My Inquiry
My Account
Analog Devices Inc./Maxim Integrated DS1819CR-20/T&R
- Part No.:
- DS1819CR-20/T&R
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
DS1819CR-20/T&R.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,016
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS1819CR-20/T&R from Maxim Integrated is a 3.3V microprocessor supervisory circuit in SOT-23-5 package, providing active-low reset output, pushbutton reset input, and watchdog timer functionality. It monitors VCC with ±20% trip accuracy (2.55V–2.70V), delivers 140ms minimum reset pulse width, and operates across –40°C to +85°C for embedded control and industrial microcontroller systems.
For engineers reviewing the DS1819CR-20/T&R datasheet, DS1819CR-20/T&R pinout, DS1819CR-20/T&R application, or DS1819CR-20/T&R equivalent, key selection criteria include VCC trip point tolerance, reset timing consistency, pushbutton debounce behavior, watchdog timeout (1.12s), and compatibility with 3.0V microprocessor power rails.
Technical Context
The DS1819CR-20/T&R implements a precision voltage monitor with 5mV hysteresis, a 1.12s watchdog timer triggered by ST input transitions, and internal pushbutton debouncing with 140ms reset assertion on PBRST release. Its RST output uses a push-pull driver valid down to 1.0V VCC.
It supports three functional variants: 'A' (RST, PBRST, ST), 'B' (RST, RST, ST), and 'C' (RST, RST, PBRST). DS1819CR-20/T&R is the 'C' variant with ±20% VCC threshold for 3.0V systems, featuring both active-low and active-high reset outputs and pushbutton reset input - no strobe input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 2.55V–2.70V (±20% tolerance for 3.0V systems; ensures reliable reset during brownout) |
| Reset Pulse Width | 140–280ms (guarantees sufficient processor stabilization time after power recovery) |
| Operating Temp | –40°C to +85°C (supports industrial-grade embedded deployment without derating) |
| Supply Current | 8–12µA (ultra-low quiescent draw enables battery-backed or energy-sensitive designs) |
| Output Drive | 350µA high / 3.2–6mA low (push-pull RST drives standard CMOS inputs directly) |
| Hysteresis | 5mV (prevents chatter near trip point during slow VCC ramp-up/down) |
| Input Capacitance | 5pF (minimizes signal loading on PBRST and reset-critical control lines) |
Pinout & Package
SOT-23-5 surface-mount package (2.9mm × 1.6mm × 1.1mm), lead-free and RoHS-compliant, optimized for space-constrained PCB layouts in portable and industrial controllers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low reset output; asserted low during VCC fault, power-up, or PBRST release |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers |
| 3 | RST | Active-high reset output; complements Pin 1 for dual-signaling or level-shifting interfaces |
| 4 | PBRST | Pushbutton reset input; internally pulled up to VCC (50kΩ typical); debounced and timed |
| 5 | VCC | 3.0V nominal supply input; powers internal reference, comparator, and logic (1.0V–5.5V operating range) |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | Simultaneous active-low and active-high RST signals simplify interface to mixed-logic microcontrollers |
| Pushbutton debounce & timing | Hardware-debounced PBRST input guarantees ≥140ms clean reset pulse regardless of switch bounce |
| Voltage monitor accuracy | ±20% trip tolerance tightly matched to 3.0V system rails, eliminating external resistor networks |
| Low-power operation | Sub-12µA ICC enables use in always-on monitoring without compromising battery life |
| Full-rail reset validity | RST remains valid down to 1.0V VCC; optional pull-down extends validity to 0V for fail-safe shutdown |
Applications
| Industrial PLC Controller | Smart Metering Module |
|---|---|
Use Scenario: Power interruption during firmware update causes partial write corruption in flash memory. IC Role / Device Role / Timing Role: DS1819CR-20/T&R asserts RST during VCC sag below 2.55V and holds it for ≥140ms post-recovery to block CPU execution until stable power resumes. Use Value: Prevents invalid state entry and ensures deterministic boot sequence after grid transients. | Use Scenario: Field technician initiates manual reset via front-panel button to clear communication lockup. IC Role / Device Role / Timing Role: DS1819CR-20/T&R accepts mechanical PBRST input, debounces it, and generates a precise 140ms reset pulse on both RST and RST outputs. Use Value: Eliminates need for external RC network or microcontroller GPIO polling, reducing BOM count and firmware complexity. |
| Medical Sensor Node | Automotive Body Control Unit |
Use Scenario: Battery voltage dips during cold cranking triggers unreliable MCU operation in wearable diagnostic sensor. IC Role / Device Role / Timing Role: DS1819CR-20/T&R monitors 3.0V LDO output and forces hard reset when VCC falls below 2.55V, with hysteresis preventing oscillation near threshold. Use Value: Guarantees safe shutdown and restart without software intervention, meeting IEC 60601-1 reliability requirements. | Use Scenario: ECU experiences intermittent lockup due to electromagnetic interference on CAN bus lines. IC Role / Device Role / Timing Role: DS1819CR-20/T&R provides hardware-enforced reset independent of CAN controller status, using dedicated PBRST line tied to service port. Use Value: Enables field-serviceable recovery without disassembly or reprogramming, improving serviceability and uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823TEUK+T | 5V-rated (4.50–4.75V trip), SOT-23-5, single active-low RST, no PBRST or RST | Designed for 5V systems only; lacks dual-reset and pushbutton support | Select only if migrating legacy 5V designs with no PBRST requirement and no need for active-high reset |
| TPS3808G12DBVR | 3.3V supervisor (3.06V trip), adjustable delay, open-drain RST, no PBRST or watchdog | Requires external pull-up; no integrated pushbutton interface or dual-output capability | Prefer when programmable reset delay is needed and board space allows discrete debounce circuitry |
Compared with MAX823TEUK+T and TPS3808G12DBVR, DS1819CR-20/T&R uniquely integrates pushbutton reset handling, dual active-low/active-high outputs, and ±20% 3.0V threshold in one SOT-23-5 device-reducing component count and eliminating layout compromises required by alternatives.
