ADM705ARZ-REEL - 4.65V Microprocessor Supervisor | Analog Devices
Артикул: ADM705ARZ-REEL ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.07 | $30,70 |
| 100 | $2.71 | $271,00 |
| 500 | $2.42 | $1.210,00 |
| 1.000 | $2.18 | $2.180,00 |
ADM705ARZ-REEL Обзор
A microprocessor supervisor (also called a voltage supervisor or reset IC) is a power-management IC that watches the system supply rail and asserts a reset signal to the host processor whenever the rail falls below a preset threshold. This prevents code execution at unsafe voltages, which can lead to corrupted flash, latched peripherals, or indeterminate logic. Supervisors sit in the power-management IC hierarchy between simple voltage detectors and full PMICs, and are essential building blocks in any MCU/MPU-based design.
Key features include a guaranteed valid RESET output with VCC as low as 1V, 190 µA typical quiescent current, a 200 ms reset pulse width, a 160 ms minimum reset timeout, and a debounced TTL/CMOS manual reset (MR) input. The reset output uses a push-pull totem-pole stage, eliminating the external pull-up resistor that open-drain alternatives require. The part is specified over the -40 °C to +85 °C industrial temperature range and ships in Pb-free/RoHS-compliant packaging.
The ADM705 family shares its pinout across the ADM705/ADM706/ADM707/ADM708 series, allowing the designer to substitute parts to trade watchdog timing, or push-pull/open-drain output polarity, without re-laying-out the PCB. This drop-in compatibility, combined with low quiescent current and 1V-reset-valid operation, makes the ADM705 a long-standing industry staple for 5V supervisory designs.
Typical applications include reset and supply monitoring for 8051, PIC, AVR, MSP430, and ARM Cortex-M microcontrollers, embedded industrial controllers, point-of-sale terminals, automotive body electronics, and battery-backed systems. The wide operating range and high noise immunity also suit it to noisy motor-control and SMPS post-regulation environments.
When designing with this device, place the 1 µF bypass capacitor as close as possible to VCC and route MR with a short, debounced trace. Note that the ADM705 does not include a watchdog timer - choose the ADM706 if watchdog functionality is required.
Аналоги без доработки для ADM705ARZ-REEL — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с ADM705ARZ-REEL (тот же форм-фактор и посадочное место) — отличается по MSL Level, Packaging, Reset Output Type.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ADM705ARZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADM705ARZ-REEL7
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADM706AR-REEL7
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADM707ARZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADM708ARZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
MAX805
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
UM706LS
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADM705ARZ-REEL Максимальные параметры и электрические характеристики
| Функция | Microprocessor Supervisory Circuit |
| Number of Voltages Monitored | 1 |
| Reset Threshold Voltage | 4.65 V |
| Reset Output Type | Push-Pull, Totem Pole |
| Reset Polarity | Active Low |
| Reset Timeout | 160 ms minimum |
| Reset Pulse Width | 200 ms |
| VCC Range (operating) | 1.0 V to 5.5 V |
| Quiescent Current (typical) | 190 µA |
| Manual Reset Input (MR) | Yes, debounced TTL/CMOS |
| Watchdog Timer | No |
| Рабочая температура | -40 °C to +85 °C |
| Корпус / Типоразмер | 8-SOIC (0.154", 3.90 mm width) |
| Packaging | Tape & Reel (REEL), 2500 pcs/reel |
| Тип монтажа | Surface Mount |
| RoHS / Lead-Free | Compliant / Yes |
| Уровень MSL | 1 |
Конфигурация выводов ADM705ARZ-REEL
| Контакт 1 | VCC — Supply voltage input (1.0 V to 5.5 V) |
| Контакт 2 | MR — Manual reset input, active-low, debounced TTL/CMOS |
| Контакт 3 | NC — Not connected (per datasheet) |
| Контакт 4 | GND — Ground |
| Контакт 5 | RESET — Active-low reset output, push-pull totem-pole |
| Контакт 6 | NC — Not connected (per datasheet) |
| Контакт 7 | NC — Not connected (per datasheet) |
| Контакт 8 | NC — Not connected on ADM705; WDI on ADM706 (per datasheet) |
Типичное применение
ADM705ARZ-REEL подходит для 7 применениеs: 5V Microcontroller Supply Supervisor, Embedded Industrial Controller Reset Circuit, Point-of-Sale Terminal Power Monitor, Battery-Backed System Brownout Protection, SMPS Post-Regulator and Power Sequencer, Automotive Body Electronics (non-monitor) Supply Watchdog, FPGA / CPLD Configuration Voltage Monitor.
