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CD74HC646M96 Datasheet(Hoja de datos) 2 Page - Texas Instruments

No. de Pieza. CD74HC646M96
Descripción  High-Speed CMOS Logic Octal Bus Transceiver/Register, Three-State
Descarga  14 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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 2 page
background image
2
Functional Diagram
20
19
18
17
15
13
14
16
4
B0
B1
B2
B3
B4
B5
B6
B7
OE
DIR
21
3
6
11
5
7
8
9
10
A0
A1
A2
A3
A4
A5
A6
A7
1
23
2
22
CAB CLOCK
CBA CLOCK
SAB SOURCE
SBA SOURCE
GND = PIN 12
VCC = PIN 24
B
DATA
PORT
A
DATA
PORT
FLIP-FLOP
CLOCKS
DATA
SOURCE
SELECTION
INPUTS
FUNCTION TABLE
INPUTS
DATA I/O (NOTE 1)
OPERATION OR FUNCTION
OE
DIR
CAB
CBA
SAB
SBA
A0 THRU A7
B0 THRU B7
XX
X
X
X
Input
Not Specified
Store A, B Unspecified
XXX
X
X
Not Specified
Input
Store B, A Unspecified
HX
↑↑
X
X
Input
Input
Store A and B Data
H
X
H or L
H or L
X
X
Isolation, Hold Storage
L
L
X
X
X
L
Output
Input
Real-Time B Data to A Bus
L
L
X
H or L
X
H
Stored B Data to A Bus
L
H
X
X
L
X
Input
Output
Real-Time A Data to B Bus
L
H
H or L
X
H
X
Stored A Data to B Bus
NOTE:
1. The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data inputs functions
are always enabled, i.e., data at the bus pins will be stored on every low-to-high transition on the clock inputs. To prevent
excess currents in the High-Z modes all I/O terminals should be terminated with 10k
Ω resistors.
CD74HC646
CD74HC646




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