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SN74HC245N

Octal bus transceiver, 3-state, DIR control, 2-6V HC, DIP-20, bidirectional buffering

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Manufacturer Part：

SN74HC245N

Package：

DIP-20 (24.33 x 6.35 x 5.08 mm)

Brand：

Product Categories：

Integrated Circuits ICs

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Description

Product Overview

The SN74HC245N from Texas Instruments is an octal bus transceiver with 3-state outputs in a DIP-20 package. With active-high and active-low output enable controls and 6mA output drive, it provides bidirectional bus buffering for HC-compatible digital systems.

Key Specifications

Function	Octal bus transceiver with 3-state outputs
Supply Voltage	2 V to 6 V
Output Drive	+/-6 mA
Propagation Delay	12 ns (typical at 5V)
Direction Control	DIR pin (A-to-B or B-to-A)
Operating Temperature	-40C to +85C

Features

Octal bidirectional bus transceiver with 3-state outputs
DIR pin selects A-to-B or B-to-A data flow direction
Dual output enable (active-low OE and active-high OE)
HC-compatible CMOS logic with 2-6V supply range
DIP-20 through-hole package for prototyping
6mA output drive for bus interface buffering

Applications

Microprocessor system address/data bus buffering
Bidirectional level translation between logic domains
Bus isolation and expansion in digital systems
Prototyping and breadboard digital logic design

Product Introduction:SN74HC245N Product Introduction

The SN74HC245N from Texas Instruments is an octal bus transceiver with 3-state outputs in a DIP-20 through-hole package. The device provides bidirectional data flow between the A bus (pins A1-A8) and B bus (pins B1-B8), controlled by the DIR (direction) input. When DIR is high, data flows from A to B; when DIR is low, data flows from B to A. The output enable (OE) input, when high, places both A and B outputs in the high-impedance (3-state) condition, effectively isolating the buses. The device operates from 2V to 6V supply voltage with 6mA output drive capability, making it compatible with HC and HCT logic families. The 12ns typical propagation delay at 5V supports moderate-speed bus operations. The DIP-20 package is ideal for prototyping and educational applications where through-hole mounting is preferred.

Working Principle:SN74HC245N Working Principle

The SN74HC245N uses CMOS transmission gates for bidirectional bus control. (1) Direction Control: The DIR input controls the data flow direction through internal multiplexing. When DIR is high, the A-side buffers are configured as inputs and the B-side buffers as outputs (A-to-B mode). When DIR is low, the B-side buffers are inputs and the A-side buffers are outputs (B-to-A mode). (2) Output Enable: The active-low OE input controls the 3-state output buffers. When OE is low, the selected direction outputs are enabled. When OE is high, both A and B outputs are in the high-impedance state, disconnecting the device from both buses. (3) Bus Isolation: The 3-state capability allows multiple bus transceivers to share the same bus lines. Only one transceiver should be enabled at a time to avoid bus contention. (4) CMOS Structure: The internal buffers use complementary N-channel and P-channel MOSFETs, providing rail-to-rail output swing and low static power consumption.

Pin Description:SN74HC245N Pin Definition and Functions

Pin	Name	Type	Function
1	DIR	Input	Direction control (H=A-to-B, L=B-to-A)
2-9	A1-A8	I/O	Bus A data lines
10	GND	Ground	Ground
11-18	B8-B1	I/O	Bus B data lines
19	OE	Input	Output enable (active low)
20	VCC	Power	Supply voltage (2-6V)

Application Scenarios:In which products and applications isSN74HC245N used

Microprocessor system address/data bus buffering with DIR and OE control
Bidirectional level translation between 3.3V and 5V logic domains
Bus isolation and expansion in digital systems with 3-state outputs
Prototyping and breadboard digital logic design in DIP-20 package

Alternative Models:What chips are recommended as replacements for SN74HC245N

Manufacturer	Part Number	Package	Notes
TI	SN74HC245DW	SOIC-20	Surface-mount version
Nexperia	74HC245D	SOIC-20	Direct equivalent
onsemi	MC74HC245AN	DIP-20	Direct equivalent
TI	SN74LVC245AN	DIP-20	3.3V LVC version