NC7SZ126M5X

The NC7SZ126M5X is a single buffer with 3-state output from ON Semiconductor’s TinyLogic UHS (Ultra High Speed) family. This device provides buffering and line driving capability in an ultra-compact SOT-23-5 package, making it ideal for space-constrained applications. Fabricated using advanced sub-micron CMOS technology, the NC7SZ126 achieves ultra-high speed operation with propagation delays as low as 3.0 ns at 3.3V supply voltage, while maintaining very low quiescent power consumption. The ‘NC7’ prefix designates the Fairchild/ON Semiconductor TinyLogic series, ‘SZ’ indicates single-gate UHS technology, ‘126’ is the function code (single 3-state buffer with active high enable), ‘M’ specifies SOT-23-5 package, and ‘5X’ indicates the specific package variant and shipping format. The device features a non-inverting buffer with a 3-state output controlled by an active-high output enable (OE) pin. When OE is high, the output follows the input; when OE is low, the output is placed in a high-impedance state, making it suitable for bus-oriented applications where multiple devices share a common signal line. The wide supply voltage range of 1.65V to 5.5V allows operation from a variety of power supply rails, including 1.8V, 2.5V, 3.3V, and 5V systems. The high output drive capability of ±24mA means the device can drive relatively heavy loads, making it useful as a line driver for signals traveling across PCB traces or between boards.

The NC7SZ126M5X operates as a CMOS buffer with 3-state output capability: 1) Input Stage: The input signal (A) is received by a CMOS input buffer. The input is compatible with both TTL and CMOS logic levels across the operating voltage range. When operated at lower voltages (e.g., 3.3V), the inputs are 5V tolerant, allowing the device to serve as a level translator from higher voltage logic. 2) Logic Stage: The signal passes through an internal non-inverting buffer stage. Despite being a single-gate device, the internal design may include multiple inverter stages to achieve the desired speed and drive characteristics while maintaining the non-inverting function. 3) Output Enable Control: The output enable (OE) signal controls a set of transmission gates at the output. When OE is high, the output drive transistors are enabled, and the signal is passed to the output pin (Y). When OE is low, both the pull-up PMOS and pull-down NMOS output transistors are turned off, placing the output in a high-impedance (high-Z) state. 4) Output Stage: The output is a push-pull CMOS output stage with both PMOS (pull-up) and NMOS (pull-down) transistors, capable of sourcing and sinking up to 24mA. This high drive capability allows the device to drive capacitive loads with fast edge rates. 5) Power and Ground: The device operates from a single VCC supply (1.65V to 5.5V). The speed and drive capability scale with supply voltage – higher voltages provide faster switching and higher output current. The 3-state functionality makes this device particularly useful in bus architectures where multiple sources need to drive a common signal line. Only the device with its output enabled drives the line; all others are in high-impedance state, preventing bus contention.

• Address and data bus buffering in microprocessor systems
• Clock signal distribution and line driving
• Level translation between different voltage domains
• Load isolation and fanout expansion in digital systems
• Portable and battery-powered electronics (low power)
• High-speed data communication interfaces
• Memory interface signal conditioning
• Networking and telecommunications equipment