Használati útmutató Texas Instruments SN74F573N
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SDFS011A − MARCH 1987 − REVISED OCTOBER 1993
Copyright 1993, Texas Instruments Incorporated
2−1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443
•Eight Latches in a Single Package
•3-State Bus-Driving True Outputs
•Full Parallel Access for Loading
•Buered Control Inputs
•Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
description
These 8-bit latches feature 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. They are
particularly suitable for implementing buffer
registers, I/O ports, bidirectional bus drivers, and
working registers.
The eight latches of the ′F573 are transparent
D-type latches. While the latch enable (LE) input
is high, the Q outputs follow the data (D) inputs.
When the latch enable is taken low, the Q outputs
are latched at the logic levels set up at 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 logic levels) or a high-
impedance state. In the high-impedance state, the
outputs neither load nor drive the bus lines
significantly. The high-impedancestate and
increased drive provide the capability to drive bus
lines without need for interface or pullup
components.
The output enable (OE) input does not aect 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.
The SN54F573 is characterized for operation over the full military temperature range of −55° °C to 125C. The
SN74F573 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each latch)
INPUTS
OUTPUT
OE LED
OUTPUT
Q
LH HH
L H LL
LL XQ0
H XXZ
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OE
1D
2D
3D
4D
5D
6D
7D
8D
GND
VCC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
LE
SN54F573. . . J PACKAGE
SN74F573. . . DW OR N PACKAGE
(TOP VIEW)
3 2 12019
910 11 1213
4
5
6
7
8
18
17
16
15
14
2Q
3Q
4Q
5Q
6Q
3D
4D
5D
6D
7D
2D
1D
OE
8Q
7Q 1Q
8D
G
ND
LE
V
CC
SN54F573. . . FK PACKAGE
(TOP VIEW)
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Termékspecifikációk
| Márka: | Texas Instruments |
| Kategória: | nincs kategorizálva |
| Modell: | SN74F573N |
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