Analog Devices Inc. LTC6993HS6-2#WTRPBF

Overview

LTC6993HS6-2#WTRPBF from Analog Devices is a retriggerable rising-edge monostable multivibrator (one-shot) in TSOT-23 package, operating from –40°C to 125°C. It delivers programmable pulse widths from 1µs to 33.6 seconds via RSET resistor and DIV pin voltage, with ±2.3% accuracy for pulses >512µs, CMOS output sourcing/sinking 20mA, and 70µA supply current at 10µs pulse width - used in automotive watchdog timers and missing-pulse detection.

For engineers reviewing the LTC6993HS6-2#WTRPBF datasheet, LTC6993HS6-2#WTRPBF pinout, LTC6993HS6-2#WTRPBF application, or LTC6993HS6-2#WTRPBF equivalent, key selection criteria include retrigger capability, temperature-grade compliance (–40°C to 125°C), SOT-23 footprint compatibility, and pulse-width accuracy vs. RSET/NDIV configuration.

Technical Context

The LTC6993HS6-2#WTRPBF implements a master oscillator with t_MASTER = 1µs × R_SET/50kΩ, feeding an 8-step programmable divider (NDIV = 1, 8, 64, ..., 2²¹) to set final pulse width t_OUT = NDIV × R_SET/50kΩ × 1µs. Its internal 4-bit A/D on the DIV pin simultaneously configures both NDIV and output polarity (positive/negative pulse).

Trigger logic responds to rising edges on TRIG with 11ns propagation delay at 5.5V, supports retriggering with minimum inter-trigger interval of 10ns (NDIV = 1), and maintains stable V_SET = 1.00V ±30mV via on-chip regulation - enabling accurate timing independent of supply voltage drift when using R_SET.

Key Specifications

Pinout & Package

6-lead Plastic TSOT-23 package (1mm profile), exposed pad optional, rated for –40°C to 125°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar monostable timing applications.

Compared with TLV3012IDBVR and MAX6816EUT+T, the LTC6993HS6-2#WTRPBF uniquely combines wide-range programmability (1µs–33.6s), retrigger capability, AEC-Q100 qualification, and ±2.3% accuracy - making it the only option for automotive-grade adaptive timing where pulse width must scale with system conditions.

Availability

LTC6993HS6-2#WTRPBF is available at Aetrix Electronics and suitable for automotive watchdog timers, missing-pulse detection systems, envelope detection circuits, and high-vibration timing applications requiring stable component supply across extended temperature ranges.

Supply support for LTC6993HS6-2#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 TimerBlox® family - including the LTC6993HS6-2#WTRPBF - was designed to replace discrete RC timing circuits with highly stable, programmable silicon solutions for automotive and industrial timing-critical subsystems.

FAQ

What is the maximum pulse width achievable with the LTC6993HS6-2#WTRPBF?

The LTC6993HS6-2#WTRPBF supports a maximum pulse width of 33.6 seconds, achieved when NDIV = 2²¹ (2,097,152) and R_SET = 800kΩ. This value is specified in the Electrical Characteristics table and confirmed across the full –40°C to 125°C operating range. The timing equation t_OUT = NDIV × R_SET/50kΩ × 1µs governs all configurations, and the LTC6993HS6-2#WTRPBF's internal architecture guarantees this upper limit under worst-case process and temperature conditions.

How does the retrigger functionality of the LTC6993HS6-2#WTRPBF differ from the non-retriggerable LTC6993-1 variants?

The LTC6993HS6-2#WTRPBF allows new rising-edge triggers to extend the active output pulse while it is already high - effectively resetting the timeout counter on each valid trigger. In contrast, LTC6993-1 variants ignore all subsequent triggers until the initial pulse completes and a short rearming time (t_ARM = –4ns) elapses. This makes the LTC6993HS6-2#WTRPBF ideal for detecting intermittent faults where signal presence must be sustained over variable durations, whereas LTC6993-1 suits fixed-interval timeout applications like power-on reset sequencing.

Can the LTC6993HS6-2#WTRPBF generate both positive and negative output pulses, and how is this controlled?

Yes, the LTC6993HS6-2#WTRPBF can generate either positive or negative output pulses. This is controlled by the POL bit within the 4-bit DIVCODE value, which is set by the voltage applied to the DIV pin. When POL = 0 (VDIV/V+ ≤ 0.46875), OUT goes high for the pulse duration; when POL = 1 (VDIV/V+ ≥ 0.53125), OUT goes low. Table 1 in the datasheet provides exact resistor-divider values for each DIVCODE, and the LTC6993HS6-2#WTRPBF's internal A/D converter interprets VDIV to configure both NDIV and polarity simultaneously.

What is the minimum recommended RSET value for the LTC6993HS6-2#WTRPBF, and why is it constrained?

The minimum recommended R_SET value for the LTC6993HS6-2#WTRPBF is 50kΩ, corresponding to a maximum I_SET of 20µA. This constraint arises from the internal master oscillator design: I_SET beyond 20µA risks exceeding the oscillator's linear operating region, degrading pulse width accuracy and increasing jitter. At R_SET = 50kΩ and V_SET = 1.00V, the LTC6993HS6-2#WTRPBF achieves its shortest guaranteed pulse width of 1µs (NDIV = 1), with ±4.9% accuracy - a specification validated across the full temperature range.

Is the LTC6993HS6-2#WTRPBF pin-compatible with other members of the LTC6993 family in the TSOT-23 package?

Yes, the LTC6993HS6-2#WTRPBF is pin-compatible with all other LTC6993-xS6 variants (e.g., LTC6993IS6-2#TRPBF, LTC6993CS6-2#TRPBF) in the 6-lead TSOT-23 package. Pin assignments (TRIG, GND, SET, DIV, V+, OUT) and electrical characteristics are identical across temperature grades and suffixes. The only differences are operating temperature range (–40°C to 125°C for HS6), automotive qualification (#WTRPBF), and part marking (LTDXJ). This allows drop-in replacement in existing designs when upgrading to automotive-grade reliability.