Texas Instruments TL7702ACP

Overview

TL7702ACP from Texas Instruments is a precision supply-voltage supervisor IC designed for reset control in microcomputer systems. It features a 2.53 V ±5 mV threshold voltage (V_IT−), operates from 3.5 V to 18 V supply, delivers dual active-high/active-low reset outputs (RESET and RESET), and supports externally adjustable reset pulse duration via capacitor CT. It is used in embedded systems requiring reliable power-on and brownout reset signaling.

For engineers reviewing the TL7702ACP datasheet, TL7702ACP pinout, TL7702ACP application, or TL7702ACP equivalent, key selection considerations include its fixed 2.53 V undervoltage detection threshold, PDIP-8 package with through-hole mounting, dual complementary reset outputs, temperature-compensated reference, and compatibility with TTL/CMOS logic interfaces.

Technical Context

The TL7702ACP integrates a precision bandgap voltage reference, comparator with hysteresis (10 mV), delay timer controlled by external CT capacitor, and dual open-collector reset drivers. Its SENSE input monitors system supply voltage, triggering RESET/RESET when V_SENSE falls below 2.48–2.58 V (25°C).

During power-up, RESET remains low until V_CC exceeds ~3.6 V and SENSE rises above V_IT+, then activates a programmable delay before deasserting. On undervoltage, both outputs assert immediately - RESET goes high, RESET goes low - ensuring deterministic microprocessor initialization.

Key Specifications

Pinout & Package

TL7702ACP uses an 8-pin PDIP (Plastic Dual In-line Package) with 9.81 mm × 6.35 mm body size and through-hole mounting. Pin spacing is 2.54 mm, compatible with standard 0.3-inch DIP sockets and PCB footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7702ACD and TPS3808G12DBVR, TL7702ACP provides unique value in through-hole reliability, user-adjustable reset timing, and a buffered 2.53 V reference - making it irreplaceable in legacy industrial and medical designs where layout stability and analog integration matter.

Availability

TL7702ACP is available at Aetrix Electronics and suitable for industrial control panels, legacy instrumentation, point-of-sale terminals, and medical diagnostic peripherals requiring stable component supply across extended product lifecycles.

Supply support for TL7702ACP 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 and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and microcontrollers.

The TL77xxA family was engineered specifically as cost-effective, precision voltage supervisors for microcomputer reset control - emphasizing threshold accuracy, thermal stability, and ease of integration in resource-constrained embedded systems.

FAQ

What is the exact undervoltage detection threshold of the TL7702ACP?

The TL7702ACP has a nominal negative-going input threshold voltage (V_IT−) of 2.53 V at 25°C, with a guaranteed range of 2.48 V to 2.58 V across temperature and process variation. This fixed threshold is factory-trimmed and does not require external resistors - distinguishing it from adjustable variants like TL7705A (4.55 V) or TL7712A (10.8 V). The TL7702ACP uses this precise 2.5 V-class trip point to supervise low-voltage logic rails or derived supplies.

Can the TL7702ACP monitor a 3.3 V supply directly?

Yes, the TL7702ACP can directly monitor a 3.3 V supply at its SENSE pin, provided the voltage remains within its specified input range of 0 V to 6 V (per datasheet Section 6.1). Since the 3.3 V rail exceeds the 2.53 V threshold, the device will assert RESET/RESET only during brownout events dropping below 2.48 V. No external resistor divider is needed - unlike higher-threshold variants - making TL7702ACP ideal for modern 3.3 V embedded systems.

Does the TL7702ACP provide both active-high and active-low reset outputs?

Yes, the TL7702ACP provides two complementary open-collector reset outputs: RESET (Pin 6, active-high) and RESET (Pin 5, active-low). Both outputs are asserted simultaneously during undervoltage or manual reset. Their open-collector structure allows direct wired-OR connection to shared reset buses and flexible pull-up configuration - enabling seamless interface with CPUs requiring either polarity, such as ARM-based SoCs (active-low) and certain FPGAs (active-high).

What capacitor value sets a 1.3 ms reset pulse on the TL7702ACP?

A 0.1 µF capacitor connected between CT (Pin 3) and GND yields a nominal reset pulse duration of 1.3 ms for the TL7702ACP, per the formula t_d = 1.3 × 10⁴ × C_T (where C_T is in farads). This value is confirmed in the Typical Application section (Section 9.2.2) of the SLVS028K datasheet and widely used in production designs. Capacitor tolerance and temperature coefficient affect actual timing - X7R ceramics are recommended for stability.

Is the REF pin on the TL7702ACP intended for external use?

Yes, the REF pin (Pin 1) delivers a precision 2.53 V ±5 mV temperature-compensated reference voltage usable for external circuits. The datasheet explicitly states it "can also be used in applications where a constant voltage source is required." Designers commonly route REF to ADC references, comparator bias networks, or sensor excitation - but must bypass it with a 0.1 µF capacitor to GND to suppress noise and ensure stability, as specified in Section 6.5 and Figure 8.