Analog Devices Inc. LTC2908CTS8-B1#TRPBF

Overview

LTC2908CTS8-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage systems. It monitors 3.3V, 2.5V, 1.8V, 1.5V, and two adjustable inputs (VADJ1/VADJ2) with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed RST operation down to 0.5V VCC - enabling reliable power-up/power-down sequencing in network servers and optical networking equipment.

For engineers reviewing the LTC2908CTS8-B1#TRPBF datasheet, LTC2908CTS8-B1#TRPBF pinout, LTC2908CTS8-B1#TRPBF application, or LTC2908CTS8-B1#TRPBF equivalent, key selection criteria include its fixed 3.3V/2.5V/1.8V/1.5V monitoring thresholds, dual ADJ inputs for custom trip points, open-drain RST output with ultralow-voltage pull-down capability, and TSOT-23-8 package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2908CTS8-B1#TRPBF implements six independent comparators referenced to a bandgap-derived 0.5V internal reference, with input-specific threshold scaling (e.g., V1 = 3.3V × 0.923 for 3.036V nominal trip). Its internal VCC auto-select logic uses the greater of V1 or V2 as the supply rail, enabling operation without an external bias source.

Reset assertion is synchronized across all six inputs via a single 200ms monostable timer; RST remains low until all monitored voltages exceed their respective thresholds for the full delay period. Glitch immunity is achieved through comparator output integration and noise filtering, eliminating need for external hysteresis or timing capacitors.

Key Specifications

Pinout & Package

8-lead TSOT-23 plastic package (3mm × 1.75mm, 1mm profile) with exposed pad not present in TSOT variant; pin 1 marked by dot, pin numbering counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G15DBVR and MAX6816EUT+T, the LTC2908CTS8-B1#TRPBF provides unique integration of four fixed thresholds plus two adjustable inputs in a single TSOT-23 package, enabling complete six-rail supervision without external components - critical for compact, high-reliability systems requiring coordinated reset timing.

Availability

LTC2908CTS8-B1#TRPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and desktop computers requiring stable component supply with guaranteed commercial-temperature performance and long-term production continuity.

Supply support for LTC2908CTS8-B1#TRPBF 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 LTC2908CTS8-B1#TRPBF belongs to the Linear Technology LTC290x family of precision voltage supervisors, engineered specifically for space-constrained multivoltage systems needing accurate, glitch-immune reset generation without external timing elements.

FAQ

What is the function of the VADJ1 and VADJ2 pins on the LTC2908CTS8-B1#TRPBF?

The VADJ1 and VADJ2 pins on the LTC2908CTS8-B1#TRPBF are adjustable voltage inputs referenced to an internal 0.5V bandgap. Each accepts a resistor divider from a target supply rail to ground, enabling custom reset thresholds from 0.6V to 12V. For example, a 100kΩ R2 and 511kΩ R1 sets a 3.055V trip point on VADJ1. This allows the LTC2908CTS8-B1#TRPBF to monitor non-standard rails beyond its four fixed thresholds.

Does the LTC2908CTS8-B1#TRPBF require external timing components for its 200ms reset delay?

No, the LTC2908CTS8-B1#TRPBF does not require external timing components. Its 200ms reset timeout is generated by an internal capacitor-based monostable circuit, eliminating the need for external RC networks. This simplifies design, reduces bill-of-materials count, and improves reliability by removing timing component tolerances and aging effects - a key advantage of the LTC2908CTS8-B1#TRPBF over legacy supervisors.

How does the LTC2908CTS8-B1#TRPBF ensure reliable reset operation during brownout conditions?

The LTC2908CTS8-B1#TRPBF guarantees RST logic-low output with VCC as low as 0.5V, using a dedicated low-voltage pull-down circuit. This prevents the RST node from floating to indeterminate voltage levels during brownout, which could trigger erroneous logic states in downstream processors. The LTC2908CTS8-B1#TRPBF maintains VOL ≤ 0.15V at RST under this condition, ensuring robust system-level fault containment.

Can multiple LTC2908CTS8-B1#TRPBF devices share a common reset line?

Yes, multiple LTC2908CTS8-B1#TRPBF devices can share a common reset line using wired-OR configuration. Their open-drain RST outputs allow direct connection to a single pull-up resistor, enabling hierarchical reset arbitration - for example, one LTC2908CTS8-B1#TRPBF supervising CPU rails and another monitoring peripheral supplies, both asserting reset on the same system RST net.

What is the operating temperature range specified for the LTC2908CTS8-B1#TRPBF?

The LTC2908CTS8-B1#TRPBF is specified for commercial temperature operation from 0°C to 70°C, as indicated by the "C" suffix in its ordering code. This range is validated for use in desktop computers, notebook systems, and network infrastructure equipment operating in controlled ambient environments. The device's ±1.5% threshold accuracy is guaranteed across this full range.