900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




National Semiconductor Electronic Components Datasheet

74LS245 Datasheet

TRI-STATE Octal Bus Transceiver

No Preview Available !

June 1989
54LS245 DM54LS245 DM74LS245
TRI-STATE Octal Bus Transceiver
General Description
These octal bus transceivers are designed for asynchro-
nous two-way communication between data buses The
control function implementation minimizes external timing
requirements
The device allows data transmission from the A bus to the B
bus or from the B bus to the A bus depending upon the logic
level at the direction control (DIR) input The enable input
(G) can be used to disable the device so that the buses are
effectively isolated
Features
Y Bi-Directional bus transceiver in a high-density 20-pin
package
Y TRI-STATE outputs drive bus lines directly
Y PNP inputs reduce DC loading on bus lines
Y Hysteresis at bus inputs improve noise margins
Y Typical propagation delay times port-to-port 8 ns
Y Typical enable disable times 17 ns
Y IOL (sink current)
54LS 12 mA
74LS 24 mA
Y IOH (source current)
54LS b12 mA
74LS b15 mA
Y Alternate Military Aerospace device (54LS245) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
Order Number 54LS245DMQB 54LS245FMQB 54LS245LMQB
DM54LS245J DM54LS245W DM74LS245WM or DM74LS245N
See NS Package Number E20A J20A M20B N20A or W20A
Function Table
Enable
G
Direction
Control
DIR
Operation
L L B data to A bus
L H A data to B bus
HX
Isolation
H e High Level L e Low Level X e Irrelevant
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 6413
TL F 6413 – 1
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

74LS245 Datasheet

TRI-STATE Octal Bus Transceiver

No Preview Available !

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
DIR or G
7V
A or B
5 5V
Operating Free Air Temperature Range
DM54LS and 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
DM54LS245
Nom
5
Max
55
07
b12
12
125
DM74LS245
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
VI
HYS
VOH
VOL
Input Clamp Voltage
Hysteresis (VTa b VTb)
High Level Output Voltage
Low Level Output Voltage
VCC e Min II e b18 mA
VCC e Min
VCC e Min VIH e Min
VIL e Max IOH e b1 mA
VCC e Min VIL 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
DM74
DM54 DM74
DM54 DM74
DM74
DM54
DM74
IOZH
IOZL
Off-State Output Current
High Level Voltage Applied
Off-State Output Current
Low Level Voltage Applied
VCC e Max
VIL e Max
VIH e Min
VO e 2 7V
VO e 0 4V
II
Input Current at Maximum
VCC e Max A or B
VI e 5 5V
Input Voltage
DIR or G
VI e 7V
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)
ICC Supply Current
Outputs High
VCC e Max
Outputs Low
Outputs at Hi-Z
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 not to exceed one second duration
Min
02
27
24
2
b40
Typ
(Note 1)
04
34
48
62
64
Max
b1 5
04
04
05
20
b200
01
01
20
b0 2
b225
70
90
95
Units
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
2


Part Number 74LS245
Description TRI-STATE Octal Bus Transceiver
Maker National Semiconductor
PDF Download

74LS245 Datasheet PDF






Similar Datasheet

1 74LS240 LOW POWER SCHOTTKY
ON Semiconductor
2 74LS240 Octal 3-STATE Buffer/Line Driver/Line Receiver
Fairchild Semiconductor
3 74LS240 Octal Buffers/Line Drivers/Line Receivers
Hitachi Semiconductor
4 74LS240 Octal TRI-STATE Buffers/Line Drivers/Line Receivers
National Semiconductor
5 74LS240 LSTTL eight-Buffer / Bus Driver
BDTIC
6 74LS241 Octal Buffers/Line Drivers/Line Receivers
Hitachi Semiconductor
7 74LS241 Octal 3-STATE Buffer/Line Driver/Line Receiver
Fairchild Semiconductor
8 74LS241 Octal TRI-STATE Buffers/Line Drivers/Line Receivers
National Semiconductor
9 74LS241 OCTAL BUFFER/LINE DRIVER
Motorola





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy