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SN74AHC573DBRG4 데이터시트(PDF) 11 Page - Texas Instruments

부품명 SN74AHC573DBRG4
상세설명  Octal Transparent D-Type Latches With 3-State Outputs
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OE
To Seven Other Channels
LE
1D
C1
1D
1Q
SN54AHC573, SN74AHC573
www.ti.com
SCLS242L – OCTOBER 1995 – REVISED SEPTEMBER 2014
9 Detailed Description
9.1 Overview
The SNx4AHC573 devices are octal transparent D-type latches designed for 2-V to 5.5-V VCC operation.
When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is low, the Q outputs
are latched at the logic levels of the D inputs.
A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or
low) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines
significantly. The high-impedance state and increased drive provide the capability to drive bus lines without
interface or pull-up components.
OE does not affect the internal operations of the latches. Old data can be retained or new data can be entered
while 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 pull-up
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
9.2 Functional Block Diagram
9.3 Feature Description
Wide operating voltage range
Operates from 2 V to 5.5 V
Allows down voltage translation
Inputs accept voltages to 5.5 V
Slow edges reduce output ringing
9.4 Device Functional Modes
Table 1. Function Table
(Each Latch)
INPUTS
OUTPUT
Q
OE
LE
D
L
H
H
H
L
H
L
L
L
L
X
Q0
H
X
X
Z
Copyright © 1995–2014, Texas Instruments Incorporated
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Product Folder Links: SN54AHC573 SN74AHC573


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