SN74AHC573-Q1
www. ti. com. SCLS697A – DECEMBER 2005 – REVISED APRIL 2008
OCTAL TRANSPARENT D-TYPE LATCH WITH 3-STATE OUTPUTS
FEATURES
1
• Qualified for Automotive Applications • Operating Range 2-V to 5. 5-V VCC • 3-State Outputs Directly Drive Bus Lines
PW PACKAGE (TOP VIEW)
OE 1 1D 2 2D 3 3D 4 4D 5 5D 6 6D 7 7D 8 8D 9 GND 10
20 VCC 19 1Q 18 2Q 17 3Q 16 4Q 15 5Q 14 6Q 13 7Q 12 8Q 11 LE
DESCRIPTION
The SN74AHC573 is an octal transparent D-type latch 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 pullup 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 pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
TA –40°C to 125°C
ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART NUMBER
TSSOP – PW
Reel of 2000
SN74AHC573QPWRQ1
TOP-SIDE MARKING HA573Q
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www. ti. com.
(2) Package drawings, thermal data, and symbolization are available at www. ti. com/packaging.
FUNCTION TABLE (EACH LATCH)
INPUTS
OE
LE
...
SN74AHC573-Q1 PDF File
