ICs & Logic 20 pins

74HC245 Octal Bus Transceiver

Octal 3-state bidirectional bus transceiver. Used for level shifting 3.3V-5V.

// connector diagram 20 pins

// loading diagram...

// Specifications

Supply Voltage

2V – 6V

Channels

8 bidirectional

Output Current

±8 mA

Package

DIP-20 / SOIC-20

Logic Family

HCMOS

3-State Output

Yes

// Pin Reference Table

Pin	Name	Function	Type
1	DIR	Direction control, HIGH = A to B	I/O
2	A1	Bus A channel 1	I/O
3	A2	Bus A channel 2	I/O
4	A3	Bus A channel 3	I/O
5	A4	Bus A channel 4	I/O
6	A5	Bus A channel 5	I/O
7	A6	Bus A channel 6	I/O
8	A7	Bus A channel 7	I/O
9	A8	Bus A channel 8	I/O
10	GND	Ground	GND
11	B8	Bus B channel 8	I/O
12	B7	Bus B channel 7	I/O
13	B6	Bus B channel 6	I/O
14	B5	Bus B channel 5	I/O
15	B4	Bus B channel 4	I/O
16	B3	Bus B channel 3	I/O
17	B2	Bus B channel 2	I/O
18	B1	Bus B channel 1	I/O
19	OE	Output enable, active low	I/O
20	VCC	Supply voltage	PWR

The 74HC245 is an octal 3-state non-inverting bus transceiver. It buffers 8 bidirectional signals and is commonly used for level-shifting between 3.3V and 5V logic or to drive bus lines.