SN74AHCT125DBR

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The SN74AHCT125DBR is a low-power LS-TTL compatible quad-channel translator that is designed for high-speed buffering, bi-directional level-shifting and bus operation. This IC can handle up to 15V input and output voltage range, making it suitable for designing next-generation digital systems. It is a perfect choice for those who are looking for a robust buffering solution for static dual digital-level interfacing.

Logic - Buffers, Drivers, Receivers, Transceivers

SN74AHCT125DBR is a logic level translator belonging to the category of Buffers, Drivers, Receivers, Transceivers. It provides fast buffering of digital signals between two different voltage level circuits. The most common application of this device includes level-shifting between two different logic families including 3.3V and 5V logic families. It can also be used to interface two other logic families such as 1.2V and 3.3V, 1.8V and 2.5V, etc.

Other applications of SN74AHCT125DBR include downsizing the footprint of the circuit, providing synchronous interface between microprocessors or memory devices, data transfer over a longer distance, and converting logic signals from one logic family to another. Additionally, it can function as a translating circuit in multi-voltage processor chipset applications. The device is also suitable for applications such as designing a voltage level translators, high-speed level-shifting, and differential fan-out drivers.

Working Principle

SN74AHCT125DBR is a quad-channel translator equipped with 4-bidirectional channels. Each channel acts as a bidirectional level shifter or buffer. This IC drives and receives logic signals between different logic families with electrical characteristics that are similar to logic families. The bidirectional capability simplifies operation and eliminates the requirement of external power or logic control.

The active state of this device is controlled by the open-drain output. The open-drain is driven low for a logic low and is left high impedance for a logic high. The voltage levels of each output are clamped by their respective GNDs, which can be tied together but should not be tied to the INH pin. The common voltage level is tied to the supply VCC which should be between 1.2V and 5.5V.

A logic low on the inhibit (INH) pin effectively places all four channels in the high-impedance state. When the device is turned on and all channels are available, the device has an output transition time of 0.90 ns (MAX).

Having low supply current of less than 5 mA, the SN74AHCT125DBR offers high speed operation, minimizing the amount of power consumed during data transfer. The device provides voltage thresholds of 1.0V for TTL compatible inputs and 1.7V for SCH compatible inputs and a minimum pull-down capability of -20 mA, making it an ideal choice for applications up to 15V.

The SN74AHCT125DBR also provides a wide range of logic-level translation from 3-5V, 2-5V, or 1.69V-5V, making it suitable for any application with logic-level mismatch. With power savings up to 70%, this device is the perfect choice for low-power applications.

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