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SN74AHC244PWE4 bảng dữ liệu(PDF) 9 Page - Texas Instruments

tên linh kiện SN74AHC244PWE4
Giải thích chi tiết về linh kiện  SNx4AHC244 Octal Buffers/Drivers With 3-State Outputs
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1
2
18
1Y1
1OE
1A1
4
16
1Y2
1A2
6
14
1Y3
1A3
8
12
1Y4
1A4
19
11
9
2Y1
2OE
2A1
13
7
2Y2
2A2
15
5
2Y3
2A3
17
3
2Y4
2A4
SN54AHC244, SN74AHC244
www.ti.com
SCLS226K – OCTOBER 1995 – REVISED JULY 2014
9 Detailed Description
9.1 Overview
The SNx4AHC244 devices are organized as two 4-bit buffers/line drivers with separate output-enable (OE)
inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs
are in the high-impedance state. To ensure the high-impedance state during power up or power down, OE
should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-
sinking capability of the driver.
9.2 Functional Block Diagram
Figure 4. Logic Diagram (Positive Logic)
9.3 Feature Description
VCC is optimized at 5 V
Allows down voltage translation
Inputs accept VIH levels of 5.5 V
Slow edge rates minimize output ringing
9.4 Device Functional Modes
Table 1. Function Table
(Each 4-Bit Buffer/Driver)
INPUTS
OUTPUT
Y
OE
A
L
H
H
L
L
L
H
X
Z
Copyright © 1995–2014, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Links: SN54AHC244 SN74AHC244


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