SN54HC244_16 Datasheet, PDF (11/32 Pages) Texas Instruments – Octal Buffers and Line Drivers With 3-State Outputs

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8 Detailed Description
SN54HC244, SN74HC244
SCLS130E – DECEMBER 1982 – REVISED MAY 2016
8.1 Overview
The SNx4HC244 device is organized as two 4-bit buffers and 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 V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-
sinking capability of the driver.
8.2 Functional Block Diagram
1OE ¹
2OE ¹⁹
2
1A1
18 _1Y1
11
2A1
9 _1Y1
4
1A2
16 _1Y1
13
2A2
7 _1Y1
6
1A3
14 _1Y1
15
2A3
5 _1Y1
8
1A4
12 _1Y4
17
2A4
3 _1Y4
Copyright © 2016, Texas Instruments Incorporated
8.3 Feature Description
The SNx4HC244 has a wide operating voltage of 2 V to 6 V. Inputs accept voltage levels up to V_CC. This device
has a low power consumption of I_CC 80 µA (maximum). The SNx4HC244 device can drive ±6 mA at V_CC of 5 V.
8.4 Device Functional Modes
Table 2 lists the functions of the SNx4HC244.
Table 2. Function Table
(Each Buffer or Driver)
INPUTS
OE
A
L
H
L
L
H
X
OUTPUT
Y
H
L
Z
Copyright © 1982–2016, Texas Instruments Incorporated
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