 3.0V/3.3V systems |
| Chip-Enable Gating | Sub-7ns CE IN-to-CE OUT delay with 10µs hold time prevents write corruption during power-down sequences |
| Guaranteed Reset Below 1V | RESET remains asserted down to VCC = 1V (VBATT > 1V), ensuring µP stays held through deep brownouts |
| Low-Line Early Warning | LOWLINE output asserts at VLR (2.85V–3.00V) with 30mV hysteresis, enabling NMI-based controlled shutdown before reset |
| Integrated Watchdog Timer | 1.6s timeout with edge-triggered WDI input provides autonomous software hang detection without external RC network |
Applications
| Battery-Powered Embedded Controller | Critical µP Power Monitoring |
|---|---|
Use Scenario: Industrial sensor node powered by primary 3.0V supply and backup 3.6V lithium coin cell, operating unattended for years. IC Role / Device Role / Timing Role: Supervisory circuit monitoring VCC, asserting RESET before brownout, switching OUT to BATT, and holding CE OUT to freeze RAM writes. Use Value: Prevents data loss during mains failure by guaranteeing 200ms reset hold and seamless battery switchover at 2.52V. |
Use Scenario: Medical diagnostic device requiring fail-safe power sequencing and deterministic reset behavior under voltage transients. IC Role / Device Role / Timing Role: Primary voltage monitor generating precise RESET and LOWLINE signals; provides watchdog supervision of safety-critical firmware. Use Value: Enables NMI-triggered graceful shutdown via LOWLINE at 2.85V, followed by hard reset at 2.55V - meeting IEC 62304 voltage-margin requirements. |
| Intelligent Controller with RAM Backup | Portable Equipment with Manual Reset |
Use Scenario: Programmable logic controller retaining configuration in CMOS RAM during brief AC outages. IC Role / Device Role / Timing Role: Dual-role supervisor: powers RAM via OUT, gates CE signals to prevent write errors, and monitors battery health via BATT OK (MAX793 variant). Use Value: CE gating with 10µs hold time ensures last write completes before power collapse, eliminating RAM corruption risk. |
Use Scenario: Handheld test instrument with momentary pushbutton for field-initiated system reset. IC Role / Device Role / Timing Role: Manual reset interface with 70µA internal pullup, 200ms reset timeout, and noise-immune MR input accepting TTL/CMOS levels. Use Value: Eliminates need for external pullup resistor or debounce circuitry - reduces BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX793SCSE+T | Reset threshold range 2.85V–3.00V (S-suffix); higher trip point suited for 3.3V ±10% supplies | Used where system brownout margin is tighter and reset must occur later in VCC sag | Select when VCC nominal is 3.3V and design requires reset assertion closer to 3.0V rather than 2.55V |
| MAX793TCSE+T | Reset threshold range 3.00V–3.15V (T-suffix); optimized for 3.3V ±5% systems with minimal tolerance budget | Applied in high-reliability 3.3V systems where reset must not assert until VCC falls below 3.00V | Choose for 3.3V rail monitoring where 3.15V upper limit prevents premature reset during ripple |
Compared with MAX793RCSE+T, the S- and T-suffix variants maintain identical pinout, CE gating, watchdog, and battery switchover functionality but shift the reset threshold upward to match different supply tolerance profiles - enabling precise alignment with 3.0V, 3.3V, or mixed-rail system requirements.
Availability
MAX793RCSE+T is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent controllers, and critical µP power monitoring applications requiring stable component supply across industrial temperature ranges (0°C to +70°C).
Supply support for MAX793RCSE+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, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX793 series belongs to Maxim's microprocessor supervisory product line, engineered specifically to provide robust power monitoring, reset control, and battery backup management for 3.0V/3.3V embedded systems.
FAQ
What is the reset threshold voltage range for MAX793RCSE+T?
The MAX793RCSE+T has a fixed reset threshold range of 2.55V to 2.70V (R-suffix), specified for 3.0V ±10% power supplies. It guarantees reset assertion before VCC falls below 2.55V and prevents spurious reset while VCC remains above 2.70V. This range is factory-trimmed and does not require external resistors - unlike the adjustable MAX794.
Does MAX793RCSE+T support backup-battery voltage higher than VCC?
Yes, MAX793RCSE+T supports VBATT up to 6.0V absolute maximum, and its internal p-channel MOSFET allows VBATT to exceed VCC - enabling direct use of standard 3.6V lithium batteries in 3.0V/3.3V systems. Switchover occurs at VSW = 2.52V (typ.) when VCC falls below VBATT, with 15mV hysteresis to prevent oscillation.
How does the watchdog function operate in MAX793RCSE+T?
The MAX793RCSE+T includes a 1.6s watchdog timer that monitors the WDI input. If no edge (high-to-low or low-to-high) occurs within 1.6s, WDO goes low. WDO returns high on the next WDI transition. The timer is disabled during reset assertion. WDO can be connected to MR to generate automatic reset pulses on timeout - a feature confirmed in the MAX793/MAX794 family documentation.
What is the purpose of the LOWLINE output on MAX793RCSE+T?
The LOWLINE output on MAX793RCSE+T is an active-low early warning signal that asserts when VCC falls to the low-line threshold (VLR = 2.85V–3.00V for R-suffix). It provides ~150mV headroom above the reset threshold, allowing systems to trigger non-maskable interrupts (NMI) for graceful shutdown or data save before reset occurs - a confirmed function per the Selector Guide and Typical Operating Circuit.
Can MAX793RCSE+T be used without a backup battery?
Yes, MAX793RCSE+T operates fully without a backup battery. When BATT is tied to VCC or left unconnected, the internal switchover circuit remains inactive and OUT is always connected to VCC. All supervisory functions - RESET, LOWLINE, WDO, CE gating, and MR - remain fully operational. The device draws only 46µA typical supply current in this configuration.
MAX793RCSE+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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Open Drain, 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
MAX793RCSE+T FAQ
1.How can I place an order for MAX793RCSE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX793RCSE+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 MAX793RCSE+T reliable?
The price and inventory of MAX793RCSE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX793RCSE+T is usually 5 days.
3.What payment methods are accepted for MAX793RCSE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX793RCSE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX793RCSE+T?
MAX793RCSE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX793RCSE+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 MAX793RCSE+T?
For technical support, including MAX793RCSE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX793RCSE+T requirements.
6.How does Aetrix verify that MAX793RCSE+T is sourced from the original manufacturer or authorized distributors?
All MAX793RCSE+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 MAX793RCSE+T meets industry standards.
7.What is the process for return or replacement of MAX793RCSE+T?
All MAX793RCSE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX793RCSE+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 MAX793RCSE+T part is unused and in its original packaging.
Return procedure for MAX793RCSE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX793RCSE+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…