5V Microcontroller Supply Supervisor
The ADM705ARZ-REEL is the canonical 5V microcontroller supervisor, watching VCC and asserting an active-low reset to the MCU whenever the rail sags below 4.65 V. With 190 µA typical quiescent current it adds negligible load to the supply, while the 200 ms reset pulse guarantees the MCU has stabilized clock and PLL before code execution begins. The push-pull output drives the reset line directly without a pull-up resistor, simplifying the BOM. Industrial temperature range (-40 °C to +85 °C) suits it to factory floor and outdoor embedded designs.
Рекомендуется
Embedded Industrial Controller Reset Circuit
Programmable logic controllers, HMI panels, and motor-control boards rely on the ADM705ARZ-REEL to ensure deterministic startup after brownouts on noisy 24V/5V industrial rails. The part's 1.0 V minimum VCC for valid RESET keeps the signal defined even during deep supply dips, while the debounced manual-reset input allows a front-panel reset button without external RC filtering. The 8-SOIC footprint is hand-solderable for low-volume industrial designs and tolerates conformal coating after assembly.
Рекомендуется
Point-of-Sale Terminal Power Monitor
POS terminals with thermal printers, mag-stripe readers, and LCD displays run multiple supply rails and must never latch up at an indeterminate voltage. The ADM705ARZ-REEL monitors the main 5V rail and asserts reset on brownout, while the push-pull output stage prevents floating reset glitches. Its 190 µA Iq keeps standby battery drain minimal during overnight idle periods, and the 4.65 V trip point accommodates USB-powered 5V supplies that sag under load. Industrial temperature grade supports the harsh thermal environment inside a printer enclosure.
Рекомендуется
Battery-Backed System Brownout Protection
Battery-backed devices such as data loggers, security panels, and metering nodes use the ADM705ARZ-REEL to bridge the transition between mains power and backup battery without losing MCU state. RESET remains valid down to VCC = 1.0 V, so the supervisor continues to assert reset as the backup battery decays, preventing code execution at unsafe voltages. The 190 µA quiescent current extends backup runtime, while the 8-SOIC footprint fits compact battery compartments. Pair with a low-Iq MCU for the longest possible shelf life.
Рекомендуется
SMPS Post-Regulator and Power Sequencer
Switch-mode power supplies often exhibit output ripple and slow transients that can fool a simple MCU brownout detector. The ADM705ARZ-REEL placed downstream of a 5V buck regulator provides a precise, temperature-stable reset threshold independent of the SMPS feedback loop. Its 1.0 V minimum VCC for valid RESET keeps the reset signal valid during cold-start before the SMPS has reached regulation, eliminating a common glitch that causes firmware lockups. Push-pull output simplifies multi-supply sequencing without external pull-ups.
Рекомендуется
Automotive Body Electronics (non-monitor) Supply Watchdog
Body-electronics modules such as door locks, seat controllers, and lighting nodes use the ADM705ARZ-REEL to monitor 5V rails derived from the 12V automotive bus. The industrial -40 °C to +85 °C temperature range covers cabin environments, and the robust 8-SOIC package withstands vibration. While not AEC-Q100 qualified, the part is widely used in non-safety-critical body controllers where a low-cost supply supervisor is acceptable. Pair with TVS diodes on the upstream 12V input for automotive transient protection.
