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MC74HCT245ADT View Datasheet(PDF) - ON Semiconductor

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MC74HCT245ADT Datasheet PDF : 9 Pages
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MC74HCT245A
Octal 3−State Noninverting
Bus Transceiver with LSTTL
Compatible Inputs
High−Performance Silicon−Gate CMOS
The MC74HCT245A is identical in pinout to the LS245. This
device may be used as a level converter for interfacing TTL or NMOS
outputs to High Speed CMOS inputs.
The MC74HCT245A is a 3−state noninverting transceiver that is
used for 2−way asynchronous communication between data buses.
The device has an active−low Output Enable pin, which is used to
place the I/O ports into high−impedance states. The Direction control
determines whether data flows from A to B or from B to A.
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 V to 5.5 V
Low Input Current: 1.0 mA
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
Chip Complexity: 304 FETs or 76 Equivalent Gates
Pb−Free Packages are Available
A
DATA
PORT
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
B
DATA
PORT
DIRECTION 1
OUTPUT ENABLE 19
PIN 20 = VCC
PIN 10 = GND
Figure 1. Logic Diagram
Design Criteria
Internal Gate Count*
Internal Gate Propagation Delay
Internal Gate Power Dissipation
Speed Power Product
*Equivalent to a two−input NAND gate.
Value
76
1.0
5.0
0.005
Units
ea
ns
mW
pJ
FUNCTION TABLE
Control Inputs
Output Enable Direction
L
L
L
H
H
X
X = Don’t Care
Operation
Data Transmitted from Bus B to Bus A
Data Transmitted from Bus A to Bus B
Buses Isolated (High−Impedance State)
© Semiconductor Components Industries, LLC, 2007
1
January, 2007 − Rev. 10
http://onsemi.com
1
1
PDIP−20
N SUFFIX
CASE 738
SOIC−20W
DW SUFFIX
CASE 751D
TSSOP−20
DT SUFFIX
CASE 948E
1
SOEIAJ−20
F SUFFIX
CASE 967
1
PIN ASSIGNMENT
DIRECTION 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
20 VCC
19 OUTPUT ENABLE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
ORDERING INFORMATION
See detailed ordering, shipping information, and marking
information in the package dimensions section on page 6 of
this data sheet.
Publication Order Number:
MC74HCT245A/D
 

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