74AS244 DM74AS244 Datasheet

74AS244 Datasheet PDF, Equivalent


Part Number

74AS244

Description

DM74AS244

Manufacture

Fairchild Semiconductor

Total Page 5 Pages
Datasheet
Download 74AS244 Datasheet


74AS244
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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. 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 500and 50 pF
s Specified to interface with CMOS at VOH = VCC 2V
Ordering Code:
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
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
GA
LL
LH
HX
L = LOW Logic Level
Output
Y
H
L
Z
H = HIGH Logic Level
DM74AS244
Inputs
Output
GA
LL
LH
HX
Y
L
H
Z
X = Either LOW or HIGH Logic Level Z = High Impedance
© 2000 Fairchild Semiconductor Corporation DS006298
www.fairchildsemi.com

74AS244
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Absolute Maximum Ratings(Note 1)
Supply Voltage, VCC
Input Voltage
Voltage Applied to Disabled Output
Operating Free Air Temperature Range
Storage Temperature Range
Typical θJA
N Package
M Package
7V
7V
5.5V
0°C to +70°C
65°C to +150°C
57.0°C/W
76.0°C/W
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
Min
Nom
Max
Units
4.5 5 5.5 V
2V
0.8 V
15 mA
64 mA
0 70 °C
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.
Symbol
Parameter
Conditions
Min Typ
Max
VIK Input Clamp Voltage
VCC = 4.5V, IIN = −18 mA
VOH HIGH Level
VCC = 4.5V, IOH = −3 mA
Output Voltage
VCC = 4.5V, IOH = Max
IOH = −2 mA, VCC = 4.5V to 5.5V
VOL LOW Level Output Voltage
VCC = 4.5V, IOL = Max
II
Input Current at Max Input Voltage VCC = 5.5V
VIN = 7V
Others
IIH HIGH Level Input Current
VCC = 5.5V, VIN = 2.7V
Others
2.4
2.4
VCC2
3.2
0.35
1.2
0.55
100
20
IIL LOW Level Input Current
VCC = 5.5V, VIN = 0.4V
AS240, (G, G),
(Control Inputs),
500
DM74AS244 (G)
DM74AS244 (A)
1000
IOZH
IOZL
HIGH Level 3-STATE Output Current VCC = 5.5V, V= 2.7V
LOW Level 3-STATE
Output Current
VCC = 5.5V, V = 0.4V
DM74AS240,
DM74AS244
50
50
IO (Note 2)
ICC
Output Drive Current
DM74AS240
Supply Current
VCC = 5.5V, VOUT = 2.25V
VCC = 5.5V
Outputs HIGH
Outputs LOW
50
115
150
11 17
51 75
3-STATE
24 38
ICC DM74AS244
Supply Current
VCC = 5.5V
Outputs HIGH
Outputs LOW
22 34
60 90
3-STATE
34 54
Note 2: The output conditions have been chosen to produce a current that closely approximates one half the true short-circuit output current, IOS.
Units
V
V
V
µA
µA
µA
µA
µA
mA
mA
mA
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2


Features w w w . D a t a S h e e t 4 U . c o m D M74AS240 • DM74AS244 3-STATE Bus Driv er/Receiver October 1986 Revised March 2000 DM74AS240 • DM74AS244 3-STATE Bus Driver/Receiver General Description This family of Advance Schottky 3-STAT E Bus circuits are designed to provide either bidirectional or unidirectional buffer interface in Memory, Microproces sor, and Communication Systems. The out put characteristics of the circuits hav e low impedance sufficient to drive ter minated transmission lines down to 133 . The input characteristics of the ci rcuits likewise have a high impedance s o it will not significantly load the tr ansmission line. The package contains e ight 3-STATE buffers organized with fou r buffers having a common 3-STATE enabl e gate. The DM74AS240 and DM74AS244 are eight wide in a 20 pin package, and ma y be used as a 4 wide bidirectional or eight wide unidirectional. The buffer s election includes inverting and noninve rting, with enable or disable 3-STATE control. Features s Advanced o.
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