Availability
DS1819CR-20/T&R is available at Aetrix Electronics and suitable for industrial automation, smart metering, medical sensor nodes, and automotive body control units requiring stable component supply and long-term lifecycle assurance.
Supply support for DS1819CR-20/T&R 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 demanding industrial, automotive, and communications applications.
The DS1819CR-20/T&R belongs to the MicroMonitor™ family, engineered specifically for robust, low-power microprocessor supervision in 3.0V embedded systems where reliability under voltage transients and manual reset capability are critical.
FAQ
What is the exact VCC trip point range for DS1819CR-20/T&R?
The DS1819CR-20/T&R has a guaranteed VCC trip point range of 2.55V to 2.70V, corresponding to ±20% tolerance around a nominal 3.0V supply. This specification is validated across –40°C to +85°C and ensures consistent reset assertion during brownout conditions in 3.0V systems. The 5mV hysteresis prevents output oscillation near the threshold.
Does DS1819CR-20/T&R include a watchdog timer function?
No, DS1819CR-20/T&R does not include a watchdog timer. As a 'C' variant, it features RST (active-low), RST (active-high), and PBRST (pushbutton reset) pins-but omits the ST (strobe) input required for watchdog operation. Watchdog functionality is exclusive to 'A' and 'B' variants (e.g., DS1819AR-20/T&R or DS1819BR-20/T&R).
How does the pushbutton reset function work on DS1819CR-20/T&R?
DS1819CR-20/T&R's PBRST pin is internally pulled up to VCC (~50kΩ) and detects a low-going edge. Upon release from low, it debounces the signal and asserts both RST and RST outputs for a minimum of 140ms. This eliminates mechanical switch bounce and guarantees a clean, fixed-duration reset pulse without firmware or external components.
Can DS1819CR-20/T&R operate below 3.0V supply?
Yes, DS1819CR-20/T&R operates from 1.0V to 5.5V VCC. Its RST output remains valid down to 1.0V VCC using push-pull drive. For full 0V-to-VCC reset validity, a 100kΩ pull-down resistor from RST to GND can be added-enabling fail-safe behavior during complete power collapse, as confirmed in Figure 9 of the datasheet.
Is DS1819CR-20/T&R pin-compatible with MAX823 series devices?
DS1819CR-20/T&R is pin- and function-compatible with MAX823/824/825 devices *only in the 'A' variant configuration* (RST, GND, PBRST, ST, VCC). As a 'C' variant, DS1819CR-20/T&R substitutes ST with RST, altering pin 3's function. Direct replacement requires verifying matching variant type and confirming RST/RST usage in target design.
DS1819CR-20/T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MicroMonitor™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
DS1819CR-20/T&R FAQ
1.How can I place an order for DS1819CR-20/T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for DS1819CR-20/T&R 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 DS1819CR-20/T&R reliable?
The price and inventory of DS1819CR-20/T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS1819CR-20/T&R is usually 5 days.
3.What payment methods are accepted for DS1819CR-20/T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS1819CR-20/T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS1819CR-20/T&R?
DS1819CR-20/T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS1819CR-20/T&R 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 DS1819CR-20/T&R?
For technical support, including DS1819CR-20/T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS1819CR-20/T&R requirements.
6.How does Aetrix verify that DS1819CR-20/T&R is sourced from the original manufacturer or authorized distributors?
All DS1819CR-20/T&R 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 DS1819CR-20/T&R meets industry standards.
7.What is the process for return or replacement of DS1819CR-20/T&R?
All DS1819CR-20/T&R units undergo pre-shipment inspection (PSI). If there is an issue with DS1819CR-20/T&R, 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 DS1819CR-20/T&R part is unused and in its original packaging.
Return procedure for DS1819CR-20/T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS1819CR-20/T&R 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…
