Analog Devices Inc. LTC2917IDDB-B1#TRPBF

Overview

LTC2917IDDB-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 9 selectable nominal thresholds (12V to 0.5V ADJ), ±5%/±10%/±15% tolerance selection, and a windowed watchdog timer. It operates from 1.5V to 5.5V supply, consumes 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to +85°C, and supports automotive-grade reliability. It is used in microprocessor reset supervision for industrial control systems requiring glitch-immune power monitoring.

For engineers reviewing the LTC2917IDDB-B1#TRPBF datasheet, LTC2917IDDB-B1#TRPBF pinout, LTC2917IDDB-B1#TRPBF application, or LTC2917IDDB-B1#TRPBF equivalent, this page delivers verified specifications, DFN-10 package layout, internal/external timing configurations, and validated alternatives for high-reliability embedded reset design.

Technical Context

The LTC2917IDDB-B1#TRPBF implements a dual-stage comparator architecture with programmable hysteresis via three-state SEL1/SEL2/TOL inputs, enabling 27 discrete threshold combinations (9 voltages × 3 tolerances). Its windowed watchdog (B1 version) requires falling edges on WDI within both upper (1.3–2.0s) and lower (37.5–62.5ms) boundaries to avoid RST assertion - a critical feature for fail-safe automotive and industrial firmware monitoring.

Reset timing is configurable via RT pin: open-circuit yields ~400μs, VCC tie yields ~200ms, or external capacitor (CRT) enables adjustable timeout (e.g., 2.2nF → 20ms). The VM input supports direct connection to regulated supplies or external resistive dividers for ADJ mode (0.5V reference), with guaranteed RST assertion down to VCC ≥ 0.8V and VM < threshold.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection). Pin pitch: 0.5mm. Thermal resistance θJA = 43°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6326US29D3+T and TPS3808G33DBVR, the LTC2917IDDB-B1#TRPBF provides unique configurability across 9 voltages and 3 tolerances, plus windowed watchdog timing essential for high-integrity industrial and automotive firmware supervision - features absent in both alternatives.

Availability

LTC2917IDDB-B1#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, optical networking line cards, and medical infusion pump controllers requiring stable component supply with guaranteed long-term availability.

Supply support for LTC2917IDDB-B1#TRPBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2917 family was designed specifically for robust, low-power microprocessor reset supervision in harsh environments - emphasizing threshold accuracy, glitch immunity, and windowed watchdog reliability for automotive and industrial applications.

FAQ

What is the function of the TOL pin on the LTC2917IDDB-B1#TRPBF?

The TOL pin on the LTC2917IDDB-B1#TRPBF selects the tolerance band (–5%, –10%, or –15%) applied to the nominal voltage threshold set by SEL1/SEL2. It is a three-state input: tied to VCC for –5%, left open for –10%, or grounded for –15%. This pin is absent on LTC2918 variants, which fix tolerance at –5%. The LTC2917IDDB-B1#TRPBF uses TOL to define hysteresis width, ensuring reliable release above the trip point.

Does the LTC2917IDDB-B1#TRPBF support operation from a 12V supply?

Yes, the LTC2917IDDB-B1#TRPBF supports 12V supply operation via its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V input) must be used to keep VCC pin current ≤5mA. This configuration is explicitly validated in the datasheet's Figure 3 and Typical Application TA03, making the LTC2917IDDB-B1#TRPBF suitable for automotive and industrial 12V systems.

How does the windowed watchdog in the LTC2917IDDB-B1#TRPBF differ from standard watchdogs?

The LTC2917IDDB-B1#TRPBF implements a true windowed watchdog: it requires falling edges on WDI to occur strictly between the lower boundary (37.5–62.5ms) and upper boundary (1.3–2.0s). Edges outside this window - too fast or too slow - trigger RST. Standard watchdogs (e.g., LTC2917-A) only enforce an upper bound. This dual-boundary enforcement in the LTC2917IDDB-B1#TRPBF prevents both frozen and runaway firmware states.

Can the LTC2917IDDB-B1#TRPBF monitor a 1V supply?

Yes, the LTC2917IDDB-B1#TRPBF directly supports 1V nominal monitoring with –5%, –10%, or –15% tolerance (e.g., 0.95V, 0.90V, or 0.85V trip points). This is achieved by configuring SEL1=GND and SEL2=Open per the Monitor Selection Table. The ±1.5% threshold accuracy ensures actual trip occurs between 0.850V and 0.950V over temperature - fully covering the 1V ±10% specification. The LTC2917IDDB-B1#TRPBF requires no external components for this configuration.

What is the minimum VCC voltage required for the LTC2917IDDB-B1#TRPBF to assert a valid RST?

The LTC2917IDDB-B1#TRPBF guarantees RST assertion for VCC ≥ 0.8V, as specified in the Electrical Characteristics table under VCC(MIN). Below 0.8V, device operation is undefined. Between 0.8V and 1.5V (UVLO threshold), RST remains asserted regardless of VM state - ensuring reliable power-on reset even during slow-ramp or brownout conditions. This behavior is intrinsic to the LTC2917IDDB-B1#TRPBF's internal VCC detect circuitry.