Analog Devices Inc. ADM809RAKS-REEL7

Overview

ADM809RAKS-REEL7 from Analog Devices is a microprocessor supervisory circuit in 3-lead SC70 package, providing push-pull active-low RESET output with 2.63 V reset threshold, 140–460 ms power-on reset timeout, and operation down to 1.0 V VCC. It monitors supply voltage in embedded microcontroller systems requiring reliable brownout detection and low-power reset assertion.

For engineers reviewing the ADM809RAKS-REEL7 datasheet, ADM809RAKS-REEL7 pinout, ADM809RAKS-REEL7 application, or ADM809RAKS-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over −40°C to +125°C), ultra-low quiescent current (17 μA typical), push-pull drive capability (3.2 mA sink), SC70 footprint compatibility, and guaranteed reset assertion below 1 V VCC.

Technical Context

The ADM809RAKS-REEL7 integrates a precision voltage comparator with built-in glitch immunity and an internal 240 ms (typical) reset timer. Its reset threshold is trimmed to 2.63 V at 25°C with ±2.5% tolerance across −40°C to +125°C and 30 ppm/°C temperature coefficient.

It features a push-pull RESET output capable of sinking 3.2 mA at V_{TH min}, with logic-low voltage ≤0.4 V and logic-high voltage ≥0.8×V_CC. The device operates continuously from V_CC = 1.0 V to 5.5 V and consumes only 17 μA at V_CC < 3.6 V and T_A = −40°C to +85°C.

Key Specifications

Pinout & Package

ADM809RAKS-REEL7 uses a 3-lead SC70 (KS-3) package, 2.00 mm × 2.10 mm × 0.95 mm, with gull-wing leads and JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2T and TPS3808G12QDBVRQ1, ADM809RAKS-REEL7 uniquely combines 2.63 V fixed threshold, guaranteed 1.0 V operation, SC70 footprint, and 17 μA typical supply current - making it optimal for space-constrained industrial controllers needing robust brownout immunity without external components.

Availability

ADM809RAKS-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM809RAKS-REEL7 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADM809RAKS-REEL7 belongs to the ADM803/ADM809/ADM810 family of microprocessor supervisory circuits, designed specifically for reliable power monitoring and reset generation in resource-constrained embedded systems operating across harsh industrial and automotive environments.

FAQ

What is the exact reset threshold voltage of ADM809RAKS-REEL7 and how does it vary with temperature?

The ADM809RAKS-REEL7 has a nominal reset threshold of 2.63 V at 25°C, with a guaranteed range of 2.55 V to 2.70 V over −40°C to +85°C and 2.52 V to 2.74 V over −40°C to +125°C. Its temperature coefficient is 30 ppm/°C, meaning threshold drift is bounded and predictable - critical for designs where supply margin must be maintained across extreme ambient conditions. This specification is confirmed in Table 1 and Table 3 of the ADM803/ADM809/ADM810 datasheet Rev. I.

Does ADM809RAKS-REEL7 support operation below 1.2 V VCC, and what happens to the RESET output at low voltage?

Yes, ADM809RAKS-REEL7 is fully specified to operate down to 1.0 V VCC. As VCC falls below the 2.63 V threshold, the RESET output transitions to and remains in active-low state. Even when VCC drops to 1.0 V, the output retains its ability to sink current and maintain a valid logic-low level - ensuring continuous reset assertion during deep brownout. This behavior is explicitly documented in the General Description and Absolute Maximum Ratings sections.

Is ADM809RAKS-REEL7 pin-compatible with other parts in the ADM803/ADM809/ADM810 family?

ADM809RAKS-REEL7 shares identical 3-lead SC70 (KS-3) pinout with all ADM809 variants and ADM803 variants in SC70 packages: Pin 1 = GND, Pin 2 = RESET, Pin 3 = VCC. However, it is not pin-compatible with ADM810 (which swaps RESET and GND pins) or with SOT-23-packaged versions that share the same marking but differ in lead pitch and body dimensions. Mechanical compatibility requires verifying land pattern against KS-3 outline in Figure 15.

What is the minimum reset timeout duration for ADM809RAKS-REEL7, and is it guaranteed over temperature?

The ADM809RAKS-REEL7 guarantees a minimum reset timeout of 140 ms over −40°C to +85°C, with typical value of 240 ms and maximum of 460 ms in that range. At higher temperatures (85°C to 125°C), the minimum drops to 100 ms and maximum increases to 840 ms. These values are fully characterized and appear in the "RESET ACTIVE TIMEOUT PERIOD" row of Table 1, confirming deterministic timing behavior essential for MCU boot sequencing.

Can ADM809RAKS-REEL7 drive a standard CMOS microcontroller reset input directly, and what are the drive specifications?

Yes, ADM809RAKS-REEL7 features a push-pull RESET output capable of sinking 3.2 mA at V_{TH min} while maintaining V_OL ≤ 0.4 V, and sourcing current to achieve V_OH ≥ 0.8×V_CC. This meets standard CMOS input requirements (e.g., STM32, PIC, MSP430) without external pull-up resistors. The output is electrically compatible with 1.8 V, 2.5 V, 3.3 V, and 5 V logic families as confirmed in the "RESET OUTPUT VOLTAGE LOW/HIGH" specifications in Table 1.