Texas Instruments SN74LVC2G101BQBR

Overview

SN74LVC2G101 from Texas Instruments is a dual D-type flip-flop with configurable gated clock logic, operating from 1.1V to 3.6V supply and supporting over-voltage tolerant inputs up to 5.5V. Each channel features independent D, active-low CLR, and four programmable clock inputs (CLKA–CLKD), enabling 2-input AND/OR/NAND/NOR/XOR/XNOR or single-input inverting/non-inverting configurations. It delivers ±24mA output drive at 3.3V and achieves 7ns max propagation delay - used in momentary-to-toggle conversion and clock division by 2 or 4.

For engineers reviewing the SN74LVC2G101 datasheet, SN74LVC2G101 pinout, SN74LVC2G101 application, or SN74LVC2G101 equivalent, key selection criteria include its Schmitt-trigger input hysteresis (ΔVT ≥ 0.07V), Ioff partial-power-down capability, 16-pin WQFN (BQB) package with thermal pad, and verified 160MHz max clock frequency at 3.3V.

Technical Context

The SN74LVC2G101 implements two independent edge-triggered D-type flip-flops, each with asynchronous active-low clear and a configurable 4-input combinational logic block feeding the internal clock path. The logic block supports eight distinct Boolean functions via static pin strapping of CLKA–CLKD, including 2-input gates and single-input inversion modes.

All inputs incorporate Schmitt-trigger architecture with hysteresis (ΔVT = 0.07–1.2V depending on VCC), enabling robust operation with slow or noisy signals. Output drivers are balanced CMOS push-pull with ±24mA sink/source capability at 3.3V, and Ioff protection ensures isolation during power-down states without back-drive current.

Key Specifications

Pinout & Package

The SN74LVC2G101 is packaged in a 16-pin WQFN (BQB) with 3.5mm × 2.5mm body size and exposed thermal pad (connectable to GND or left floating). Pin numbering follows top-view orientation with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual configurable flip-flop applications.

Compared with SN74LVC2G101, SN74LVC2G175DBVR offers identical voltage operation and input hysteresis but lacks clock configurability, limiting use to basic edge-triggered storage; 74LVC1G125GW,125 provides no latching capability at all, serving only as a non-inverting buffer - neither matches the integrated toggle/divide functionality and compact WQFN-16 footprint of the SN74LVC2G101.

Availability

SN74LVC2G101 is available at Aetrix Electronics and suitable for industrial control input conditioning, low-power clock division, momentary switch debounce, and multi-rail system state synchronization requiring stable component supply across extended temperature ranges.

Supply support for SN74LVC2G101 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 specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications portfolio coverage.

The SN74LVC2G101 belongs to TI's LVC low-voltage CMOS logic family, designed for high-speed, low-power, mixed-voltage interface applications where configurability, noise immunity, and small-footprint integration are critical.

FAQ

What is the maximum clock frequency supported by the SN74LVC2G101 at 1.8V supply?

The SN74LVC2G101 supports a maximum clock frequency of 70MHz at 1.8V ± 0.15V, as specified in the Timing Characteristics table (Section 5.6). This value is measured under recommended operating conditions with 50% duty cycle input and accounts for process, voltage, and temperature variation across –40°C to +125°C. At this voltage, propagation delay is 7.7ns (typical) with 30pF load.

Does the SN74LVC2G101 require external pull-up or pull-down resistors on unused clock inputs?

No - unused clock inputs (CLKA–CLKD) on the SN74LVC2G101 must be statically terminated to either VCC or GND to define the desired logic function, as their states directly configure the internal gate. Leaving them floating causes undefined behavior. TI recommends 10kΩ resistors for robust noise immunity; the Schmitt-trigger inputs eliminate transition-rate concerns but do not relax DC termination requirements.

Can the SN74LVC2G101 operate with a 5V input signal while powered from a 1.8V supply?

Yes - the SN74LVC2G101 features over-voltage tolerant inputs rated to 5.5V independent of VCC, so it safely accepts 5V logic signals even when VCC = 1.8V. This eliminates external level-shifting circuitry. However, outputs remain referenced to VCC (1.8V), so downstream devices must be compatible with 1.8V logic levels unless further translation is applied.

What is the purpose of the thermal pad on the SN74LVC2G101 BQB package?

The exposed thermal pad on the SN74LVC2G101 BQB (WQFN) package reduces junction-to-ambient thermal resistance (RθJA = 98.8°C/W) by providing a low-impedance conduction path to the PCB ground plane. TI specifies it may be connected to GND or left floating - grounding improves thermal performance and EMI suppression, but electrical connection is optional. No other signal or supply connections are permitted.

How does the Ioff feature of the SN74LVC2G101 protect system-level interconnects during power sequencing?

The Ioff feature disables all outputs of the SN74LVC2G101 when VCC = 0V, limiting leakage current to ±10µA per pin. This prevents back-drive current from powered sections (e.g., 3.3V MCU) into unpowered sections (e.g., 1.8V logic domain), avoiding latch-up, data corruption, or damage during staggered power-up/down sequences - a critical requirement in multi-rail industrial and automotive systems.