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DM74AS244

Description
3-STATE Bus Driver/Receiver
File Size50KB,5 Pages
ManufacturerFairchild
Websitehttp://www.fairchildsemi.com/
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DM74AS244 Overview

3-STATE Bus Driver/Receiver

DM74AS240 • DM74AS244 3-STATE Bus Driver/Receiver
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 133Ω. 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 500Ω and 50 pF
s
Specified to interface with CMOS at V
OH
=
V
CC
2V
Ordering Code:
Order Number
DM74AS240WM
DM74AS240N
DM74AS244WM
DM74AS244N
Package Number
M20B
N20A
M20B
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 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 Diagrams
DM74AS240
DM74AS244
Function Tables
DM74AS240
Inputs
G
L
L
H
A
L
H
X
Output
Y
H
L
Z
H
=
HIGH Logic Level
DM74AS244
Inputs
G
L
L
H
X
=
Either LOW or HIGH Logic Level
Output
A
L
H
X
Y
L
H
Z
L
=
LOW Logic Level
Z
=
High Impedance
© 2000 Fairchild Semiconductor Corporation
DS006298
www.fairchildsemi.com

DM74AS244 Related Products

DM74AS244 DM74AS244N DM74AS240 DM74AS244WM DM74AS240N DM74AS240WM
Description 3-STATE Bus Driver/Receiver 3-STATE Bus Driver/Receiver 3-STATE Bus Driver/Receiver 3-STATE Bus Driver/Receiver 3-STATE Bus Driver/Receiver 3-STATE Bus Driver/Receiver
Is it Rohs certified? - conform to - conform to conform to conform to
Parts packaging code - DIP - SOIC DIP SOIC
package instruction - 0.300 INCH, PLASTIC, MS-001, DIP-20 - SOP, SOP20,.4 DIP, DIP20,.3 SOP, SOP20,.4
Contacts - 20 - 20 20 20
Reach Compliance Code - unknow - unknow compli unknow
Control type - ENABLE LOW - ENABLE LOW ENABLE LOW ENABLE LOW
series - AS - AS AS AS
JESD-30 code - R-PDIP-T20 - R-PDSO-G20 R-PDIP-T20 R-PDSO-G20
JESD-609 code - e3 - e3 e3 e3
length - 26.075 mm - 12.8 mm 26.075 mm 12.8 mm
Logic integrated circuit type - BUS DRIVER - BUS DRIVER BUS DRIVER BUS DRIVER
MaximumI(ol) - 0.064 A - 0.064 A 0.064 A 0.064 A
Number of digits - 4 - 4 4 4
Number of functions - 2 - 2 2 2
Number of ports - 2 - 2 2 2
Number of terminals - 20 - 20 20 20
Maximum operating temperature - 70 °C - 70 °C 70 °C 70 °C
Output characteristics - 3-STATE - 3-STATE 3-STATE 3-STATE
Output polarity - TRUE - TRUE INVERTED INVERTED
Package body material - PLASTIC/EPOXY - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - DIP - SOP DIP SOP
Encapsulate equivalent code - DIP20,.3 - SOP20,.4 DIP20,.3 SOP20,.4
Package shape - RECTANGULAR - RECTANGULAR RECTANGULAR RECTANGULAR
Package form - IN-LINE - SMALL OUTLINE IN-LINE SMALL OUTLINE
Peak Reflow Temperature (Celsius) - NOT APPLICABLE - 260 NOT APPLICABLE 260
power supply - 5 V - 5 V 5 V 5 V
Maximum supply current (ICC) - 90 mA - 90 mA 75 mA 75 mA
Prop。Delay @ Nom-Su - 6.2 ns - 6.2 ns 6.5 ns 6.5 ns
propagation delay (tpd) - 6.2 ns - 6.2 ns 6.5 ns 6.5 ns
Certification status - Not Qualified - Not Qualified Not Qualified Not Qualified
Maximum seat height - 5.08 mm - 2.65 mm 5.08 mm 2.65 mm
Maximum supply voltage (Vsup) - 5.5 V - 5.5 V 5.5 V 5.5 V
Minimum supply voltage (Vsup) - 4.5 V - 4.5 V 4.5 V 4.5 V
Nominal supply voltage (Vsup) - 5 V - 5 V 5 V 5 V
surface mount - NO - YES NO YES
technology - TTL - TTL TTL TTL
Temperature level - COMMERCIAL - COMMERCIAL COMMERCIAL COMMERCIAL
Terminal surface - Matte Tin (Sn) - Matte Tin (Sn) Matte Tin (Sn) Matte Tin (Sn)
Terminal form - THROUGH-HOLE - GULL WING THROUGH-HOLE GULL WING
Terminal pitch - 2.54 mm - 1.27 mm 2.54 mm 1.27 mm
Terminal location - DUAL - DUAL DUAL DUAL
Maximum time at peak reflow temperature - NOT APPLICABLE - NOT SPECIFIED NOT APPLICABLE NOT SPECIFIED
width - 7.62 mm - 7.5 mm 7.62 mm 7.5 mm
Base Number Matches - 1 - 1 1 1
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