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Giải thích chi tiết về linh kiện  Octal 3-State Noninverting Buffer/Line Driver/ Line Receiver
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© Semiconductor Components Industries, LLC, 2014
September, 2014 − Rev. 14
1
Publication Order Number:
MC74HCT244A/D
MC74HCT244A
Octal 3-State Noninverting
Buffer/Line Driver/
Line Receiver with
LSTTL-Compatible Inputs
High−Performance Silicon−Gate CMOS
The MC74HCT244A is identical in pinout to the LS244. This
device may be used as a level converter for interfacing TTL or NMOS
outputs to High−Speed CMOS inputs. The HCT244A is an octal
noninverting buffer line driver line receiver designed to be used with
3−state memory address drivers, clock drivers, and other bus−oriented
systems. The device has non−inverted outputs and two active−low
output enables.
The HCT244A is the non−inverting version of the HCT240. See
also HCT241.
Features
Output Drive Capability: 15 LSTTL Loads
TTL NMOS−Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 4.5 to 5.5 V
Low Input Current: 1 mA
In Compliance with the Requirements Defined by JEDEC Standard
No. 7 A
Chip Complexity: 112 FETs or 28 Equivalent Gates
NLV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
These Devices are Pb−Free and are RoHS Compliant
Figure 1. Logic Diagram
DATA INPUTS
A1
A2
A3
A4
B1
B2
B3
B4
17
15
13
11
8
6
4
218
16
14
12
9
7
5
3
YB4
YB3
YB2
YB1
YA4
YA3
YA2
YA1
NONINVERTING
OUTPUTS
PIN 20 = VCC
PIN 10 = GND
OUTPUT
ENABLES
ENABLE A
ENABLE B
1
19
PIN ASSIGNMENT
A3
A2
YB4
A1
ENABLE A
GND
YB1
A4
YB2
YB3
5
4
3
2
1
10
9
8
7
6
14
15
16
17
18
19
20
11
12
13
YA2
B4
YA1
ENABLE B
VCC
B1
YA4
B2
YA3
B3
http://onsemi.com
SOIC−20W
DW SUFFIX
CASE 751D
TSSOP−20
DT SUFFIX
CASE 948E
See detailed ordering and shipping information on page 5 of
this data sheet.
ORDERING INFORMATION
FUNCTION TABLE
Inputs
Outputs
Enable A,
Enable B
A, B
YA, YB
LL
L
LH
H
HX
Z
Z = high impedance, X = don’t care
MARKING DIAGRAMS
SOIC−20W
TSSOP−20
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W = Work Week
G or
G = Pb−Free Package
(Note: Microdot may be in either location)
1
20
HCT
244A
ALYW
G
G
20
1
HCT244A
AWLYYWWG


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