Texas Instruments TLC7705QPWREP

Overview

TLC7705QPWREP from Texas Instruments is a micropower supply voltage supervisor IC designed for reset control in microcomputer and microprocessor systems. It features a fixed 4.5 V sense threshold voltage, programmable delay time via external capacitor (td = 2.1 × 10⁴ × CT), totem-pole RESET/RESET outputs, and operates across 2 V to 6 V supply range with defined reset assertion down to VDD ≥1 V. It supports power-down control for static RAM with battery backup in aerospace-grade applications.

For engineers reviewing the TLC7705QPWREP datasheet, TLC7705QPWREP pinout, TLC7705QPWREP application, or TLC7705QPWREP equivalent, key selection considerations include its −40°C to 125°C extended temperature rating, 70 mV hysteresis, 16 µA max supply current, and TSSOP-8 package compatibility with high-reliability embedded control and defense electronics.

Technical Context

The TLC7705QPWREP implements a precision voltage-sensing comparator with internal temperature-compensated reference and automatic reset generation on power-up and undervoltage events. Its SENSE input monitors system rail voltage against a fixed 4.5 V threshold (VIT+ = 4.5 V, VIT− = 4.43 V), while CONTROL and RESIN inputs enable configurable reset polarity and manual reset initiation.

Delay timing is externally set via capacitor CT connected to the CT pin, yielding td = 2.1 × 10⁴ × CT seconds; typical values range from 1.1 ms to 4.2 ms with 100 nF. The device delivers active-high and active-low complementary RESET outputs in totem-pole configuration-no external pull resistors required-and maintains defined output states even at VDD as low as 1 V.

Key Specifications

Pinout & Package

TSSOP-8 (PW) package, 3.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant. Pin 1 marked by beveled corner; moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326LT31D3T, the TLC7705QPWREP uniquely supports field-adjustable delay, dual-polarity reset outputs, and −40°C to 125°C operation-making it the only option qualified for defense/aerospace power supervision where timing configurability and environmental robustness are mandatory.

Availability

TLC7705QPWREP is available at Aetrix Electronics and suitable for avionics power sequencing, defense system watchdog functions, and medical imaging data retention requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for TLC7705QPWREP 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and high-performance operation in demanding environments.

The TLC77xx-EP family was engineered specifically for defense, aerospace, and medical applications requiring extended temperature operation, controlled baseline manufacturing, and full product traceability-meeting MIL-PRF-38535 and QML-V requirements.

FAQ

What is the exact sense threshold voltage of the TLC7705QPWREP?

The TLC7705QPWREP has a fixed sense threshold voltage of 4.5 V (typical), with VIT+ = 4.43 V to 4.63 V and VIT− = 4.36 V to 4.56 V across temperature. This 4.5 V setting is factory-trimmed and internally generated-no external resistors are required, unlike the TLC7701 variant. The 70 mV hysteresis ensures clean transition behavior during supply ramp-up or sag.

How do I configure the reset delay time for the TLC7705QPWREP?

The reset delay time (td) of the TLC7705QPWREP is set by an external capacitor connected between the CT pin and GND. Use the formula td = 2.1 × 10⁴ × CT, where CT is in farads and td is in seconds. For example, a 100 nF capacitor yields td ≈ 2.1 ms. The datasheet specifies 1.1 ms to 4.2 ms typical delay range with 100 nF, validated across −40°C to 125°C.

Does the TLC7705QPWREP support active-high reset for memory control?

Yes-the TLC7705QPWREP provides both active-high (RESET) and active-low (RESET) complementary outputs. When the CONTROL pin is tied to GND, RESET becomes active-high, enabling direct connection to static RAM chip select (CS) lines. This feature is explicitly documented in Figure 11 and Application Information section for battery-backed data retention during power failure.

What is the minimum supply voltage at which the TLC7705QPWREP guarantees defined reset output states?

The TLC7705QPWREP guarantees defined RESET and RESET output states when VDD ≥1 V. This is specified as the power-up reset voltage (Vres) in the Electrical Characteristics table. Below 1 V, output behavior is undefined; above 1 V, the device asserts reset until VDD reaches ≥2 V and the SENSE voltage exceeds the threshold plus delay timeout.

Is the TLC7705QPWREP pin-compatible with other members of the TLC77xx-EP family?

Yes-the TLC7705QPWREP shares identical TSSOP-8 (PW) pinout and footprint with TLC7701QPWREP and TLC7733QPWREP. All three devices use the same pin assignments for RESIN, CONTROL, SENSE, CT, GND, VDD, RESET, and RESET. However, threshold voltages differ: TLC7701 = 1.1 V, TLC7705 = 4.5 V, TLC7733 = 3.0 V-so electrical substitution requires verification of system rail compatibility.