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HC257 PDF даташит

Спецификация HC257 изготовлена ​​​​«System Logic Semiconductor» и имеет функцию, называемую «Quad 2-Input Data Selector/Multiplexer with 3-State Outputs».

Детали детали

Номер произв HC257
Описание Quad 2-Input Data Selector/Multiplexer with 3-State Outputs
Производители System Logic Semiconductor
логотип System Logic Semiconductor логотип 

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HC257 Даташит, Описание, Даташиты
SL74HC257
Quad 2-Input Data Selector/Multiplexer
with 3-State Outputs
High-Performance Silicon-Gate CMOS
The SL74HC257 is identical in pinout to the LS/ALS257. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
This device selects a (4-bit) nibble from either the A or B inputs as
determined by the Select input. The nibble is presented at the outputs
in noninverted from when the Output Enable pin is at a low level. A
high level on the Output Enable pin switches the outputs into the high-
impedance state.
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0 µA
High Noise Immunity Characteristic of CMOS Devices
LOGIC DIAGRAM
ORDERING INFORMATION
SL74HC257N Plastic
SL74HC257D SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
PIN 16 =VCC
PIN 8 = GND
SLS
System Logic
Semiconductor
FUNCTION TABLE
Inputs
Outputs
Output
Enable
Select
Y0-Y3
H XZ
L L A0-A3
L H B0-B3
X=don’t care
Z = high-impedance state
A0-A3,B0-B3=the levels of the respective
Nibble Inputs









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HC257 Даташит, Описание, Даташиты
SL74HC257
MAXIMUM RATINGS*
Symbol
VCC
VIN
VOUT
IIN
IOUT
ICC
PD
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
Value
-0.5 to +7.0
-1.5 to VCC +1.5
-0.5 to VCC +0.5
±20
±35
±75
750
500
Tstg Storage Temperature
TL Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
-65 to +150
260
*Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
Unit
V
V
V
mA
mA
mA
mW
°C
°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC
VIN, VOUT
TA
tr, tf
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Operating Temperature, All Package Types
Input Rise and Fall Time (Figure 1)
VCC =2.0 V
VCC =4.5 V
VCC =6.0 V
Min Max Unit
2.0 6.0
V
0 VCC
-55 +125
V
°C
0 1000 ns
0 500
0 400
This device contains protection circuitry to guard against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range
GND(VIN or VOUT)VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC).
Unused outputs must be left open.
SLS
System Logic
Semiconductor









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HC257 Даташит, Описание, Даташиты
SL74HC257
DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND)
Symbol
Parameter
Test Conditions
VIH Minimum High-Level VOUT=0.1 V or VCC-0.1 V
Input Voltage
IOUT≤ 20 µA
VIL Maximum Low -Level VOUT=0.1 V or VCC-0.1 V
Input Voltage
IOUT ≤ 20 µA
VOH Minimum High-Level VIN=VIH or VIL
Output Voltage
IOUT ≤ 20 µA
VIN=VIH or VIL
IOUT ≤ 6.0 mA
IOUT ≤ 7.8 mA
VOL Maximum Low-Level VIN=VIH or VIL
Output Voltage
IOUT ≤ 20 µA
VIN=VIH or VIL
IOUT ≤ 6.0 mA
IOUT ≤.7.8 mA
IIN Maximum Input
Leakage Current
VIN=VCC or GND
IOZ Maximum Three-State Output in High-Impedance
Leakage Current
State
VIN= VIL or VIH
VOUT= VCC or GND
ICC Maximum Quiescent VIN=VCC or GND
Supply Current
IOUT=0µA
(per Package)
VCC Guaranteed Limit
V 25 °C 85 125 Unit
to °C °C
-55°C
2.0 1.5 1.5 1.5
4.5 3.15 3.15 3.15
6.0 4.2 4.2 4.2
V
2.0 0.3
4.5 0.9
6.0 1.2
0.3 0.3
0.9 0.9
1.2 1.2
V
2.0 1.9
4.5 4.4
6.0 5.9
1.9 1.9
4.4 4.4
5.9 5.9
V
4.5 3.98 3.84 3.7
6.0 5.48 5.34 5.2
2.0 0.1
4.5 0.1
6.0 0.1
0.1 0.1
0.1 0.1
0.1 0.1
V
4.5 0.26 0.33 0.4
6.0 0.26 0.33 0.4
6.0 ±0.1 ±1.0 ±1.0 µA
6.0 ±0.5 ±5.0 ±10 µA
6.0 8.0
80 160 µA
SLS
System Logic
Semiconductor










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