Analog Devices Inc. LTC2907IDDB#TRPBF

Overview

LTC2907IDDB#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 multi-rail systems. It features ±1.5% threshold accuracy over –40°C to +85°C, open-drain RST output, and externally programmable reset delay via TMR pin capacitor (e.g., 22nF → 200ms). Used in desktop/notebook computers and network servers for core/I/O voltage supervision.

For engineers reviewing the LTC2907IDDB#TRPBF datasheet, LTC2907IDDB#TRPBF pinout, LTC2907IDDB#TRPBF application, or LTC2907IDDB#TRPBF equivalent, key selection criteria include guaranteed RST assertion down to V1 ≥ 1V or VCC ≥ 1V, three supply tolerance options (5%/7.5%/10%), internal VCC auto-select, glitch immunity, and DFN-8 (3mm × 2mm) package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2907IDDB#TRPBF implements two independent comparators-one with a resistor-programmable VADJ input referenced to an internal 0.5V bandgap, and another with S1-selectable thresholds (5V/3.3V/2.5V)-both sharing a common open-drain RST output. Threshold accuracy is maintained at ±1.5% across temperature via trimmed internal resistive networks and a stable bandgap reference.

Reset timing is controlled by an external capacitor on the TMR pin, enabling precise delay tuning (9 ms/nF); the internal timer circuit ensures robust noise rejection through comparator integration and programmable timeout, eliminating spurious resets without sacrificing threshold precision. Power detection logic uses VMAX = max(V1, VCC) as the internal supply, guaranteeing correct RST state down to 1V.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), exposed pad (Pin 9) soldered to GND 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 LTC2907CDDB#TRPBF and TPS3808G33DBVR, the LTC2907IDDB#TRPBF uniquely delivers industrial-temperature operation, dual independently configurable inputs, and programmable reset timing - making it the sole option for robust, space-efficient dual-rail supervision in demanding embedded systems.

Availability

LTC2907IDDB#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and handheld devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2907IDDB#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 high-performance analog/mixed-signal product lines, including precision power monitoring ICs.

The LTC2907IDDB#TRPBF belongs to Linear's LTC® supervisor family, engineered for high-accuracy, low-power, multi-rail voltage monitoring in computing, communications, and industrial systems where reliability under voltage stress is critical.

FAQ

What is the operating temperature range of the LTC2907IDDB#TRPBF?

The LTC2907IDDB#TRPBF is rated for industrial operation from –40°C to +85°C. This range is confirmed in the official datasheet ordering information table and distinguishes it from the commercial-grade LTC2907CDDB#TRPBF (0°C to 70°C). The specification applies to all electrical characteristics including threshold accuracy, reset delay, and supply current.

How does the TMR pin on the LTC2907IDDB#TRPBF set reset delay time?

The TMR pin on the LTC2907IDDB#TRPBF accepts an external capacitor to ground to program reset delay: tRST = 9 ms/nF. For example, a 22nF capacitor yields 198ms ≈ 200ms. Leaving TMR open results in ~200µs minimum delay. The relationship is linear and specified across temperature; leakage current of the capacitor must remain below 2.1µA to avoid timing drift.

Can the LTC2907IDDB#TRPBF monitor a 1.2V supply?

Yes - the LTC2907IDDB#TRPBF monitors custom voltages via the VADJ pin using an external resistor divider. With VADJ referenced to 0.5V and 10% tolerance, a 1.2V rail can be scaled to 0.5V at the pin using R1 = 100kΩ and R2 = 71.5kΩ (1% values). Table 2 in the datasheet provides validated resistor pairs for trip points from 0.6V to 12V.

What is the minimum supply voltage required for the LTC2907IDDB#TRPBF to assert a valid RST signal?

The LTC2907IDDB#TRPBF guarantees correct RST logic state (low when asserted) for V1 ≥ 1V or VCC ≥ 1V. This is explicitly stated in the "Guaranteed RST for V1 ≥ 1V or VCC ≥ 1V" feature and verified in Electrical Characteristics (VMAX(MIN) = 1V). Below 1V, RST behavior is undefined.

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

The LTC2907IDDB#TRPBF includes a weak internal pull-up to VMAX (~6µA), sufficient for most applications. An external pull-up is recommended only when fast rise time (<10µs) or VOH > VMAX is required, or when RST must remain valid at very low VMAX (e.g., near 1V), where internal pull-up strength diminishes. Typical designs use 10kΩ–100kΩ external resistors.