Használati útmutató Texas Instruments SN74AS573AN

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SDAS048D − DECEMBER 1989 − REVISED JANUARY 1995

Copyright  1995, Texas Instruments Incorporated

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

•3-State Buer-Type Outputs Drive Bus

Lines Directly

•Bus-Structured Pinout

•True Logic Outputs

•Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), Standard Plastic (N) and

Ceramic (J) 300-mil DIPs, and Ceramic Flat

(W) Packages

description

These octal D-type transparent latches feature

3-state outputs designed specically 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.

While the latch-enable (LE) input is high, outputs

(Q) respond to the data (D) inputs. When LE is low,

the outputs are latched to retain the data that was

set up.

A buffered output-enable (OE) input can be used

to place the eight outputs in either a normal logic

state (high or low) or a high-impedance state. In

the high-impedance state, the outputs neither load

nor drive the bus lines signicantly. The

high-impedance state and the increased drive

provide the capability to drive bus lines without

interface or pullup components.

OE does not aect internal operation of the

latches. Old data can be retained or new data can

be entered while the outputs are in the

high-impedance state.

The SN54ALS573C and SN54AS573A are characterized for operation over the full military temperature range

of −55°°° °C to 125C. The SN74ALS573C and SN74AS573A are characterized for operation from 0C to 70C.

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

SN54ALS573C, SN54AS573A . . . J OR W PACKAGE

SN74ALS573C, SN74AS573A . . . DW OR N PACKAGE

(TOP VIEW)

32120 19

91011 1213

4

5

6

7

8

18

17

16

15

14

2Q

3Q

4Q

5Q

6Q

3D

4D

5D

6D

7D

SN54ALS573C, SN54AS573A . . . FK PACKAGE

(TOP VIEW)

2D

1D

OE

8Q

7Q 1Q

8D

G

ND

LE

V

CC

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