Texas Instruments TL7759CPS

Overview

TL7759CPS from Texas Instruments is a supply-voltage supervisor IC functioning as a power-on reset generator and undervoltage detector for 5-V microcomputer systems. It provides true and complementary reset outputs (RESET and RESET̅), features a precision input threshold of 4.55 V ±120 mV, operates across 1 V to 7 V supply range, and guarantees defined reset states when VCC exceeds 1 V.

For engineers reviewing the TL7759CPS datasheet, TL7759CPS pinout, TL7759CPS application, or TL7759CPS equivalent, key selection criteria include its 4.55 V trip point tolerance, dual active-high/active-low reset outputs, low 20 µA standby current, reset pulse timing (tPLH/tPHL ≤ 5 µs), and operation over 0°C to 70°C.

Technical Context

The TL7759CPS implements a comparator-based voltage supervision architecture with internal reference and hysteresis (30–70 mV). Its input threshold (VIT–) triggers reset assertion during negative-going VCC transients, while power-up reset activation begins at ~1 V, ensuring deterministic initialization before logic thresholds are crossed.

It delivers rail-to-rail reset output drive capability: RESET supports 24 mA sink current (VOL = 0.4 V @ IOL = 24 mA), RESET̅ sources up to –8 mA (VOH = VCC–1 V), and both outputs remain valid across full 1–7 V VCC range - enabling direct interface with TTL, CMOS, and mixed-voltage logic families.

Key Specifications

Pinout & Package

The TL7759CPS is packaged in an 8-pin plastic small-outline (PS) package, identical in footprint and pin assignment to the D and PW variants per TI's standard SOIC-8 layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7759CPS, TL7705CP offers simpler threshold behavior but sacrifices output flexibility and hysteresis control, while TPS3808G12DBVR delivers superior power efficiency and adjustability at the cost of increased design effort and loss of integrated complementary signaling.

Availability

TL7759CPS is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, medical device logic supervision, and point-of-sale terminal power management requiring stable component supply and long-term design continuity.

Supply support for TL7759CPS 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 consumer markets since 1930.

The TL77xx family was developed specifically for robust, low-cost power-supply supervision in microprocessor-based systems - emphasizing precision threshold accuracy, dual-output flexibility, and wide-voltage operability in commercial temperature grades.

FAQ

What is the exact input voltage threshold specification for TL7759CPS?

The TL7759CPS has a nominal input threshold voltage of 4.55 V with a tolerance of ±120 mV over the full operating temperature range (0°C to 70°C). This value corresponds to the negative-going VCC threshold (VIT–), and hysteresis adds 30–70 mV separation from the positive-going threshold (VIT+), ensuring stable reset behavior during supply fluctuations. The TL7759CPS datasheet SLVS042D specifies this parameter under "Electrical Characteristics" with test conditions at TA = 0°C to 70°C.

Does TL7759CPS provide both active-high and active-low reset outputs simultaneously?

Yes, TL7759CPS provides true and complementary reset outputs: pin 5 is RESET (active-high) and pin 6 is RESET̅ (active-low). Both outputs switch synchronously during power-up and undervoltage events. The outputs remain valid across the entire 1 V to 7 V supply range, and RESET̅ is not an inverted version of RESET via internal logic - it is a dedicated, independently buffered output stage, enabling direct connection to processors or peripherals requiring either polarity without external components.

What is the minimum supply voltage at which TL7759CPS guarantees defined reset output states?

TL7759CPS guarantees defined reset output states when VCC exceeds 1 V. Below 1 V, outputs enter an undefined state - a deliberate design feature to avoid spurious reset pulses during deep power-down or battery depletion. This behavior is explicitly documented in the datasheet: "Reset outputs defined when VCC exceeds 1 V", and the functional block diagram confirms internal circuitry activation begins near this threshold. At 1 V, RESET goes high and RESET̅ goes low, initiating the power-on reset sequence.

Can TL7759CPS operate reliably with a 3.3 V supply rail?

Yes, TL7759CPS operates reliably across 1 V to 7 V, including 3.3 V nominal supplies. However, its fixed 4.55 V threshold means it will assert reset continuously when used on a 3.3 V rail - making it unsuitable for direct 3.3 V supervision. It is purpose-built for 5 V systems. For 3.3 V applications, TI recommends alternatives like TL7703 (3.08 V threshold) or TPS3808G01 (adjustable). The TL7759CPS datasheet confirms its target use case is "5-V systems" in the Power Portal description.

What package type and pin count does TL7759CPS use?

TL7759CPS uses an 8-pin plastic small-outline (PS) package - functionally and mechanically identical to the industry-standard SOIC-8 (D) and TSSOP-8 (PW) variants. Pinout matches TI's standard layout: VCC (pin 1), three NC pins (pins 2, 3, 7), GND (pin 4), RESET (pin 5), RESET̅ (pin 6), and one additional NC (pin 8). The PS package shares thermal and electrical characteristics with the D and PW versions, and all are rated for 0°C to 70°C operation.