Analog Devices Inc. LTC6994IS6-1#WTRMPBF

Overview

LTC6994IS6-1#WTRMPBF from Analog Devices is a TimerBlox® programmable delay block optimized for rising- or falling-edge signal qualification in automotive-grade applications. It delivers 1µs–33.6s delay range with ±2.3% max error (for delays >512µs), 2.25V–5.5V single-supply operation, and CMOS output capable of sourcing/sinking 20mA. Used in switch debouncing and noise discrimination circuits where precise edge timing and AEC-Q100 reliability are required.

For engineers reviewing the LTC6994IS6-1#WTRMPBF datasheet, LTC6994IS6-1#WTRMPBF pinout, LTC6994IS6-1#WTRMPBF application, or LTC6994IS6-1#WTRMPBF equivalent, key selection criteria include delay accuracy over temperature (±0.006%/°C for NDIV ≥ 512), dynamic DIVCODE reconfiguration capability, supply current as low as 65µA at 2.25V/800kΩ, and automotive-grade –40°C to 85°C operation with TSOT-23 package.

Technical Context

The LTC6994IS6-1#WTRMPBF implements a master oscillator with 1µs base period, programmable via ISET current sourced from the SET pin (1.25µA–20µA). Delay is computed as tDELAY = NDIV × RSET / 50kΩ × 1µs, where NDIV is selected from eight divider ratios (1, 8, 64, 512, 4096, 2¹⁵, 2¹⁸, 2²¹) by a 4-bit A/D converter reading the DIV pin voltage.

It supports edge-selective delay: POL bit = 0 delays rising edges only; POL = 1 delays falling edges only. Input hysteresis ensures robustness against slow or noisy transitions, and the internal POR circuit enforces 500×tMASTER start-up time (typ. 500µs–8ms) before output becomes active.

Key Specifications

Pinout & Package

Package: 6-Lead Plastic TSOT-23 (ThinSOT™), 1mm profile, exposed pad optional for thermal relief. Pin numbering follows standard S6 top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EUT+T and TPS3808G01DBVR, the LTC6994IS6-1#WTRMPBF uniquely combines programmable edge-select delay, AEC-Q100 qualification, and 20mA drive strength - making it the sole option for automotive signal qualification requiring configurable µs-to-sec timing and robust output interfacing.

Availability

LTC6994IS6-1#WTRMPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and portable medical devices requiring stable component supply with full AEC-Q100 compliance and long-term production continuity.

Supply support for LTC6994IS6-1#WTRMPBF 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 TimerBlox® family-including LTC6994IS6-1#WTRMPBF-is designed for precision timing functions in space- and power-constrained systems where traditional crystal oscillators or microcontroller-based delays are impractical.

FAQ

What is the maximum delay achievable with the LTC6994IS6-1#WTRMPBF?

The LTC6994IS6-1#WTRMPBF achieves a maximum delay of 33.6 seconds using NDIV = 2²¹ (2,097,152) and RSET = 800kΩ. This is calculated as tDELAY = NDIV × RSET / 50kΩ × 1µs. At this setting, delay accuracy degrades to ±5.1% for 1µs–8µs ranges but remains ±2.3% for delays exceeding 512µs-making it suitable for long-interval timing with verified stability.

How does the LTC6994IS6-1#WTRMPBF differ from the LTC6994-2 variant?

The LTC6994IS6-1#WTRMPBF is the -1 version, meaning it delays only one edge (rising if POL = 0, falling if POL = 1). In contrast, the LTC6994-2 delays both edges and adds output inversion capability. The LTC6994IS6-1#WTRMPBF's edge-selective behavior makes it ideal for asymmetric pulse qualification, whereas the -2 variant suits symmetric delay or minimum-pulse-width generation.

Can the LTC6994IS6-1#WTRMPBF operate from a 2.5V supply?

Yes, the LTC6994IS6-1#WTRMPBF operates across 2.25V to 5.5V, including 2.5V. At 2.5V, its output can still source/sink 8mA (per VOH/VOL specs), and supply current drops to 65µA (typ.) with RSET = 800kΩ. Propagation delay increases to 24ns, and output rise/fall times extend to 2.7/2.4ns-fully within functional specification.

Is the TSOT-23 package of the LTC6994IS6-1#WTRMPBF lead-free and RoHS compliant?

Yes, the LTC6994IS6-1#WTRMPBF carries the "PBF" suffix, indicating lead-free (Pb-free) finish and full RoHS compliance. Its TSOT-23 package uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), allowing unlimited floor life at ≤30°C/60% RH.

What is the role of the DIV pin on the LTC6994IS6-1#WTRMPBF?

The DIV pin on the LTC6994IS6-1#WTRMPBF feeds a 4-bit A/D converter that sets both the divider ratio (NDIV) and polarity (POL) bit. For the LTC6994IS6-1#WTRMPBF, POL determines whether rising (POL = 0) or falling (POL = 1) edges are delayed. VDIV must be stable within ±1.5% of ideal (DIVCODE + 0.5)/16 × V+ and limited to <100pF capacitance to ensure accurate, jitter-free operation.