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HC257のメーカーはSystem Logic Semiconductorです、この部品の機能は「Quad 2-Input Data Selector/Multiplexer with 3-State Outputs」です。 |
部品番号 | HC257 |
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部品説明 | Quad 2-Input Data Selector/Multiplexer with 3-State Outputs | ||
メーカ | System Logic Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとHC257ダウンロード(pdfファイル)リンクがあります。 Total 5 pages
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
1 Page 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
3Pages | |||
ページ | 合計 : 5 ページ | ||
|
PDF ダウンロード | [ HC257 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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