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MC74HCT245A_07 Datasheet, PDF (1/9 Pages) ON Semiconductor – Octal 3−State Noninverting Bus Transceiver with LSTTL Compatible Inputs | |||
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MC74HCT245A
Octal 3âState Noninverting
Bus Transceiver with LSTTL
Compatible Inputs
HighâPerformance SiliconâGate 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 3âstate noninverting transceiver that is
used for 2âway asynchronous communication between data buses.
The device has an activeâlow Output Enable pin, which is used to
place the I/O ports into highâimpedance 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
⢠PbâFree 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 twoâinput 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 = Donât Care
Operation
Data Transmitted from Bus B to Bus A
Data Transmitted from Bus A to Bus B
Buses Isolated (HighâImpedance State)
© Semiconductor Components Industries, LLC, 2007
1
January, 2007 â Rev. 10
http://onsemi.com
1
1
PDIPâ20
N SUFFIX
CASE 738
SOICâ20W
DW SUFFIX
CASE 751D
TSSOPâ20
DT SUFFIX
CASE 948E
1
SOEIAJâ20
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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