Рекомендуется
FPGA / CPLD Configuration Voltage Monitor
FPGAs and CPLDs can latch up or corrupt configuration memory if their core or I/O rails drop below specification during programming or operation. The ADM705ARZ-REEL monitors the 5V auxiliary rail feeding an FPGA bank and asserts reset to the configuration controller on brownout. The 200 ms reset pulse width is well-matched to FPGA configuration times, and the active-low push-pull stage directly drives the CONF_DONE or RESET_B pin without a pull-up. Same-family supervision across multiple rails is straightforward by combining ADM705/ADM706 variants on the same PCB.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ADM705ARZ-REEL — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ADM706AR-REEL7 | ADM707ARZ | MAX805 | UM706LS |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices (ex-Maxim) | GigaDevice |
| Package | 8-SOIC (R-8) | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Reset Threshold | 4.65 V | 4.65 V | 4.65 V | 4.65 V | 4.65 V |
| Reset Polarity | Active Low | Active Low | Active High | Active Low | Active Low |
| Output Type | Push-Pull, Totem Pole | Push-Pull | Push-Pull | Push-Pull | Push-Pull |
| Watchdog Timer | No | Yes (1.6 s) | No | No | Yes |
| Manual Reset Input | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C | -40 °C to +85 °C |
Ключевые отличия
- Long-standing industry-standard 5V supervisor pinout (против TPS3700)
- Push-pull reset output eliminates external pull-up (против ADM805 / open-drain supervisors)
- RESET valid down to VCC = 1.0 V (против TPS3700)
- Low 190 µA quiescent current for battery-backed designs (против MAX805 (~250 µA typical))
Заметки по проектированию
Place a 1 µF (or larger) low-ESR ceramic bypass capacitor as close as possible to the VCC pin (pin 1) of the ADM705ARZ-REEL. The supervisor draws 190 µA typical quiescent current and produces brief transients when the comparator switches; a local 0.1 µF in parallel with the bulk capacitor prevents false resets caused by supply ringing during high-load steps. For battery-backed applications, choose a leakage-current-rated capacitor (X7R or film) to avoid draining the backup cell during shelf storage.
Route the manual-reset (pin 2, MR) trace away from switching converters, motor phases, and other noisy traces. Keep the trace short (< 25 mm) and add a 10 kΩ pull-up to VCC and a 100 nF cap to GND for hardware debouncing if a long front-panel cable is used. Route the RESET output (pin 5) as a short, direct trace to the MCU reset pin; add a 10 kΩ pull-up only if you are unsure whether downstream devices are configured for active-high reset (the ADM705 has internal push-pull drive and does not require external biasing).
Do not assume the ADM705ARZ-REEL provides a watchdog timer - it does not. If your firmware can hang, choose the ADM706AR (1.6 s timeout) instead. Likewise, do not assume the reset polarity is active-high; the ADM705 is active-low, while the ADM707/ADM708 are active-high variants in the same package. Finally, do not connect the NC pins (3, 6, 7, 8 on the ADM705) to anything other than what the datasheet permits; on the ADM706, pin 8 is the WDI watchdog input and leaving it floating may cause unintended behavior.
Estimated: at 5.5 V supply and 190 µA quiescent current, the ADM705ARZ-REEL dissipates approximately 1.05 mW. The 8-SOIC package has a thermal resistance around 170 °C/W, resulting in a negligible junction temperature rise (<0.2 °C) above ambient. Thermal management is not a practical concern for this part, but ensure the supply rail feeding the supervisor does not exceed the absolute maximum of 6.0 V during input transients; add a TVS diode if the upstream rail is exposed to automotive or inductive kick events.
Информация о соответствии
RoHS compliant per Analog Devices product page. Lead-free / Pb-free matte-tin finish. Not AEC-Q100 qualified - the ADM705ARZ-REEL is intended for industrial and consumer use; for AEC-Q100 automotive applications, consult Analog Devices for the automotive-grade equivalent.
