Analog Devices Inc. LTC2907ITS8#TRPBF

Overview

LTC2907ITS8#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, designed for reliable power-up/power-down/brownout detection in space-constrained systems. It features ±1.5% threshold accuracy over –40°C to +85°C, adjustable reset delay via external capacitor (e.g., 200ms with 22nF), open-drain RST output, and guaranteed operation down to V1 ≥ 1V or VCC ≥ 1V. Used in industrial embedded controllers requiring robust supply supervision.

For engineers reviewing the LTC2907ITS8#TRPBF datasheet, LTC2907ITS8#TRPBF pinout, LTC2907ITS8#TRPBF application, or LTC2907ITS8#TRPBF equivalent, key selection criteria include its adjustable reset timeout, three tolerance options (5%/7.5%/10%), dual-input monitoring architecture, low quiescent current (≤100µA), and TSOT-23-8 package compatibility with high-density PCB layouts.

Technical Context

The LTC2907ITS8#TRPBF implements two independent voltage comparators: one with a programmable reference (via S1 pin) selecting nominal thresholds of 5V, 3.3V, or 2.5V; the other with a fixed 0.5V reference applied to VADJ, scaled by TOL pin selection (5%/7.5%/10%). Internal bandgap reference ensures ±1.5% accuracy across temperature.

Reset assertion is controlled by an internal timer whose delay is set by an external capacitor on the TMR pin (9ms/nF scaling), enabling precise timing control from ~200µs to seconds. The RST output is open-drain with weak internal pull-up to VMAX (max(V1,VCC)) and strong pull-down, guaranteeing valid logic states even when VMAX = 1V.

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 LTC2907CTS8#TRPBF, the LTC2907ITS8#TRPBF provides extended temperature reliability essential for industrial equipment, while TPS3808G33DBVR offers lower cost at the expense of dual-supply capability and timing adjustability - making LTC2907ITS8#TRPBF optimal for complex, thermally demanding multi-rail supervision.

Availability

LTC2907ITS8#TRPBF is available at Aetrix Electronics and suitable for industrial automation controllers, network infrastructure equipment, and medical diagnostic devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2907ITS8#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 its precision analog portfolio, focusing on high-performance signal conditioning, power management, and interface ICs for demanding applications.

The LTC2907ITS8#TRPBF belongs to Linear's precision supply monitor product line, engineered specifically for systems requiring simultaneous multi-rail supervision with factory-trimmed accuracy, minimal external components, and robust noise immunity in harsh electrical environments.

FAQ

What is the minimum supply voltage required for LTC2907ITS8#TRPBF to assert a valid RST signal?

The LTC2907ITS8#TRPBF guarantees correct RST logic state (low) when either V1 ≥ 1V or VCC ≥ 1V, regardless of the other supply. This ensures reliable reset assertion during deep brownout conditions where main rails collapse below nominal levels. The internal VMAX = max(V1,VCC) powers the output driver, so RST remains functional down to 1V on either input.

How do I configure LTC2907ITS8#TRPBF to monitor a 1.8V supply using the VADJ input?

To monitor 1.8V with LTC2907ITS8#TRPBF, connect it to VADJ via a resistor divider that scales 1.8V down to 0.5V (nominal). For 5% tolerance, use R1 = 237kΩ and R2 = 100kΩ (per Table 2 in datasheet). Ensure the divider's Thevenin impedance is low enough to avoid loading errors, and bypass VADJ with 0.1µF to ground for noise immunity.

Can LTC2907ITS8#TRPBF replace LTC2906ITS8#TRPBF in an existing design?

Yes, LTC2907ITS8#TRPBF is pin-compatible with LTC2906ITS8#TRPBF in the same TSOT-23-8 package, but replaces the fixed 200ms reset delay with adjustable timing via the TMR pin. To retain identical timing, connect a 22nF capacitor from TMR to GND. All other pin functions, thresholds, and accuracy specs are identical between the two parts.

What is the maximum leakage current allowed on the S1 and TOL pins of LTC2907ITS8#TRPBF?

The S1 and TOL pins of LTC2907ITS8#TRPBF are three-state inputs with maximum allowable leakage current of ±10µA when left unconnected (open state). This specification ensures reliable logic level interpretation without unintended threshold shifts. If driven by a buffer, ensure its high-impedance state meets this leakage limit to prevent misprogramming.

Does LTC2907ITS8#TRPBF require external pull-up resistors on the RST pin?

LTC2907ITS8#TRPBF includes a weak internal pull-up to VMAX (~6µA typical), sufficient for most applications where rise time is non-critical. However, an external pull-up (e.g., 10kΩ–100kΩ) is recommended if fast rise time, higher VOH, or wired-OR bus driving is required - especially when VMAX is near 1V, where internal pull-up strength diminishes significantly.