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DM74AS245

Description
Octal Bus Transceiver with 3-STATE Outputs
File Size59KB,5 Pages
ManufacturerFairchild
Websitehttp://www.fairchildsemi.com/
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DM74AS245 Overview

Octal Bus Transceiver with 3-STATE Outputs

DM74AS245 Octal Bus Transceiver with 3-STATE Outputs
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 133Ω
s
Switching response specified into 500Ω/50 pF
s
Specified to interface with CMOS at V
OH
=
V
CC
2V
s
PNP inputs reduce input loading
s
Switching specifications guaranteed over full
temperature and V
CC
range
Ordering Code:
Order Number
DM74AS245WM
DM74AS245SJ
DM74AS245N
Package Number
M20B
M20D
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
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
L
L
H
DIR
L
H
X
B Data to A Bus
A Data to B Bus
Hi-Z
Operation
© 2000 Fairchild Semiconductor Corporation
DS006299
www.fairchildsemi.com

DM74AS245 Related Products

DM74AS245 DM74AS245N DM74AS245SJ DM74AS245WM
Description Octal Bus Transceiver with 3-STATE Outputs Octal Bus Transceiver with 3-STATE Outputs Octal Bus Transceiver with 3-STATE Outputs Octal Bus Transceiver with 3-STATE Outputs
Is it Rohs certified? - conform to incompatible conform to
Parts packaging code - DIP SOIC SOIC
package instruction - DIP, DIP20,.3 SOP, SOP20,.3 0.300 INCH, MS-013, SOIC-20
Contacts - 20 20 20
Reach Compliance Code - unknown unknow unknown
Other features - WITH DIRECTION CONTROL WITH DIRECTION CONTROL WITH DIRECTION CONTROL
Control type - COMMON CONTROL COMMON CONTROL COMMON CONTROL
Counting direction - BIDIRECTIONAL BIDIRECTIONAL BIDIRECTIONAL
series - AS AS AS
JESD-30 code - R-PDIP-T20 R-PDSO-G20 R-PDSO-G20
length - 26.075 mm 12.6 mm 12.8 mm
Logic integrated circuit type - BUS TRANSCEIVER BUS TRANSCEIVER BUS TRANSCEIVER
MaximumI(ol) - 0.048 A 0.048 A 0.048 A
Number of digits - 8 8 8
Number of functions - 1 1 1
Number of ports - 2 2 2
Number of terminals - 20 20 20
Maximum operating temperature - 70 °C 70 °C 70 °C
Output characteristics - 3-STATE 3-STATE 3-STATE
Output polarity - TRUE TRUE TRUE
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - DIP SOP SOP
Encapsulate equivalent code - DIP20,.3 SOP20,.3 SOP20,.4
Package shape - RECTANGULAR RECTANGULAR RECTANGULAR
Package form - IN-LINE SMALL OUTLINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) - NOT SPECIFIED NOT SPECIFIED 260
power supply - 5 V 5 V 5 V
Maximum supply current (ICC) - 149 mA 149 mA 149 mA
propagation delay (tpd) - 7.5 ns 7.5 ns 7.5 ns
Certification status - Not Qualified Not Qualified Not Qualified
Maximum seat height - 5.08 mm 2.1 mm 2.65 mm
Maximum supply voltage (Vsup) - 5.5 V 5.5 V 5.5 V
Minimum supply voltage (Vsup) - 4.5 V 4.5 V 4.5 V
Nominal supply voltage (Vsup) - 5 V 5 V 5 V
surface mount - NO YES YES
technology - TTL TTL TTL
Temperature level - COMMERCIAL COMMERCIAL COMMERCIAL
Terminal form - THROUGH-HOLE GULL WING GULL WING
Terminal pitch - 2.54 mm 1.27 mm 1.27 mm
Terminal location - DUAL DUAL DUAL
Maximum time at peak reflow temperature - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
translate - N/A N/A N/A
width - 7.62 mm 5.3 mm 7.5 mm
Base Number Matches - 1 1 1
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