Texas Instruments TLC7705QPWRG4Q1

Overview

TLC7705QPWRG4Q1 from Texas Instruments is an automotive-qualified micropower supply voltage supervisor IC with fixed 4.5 V SENSE threshold, totem-pole RESET/RESET outputs, and programmable delay via external capacitor. It provides power-on reset generation, undervoltage supervision, and static RAM power-down control in microcontroller systems operating from 2 V to 6 V supply.

For engineers reviewing the TLC7705QPWRG4Q1 datasheet, TLC7705QPWRG4Q1 pinout, TLC7705QPWRG4Q1 application, or TLC7705QPWRG4Q1 equivalent, key selection criteria include its −40°C to 125°C AEC-Q100 qualification, 16 μA max supply current, 70 mV hysteresis, 1.1–4.2 ms delay range (CT = 100 nF), and dual active-high/active-low reset outputs for fail-safe system initialization.

Technical Context

The TLC7705QPWRG4Q1 implements a precision bandgap-based voltage reference with temperature compensation to maintain stable 4.5 V (±3%) SENSE threshold across −40°C to 125°C. Its internal timer generates a user-programmable reset delay (td = 2.1 × 10⁴ × CT) triggered when SENSE falls below VIT− or during power-up.

It features dual totem-pole outputs (RESET and RESET) eliminating need for external pull resistors, CONTROL input enabling battery-backed SRAM disable during power loss, and RESIN input supporting manual reset assertion. The device operates down to VDD ≥ 1 V and supports static RAM power-down control by driving CS with RESET while CONTROL is tied to CSH1.

Key Specifications

Pinout & Package

TSSOP-8 (PW) package, 3.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809EYZR and TPS3808G33DBVR, the TLC7705QPWRG4Q1 uniquely delivers dual active-high/active-low reset outputs, dedicated SRAM power-down control, and externally programmable delay - making it optimal for automotive systems requiring deterministic, fail-safe initialization and data retention.

Availability

TLC7705QPWRG4Q1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment head units, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC7705QPWRG4Q1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TLC77-Q1 product line was designed specifically for automotive power management, providing AEC-Q100-qualified voltage supervisors with micropower operation, precision thresholds, and integrated SRAM retention logic for safety-critical ECUs.

FAQ

What is the exact SENSE voltage threshold for TLC7705QPWRG4Q1?

The TLC7705QPWRG4Q1 has a fixed SENSE threshold of 4.5 V, specified as 4.43 V (min) to 4.63 V (max) over the full −40°C to 125°C operating range. This value is set by an internal resistor divider and does not require external configuration. The 70 mV hysteresis ensures stable operation during supply fluctuations. This threshold is confirmed in the Electrical Characteristics table of the SGLS208A datasheet.

Does TLC7705QPWRG4Q1 support battery-backed SRAM retention?

Yes, the TLC7705QPWRG4Q1 supports battery-backed SRAM retention through its CONTROL input. When CONTROL is driven low (e.g., by the microprocessor's CSH1 signal), the RESET output can be used to disable the SRAM chip select (CS) during power loss. The device must be powered from the backup battery in this configuration. This function is explicitly described in the Applications section and Figure 10 of the SGLS208A datasheet.

What is the maximum supply current of TLC7705QPWRG4Q1?

The maximum supply current (IDD) of TLC7705QPWRG4Q1 is 16 μA under recommended operating conditions (VDD = 2 V to 6 V, RESIN = VDD, CONTROL = 0 V, SENSE ≥ VITmax + 0.2 V). During the delay period (td), current rises to 150 μA max. These values are measured per the Electrical Characteristics table in the SGLS208A datasheet and enable ultra-low-power always-on supervision in automotive modules.

Can TLC7705QPWRG4Q1 generate reset pulses longer than 4.2 ms?

Yes, the TLC7705QPWRG4Q1 supports reset delays beyond 4.2 ms by increasing the external CT capacitor value. The delay formula td = 2.1 × 10⁴ × CT applies across the full capacitance range. For example, a 1 μF capacitor yields ~21 ms delay. The 1.1–4.2 ms range cited in the datasheet reflects testing with CT = 100 nF only. No upper limit is specified, though practical constraints include leakage and board space.

Is TLC7705QPWRG4Q1 pin-compatible with other TLC77xx-Q1 devices?

No, TLC7705QPWRG4Q1 is not pin-compatible with TLC7701QPWRQ1 or TLC7733QPWRQ1 in terms of SENSE threshold function, though all share identical TSSOP-8 (PW) pinout and terminal assignments. The SENSE threshold differs: TLC7701 = 1.1 V, TLC7705 = 4.5 V, TLC7733 = 3.0 V. Swapping devices without circuit review risks incorrect voltage monitoring. Pin compatibility is confirmed by the shared PW package drawing and functional block diagram in SGLS208A.