Drivers/Line Receivers. 54LS244 Datasheet

54LS244 Receivers. Datasheet pdf. Equivalent

54LS244 Datasheet
Recommendation 54LS244 Datasheet
Part 54LS244
Description Octal TRI-STATE Buffers/Line Drivers/Line Receivers
Feature 54LS244; 54LS244 DM74LS244 Octal TRI-STATE Buffers Line Drivers Line Receivers August 1989 54LS244 DM74LS24.
Manufacture National Semiconductor
Datasheet
Download 54LS244 Datasheet




National Semiconductor 54LS244
August 1989
54LS244 DM74LS244 Octal TRI-STATE
Buffers Line Drivers Line Receivers
General Description
These buffers line drivers are designed to improve both the
performance and PC board density of TRI-STATE buffers
drivers employed as memory-address drivers clock drivers
and bus-oriented transmitters receivers Featuring 400 mV
of hysteresis at each low current PNP data line input they
provide improved noise rejection and high fanout outputs
and can be used to drive terminated lines down to 133X
Features
Y TRI-STATE outputs drive bus lines directly
Y PNP inputs reduce DC loading on bus lines
Y Hysteresis at data inputs improves noise margins
Y Typical IOL (sink current)
54LS 12 mA
74LS 24 mA
Y Typical IOH (source current)
54LS b12 mA
74LS b15 mA
Y Typical propagation delay times
Inverting
10 5 ns
Noninverting 12 ns
Y Typical enable disable time 18 ns
Y Typical power dissipation (enabled)
Inverting
130 mW
Noninverting 135 mW
Connection Diagram
Dual-In-Line Package
TL F 8442 – 1
Order Number 54LS244DMQB 54LS244FMQB 54LS244LMQB
DM74LS244WM or DM74LS244N
See NS Package Number E20A J20A M20B N20A or W20A
Function Table
Inputs
Output
GA
Y
LL
LH
HX
L
H
Z
L e Low Logic Level
H e High Logic Level
X e Either Low or High Logic Level
Z e High Impedance
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 8442
RRD-B30M105 Printed in U S A



National Semiconductor 54LS244
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
54LS
b55 C to a125 C
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table 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
45
2
b55
54LS244
Nom
5
Max
55
07
b12
12
125
DM74LS244
Min Nom Max
4 75 5 5 25
2
08
b15
24
0 70
Units
V
V
V
mA
mA
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI
HYS
Input Clamp Voltage
Hysteresis (VTa b VTb)
Data Inputs Only
VCC e Min II e b18 mA
VCC e Min
VOH
VOL
IOZH
IOZL
High Level Output Voltage
Low Level Output Voltage
Off-State Output Current
High Level Voltage Applied
Off-State Output Current
Low Level Voltage Applied
VCC e Min VIH e Min
VIL e Max IOH e b1 mA
VCC e Min VIH e Min
VIL e Max IOH e b3 mA
VCC e Min VIH e Min
VIL e 0 5V IOH e Max
VCC e Min
VIL e Max
VIH e Min
IOL e 12 mA
IOL e Max
VCC e Max
VIL e Max
VIH e Min
VO e 2 7V
VO e 0 4V
DM74
54LS DM74
54LS DM74
54LS DM74
DM74
II
Input Current at Maximum
VCC e Max
VI e 7V (DM74)
Input Voltage
VI e 10V (54LS)
IIH
High Level Input Current
VCC e Max
VI e 2 7V
IIL
Low Level Input Current
VCC e Max
VI e 0 4V
IOS Short Circuit Output Current VCC e Max (Note 2)
54LS
DM74
ICC Supply Current
VCC e Max
Outputs High
Outputs Open Outputs Low
Outputs Disabled
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
02
27
24
2
b0 5
b50
b40
Typ
(Note 1)
04
34
13
27
32
Max
b1 5
04
05
20
b20
01
20
b200
b225
23
46
54
Units
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
2



National Semiconductor 54LS244
Switching Characteristics at VCC e 5V TA e 25 C (see Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
Conditions
54LS Max
DM74LS Max
Units
tPLH
tPHL
tPZL
tPZH
tPLZ
tPHZ
tPLH
tPHL
tPZL
tPZH
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Output Enable Time to
Low Level
Output Enable Time to
High Level
Output Disable Time
from Low Level
Output Disable Time
from High Level
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Output Enable Time to
Low Level
Output Enable Time to
High Level
CL e 45 pF
RL e 667X
CL e 45 pF
RL e 667X
CL e 45 pF
RL e 667X
CL e 45 pF
RL e 667X
CL e 5 pF
RL e 667X
CL e 5 pF
RL e 667X
CL e 150 pF
RL e 667X
CL e 150 pF
RL e 667X
CL e 150 pF
RL e 667X
CL e 150 pF
RL e 667X
18
18
30
23
25
18
18 ns
18 ns
30 ns
23 ns
25 ns
18 ns
21 ns
22 ns
33 ns
26 ns
Note 54LS Output Load is CL e 50 pF for tPLH tPHL tPZL and tPZH
3







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