74F251A Philips, 74F251A Datasheet

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74F251A

Manufacturer Part Number
74F251A
Description
8-input multiplexer 3-State
Manufacturer
Philips
Datasheet

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Philips Semiconductors
FEATURES
DESCRIPTION
The 74F251A is a logic implementation of a single 8-position switch
with the switch position controlled by the state of three Select (S0,
S1, S2) inputs. True (Y) and complementary (Y) outputs are both
provided. The output enable (OE) is active Low. When OE is High,
both outputs are in High impedance state, allowing multiple output
connections to a common bus without driving nor loading the bus
significantly. All but one device must be in High impedance state to
avoid high currents that would exceed the maximum ratings when
the outputs of the 3-State devices are tied together. When the output
of more than one device is tied together the user must ensure that
there is no overlap in the active Low portion of the output enable
voltages.
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
NOTE:
One (1.0) FAST unit load is defined as: 20 A in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
1996 Jan 05
High speed 8-to-1 multiplexing
On chip decoding
Multifunction capability
Inverting and Non-Inverting outputs
Both outputs are 3-State for further multiplexer expansion
V
GND = Pin 8
8-input multiplexer (3-State)
CC
= Pin 16
11
10
S0–S2
PINS
I0–I7
9
7
Y, Y
OE
S0
S1
S2
OE
4
I0
Data inputs
Select inputs
Output Enable input (active Low)
Data outputs
3
I1
2
I2
Y
5
I3
1
Y
6
15
I4
DESCRIPTION
14
I5
13
I6
12
I7
SF00779
1
PIN CONFIGURATION
ORDERING INFORMATION
IEC/IEEE SYMBOL
74F251A
16-pin plastic DIP
16-pin plastic SO
TYPE
DESCRIPTION
DESCRIPTION
74F (U.L.) HIGH/LOW
1.0/1.0
1.0/1.0
1.0/1.0
150/40
7
11
10
9
4
3
2
1
15
14
13
12
PROPAGATION
TYPICAL
GND
DELAY
OE
4.5ns
I3
I2
I1
I0
Y
Y
EN
0
2
1
2
3
4
5
6
7
8
COMMERCIAL RANGE
T
amb
V
G
ORDER CODE
CC
MUX
0
7
N74F251AN
N74F251AD
= 0 C to +70 C
= 5V 10%,
LOAD VALUE HIGH/LOW
SUPPLY CURRENT
13
10
16
15
14
12
11
9
20 A/0.6mA
20 A/0.6mA
20 A/0.6mA
3mA/24mA
Product specification
V
I4
I5
I6
I7
S0
S1
S2
CC
TYPICAL
(TOTAL)
74F251A
853–0358 16191
19mA
5
6
SOT162-1
SOT38-4
DWG #
SF00778
PKG
PKG
SF00780

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74F251A Summary of contents

Page 1

... Inverting and Non-Inverting outputs Both outputs are 3-State for further multiplexer expansion DESCRIPTION The 74F251A is a logic implementation of a single 8-position switch with the switch position controlled by the state of three Select (S0, S1, S2) inputs. True (Y) and complementary (Y) outputs are both provided. The output enable (OE) is active Low. When OE is High, ...

Page 2

... H = High voltage level L = Low voltage level X = Don’t care Z = High impedance “off” state 1996 Jan OUTPUTS Product specification 74F251A SF00781 ...

Page 3

... MAX 2. MAX 0. MAX MAX MAX the use of high-speed test apparatus and/or sample-and-hold OS 3 Product specification 74F251A RATING UNIT –0.5 to +7.0 V –0.5 to +7.0 V – –0 +70 C –65 to +150 C LIMITS UNIT UNIT NOM MAX 5 ...

Page 4

... M V OUT SF00782 Waveform 2. For Non-Inverting Outputs OE V –0. SF00784 Waveform 4. 3-State Output Enable Time to Low Level and Output Disable Time from Low Level 4 Product specification 74F251A LIMITS V = +5V 10 +70 C amb UNIT UNIT C = 50pF 500 ...

Page 5

... NEGATIVE PULSE 10% t THL ( TLH ( 90% POSITIVE V PULSE M 10% Input Pulse Definition INPUT PULSE REQUIREMENTS family V amplitude M of OUT 74F 3.0V 1.5V 5 Product specification 74F251A t AMP ( TLH ( THL ( f AMP ( rep. rate ...

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