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74F455 Folha de dados(PDF) 2 Page - NXP Semiconductors

Nome de Peças 74F455
Descrição Electrónicos  Buffers/drivers
Download  12 Pages
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Fabricante Electrônico  PHILIPS [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74F455 Folha de dados(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74F455,* 74F456
Buffers/Drivers
74F455 Octal Buffer/Driver with Parity, Inverting (3-State)
74F456 Octal Buffer/Driver with Parity, Non-Inverting (3-State)
2
1999 Jan 08
853–0371 20616
* Discontinued part. Please see the Discontinued Products List.
FEATURES
High impedance NPN base inputs for reduced loading
(40
µA in High and Low states)
74F456 combines 74F244 and 74F280A functions in one package
74F456 is a center pin version of the 74F656A
74F456 Non-Inverting
3-State outputs sink 64mA and source 15mA
24-pin plastic Slim DIP (300 mil) package
Broadside pinout simplifies PC board layout
DESCRIPTION
The 74F455 and 74F456 are octal buffers and line drivers with parity
generation/checking designed to be employed as memory address
drivers, clock drivers and bus-oriented transmitters/receivers. These
parts include parity generator/checker to improve PC board density.
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL SUPPLY CURRENT
(TOTAL)
74F455
6.5ns
64mA
74F456
7.5ns
64mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL
RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
PKG DWG #
24-pin plastic Slim
DIP (300mil)
N74456N
SOT222-1
24-pin plastic SOL
N74456D
SOT137-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
LOAD VALUE
HIGH/LOW
D0–D7
Data inputs
2.0/0.066
40
µA/40µA
PI
Parity input
1.0/0.033
20
µA/20µA
OE0, OE1
Output Enable inputs (active Low)
1.0/0.033
20
µA/20µA
ΣE, ΣO
Parity outputs
750/106.7
15mA/64mA
Q0–Q7
Data outputs (75F455)
750/106.7
15mA/64mA
Q0–Q7
Data outputs (75F456)
750/106.7
15mA/64mA
NOTE: One (1.0) FAST Unit Load (U.L.) is defined as 20
µA in the High state and 0.6mA in the Low state.
PIN CONFIGURATION – 74F455
24
23
22
21
20
19
18
17
16
15
14
13
12
10
11
9
8
7
6
5
4
3
2
1
OE0
OE1
PI
D0
D1
D2
D3
D4
D5
D6
D7
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
ΣE
ΣO
GND
GND
VCC
SF00969
PIN CONFIGURATION – 74F456
24
23
22
21
20
19
18
17
16
15
14
13
12
10
11
9
8
7
6
5
4
3
2
1
OE0
OE1
PI
D0
D1
D2
D3
D4
D5
D6
D7
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
ΣE
ΣO
GND
GND
VCC
SF00958


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