Analog Devices Inc. LTC6995CS6-1#TRMPBF

Overview

LTC6995CS6-1#TRMPBF from Analog Devices is a silicon-based programmable low-frequency oscillator IC designed for long-duration timing events. It delivers 1.024ms–9.54h output periods (29.1µHz–977Hz), features active-high reset, 50% duty cycle CMOS output, and operates from 2.25V to 5.5V supply - used in power-on reset timers, watchdog circuits, and periodic wake-up systems.

For engineers reviewing the LTC6995CS6-1#TRMPBF datasheet, LTC6995CS6-1#TRMPBF pinout, LTC6995CS6-1#TRMPBF application, or LTC6995CS6-1#TRMPBF equivalent, key selection criteria include its ±1.5% frequency accuracy over temperature, 55–80µA supply current across period range, SOT-23-6 package compatibility, and programmable NDIV divider with polarity control via resistor-divider on DIV pin.

Technical Context

The LTC6995CS6-1#TRMPBF implements a master oscillator (1MHz max) controlled by SET pin current (ISET = VSET/RSET), followed by fixed ÷1024 and programmable divider (NDIV = 1, 8, 64, 512, 4096, 2¹⁵, 2¹⁸, 2²¹). Its internal 4-bit A/D converter reads DIV pin voltage to set both NDIV and output polarity (POL bit).

Reset behavior is defined by active-high RST input: assertion halts oscillation and clears dividers; release initiates full half-cycle delay before first edge. Start-up time is 500× master clock period (typ. 500µs at fMASTER = 2MHz), with POR holding OUT low until stable operation begins.

Key Specifications

Pinout & Package

Package: 6-lead TSOT-23 (S6), 1mm profile, RoHS-compliant, lead-free finish. Exposed pad not present in S6 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC6995IS6-1#TRMPBF and LTC6995CS6-2#TRMPBF, the LTC6995CS6-1#TRMPBF offers the lowest unit cost for 0°C–70°C applications with active-high reset architecture, while maintaining identical timing precision, power consumption, and PCB footprint.

Availability

LTC6995CS6-1#TRMPBF is available at Aetrix Electronics and suitable for power-on reset timers, watchdog circuits, and periodic wake-up systems requiring stable component supply, consistent long-term timing accuracy, and commercial-grade temperature performance.

Supply support for LTC6995CS6-1#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC6995CS6-1#TRMPBF belongs to the TimerBlox® family - silicon timing devices engineered for precision, low power, and ease of use in long-duration timing applications where traditional RC or crystal-based solutions lack stability or flexibility.

FAQ

What is the maximum output period achievable with the LTC6995CS6-1#TRMPBF?

The LTC6995CS6-1#TRMPBF supports a maximum output period of 34,360 seconds (9.54 hours), achieved using RSET = 800kΩ and NDIV = 2²¹. This value is confirmed in the Electrical Characteristics table under tOUT MAX and applies across the full 0°C to 70°C operating range with ±2.2% accuracy.

How does the RST pin function on the LTC6995CS6-1#TRMPBF?

The RST pin on the LTC6995CS6-1#TRMPBF is active-high: driving it high halts the master oscillator and clears internal dividers, forcing OUT into a fixed state determined by the POL bit. Releasing RST (driving low) initiates oscillation after a precise half-period delay - a behavior verified in Figure 3 and Table "OUTPUT (OSCILLATOR START STATE)" of the datasheet.

Can the LTC6995CS6-1#TRMPBF drive an LED directly?

Yes, the LTC6995CS6-1#TRMPBF can drive an LED directly via its CMOS output, which sources/sinks up to ±20mA. To limit current, a series resistor must be used: for a 3.3V supply and red LED (VF ≈ 1.8V), a 75Ω resistor limits current to ~20mA. This capability is specified in the Electrical Characteristics table under IOUT(MAX) and VOH/VOL.

What is the recommended RSET resistor tolerance for ±1.5% frequency accuracy?

To achieve the datasheet-specified ±1.5% frequency accuracy, a 0.5% tolerance metal film or thin-film resistor with ≤50ppm/°C temperature coefficient is recommended for RSET. The datasheet explicitly states this in the "SET" pin description: "For best performance, use a precision metal or thin film resistor of 0.5% or better tolerance…"

Does the LTC6995CS6-1#TRMPBF require an external crystal or resonator?

No, the LTC6995CS6-1#TRMPBF is a fully self-contained silicon oscillator and requires no external crystal, resonator, or timing capacitor. All timing is generated internally using a master oscillator controlled by RSET and DIV pin resistor networks - a core feature emphasized in the "DESCRIPTION" and "FEATURES" sections of the datasheet.