Analog Devices Inc. LTC2907ITS8#TRMPBF

Overview

LTC2907ITS8#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 margining supervision in space-constrained systems. It features ±1.5% threshold accuracy over –40°C to +85°C, open-drain RST output, and an externally programmable reset delay via TMR pin capacitor (e.g., 22nF → 200ms). Used in industrial embedded controllers requiring stable dual-rail monitoring.

For engineers reviewing the LTC2907ITS8#TRMPBF datasheet, LTC2907ITS8#TRMPBF pinout, LTC2907ITS8#TRMPBF application, or LTC2907ITS8#TRMPBF equivalent, key selection criteria include its adjustable reset timeout, guaranteed RST assertion down to V1 ≥ 1V or VCC ≥ 1V, three-state programming inputs (S1/TOL), 5%/7.5%/10% tolerance selection, and TSOT-23-8 package compatibility with high-density PCB layouts.

Technical Context

The LTC2907ITS8#TRMPBF implements two independent voltage comparators: one with a resistor-divider-programmable VADJ input referenced to a 0.5V internal bandgap (scaled per TOL setting), and another with fixed nominal thresholds (5V/3.3V/2.5V) selected via S1 pin state. Its internal VMAX logic selects the higher of V1 or VCC as the supply for reset generation and output drivers.

Reset timing is controlled by an external capacitor on the TMR pin, enabling precise delay tuning (9 ms/nF); the device guarantees correct RST logic state even when VMAX drops to 1V, and incorporates glitch immunity via comparator integration and programmable timeout - eliminating false triggers from supply noise without sacrificing threshold accuracy.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (Thin Small Outline Transistor), 2.9 mm × 1.6 mm × 0.8 mm profile, 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 LTC2907ITS8#TRMPBF uniquely supports dual simultaneous monitoring with independent threshold programming, ±1.5% accuracy, and capacitor-tuned reset timing - making it the only option for compact, high-precision dual-rail supervision in industrial and telecom equipment.

Availability

LTC2907ITS8#TRMPBF is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for LTC2907ITS8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2907ITS8#TRMPBF belongs to Linear's precision power monitoring product line, engineered specifically for high-accuracy, low-power, multi-rail supervision in space-constrained industrial, medical, and communications systems.

FAQ

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

The LTC2907ITS8#TRMPBF guarantees correct RST logic state (low during undervoltage) when either V1 ≥ 1 V or VCC ≥ 1 V. This is because internal circuitry and output drivers operate from VMAX = max(V1, VCC), and VOL remains ≤ 0.4 V at I_OL = 2.5 mA down to VMAX = 1 V - enabling reliable brownout detection in battery-backed or low-voltage systems.

How do I configure the LTC2907ITS8#TRMPBF to monitor a 1.8V supply on the VADJ pin?

To monitor 1.8V on VADJ, use a resistor divider between the 1.8V rail and GND with R2 = 100 kΩ (fixed) and R1 = 237 kΩ (1%): this yields V_ADJ = 0.500 V at 5% tolerance per the datasheet's Table 2. Connect TOL = V1 for 5% mode and ensure V1 is powered (e.g., 3.3V). The LTC2907ITS8#TRMPBF then trips when the 1.8V rail falls below 1.71 V (±1.5%).

Can the LTC2907ITS8#TRMPBF replace the LTC2906ITS8#TRMPBF on the same PCB?

No - although pin-compatible, the LTC2907ITS8#TRMPBF substitutes TMR (Pin 2) for RST (Pin 2) found on the LTC2906ITS8#TRMPBF. Swapping requires redesigning the TMR capacitor network and verifying RST timing behavior. The LTC2907ITS8#TRMPBF does not provide fixed 200ms delay; it requires external CTMR for any delay >200 µs.

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

The LTC2907ITS8#TRMPBF specifies ±25 µA maximum programming input current (IVPG) over temperature. When left floating (high-Z), leakage to V1 or GND must not exceed 10 µA per pin to avoid misprogramming - verified by measuring pin voltage in Hi-Z state (VZ = 0.7–1.1 V at ±10 µA). Exceeding this may cause incorrect threshold/tolerance selection.

Does the LTC2907ITS8#TRMPBF support wired-OR reset configurations?

Yes - the LTC2907ITS8#TRMPBF's open-drain RST output enables wired-OR connections with other supervisors or microcontrollers. However, external pull-up strength must be chosen carefully: a 10 kΩ pull-up reduces rise time to ~3.3 µs but increases required pull-down current from other devices. The LTC2907ITS8#TRMPBF's internal 6 µA pull-up remains active, so total bus pull-up is cumulative.