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DM74AS244N bảng dữ liệu(PDF) 1 Page - Fairchild Semiconductor

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Giải thích chi tiết về linh kiện  3-STATE Bus Driver/Receiver
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© 2000 Fairchild Semiconductor Corporation
DS006298
www.fairchildsemi.com
October 1986
Revised March 2000
DM74AS240 • DM74AS244
3-STATE Bus Driver/Receiver
General Description
This family of Advance Schottky 3-STATE Bus circuits are
designed to provide either bidirectional or unidirectional
buffer interface in Memory, Microprocessor, and Communi-
cation Systems. The output characteristics of the circuits
have low impedance sufficient to drive terminated trans-
mission lines down to 133
Ω. The input characteristics of
the circuits likewise have a high impedance so it will not
significantly load the transmission line. The package con-
tains eight 3-STATE buffers organized with four buffers
having a common 3-STATE enable gate. The DM74AS240
and DM74AS244 are eight wide in a 20 pin package, and
may be used as a 4 wide bidirectional or eight wide unidi-
rectional. The buffer selection includes inverting and non-
inverting, with enable or disable 3-STATE control.
Features
s Advanced oxide-isolated, ion-implanted Schottky TTL
process
s Improved switching performance with less power dissi-
pation compared with Schottky counterpart
s Functional and pin compatible with 74LS and Schottky
counterpart
s Switching response specified into 500
Ω and 50 pF
s Specified to interface with CMOS at VOH = VCC − 2V
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
DM74AS240
DM74AS244
Function Tables
DM74AS240
DM74AS244
L
= LOW Logic Level
H
= HIGH Logic Level
X
= Either LOW or HIGH Logic Level
Z
= High Impedance
Order Number
Package Number
Package Description
DM74AS240WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74AS240N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74AS244WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74AS244N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Output
G
AY
LL
H
LH
L
HX
Z
Inputs
Output
G
AY
LL
L
LH
H
HX
Z


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