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74ALS244 PDF даташит

Спецификация 74ALS244 изготовлена ​​​​«Fairchild Semiconductor» и имеет функцию, называемую «Octal 3-STATE Bus Driver».

Детали детали

Номер произв 74ALS244
Описание Octal 3-STATE Bus Driver
Производители Fairchild Semiconductor
логотип Fairchild Semiconductor логотип 

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74ALS244 Даташит, Описание, Даташиты
September 1986
Revised February 2000
DM74ALS244A
Octal 3-STATE Bus Driver
General Description
This octal 3-STATE bus driver is designed to provide the
designer with flexibility in implementing a bus interface with
memory, microprocessor, or communication systems. This
device offers 64-extended temperature Grade product
guaranteeing performance from 40°C to +85°C. The out-
put 3-STATE gating control is organized into two separate
groups of four buffers, and both control inputs enable the
respective outputs when set logic LOW. The 3-STATE cir-
cuitry contains a feature that maintains the buffer outputs in
3-STATE (high impedance state) during power supply
ramp-up or ramp-down. This eliminates bus glitching prob-
lems that arise during power-up and power-down.
Features
s Advanced low power oxide-isolated ion-implanted
Schottky TTL process
s Functional and pin compatible with the 74LS counterpart
s Improved switching performance with less power dissi-
pation compared with the 74LS counterpart
s Switching response specified into 500and 50 pF load
s Switching response specifications guaranteed over full
temperature and VCC supply range
s PNP input design reduces input loading
Ordering Code:
Order Number Package Number
Package Description
DM74ALS244AWM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74ALS244ASJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS244AMSA
MSA20
20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide
DM74ALS244AN
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
Logic Diagram
Function Table
Input
Output
GA
Y
LL
L
LH
H
HX
Z
H = HIGH Level Logic State
L = LOW Level Logic State
X = Don't Care (Either LOW or HIGH Level Logic State)
Z = High Impedance (OFF) State
© 2000 Fairchild Semiconductor Corporation DS006212
www.fairchildsemi.com









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74ALS244 Даташит, Описание, Даташиты
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
60.5°C/W
79.8°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
Operating Free-Air Temperature
Min Typ
4.5 5
2
0
Electrical Characteristics
over recommended operating free air temperature (unless otherwise specified)
Symbol
Parameter
Conditions
VIK
VOH
VOL
II
IIH
IIL
IO
IOZH
IOZL
ICC
Input Clamp Voltage
HIGH Level
Output Voltage
VCC = 4.5V, II = −18 mA
VCC = 4.5V to 5.5V
VCC = 4.5V
LOW Level
Output Voltage
Input Current at Maximum Input Voltage
HIGH Level Input Current
LOW Level Input Current
Output Drive Current
HIGH Level 3-STATE Output Current
LOW Level 3-STATE Output Current
Supply Current
VCC = 4.5V
IOL = 24 mA
VCC = 5.5V, VI = 7V
VCC = 5.5V, VI = 2.7V
VCC = 5.5V, VIL = 0.4V
VCC = 5.5V, VO = 2.25V
VCC = 5.5V, VO = 2.7V
VCC = 5.5V, VO = 0.4V
VCC = 5.5V
Outputs HIGH
Outputs LOW
Outputs 3-STATE
IOH = −0.4 mA
IOH = −3 mA
IOH = Max
Min
VCC2
2.4
2
30
Max
5.5
0.8
15
24
70
Typ
0.35
9
15
17
Units
V
V
V
mA
mA
°C
Max
1.5
0.5
0.1
20
0.1
112
20
20
15
24
27
Units
V
V
V
V
V
mA
µA
mA
mA
µA
µA
mA
mA
mA
Switching Characteristics
over recommended operating free-air temperature range
Symbol
Parameter
Conditions
tPLH Propagation Delay Time
LOW-to-HIGH Level Output
tPHL Propagation Delay Time
HIGH-to-LOW Level Output
VCC = 4.5V to 5.5V,
CL = 50 pF,
R1 = 500,
R2 = 500,
tPZH
Output Enable Time to HIGH Level Output
TA = Min to Max
tPZL Output Enable Time to LOW Level Output
tPHZ Output Disable Time from HIGH Level Output
tPLZ Output Disable Time from LOW Level Output
From
(Input)
A
A
G
G
G
G
To
(Output)
Y
Y
Y
Y
Y
Y
Min
3
3
3
3
2
1
Max
10
10
20
20
10
13
Units
ns
ns
ns
ns
ns
ns
www.fairchildsemi.com
2









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74ALS244 Даташит, Описание, Даташиты
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
3 www.fairchildsemi.com










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