Datasheet

DIR
OE
A1
B1
1
2
18
19
To Seven Other Channels
Copyright © 2016, Texas Instruments Incorporated
9
SN54HCT245 , SN74HCT245
www.ti.com SCLS020F –MARCH 1984–REVISED AUGUST 2016
Product Folder Links: SN54HCT245 SN74HCT245
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8 Detailed Description
8.1 Overview
The SNx4HCT245 is a bidirectional buffer with direction control and active low output enable. This device is
commonly used in logic systems for isolation and increasing drive strength.
8.2 Functional Block Diagram
Figure 3. Logic Diagram (Positive Logic)
8.3 Feature Description
Voltage operating range from 4.5 V to 5.5 V is forgiving of 5-V power supply rail accuracy. Outputs can operate
up to 15 LSTTL loads. This device has balanced propagation delay, typically 14 ns, and balanced output drive of
±6 mA at 5 V. It has low power consumption of only 80-µA maximum static supply current. The center V
CC
and
GND pin configurations minimize high-speed switching noise. Inputs are TTL-voltage compatible.
8.4 Device Functional Modes
This device is a standard '245 logic function. It has an active low output enable, a direction pin, and eight
communication channels.
Table 1. Function Table
INPUTS
OPERATION
OE DIR
L L B data to A bus
L H A data to B bus
H X Isolation