Analog Devices Inc. LTC6995HDCB-2#TRMPBF

Overview

LTC6995HDCB-2#TRMPBF from Analog Devices is a silicon-based programmable low-frequency oscillator IC designed for long-duration timing events in harsh environments. It delivers 1.024ms–9.54h output period (29.1µHz–977Hz), ±1.5% max frequency accuracy over –40°C to 125°C, and features active-low reset with selectable output polarity. It serves as a precision power-on reset timer or watchdog in automotive engine control units.

For engineers reviewing the LTC6995HDCB-2#TRMPBF datasheet, LTC6995HDCB-2#TRMPBF pinout, LTC6995HDCB-2#TRMPBF application, or LTC6995HDCB-2#TRMPBF equivalent, key selection criteria include its H-grade temperature range, DFN-6 package footprint, RSET-programmable period stability, and compatibility with 2.25V–5.5V single-supply systems requiring <80µA quiescent current.

Technical Context

The LTC6995HDCB-2#TRMPBF implements a master oscillator (1MHz max) controlled by SET-pin current (ISET = VSET/RSET), followed by fixed ÷1024 division and an 8-step programmable divider (NDIV = 1, 8, 64, ..., 2²¹). Its internal 4-bit A/D converter reads DIV pin voltage to set both NDIV and output polarity (POL bit).

Reset behavior is version-specific: LTC6995-2 uses active-low RST that forces OUT to a fixed state (low/high per POL) and clears internal dividers; release initiates full half-cycle delay before oscillation resumes. Start-up time is 500× master clock period (typ. 500µs at fMASTER = 2MHz), with POR activation at ~1.4V.

Key Specifications

Pinout & Package

Package: 6-lead (2mm × 3mm) plastic DFN with exposed pad (Pin 7) connected to GND. Low-profile 1mm height suitable for space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable oscillator applications.

Compared with LTC6995HDCB-1#TRMPBF, the LTC6995HDCB-2#TRMPBF enables direct interface to standard active-low microcontroller reset pins without level-shifting. Against SiT1533AI-H4-33E-32.768D, it provides 10⁹× wider period range and resistor-based field tuning-critical for adaptive watchdog and wake-up intervals.

Availability

LTC6995HDCB-2#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control, industrial safety monitors, and battery-powered IoT edge nodes requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for LTC6995HDCB-2#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The TimerBlox® family-including LTC6995HDCB-2#TRMPBF-is engineered for robust, crystal-free timing in space-, power-, and reliability-constrained systems where traditional oscillators fail.

FAQ

What is the maximum output period achievable with LTC6995HDCB-2#TRMPBF?

The LTC6995HDCB-2#TRMPBF achieves a maximum output period of 34,360 seconds (9.54 hours) when configured with NDIV = 2²¹ and RSET = 800kΩ. This value is confirmed in the Electrical Characteristics table (tOUT MAX = 34,360 seconds) and applies across the full –40°C to 125°C operating range. The device maintains ±1.5% frequency accuracy even at this extreme setting.

How does the active-low RST pin behave during power-up on LTC6995HDCB-2#TRMPBF?

During power-up, the LTC6995HDCB-2#TRMPBF's active-low RST pin holds the oscillator halted until V+ exceeds ~1.4V, then enters POR start-up. If RST remains low (asserted) at end of tSTART (~500× master clock period), OUT stays in its POL-determined state (high or low); release of RST initiates oscillation after precisely one half-period delay. This behavior is validated in Figure 3 and Figure 4 of the datasheet Rev. B.

Can LTC6995HDCB-2#TRMPBF operate from a 2.25V supply while driving a 20mA load?

Yes. The LTC6995HDCB-2#TRMPBF guarantees ±20mA output drive capability down to V+ = 2.25V, with VOL ≤ 0.26V and VOH ≥ 1.58V at IOUT = ±8mA (per Electrical Characteristics table). At 20mA sink, VOL remains ≤ 0.54V - sufficient for interfacing with 2.25V logic families. Supply current stays within 55–80µA range across all valid RSET values at this voltage.

What is the role of the exposed pad (Pin 7) in the LTC6995HDCB-2#TRMPBF DFN package?

The exposed pad (Pin 7) of the LTC6995HDCB-2#TRMPBF is internally connected to GND and must be soldered to a PCB ground plane for thermal and electrical performance. Per the Pin Configuration diagram, θJC = 9.6°C/W and θJA = 64°C/W assume proper pad connection. Omitting this connection degrades thermal dissipation and may cause junction temperature exceedance under sustained 20mA output loading.

Does LTC6995HDCB-2#TRMPBF require external components for basic operation?

Only two passive components are required for basic operation: a resistor (RSET) between SET and GND to program frequency, and a 0.1µF ceramic capacitor between V+ and GND for supply decoupling. No crystal, trimmer, or additional timing capacitors are needed - the entire timing function is integrated and resistor-programmed, as confirmed in the Typical Application schematic and FEATURES section.