Analog Devices Inc. LTC6994IS6-2#WTRPBF

Overview

LTC6994IS6-2#WTRPBF from Analog Devices is a programmable dual-edge delay block in the TimerBlox family, delivering 1µs to 33.6s input-to-output delay with ±2.3% max error (for delays >512µs), CMOS output sourcing/sinking 20mA, and operation from 2.25V to 5.5V supply. It is used in switch debouncing, noise discrimination, and pulse qualification in automotive-grade industrial control systems.

For engineers reviewing the LTC6994IS6-2#WTRPBF datasheet, LTC6994IS6-2#WTRPBF pinout, LTC6994IS6-2#WTRPBF application, or LTC6994IS6-2#WTRPBF equivalent, key selection criteria include delay accuracy vs. temperature, RSET/VDIV programming interface, dual-edge delay behavior with polarity inversion, and AEC-Q100 qualification for automotive environments.

Technical Context

The LTC6994IS6-2#WTRPBF implements a master oscillator (t_MASTER = 1µs × R_SET/50kΩ) feeding an 8-step programmable divider (NDIV = 1, 8, 64, ..., 2²¹) to set total delay t_DELAY = NDIV × R_SET/50kΩ × 1µs. Its internal 4-bit A/D converter reads V_DIV to determine both NDIV and POL bit configuration.

Unlike the LTC6994-1, the LTC6994-2 variant delays both rising and falling edges of the IN signal; when POL = 1, it inverts the output. The SET pin regulates V_SET to 1.00V ±30mV, making delay accuracy dependent solely on R_SET tolerance and inherent device error-not V_SET drift.

Key Specifications

Pinout & Package

Package: 6-Lead Plastic TSOT-23 (S6), 1mm profile, exposed pad optional, rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EUS+T and CD4098BE, the LTC6994IS6-2#WTRPBF offers factory-qualified automotive reliability, resistor-only programming (no capacitor drift), lower power (65µA), and precise dual-edge delay with polarity control - making it optimal for next-generation embedded timing where flexibility and qualification matter.

Availability

LTC6994IS6-2#WTRPBF is available at Aetrix Electronics and suitable for automotive control modules, industrial sensor interfaces, and portable medical devices requiring stable component supply with AEC-Q100 assurance and long-term lifecycle support.

Supply support for LTC6994IS6-2#WTRPBF 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 LTC6994IS6-2#WTRPBF belongs to the TimerBlox family - silicon timing devices designed to replace discrete RC timers and microcontroller-based delays with guaranteed accuracy, low power, and minimal external components.

FAQ

What is the maximum delay achievable with the LTC6994IS6-2#WTRPBF?

The LTC6994IS6-2#WTRPBF supports a maximum delay of 33.6 seconds, achieved when NDIV = 2²¹ (2,097,152) and R_SET = 800kΩ. This is calculated as t_DELAY = NDIV × R_SET/50kΩ × 1µs. At this setting, the device maintains ±5.1% accuracy for delays between 1µs and 8µs, and ±2.3% for delays above 512µs - verified across its –40°C to +85°C operating range.

How does the LTC6994IS6-2#WTRPBF differ from the LTC6994-1 variants?

The LTC6994IS6-2#WTRPBF is the LTC6994-2 variant, meaning it delays both rising and falling edges of the IN signal - unlike the LTC6994-1 which delays only one edge. Additionally, when POL = 1 (via DIV pin voltage), the LTC6994IS6-2#WTRPBF inverts the output. This enables configurable pulse generation and minimum-pulse-width enforcement, critical for noise rejection and timing integrity in automotive applications.

Can the LTC6994IS6-2#WTRPBF operate from a 2.5V supply?

Yes, the LTC6994IS6-2#WTRPBF operates over a supply range of 2.25V to 5.5V, fully specified down to 2.25V. At 2.5V, it delivers ±20mA output drive, 500µs typical start-up time (with R_SET = 50kΩ), and maintains delay accuracy within datasheet limits. Propagation delay increases to 24ns and output VOH/VOL shift accordingly - all parameters are characterized and guaranteed across voltage and temperature.

Is the LTC6994IS6-2#WTRPBF pin-compatible with other TimerBlox delay blocks?

No, the LTC6994IS6-2#WTRPBF is not pin-compatible with other TimerBlox devices such as LTC6993 or LTC6995. Its S6 package pinout (IN, GND, SET, DIV, V+, OUT) is unique to the LTC6994 family. While functional overlap exists (e.g., programmable delay), substitution requires PCB layout revision due to differing pin assignments and signal roles - especially the dedicated DIV and SET pins not present in monostable or oscillator variants.

What is the role of the SET pin on the LTC6994IS6-2#WTRPBF?

The SET pin on the LTC6994IS6-2#WTRPBF sinks a current (I_SET) that programs the master oscillator frequency. A resistor (R_SET) from SET to GND sets I_SET = V_SET/R_SET, where V_SET is internally regulated to 1.00V ±30mV. This makes delay accuracy independent of supply or temperature drift in V_SET, relying only on R_SET tolerance - enabling predictable, low-drift timing without active regulation circuitry.