Analog Devices Inc. ADM6319B25ARJZ-R7

Overview

ADM6319B25ARJZ-R7 from Analog Devices is a supervisory circuit with manual reset and dual push-pull reset outputs, designed for microprocessor supply voltage monitoring. It features a 2.5 V reset threshold (±2.5% over −40°C to +85°C), 20 ms minimum reset timeout, no watchdog timer, 5 µA typical supply current, and guaranteed reset validity down to VCC = 1 V. It is used in portable embedded systems requiring reliable power-on and brownout reset control.

For engineers reviewing the ADM6319B25ARJZ-R7 datasheet, ADM6319B25ARJZ-R7 pinout, ADM6319B25ARJZ-R7 application, or ADM6319B25ARJZ-R7 equivalent, key selection criteria include reset threshold accuracy, industrial temperature operation, dual active-low/active-high output capability, manual reset input with internal 52 kΩ pull-up, and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The ADM6319B25ARJZ-R7 implements a precision bandgap-based voltage reference and comparator to monitor VCC against a fixed 2.5 V threshold. Its reset generator asserts both RESET and RESET outputs simultaneously when VCC falls below threshold or when the MR input is pulled low for ≥1 µs - with propagation delay of 230 ns at VCC = 5 V.

Unlike watchdog-equipped variants (e.g., ADM6316–ADM6318), this part omits the WDI pin and associated timing circuitry, simplifying firmware integration while retaining dual-output flexibility. The push-pull architecture ensures rail-to-rail logic levels without external pull-ups, supporting direct interface to microcontrollers with either active-low or active-high reset inputs.

Key Specifications

Pinout & Package

ADM6319B25ARJZ-R7 is housed in a 5-lead SOT-23 package (JEDEC MO-178-AA compliant), measuring 2.90 mm × 1.60 mm × 1.15 mm, with gull-wing leads and 0.95 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with ADM6317B25ARJZ-R7 and TPS3808G125DBVR, ADM6319B25ARJZ-R7 uniquely delivers dual push-pull outputs in the same SOT-23-5 footprint, enabling direct interface to heterogeneous reset domains without external components or level translation - a key advantage in space- and reliability-critical embedded systems.

Availability

ADM6319B25ARJZ-R7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply and long-term industrial lifecycle support.

Supply support for ADM6319B25ARJZ-R7 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM63xx family was engineered specifically for robust microprocessor supervision in space-constrained, low-power, and thermally demanding environments - emphasizing precision threshold accuracy, ultra-low quiescent current, and dual-output flexibility.

FAQ

What is the reset threshold voltage tolerance of ADM6319B25ARJZ-R7 over temperature?

The ADM6319B25ARJZ-R7 has a reset threshold of 2.5 V with ±2.5% tolerance over the full industrial temperature range of −40°C to +85°C. At 25°C, the tolerance tightens to ±1.5%. This ensures consistent brownout detection across operating conditions without requiring calibration or external trimming components.

Does ADM6319B25ARJZ-R7 include a watchdog timer function?

No, ADM6319B25ARJZ-R7 does not include a watchdog timer. Per the ordering guide and device selection table, it belongs to the ADM6319 series, which is defined as "No watchdog, Yes manual reset, Push-pull/Push-pull output." The WDI pin is omitted; only VCC, GND, MR, RESET, and RESET are present.

What is the maximum supply voltage the ADM6319B25ARJZ-R7 can monitor?

The ADM6319B25ARJZ-R7 monitors VCC over a range of 1 V to 5.5 V. Its absolute maximum rating is 6 V, but operation above 5.5 V is not specified. The 2.5 V reset threshold remains accurate and stable across this full operating range, including during power-up from 1 V.

How does the manual reset (MR) input behave electrically on ADM6319B25ARJZ-R7?

The MR input on ADM6319B25ARJZ-R7 is active low with an internal 52 kΩ pull-up resistor. Its threshold is 0.3 × VCC to 0.7 × VCC (for VTH < 4.0 V), and it rejects glitches shorter than 100 ns. A low pulse ≥1 µs triggers reset assertion, and reset remains active for the full 20 ms timeout after MR returns high.

Can ADM6319B25ARJZ-R7 drive both microcontroller and FPGA reset inputs simultaneously?

Yes, ADM6319B25ARJZ-R7 can drive both simultaneously: its active-low RESET output connects directly to microcontrollers requiring low-active reset, while its active-high RESET output interfaces natively with FPGAs or ASICs specifying high-active reset. Each output is push-pull, capable of sinking 1.2 mA or sourcing 500 µA, eliminating need for external buffers or level shifters.