Texas Instruments TL7700CDGKR

Overview

TL7700CDGKR from Texas Instruments is a bipolar supply-voltage supervisor IC used as a reset controller in microcontroller, DSP, and FPGA systems. It features an adjustable 500 mV (±1%) sense threshold, 1.8 V to 40 V wide supply range, –40°C to 85°C operating temperature, 0.6 mA typical supply current at 40 V, and open-collector RESET output with 5 µs–10 µs minimum pulse width. It enables reliable power-on reset generation in industrial and automotive power-rail monitoring.

For engineers reviewing the TL7700CDGKR datasheet, TL7700CDGKR pinout, TL7700CDGKR application, or TL7700CDGKR equivalent, this page delivers verified functional identity, validated VSSOP-8 pin mapping, confirmed reset timing behavior, real-world hysteresis design methodology, and two technically documented alternative parts for voltage supervisor selection.

Technical Context

The TL7700CDGKR integrates a precision 1.5 V temperature-compensated reference, fast comparator, timing capacitor charge circuit (ICT = 15 µA typ), and npn open-collector output driver. Its SENSE input compares external divided rail voltage against a stable 500 mV internal reference, with hysteresis set via external resistor R1 (Vhys = Is × R1, Is = 2.5 µA typ).

RESET pulse duration (tpo) is programmable via external CT capacitor (tpo ≈ Ct × 10⁵ s), with minimum response time of 5–10 µs even at CT = 0. The device operates without external biasing-only VCC, GND, SENSE, CT, and RESET connections are required for basic supervision.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01DBVR and MAX6816EUT+T, the TL7700CDGKR uniquely supports fully adjustable sense voltage (>500 mV), user-defined hysteresis, and CT-programmable reset pulse width-all while operating from 1.8 V to 40 V, making it irreplaceable in multi-rail industrial and automotive designs requiring flexibility and robustness.

Availability

TL7700CDGKR is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and FPGA power sequencing requiring stable component supply across extended temperature and voltage ranges.

Supply support for TL7700CDGKR 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 communications markets.

The TL7700CDGKR belongs to TI's legacy bipolar voltage supervisor product line, engineered specifically for high-reliability power-rail monitoring in harsh environments where wide supply range, temperature stability, and field-proven robustness are mandatory.

FAQ

What is the function of the CT pin on the TL7700CDGKR?

The CT pin on the TL7700CDGKR connects to an internal 15 µA constant-current source that charges an external timing capacitor. This charging determines the duration of the active-low RESET pulse (tpo ≈ Ct × 10⁵ s). When CT is left open, the TL7700CDGKR operates as an adjustable-threshold comparator without timed reset. Driving CT with an external switch or FET enables controlled reset initiation independent of supply ramp.

Can the TL7700CDGKR monitor a 1.2 V supply rail?

Yes-the TL7700CDGKR can monitor a 1.2 V rail using a resistor divider on the SENSE pin. Since its internal reference is 500 mV, a divider ratio of (1.2 V / 0.5 V) = 2.4 is required (e.g., R1 = 140 kΩ, R2 = 100 kΩ). Hysteresis is added by selecting R1 to yield desired Vhys = Is × R1 (Is = 2.5 µA typ), ensuring stable operation despite rail noise or slow rise times.

Does the TL7700CDGKR require an external pullup resistor on the RESET pin?

Yes-the TL7700CDGKR RESET pin is an npn open-collector output and must be pulled up externally to a logic-compatible voltage (e.g., VCC or MCU I/O rail). A typical value is 10 kΩ to 4.7 kΩ. Without the pullup, RESET remains floating when inactive, risking undefined MCU behavior. The output sinks up to 3 mA, supporting direct interface to most microcontrollers' reset inputs.

What is the minimum pulse width of the RESET signal from the TL7700CDGKR?

The minimum RESET pulse width of the TL7700CDGKR is approximately 5 µs to 10 µs-even with CT = 0-due to internal comparator and output-stage propagation delays. This intrinsic minimum ensures reliable reset assertion regardless of external capacitor value. For longer durations, CT must be selected per tpo = Ct × 10⁵ s, with typical values ranging from 100 pF (tpo ≈ 10 µs) to 10 nF (tpo ≈ 1 ms).

How does temperature affect the sense voltage accuracy of the TL7700CDGKR?

The TL7700CDGKR's 500 mV sense reference is temperature-compensated, maintaining ±10 mV (±2%) deviation over –40°C to +85°C. At 25°C, Vs = 495–505 mV (±1%). Over full temperature range, Vs shifts to 490–510 mV per datasheet Section 6.5. This drift is fully characterized and included in hysteresis design margins-no additional derating is needed for industrial or automotive use cases.