Analog Devices Inc. LTC2907CTS8#TRMPBF

Overview

LTC2907CTS8#TRMPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with one pin-selectable threshold input (5V/3.3V/2.5V) and one adjustable 0.5V input, featuring ±1.5% threshold accuracy over temperature, 5%/7.5%/10% selectable supply tolerance, and an externally programmable reset delay via TMR pin capacitor. It delivers reliable power-up/power-down/brownout reset assertion for multi-rail systems in space-constrained applications.

For engineers reviewing the LTC2907CTS8#TRMPBF datasheet, LTC2907CTS8#TRMPBF pinout, LTC2907CTS8#TRMPBF application, or LTC2907CTS8#TRMPBF equivalent, this page provides verified technical context, exact pin functions, real-world timing behavior, confirmed alternative options, and supply-chain support details specific to the TSOT-23-8 package and C-grade (0°C to 70°C) version.

Technical Context

The LTC2907CTS8#TRMPBF implements two independent comparators-one with a resistor-programmable VADJ input referenced to a 0.5V internal bandgap, and another with a three-state S1-configurable V1 input (5V/3.3V/2.5V nominal). Both share a common open-drain RST output and use the same VMAX-supplied logic (greater of V1 or VCC), enabling operation down to 1V on either supply.

Reset timing is controlled exclusively by the TMR pin: an external capacitor (e.g., 22nF for 200ms) sets the delay, while leaving TMR open yields ~200µs. Unlike the LTC2906, it lacks fixed 200ms internal timing and instead relies on capacitor-based adjustment with 9ms/nF scaling, supported by glitch-immune comparator outputs and integrated low-pass filtering.

Key Specifications

Pinout & Package

TSOT-23-8 plastic package (3mm × 1.75mm body, 1mm max height), exposed pad not present; pin 1 marked with dot or bevel; requires standard reflow profile per JEDEC MO-193.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2907CTS8#TRMPBF, the LTC2907IDDB#TRPBF offers wider temperature range in a physically larger package, while the TPS3808G33DBVR sacrifices dual-input flexibility for lower cost and smaller size in single-rail applications-neither is pin-compatible, and both require PCB redesign.

Availability

LTC2907CTS8#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and network servers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2907CTS8#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 acquired Linear Technology in 2017 and maintains full backward compatibility for all Linear-supervised products, including precision analog and power management ICs.

The LTC2907CTS8#TRMPBF belongs to Linear's legacy supervisor IC family, designed specifically for high-accuracy, low-power dual-rail monitoring in computing and communications infrastructure where supply margining and glitch immunity are critical.

FAQ

What is the minimum operating voltage required for LTC2907CTS8#TRMPBF to assert a valid RST signal?

The LTC2907CTS8#TRMPBF guarantees correct RST output state (low) when either V1 ≥ 1V or VCC ≥ 1V. This enables reliable reset assertion during brownout conditions where supplies dip below nominal but remain above 1V-critical for orderly shutdown in systems with decoupled power domains. Below 1V, RST behavior is undefined.

How does the TMR pin on LTC2907CTS8#TRMPBF determine reset delay time?

The TMR pin on LTC2907CTS8#TRMPBF accepts an external capacitor to ground, with reset timeout tRST = CTMR × 9ms/nF. For example, a 22nF capacitor yields ~200ms delay. Leaving TMR open results in ~200µs minimum delay. The relationship is linear and specified across temperature, enabling precise timing control without internal RC variation.

Can LTC2907CTS8#TRMPBF monitor a 1.2V supply using the VADJ input?

Yes-the LTC2907CTS8#TRMPBF VADJ input supports adjustable thresholds down to 0.5V nominal, and with appropriate resistor divider design (e.g., 124kΩ/100kΩ for 1.2V → 0.5V), it can accurately monitor 1.2V supplies. Threshold accuracy remains ±1.5% of the programmed trip point (e.g., ±18mV for 1.2V), validated over 0°C to 70°C.

What is the purpose of the three-state S1 and TOL pins on LTC2907CTS8#TRMPBF?

The S1 and TOL pins on LTC2907CTS8#TRMPBF are three-state inputs that eliminate external configuration resistors: S1 selects V1 threshold (5V/3.3V/2.5V) by connecting to V1, leaving open, or tying to GND; TOL selects tolerance (5%/7.5%/10%) similarly. This enables flexible factory or field configuration without soldered components or PCB revisions.

Does LTC2907CTS8#TRMPBF support wired-OR reset bus configurations?

Yes-the LTC2907CTS8#TRMPBF RST output is open-drain, allowing direct wired-OR connection with other reset sources (e.g., watchdog timers, manual reset buttons). Its weak internal pull-up to VMAX permits shared bus operation, while strong pull-down ensures dominant low-state assertion. External pull-up value must accommodate total bus capacitance and required rise time.