Texas Instruments TLC7705IP

Overview

TLC7705IP from Texas Instruments is a micropower supply voltage supervisor IC designed for reset control in microcomputer and microprocessor systems. It features a fixed 4.55 V sense threshold, programmable delay time via external capacitor (td = 2.1 × 10⁴ × CT), defined RESET output down to VDD ≥ 1 V, maximum supply current of 16 µA, and operates across –40°C to 85°C. It supports power-down control for static RAM with battery backup in medical imaging and industrial control applications.

For engineers reviewing the TLC7705IP datasheet, TLC7705IP pinout, TLC7705IP application, or TLC7705IP equivalent, this page delivers verified technical context, exact DRB/PDIP-8 package mapping, confirmed electrical specifications including VIT– = 4.47–4.63 V and td = 1.1–4.2 ms, and real-world use cases in power-fail memory retention and embedded system initialization.

Technical Context

The TLC7705IP monitors the SENSE input against a precision, temperature-compensated internal reference. When VI(SENSE) drops below 4.55 V (with 70 mV hysteresis), it asserts active-low RESET after a user-programmable delay determined by an external capacitor. Power-on reset activates at VDD ≥ 1 V, ensuring reliable initialization before system clock start-up.

Its dual-output configuration (RESET and RESET) enables direct interface with both active-high and active-low reset logic. The CONTROL pin allows polarity inversion: when tied to GND, RESET becomes active-high-critical for enabling chip-select gating during power loss in battery-backed SRAM systems.

Key Specifications

Pinout & Package

Package: PDIP-8 (Plastic Dual Inline Package, 0.300-inch width). RoHS-compliant, through-hole mountable, NIPDAU lead finish, no moisture sensitivity level (MSL) restriction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7705IPWR, the TLC7705IP offers through-hole manufacturability and legacy board compatibility; compared with TLC7705QP, it trades extended temperature capability for lower cost and qualification scope-ideal for commercial-grade instrumentation.

Availability

TLC7705IP is available at Aetrix Electronics and suitable for medical imaging subsystems, industrial PLC controllers, and point-of-care diagnostics requiring stable component supply, long-term obsolescence management, and full traceability.

Supply support for TLC7705IP 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 over 90 years of innovation in precision analog and power management ICs.

The TLC77xx family was engineered specifically for reliable power-supply monitoring and reset generation in resource-constrained microcontroller systems-emphasizing ultra-low power, wide temperature operation, and robust noise immunity.

FAQ

What is the exact sense threshold voltage tolerance for TLC7705IP?

The TLC7705IP has a guaranteed negative-going input threshold voltage (VIT–) of 4.47 V (min) to 4.63 V (max) at VDD = 2 V to 6 V, with a typical value of 4.55 V. This 160 mV total span includes process, voltage, and temperature variation-no external calibration is needed for 5 V rail supervision.

Can TLC7705IP drive a standard microcontroller reset pin directly?

Yes, the TLC7705IP provides ±2 mA output drive capability on both RESET and RESET pins, meeting or exceeding the input leakage and capacitance requirements of most ARM Cortex-M, PIC, and MSP430 microcontrollers. Its defined 1 V power-up reset ensures assertion before the MCU's internal POR circuit releases.

How does the CONTROL pin affect reset polarity in TLC7705IP?

When CONTROL is tied to GND, the TLC7705IP configures RESET as active-high and RESET as active-low-enabling direct connection to MCUs requiring high-asserted reset. With CONTROL open or pulled high, RESET is active-low and RESET is active-high. This dual-mode flexibility eliminates need for external inverters.

What capacitor value yields a 100 ms reset delay with TLC7705IP?

Using the formula td = 2.1 × 10⁴ × CT, a 100 ms (0.1 s) delay requires CT = 0.1 / 21000 ≈ 4.76 nF. A standard 4.7 nF ceramic capacitor achieves td ≈ 99 ms-well within datasheet tolerance. Ensure capacitor is X7R or better, placed close to the SENSE pin for stability.

Is TLC7705IP suitable for battery-backed SRAM retention during main power loss?

Yes-the TLC7705IP explicitly supports power-down control for static RAM with battery backup. By connecting CONTROL to GND and routing RESET to the SRAM's chip select, the device disables memory access during brownout while holding the CPU in reset, preserving data integrity without external logic.