74HC245 Transceiver IC: Price, Uses and Datasheet

The 74HC245 is a 3−state noninverting transceiver that is used for asynchronous transfer of data communication between two devices. Furthermore, it supports data transfer at different voltage levels. 

The device has an active−low Output Enable pin, which is used to place the I/O ports into high−impedance states. The Direction control determines whether data flows from A to B or from B to A. 

The internal structure of a chip is composed of two amplifiers. Hence, it can perform two-way communication. This bidirectional communication is achieved by a signal applied at the direction control pin. It has very low input current and consumes less power.

These features make it suitable for a large number of applications.  Low power consumption, wide voltage range, low input current are the major features associated with 74HC-245. 74HC 245 is mostly used in personal computers, servers, wearable health devices, fitness devices, network switches, electronic points of sale etc.

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3D Model

●lead free

●Supply Voltage Range : 2V to 6V

●Output Voltage is equal to Vcc

●Minimum Input Voltage: 0.8V

●Maximum Input Voltage: 4.2V

●Minimum Output Voltage: 1.9V

●Maximum Output Voltage: 5.4V

●Output Current: 35mA

●Off-State Output Current: 10uA

●low input current :1A

●Propagation delay:13 ns.

●Non-Inverting, hence easy to interface

●Available in 20-pin SO20, SSOP20, TSSOP20 and DHVQFN20 packages

Nexperia USA Inc. 74HC245D,653 technical specifications, attributes, parameters and parts with similar specifications to Nexperia USA Inc. 74HC245D,653.

Logic Symbol

IEC Logic Symbol

The 74HC245 is an 8-bit transceiver IC with 3-state output. Meaning it has two set of pins (A0-A7 and B0-B7), in which each set has 8 pins. Out of these two sets one set can be used as input and the other set can be used as output. Since the IC is a transceiver IC, Data can flow from input bus to output bus and also from output bus to input bus, by simply toggling the Direction pin (DIR) pin as required. It also has a decent output current of 35mA and hence can be used to drive nominal loads.

So if you are looking for an IC to act as a buffer or as a transceiver for your address or data bus. Or if you are looking for an IC to act as a 8-bit logic level converter then 74HC245 IC might be the right choice for you. It is also possible to use this IC for establishing communication protocol buses (SPI, IIC etc) between two different MCU/MPU with different operating voltages since the IC has high speed buffer. The 3 State at which 74HC245 IC can operate is shown in the table, the pins OE and DIR can be used as follows to set the state.

74HC245 IC has a vast application; however for simplicity let us consider we are using the IC to act as logic level converter. Many hardware like Raspberry Pi, MSP430 operates with a voltage of 3.3V, but other sensors or IC’s like Ultrasonic sensor, TFT LCD displays etc operate in 5V. So in these cases we have to shift one set of operating voltage (3.3V) to another set (5V). In these cases we employ a logic level converter; the simplest logic level converter is a potential divider. But it is not efficient for high speed operation or for bi-directional communication buses. Hence in those cases a bi-directional transceiver IC like 74HC245 seems to be an ideal choice.

A general circuit diagram using IC 74HC245 as a logic level converter is shown above. Here we are converting the 3.3V data lines to 5V data Lines. The Data can be made to flow in both the directions by controlling the DIR (AB/BA) as shown in the table above. Also we can reduce the input leakage current by disabling the inputs by using the OE pin as shown in the table above. The output voltage will always be equal to the Vcc voltage, so here since we are converting the 3.3V to 5V we should power the Vcc pin with +5V as shown above.

-Used in address bus buffers

-Used in data bus transceivers

-Used in Logic level converters

-Used in driver IC for communication protocols

-Used in personal computers, PC’s and notebooks

-Used in servers

-Used in wearable health devices

-Used in fitness devices

-Used in telecom infrastructures

Nexperia is a global semiconductor manufacturer headquartered in Nijmegen, the Netherlands. It has front-end factories in Hamburg, Germany and Greater Manchester, England. It is the former Standard Products business unit of NXP Semiconductors (previously as Philips Semiconductors). The company's product range includes bipolar transistors, diodes, ESD protection, TVS diodes, MOSFETs, and logic devices.

Download datasheets and manufacturer documentation for Nexperia USA Inc. 74HC245D,653.