Analog Devices Inc. LTC2908IDDB-C1#TRMPBF

Overview

LTC2908IDDB-C1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply monitor IC designed for multivoltage systems requiring tight threshold accuracy and ultralow-voltage reset operation. It monitors V1 plus five adjustable inputs (VADJ1–VADJ5) with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed RST assertion down to VCC = 0.5V. It is used in optical networking systems and desktop computers for reliable power-on reset and brownout detection.

For engineers reviewing the LTC2908IDDB-C1#TRMPBF datasheet, LTC2908IDDB-C1#TRMPBF pinout, LTC2908IDDB-C1#TRMPBF application, or LTC2908IDDB-C1#TRMPBF equivalent, key selection criteria include its 2.5V nominal monitoring configuration, five 0.5V-adjustable thresholds, DFN-8 package compatibility, and guaranteed low-voltage RST pull-down capability below 1V - critical for robust system initialization in high-density embedded designs.

Technical Context

The LTC2908IDDB-C1#TRMPBF implements six independent comparators referenced to a bandgap-derived 0.5V internal reference, each with built-in glitch immunity via first-order low-pass filtering. Its reset logic requires all six inputs to remain above threshold for 200ms before releasing RST, eliminating false triggers from transient supply noise.

V1 serves exclusively as the internal supply (VCC), powering all circuitry; no V2 input is used in the C1 variant. All five adjustable inputs (VADJ1–VADJ5) share identical 0.492V to 0.508V threshold specification and ±15nA input current, enabling precise external resistor-divider-based monitoring of diverse rail voltages from 0.6V to 12V.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), 1mm profile, exposed pad (Pin 9, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supply monitor applications.

Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2908IDDB-C1#TRMPBF uniquely delivers five independently adjustable thresholds in a single DFN-8 package, enabling comprehensive multirail monitoring without external resistors on fixed-threshold pins or multiple ICs.

Availability

LTC2908IDDB-C1#TRMPBF is available at Aetrix Electronics and suitable for optical networking systems, desktop computers, and multivoltage embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC2908IDDB-C1#TRMPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2908 product line delivers precision, low-power, multirail supply monitoring ICs optimized for telecom infrastructure, computing platforms, and industrial equipment where reliability and accuracy under varying thermal conditions are critical.

FAQ

What is the exact threshold voltage for each adjustable input on the LTC2908IDDB-C1#TRMPBF?

Each adjustable input (VADJ1 through VADJ5) on the LTC2908IDDB-C1#TRMPBF has a nominal threshold of 0.500V, with a guaranteed range of 0.492V to 0.508V over the full operating temperature range (–40°C to +85°C). This tight ±1.5% tolerance enables accurate rail monitoring when used with standard 1% resistor dividers, as specified in the official datasheet's Electrical Characteristics table for the LTC2908-C1 variant.

Does the LTC2908IDDB-C1#TRMPBF require an external timing capacitor for its 200ms reset timeout?

No, the LTC2908IDDB-C1#TRMPBF does not require an external timing capacitor. Its 200ms reset timeout (160ms to 260ms guaranteed) is generated by an internal capacitor, eliminating the need for external components and reducing design complexity. This feature is explicitly confirmed in the Applications Information section of the datasheet and applies identically to the LTC2908IDDB-C1#TRMPBF variant.

Can the LTC2908IDDB-C1#TRMPBF monitor a 1.2V rail, and how is it configured?

Yes, the LTC2908IDDB-C1#TRMPBF can monitor a 1.2V rail using any of its five adjustable inputs (VADJ1–VADJ5). Configure it with a resistor divider where the tap point connects to the VADJ pin and the divider ratio yields 0.5V at the pin when the rail is at 1.2V. For example, with R2 = 100kΩ, R1 ≈ 124kΩ (per Table 1 in the datasheet), delivering precise trip-point alignment without calibration.

What is the minimum supply voltage required for the LTC2908IDDB-C1#TRMPBF to guarantee correct RST output behavior?

The LTC2908IDDB-C1#TRMPBF guarantees correct RST output behavior - specifically, a valid logic-low state - when V1 (its sole internal supply) is ≥0.5V. Below this, RST may float or become indeterminate. This ultralow-voltage capability is a defining feature of the LTC2908IDDB-C1#TRMPBF and is validated across the –40°C to +85°C temperature range per the Absolute Maximum Ratings and Electrical Characteristics tables.

How does the LTC2908IDDB-C1#TRMPBF handle power-down sequencing in multirail systems?

During power-down, the LTC2908IDDB-C1#TRMPBF asserts RST low as soon as any monitored input (V1 or any VADJx) drops below its threshold. Because V1 powers the IC, RST remains actively pulled low down to V1 = 0.5V, ensuring clean system reset even during asymmetric rail collapse. This behavior is documented in the Power-Down section of the Applications Information and distinguishes the LTC2908IDDB-C1#TRMPBF from supervisors requiring higher minimum VCC.