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74F257ASC PDF даташит

Спецификация 74F257ASC изготовлена ​​​​«Fairchild» и имеет функцию, называемую «Quad 2-Input Multiplexer with 3-STATE Outputs».

Детали детали

Номер произв 74F257ASC
Описание Quad 2-Input Multiplexer with 3-STATE Outputs
Производители Fairchild
логотип Fairchild логотип 

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74F257ASC Даташит, Описание, Даташиты
April 1988
Revised August 1999
74F257A
Quad 2-Input Multiplexer with 3-STATE Outputs
General Description
The 74F257A is a quad 2-input multiplexer with 3-STATE
outputs. Four bits of data from two sources can be selected
using a Common Data Select input. The four outputs
present the selected data in true (non-inverted) form. The
outputs may be switched to a high impedance state with a
HIGH on the common Output Enable (OE) input, allowing
the outputs to interface directly with bus-oriented systems.
Features
s Multiplexer expansion by tying outputs together
s Non-inverting 3-STATE outputs
s Input clamp diodes limit high-speed termination effects
Ordering Code:
Order Number Package Number
Package Description
74F257ASC
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
74F257ASJ
M16D
16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
74F257APC
N16E
16-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.
Logic Symbols
Connection Diagram
IEEE/IEC
© 1999 Fairchild Semiconductor Corporation DS009507
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74F257ASC Даташит, Описание, Даташиты
Unit Loading/Fan Out
Pin Names
S
OE
I0a–I0d
I1a–I1d
Za–Zd
Description
Common Data Select Input
3-STATE Output Enable Input (Active LOW)
Data Inputs from Source 0
Data Inputs from Source 1
3-STATE Multiplexer Outputs
U.L.
HIGH/LOW
1.0/1.0
1.0/1.0
1.0/1.0
1.0/1.0
150/40 (33.3)
Input IIH/IIL
Output IOH/IOL
20 µA/0.6 mA
20 µA/0.6 mA
20 µA/0.6 mA
20 µA/0.6 mA
3 mA/24 mA (20 mA)
Truth Table
Output
Enable
Select
Input
OE S
HX
LH
LH
LL
LL
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Data
Inputs
I0 I1
XX
XL
XH
LX
HX
Output
Z
Z
L
H
L
H
Functional Description
The 74F257A is a quad 2-input multiplexer with 3-STATE
outputs. It selects four bits of data from two sources under
control of a Common Data Select input. When the Select
input is LOW, the I0x inputs are selected and when Select
is HIGH, the I1x inputs are selected. The data on the
selected inputs appears at the outputs in true (non-
inverted) form. The device is the logic implementation of a
4-pole, 2-position switch where the position of the switch is
determined by the logic levels supplied to the Select input.
The logic equation for the outputs is shown below:
Zn = OE • (In• S + Ion • S)
When the Output Enable input (OE) is HIGH, the outputs
are forced to a high impedance OFF state. If the outputs
are tied together, all but one device must be in the high
impedance state to avoid high currents that would exceed
the maximum ratings. Designers should ensure the Output
Enable signals to 3-STATE devices whose outputs are tied
together are designed so there is no overlap.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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74F257ASC Даташит, Описание, Даташиты
Absolute Maximum Ratings(Note 1)
Storage Temperature
65°C to +150°C
Ambient Temperature under Bias
55°C to +125°C
Junction Temperature under Bias
55°C to +150°C
VCC Pin Potential to Ground Pin
Input Voltage (Note 2)
0.5V to +7.0V
0.5V to +7.0V
Input Current (Note 2)
30 mA to +5.0 mA
Voltage Applied to Output
in HIGH State (with VCC = 0V)
Standard Output
3-STATE Output
0.5V to VCC
0.5V to +5.5V
Current Applied to Output
in LOW State (Max)
twice the rated IOL (mA)
ESD Last Passing Voltage (Min)
4000V
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to +70°C
+4.5V to +5.5V
Note 1: Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2: Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Symbol
Parameter
VIH
VIL
VCD
VOH
VOL
IIH
IBVI
ICEX
VID
IOD
IIL
IOZH
IOZL
IOS
IZZ
ICCH
ICCL
ICCZ
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
Output LOW
Voltage
10% VCC
10% VCC
5% VCC
5% VCC
10% VCC
Input HIGH
Current
Input HIGH Current
Breakdown Test
Output HIGH
Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW Current
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Bus Drainage Test
Power Supply Current
Power Supply Current
Power Supply Current
Min
2.0
2.5
2.4
2.7
2.7
4.75
60
Typ
9.0
14.5
15
Max
0.8
1.2
0.5
5.0
7.0
50
3.75
0.6
50
50
150
500
15
22
23
Units
V
V
V
V
V
µA
µA
µA
V
µA
mA
µA
µA
mA
µA
mA
mA
mA
VCC Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
Min IIN = −18 mA
IOH = −1 mA
Min IOH = −3 mA
IOH = −1 mA
IOH = −3 mA
Min IOL = 24 mA
Max VIN = 2.7V
Max VIN = 7.0V
Max
0.0
0.0
Max
Max
Max
Max
0.0V
Max
Max
Max
VOUT = VCC
IID = 1.9 µA
All Other Pins Grounded
VIOD = 150 mV
All Other Pins Grounded
VIN = 0.5V
VOUT = 2.7V
VOUT = 0.5V
VOUT = 0V
VOUT = 5.25V
VO = HIGH
VO = LOW
VO = HIGH Z
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