Analog Devices Inc. LTC2907CTS8#TRPBF

Overview

LTC2907CTS8#TRPBF 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, housed in an 8-lead TSOT-23 package. It delivers ±1.5% threshold accuracy over temperature, 5%/7.5%/10% selectable supply tolerance, open-drain RST output, and adjustable reset delay via external capacitor - enabling robust power-up/power-down supervision in space-constrained embedded systems.

For engineers reviewing the LTC2907CTS8#TRPBF datasheet, LTC2907CTS8#TRPBF pinout, LTC2907CTS8#TRPBF application, or LTC2907CTS8#TRPBF equivalent, key selection criteria include its adjustable reset timeout (via TMR pin), guaranteed RST assertion down to V1 ≥ 1V or VCC ≥ 1V, low 54µA VCC supply current, and compatibility with noisy DC rails requiring glitch immunity and dual-supply margining.

Technical Context

The LTC2907CTS8#TRPBF implements two independent voltage comparators: one with a programmable reference (via S1/TOL pins) for standard supply rails, and another with a fixed 0.5V internal reference for adjustable monitoring via external resistor divider. Its internal VMAX logic selects the higher of V1 or VCC as the operating supply, ensuring functional reset behavior even during asymmetric power sequencing.

Reset assertion is triggered when either monitored input falls below its programmed threshold; recovery requires both inputs to remain above threshold for the full TMR-programmed delay. The TMR pin functions as a current-sink/source node (±2.1µA typical) that charges an external capacitor to set tRST = 9 ms/nF - enabling precise timing control without internal RC drift.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (3.0mm × 1.75mm × 0.9mm height), RoHS-compliant, exposed pad not present (unlike DFN variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2907CTS8#TRPBF uniquely combines pin-selectable thresholds, adjustable delay, and ±1.5% accuracy in a single TSOT-23 - eliminating external dividers while supporting margin testing and asymmetric power sequencing.

Availability

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

Supply support for LTC2907CTS8#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LTC2907 series.

The LTC2907 belongs to Linear's precision power monitoring product line, designed specifically for high-reliability embedded systems where accurate, glitch-immune dual-rail supervision is essential - especially in computing, communications, and industrial control.

FAQ

What is the maximum operating voltage for the V1 input on the LTC2907CTS8#TRPBF?

The absolute maximum rating for the V1 input on the LTC2907CTS8#TRPBF is 7V. This allows direct monitoring of higher rails like 5V or 3.3V with margin, and supports use with external resistor dividers for rails up to 12V (e.g., 12V → 1.5V via 2150k/100k divider). Operation beyond 7V risks permanent damage to the internal ESD protection structure.

Can the LTC2907CTS8#TRPBF monitor a 1.2V supply rail?

Yes - the LTC2907CTS8#TRPBF can monitor a 1.2V rail using the VADJ input with an external resistor divider. For example, connecting a 124kΩ (R1) and 100kΩ (R2) divider yields a trip point of 0.561V at VADJ, corresponding to 1.2V at the top of the divider (1.2V × 100k/(124k+100k) ≈ 0.561V). The ±1.5% threshold accuracy applies to the 0.5V internal reference, preserving overall trip-point precision.

Does the LTC2907CTS8#TRPBF require external pull-up resistors on the RST pin?

The LTC2907CTS8#TRPBF features an internal weak pull-up to VMAX (typically –6µA), so external pull-ups are optional. They are recommended only when fast rise time (<10µs) or VOH > VMAX is required. For standard microprocessor reset inputs, the internal pull-up suffices; adding a 10kΩ external resistor reduces rise time from ~86µs to ~3.3µs with 150pF load, but increases total pull-down current demand.

How does the TMR pin on the LTC2907CTS8#TRPBF set the reset delay time?

The TMR pin on the LTC2907CTS8#TRPBF sets reset delay by sinking a constant 2.1µA (typical) current into an external capacitor (CTMR) tied to GND. The resulting tRST = CTMR × 9 ms/nF relationship enables precise timing: a 22nF capacitor yields 198ms (≈200ms). Leaving TMR open gives ~200µs minimum delay. Capacitor leakage must stay below 2.1µA to prevent timing drift.

Is the LTC2907CTS8#TRPBF pin-compatible with the LTC2906CTS8#TRPBF?

Yes - the LTC2907CTS8#TRPBF and LTC2906CTS8#TRPBF share identical TSOT-23 pinouts and package dimensions. The only functional difference is that Pin 2 is labeled TMR (not RST) on the LTC2907CTS8#TRPBF and supports adjustable delay, whereas the LTC2906CTS8#TRPBF uses Pin 2 as a fixed 200ms RST output. PCBs designed for one can accommodate the other with only firmware or capacitor value changes.