Analog Devices Inc. LTC2915HTS8-1#TRPBF

Overview

LTC2915HTS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-temperature voltage supervisor IC with 27 selectable reset thresholds, operating from 1.5V to 5.5V supply and consuming only 30μA typical quiescent current. It features three-state SEL1/SEL2/TOL inputs for selecting nominal voltages (12V to 1.0V + ADJ) and tolerance (–5%, –10%, –15%), ±1.5% threshold accuracy over –40°C to 125°C, and glitch-immune open-drain RST output - used in automotive engine control units to monitor critical 1.8V microcontroller supplies.

For engineers reviewing the LTC2915HTS8-1#TRPBF datasheet, LTC2915HTS8-1#TRPBF pinout, LTC2915HTS8-1#TRPBF application, or LTC2915HTS8-1#TRPBF equivalent, key selection criteria include guaranteed operation at 125°C, internal 200ms reset timeout (RT = VCC), 8-lead TSOT-23 package compatibility, and support for adjustable threshold via external resistor divider on VM pin.

Technical Context

The LTC2915HTS8-1#TRPBF implements a precision comparator-based supervision architecture with internally trimmed voltage references and programmable hysteresis via TOL input. Its VM input accepts either fixed thresholds (e.g., 1.8V ±5%) or an adjustable 0.5V reference point, enabling accurate monitoring of supplies down to 1.0V with ±1.5% total error across temperature.

Reset assertion is synchronized to both VM undervoltage detection and VCC power-up sequencing: RST remains low until VCC exceeds 0.8V, then asserts again if VM falls below the selected threshold. Glitch immunity is enforced by dual-stage filtering - analog comparator anti-glitch circuitry (t_UV = 10–150μs) plus digital reset timeout (150–260ms internal, adjustable via RT capacitor).

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (ThinSOT™), 3.0mm × 1.75mm × 1.0mm profile, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2915HTS8-1#TRPBF, LTC2916HTS8-1#TRPBF adds manual reset capability at no thermal or package penalty, while LTC2903CMS8-1#TRPBF trades programmability and temperature range for lower cost and power - making LTC2915HTS8-1#TRPBF optimal for programmable, high-reliability automotive supervision.

Availability

LTC2915HTS8-1#TRPBF is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC power sequencing, and medical device power integrity applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2915HTS8-1#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 and maintains its precision analog portfolio, including high-reliability supervisors, with global manufacturing and qualification to automotive AEC-Q100 standards.

The LTC2915 belongs to Linear's voltage supervisor product line, designed specifically for robust power-rail monitoring in harsh environments - emphasizing threshold accuracy, glitch immunity, and extended temperature operation for automotive and industrial systems.

FAQ

What is the maximum supply voltage the LTC2915HTS8-1#TRPBF can tolerate on its VCC pin?

The LTC2915HTS8-1#TRPBF has an absolute maximum VCC rating of 5.7V when used as a direct supply input. For higher-voltage operation (e.g., 12V automotive battery), the internal 6.2V shunt regulator must be used with a series current-limiting resistor to keep VCC pin current ≤5mA. The LTC2915HTS8-1#TRPBF datasheet specifies RCC sizing based on supply min/max to ensure safe operation without exceeding thermal limits.

How does the TOL pin function on the LTC2915HTS8-1#TRPBF, and what are its valid logic states?

The TOL pin on the LTC2915HTS8-1#TRPBF selects the tolerance band: VCC = –5%, open = –10%, GND = –15%. It is a three-state input with defined thresholds (V_IL ≤0.5V, V_IH ≥1.4V) and leakage ≤±5μA in open state. This pin is absent on LTC2916 variants. The LTC2915HTS8-1#TRPBF uses TOL in conjunction with SEL1/SEL2 to generate all 27 threshold combinations, enabling precise margining during validation testing.

Can the LTC2915HTS8-1#TRPBF monitor a 1.0V supply, and how is the threshold set?

Yes, the LTC2915HTS8-1#TRPBF supports 1.0V nominal monitoring with –5%/–10%/–15% tolerance options (e.g., 0.95V, 0.90V, 0.85V trip points). This is selected via SEL1=GND and SEL2=Open per the Monitor Selection Table. Threshold accuracy remains ±1.5% over –40°C to 125°C, and the VM input impedance (0.5–8MΩ) ensures minimal loading on low-voltage rails. The LTC2915HTS8-1#TRPBF achieves this without external components, unlike adjustable-mode alternatives requiring precision dividers.

What is the minimum VCC voltage required for the LTC2915HTS8-1#TRPBF to assert a valid RST signal?

The LTC2915HTS8-1#TRPBF guarantees RST assertion (low) for VCC ≥0.8V, ensuring reliable reset generation during power-up even before the monitored supply (VM) stabilizes. Below 0.8V, RST behavior is undefined. Once VCC exceeds 1.5V (UVLO threshold), the internal reference becomes active and VM monitoring begins. This two-stage power-on reset sequence is documented in the LTC2915HTS8-1#TRPBF Applications Information section and verified across temperature.

Does the LTC2915HTS8-1#TRPBF support adjustable timeout periods, and how is it implemented?

Yes, the LTC2915HTS8-1#TRPBF supports adjustable reset timeout via the RT pin: connecting an external capacitor (C_RT) from RT to GND sets t_RST ≈ C_RT × 110 pF/ms (e.g., 2.2nF → ~240ms). Leaving RT floating yields ~400μs; tying RT to VCC selects the fixed 200ms internal timeout. This flexibility allows tailoring reset hold time to specific processor boot requirements without changing firmware. All configurations are validated in the LTC2915HTS8-1#TRPBF Typical Performance Characteristics.