Datasheet

1OE
A1
x
x
x
A4
GND
V
CC
SN74HCT244
MCU or
System
Logic
Regulated 5V
MCU
System
Logic
LEDS
Y1
x
x
x
Y4
x
x
x
x
x
x
Copyright © 2016, Texas Instruments Incorporated
10
SN54HCT244 , SN74HCT244
SCLS175E –MONTH 2003–REVISED AUGUST 2016 www.ti.com
Product Folder Links: SN54HCT244 SN74HCT244
Submit Documentation Feedback Copyright © 2003–2016, Texas Instruments Incorporated
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The SN74HC244 is a high-drive CMOS device that can be used for a multitude of bus interface type applications
where output drive or PCB trace length is a concern.
9.2 Typical Application
Figure 4. Application Schematic
9.2.1 Design Requirements
This device uses CMOS technology and has balanced output drive. Avoid bus contention because it can drive
currents in excess of maximum limits. The high drive creates fast edges into light loads, so consider routing and
load conditions to prevent ringing.
9.2.2 Detailed Design Procedure
1. Recommended input conditions:
– For rise time and fall time specifications, see Δt/ΔV in Recommended Operating Conditions.
– For specified high and low levels, see V
IH
and V
IL
in Recommended Operating Conditions.
2. Recommend output conditions:
– Load currents must not exceed the I
O
maximum per output and must not exceed the continuous current
through V
CC
or GND total current for the part. These limits are located in Absolute Maximum Ratings.
– Outputs must not be pulled above V
CC
.