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PDF DM74AS245 Datasheet ( Hoja de datos )

Número de pieza DM74AS245
Descripción Octal Bus Transceiver with 3-STATE Outputs
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo

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DM74AS245 Hoja de datos, Descripción, Manual
October 1986
Revised February 2000
DM74AS245
Octal Bus Transceiver with 3-STATE Outputs
General Description
This advanced Schottky device contains 8 pairs of
3-STATE logic elements configured as octal bus transceiv-
ers. These circuits are designed for use in memory, micro-
processor systems and in asynchronous bidirectional data
buses. Two way communication between buses is con-
trolled by the (DIR) input. Data transmits either from the A
bus to the B bus or from the B bus to the A bus. Both the
driver and receiver outputs can be disabled via the (G)
enable input which causes outputs to enter the high imped-
ance mode so that the buses are effectively isolated.
Features
s Advanced oxide-isolated, ion-implanted Schottky
TTL process
s Non-inverting logic output
s 3-STATE outputs independently controlled on
A and B buses
s Low output impedance to drive terminated transmission
lines to 133
s Switching response specified into 500/50 pF
s Specified to interface with CMOS at VOH = VCC 2V
s PNP inputs reduce input loading
s Switching specifications guaranteed over full
temperature and VCC range
Ordering Code:
Order Number Package Number
Package Description
DM74AS245WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74AS245SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74AS245N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Control
Inputs
G DIR
LL
LH
HX
Operation
B Data to A Bus
A Data to B Bus
Hi-Z
© 2000 Fairchild Semiconductor Corporation DS006299
www.fairchildsemi.com

1 page

DM74AS245 pdf
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N20A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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