900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Fairchild Semiconductor Electronic Components Datasheet

74645 Datasheet

Octal Bus Transceiver

No Preview Available !

August 1986
Revised March 2000
DM74LS645
Octal Bus Transceiver
General Description
These octal bus transceivers are designed for asynchro-
nous two-way communication between data buses. The
devices transmit data from the A bus to the B bus or from
the B bus to the A bus depending upon the 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
s Bi-directional bus transceivers in high-density 20-pin
packages
s Hysteresis at bus inputs improves noise margins
s 3-STATE outputs
Ordering Code:
Order Number Package Number
Package Description
DM74LS645WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS645N
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
Function Table
Control
Inputs
G
L
L
H
H = HIGH Level
L = LOW Level
X = Irrelevant
DIR
L
H
X
DM74LS645
B data to A bus
A data to B bus
Isolation
© 2000 Fairchild Semiconductor Corporation DS009056
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

74645 Datasheet

Octal Bus Transceiver

No Preview Available !

Absolute Maximum Ratings(Note 1)
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
55°C to +150°C
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
Parameter
VCC Supply Voltage (Note 2)
VIH HIGH Level Input Voltage
VIL LOW Level Input Voltage
IOH HIGH Level Output Current
IOL LOW Level Output Current
TA Free Air Operating Temperature
Note 2: Voltage values are with respect to the network ground terminal.
Min
4.75
2
0
Nom
5
Max
5.25
0.6
15
24
70
Units
V
V
V
mA
mA
°C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions (Note 3)
Typ
Min
(Note 4)
VI Input Clamp Voltage
HYS Hysteresis (VT+ V)
A or B Input
VCC = Min, II = 18 mA
VCC = Min
0.2 0.4
VOH
VOL
IOZH
IOZL
II
IIH
IIL
IOS
ICC
HIGH Level Output Voltage
LOW Level Output Voltage
Off-State Output Current,
HIGH Level Voltage Applied
Off-State Output Current,
LOW Level Voltage Applied
Input Current at
Maximum Input Voltage
VCC = Min, VIH = 2V,
VIL = Max
VCC = Min, VIH = 2V,
VIL = Max
VCC = Max, G at 2V,
VO = 2.7V
VCC = Max, G at 2V
VO = 0.4V
VCC = Max
A or B
DIR or G
HIGH Level Input Current
VCC = Max, VIH = 2.7
LOW Level Input Current
VCC = Max, VIL = 0.4V
Short Circuit Output Current (Note 5) VCC = Max
Total Supply
Outputs HIGH
Current
Outputs LOW
IOH = −3 mA
IOH = Max
IOL = 12 mA
IOL = 24 mA
2.4 3.4
2
0.25
0.35
VI = 5.5V
VI = 7V
VCC = Max,
Outputs Open
40
48
62
Outputs at Hi-Z
64
Note 3: For conditions shown as Min or Max, use the appropriate value specified under Recommended Operating Conditions.
Note 4: All typicals are at VCC = 5V, TA = 25°C.
Note 5: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Max
1.5
0.4
0.5
20
400
0.1
0.1
20
0.4
225
70
90
95
Units
V
V
V
V
µA
µA
mA
µA
mA
mA
mA
www.fairchildsemi.com
2


Part Number 74645
Description Octal Bus Transceiver
Maker Fairchild Semiconductor
PDF Download

74645 Datasheet PDF






Similar Datasheet

1 7464 DIGITALLY CONTROLLED AUDIO PROCESSOR WITH SRS SURROUND SOUND AND VOICE CANCELLER
STMicroelectronics
2 74640 Inverting Octal TRI-STATE Transceiver
National Semiconductor
3 74643 True-Inverting Octal TRI-STATE Transceiver
National Semiconductor
4 74645 Octal Bus Transceiver
Fairchild Semiconductor





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