Analog Devices Inc. LTC2907IDDB#TRMPBF

Overview

LTC2907IDDB#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, designed for reliable power-up, brownout, and reset supervision in multi-rail systems. It features ±1.5% threshold accuracy over –40°C to +85°C, adjustable reset timeout via external capacitor (e.g., 200ms with 22nF), open-drain RST output, and guaranteed operation down to V_MAX = 1V. Used in notebook computers, network servers, and industrial embedded controllers requiring tight voltage margining.

For engineers reviewing the LTC2907IDDB#TRMPBF datasheet, LTC2907IDDB#TRMPBF pinout, LTC2907IDDB#TRMPBF application, or LTC2907IDDB#TRMPBF equivalent, this page delivers verified specifications, DFN-8 package layout, real-world timing behavior, tolerance programming logic, and validated alternatives - all grounded in the official 29067f datasheet and Linear/Analog Devices product documentation.

Technical Context

The LTC2907IDDB#TRMPBF implements two independent comparators: one with a programmable reference (via S1/TOL pins) for V1 (5V/3.3V/2.5V), and another with a fixed 0.5V internal reference for V_ADJ, both scaled by user-selected tolerance (5%/7.5%/10%). Its reset pulse generator uses an external capacitor on the TMR pin to set delay time (9 ms/nF), enabling precise system-level reset coordination without internal RC drift.

Internal V_MAX = max(V1, VCC) powers both comparator circuitry and the open-drain RST driver, ensuring valid reset assertion even during auxiliary-supply-only operation. The three-state S1 and TOL inputs eliminate external resistors while maintaining ±1.5% threshold accuracy across temperature, and glitch immunity is achieved via integrated low-pass filtering and mandatory timeout validation before RST deassertion.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), exposed pad (Pin 9) soldered to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2906IDDB#TRMPBF, the LTC2907IDDB#TRMPBF trades fixed timing for capacitor-adjustable delay and adds TMR pin functionality; versus TPS3808G33DBVR, it provides true dual-rail supervision, ±1.5% accuracy, and programmable tolerance - making it superior for precision multi-voltage systems.

Availability

LTC2907IDDB#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, industrial embedded controllers, and handheld devices requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature operation.

Supply support for LTC2907IDDB#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 technical and manufacturing continuity for all Linear precision analog products.

The LTC2907IDDB#TRMPBF belongs to Linear's high-accuracy power supply monitoring IC family, engineered specifically for mission-critical voltage supervision in computing, communications, and industrial systems where reset reliability and tight threshold tolerance are non-negotiable.

FAQ

What is the function of the TMR pin on the LTC2907IDDB#TRMPBF?

The TMR pin on the LTC2907IDDB#TRMPBF is the reset timeout programming terminal. Connecting an external capacitor (CTMR) between TMR and GND sets the reset delay time using the formula t_RST = CTMR × 9 ms/nF - for example, 22nF yields 200ms. Leaving TMR open results in ~200µs minimum delay. This pin replaces the fixed 200ms timer found in the LTC2906IDDB#TRMPBF and enables precise system-level reset coordination.

How does the LTC2907IDDB#TRMPBF guarantee RST operation when V1 or VCC drops below 2V?

The LTC2907IDDB#TRMPBF guarantees RST logic state integrity down to V_MAX = 1V, where V_MAX = max(V1, VCC). At V_MAX ≥1V, the RST output is specified to sink ≥2.5mA while maintaining VOL ≤0.4V (per Electrical Characteristics table). This ensures clean reset assertion during brownout conditions - a key differentiator from supervisors requiring ≥2.7V for valid output drive.

Can the LTC2907IDDB#TRMPBF monitor a 1.2V supply, and how is the threshold set?

Yes, the LTC2907IDDB#TRMPBF can monitor a 1.2V supply using its adjustable V_ADJ input. Connect the 1.2V rail to V_ADJ via a resistor divider that scales it to 0.5V - for example, use R1 = 140kΩ and R2 = 100kΩ (per Table 2 in datasheet). The internal comparator then triggers when the divided voltage falls below 0.5V ±1.5%, corresponding to 1.2V × (0.5V/1.2V) = 0.5V at the input.

What are the valid connections for the S1 and TOL pins on the LTC2907IDDB#TRMPBF?

The S1 and TOL pins on the LTC2907IDDB#TRMPBF are three-state inputs. Valid connections are: tied to V1 (for 5% tolerance or 5V V1 mode), tied to GND (for 10% tolerance or 2.5V V1 mode), or left open (for 7.5% tolerance or 3.3V V1 mode). Leakage current must remain <10µA in open state (per datasheet Note 6). Driving them with a three-state buffer is permitted if VIH ≥1.4V and VIL ≤0.4V.

Does the LTC2907IDDB#TRMPBF require external pull-up resistors on the RST pin?

The LTC2907IDDB#TRMPBF includes a weak internal pull-up to V_MAX (~6µA typical), eliminating external pull-ups when rise time is non-critical. However, for faster rise (e.g., <10µs) or higher VOH (>V_MAX), a 10kΩ external pull-up is recommended. In wired-OR configurations, ensure total pull-up strength (internal + external) is overcome by any single device's pull-down capability - per datasheet Figure G19.