INTEGRATED CIRCUITS
74LV251
8-input multiplexer (3-State)
Product specification
Supersedes data of 1997 Apr 10
IC24 Data Handbook
1998 May 20
Philips
Semiconductors
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74LV251
FEATURES
•
Optimized for low voltage applications: 1.0 to 3.6 V
•
Accepts TTL input levels between V
CC
= 2.7 V and V
CC
= 3.6 V
•
Typical V
OLP
(output ground bounce) < 0.8 V at V
CC
= 3.3 V,
•
Typical V
OHV
(output V
OH
undershoot) > 2 V at V
CC
= 3.3 V,
•
True and complement outputs
•
Both outputs are 3-State for further multiplexer expansion
•
Multifunction capability
•
Permits multiplexing from n-lines to one line
•
Output capability: standard
•
I
CC
category: MSI
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25°C; t
r
= t
f
≤
2.5 ns
SYMBOL
PARAMETER
Propagation delay
I
n
to Y
I
n
to Y
S
n
to Y
S
n
to Y
Input capacitance
Power dissipation capacitance per gate
T
amb
= 25°C
T
amb
= 25°C
DESCRIPTION
The 74LV251 is a low-voltage Si-gate CMOS device and is pin and
function compatible with 74HC/HCT251.
The 74LV251 is an 8-input multiplexer with 8 binary inputs (I
0
to I
7
), an
output enable input (OE) and three select inputs (S
0
, S
1
, S
2
). One of
the eight binary inputs is selected by the select inputs and is routed to
the outputs (Y, Y). Both outputs are in the high impedance OFF-state
(Z) when the output enable input is HIGH, allowing multiplexer
expansion by tying the outputs.
CONDITIONS
C
L
= 15 pF;
V
CC
= 3.3 V
TYPICAL
14
16
19
20
3.5
UNIT
t
PHL
/t
PLH
ns
C
I
C
PD
pF
pF
V
CC
= 3.3 V
V
I
= GND to V
CC1
44
NOTE:
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW)
P
D
= C
PD
×
V
CC2
×
f
i
)
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz; C
L
= output load capacitance in pF;
f
o
= output frequency in MHz; V
CC
= supply voltage in V;
(C
L
×
V
CC2
×
f
o
) = sum of the outputs.
ORDERING INFORMATION
PACKAGES
16-Pin Plastic DIL
16-Pin Plastic SO
16-Pin Plastic SSOP Type II
16-Pin Plastic TSSOP Type I
TEMPERATURE RANGE
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
OUTSIDE NORTH AMERICA
74LV251 N
74LV251 D
74LV251 DB
74LV251 PW
NORTH AMERICA
74LV251 N
74LV251 D
74LV251 DB
74LV251PW DH
PKG. DWG. #
SOT38-4
SOT109-1
SOT338-1
SOT403-1
1998 May 20
2
853–1967 19420
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74LV251
PIN CONFIGURATION
I
3
I
2
I
1
I
0
Y
Y
QE
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
I
4
I
5
I
6
I
7
S
0
S
1
S
2
PIN DESCRIPTION
PIN
NUMBER
4, 3, 2, 1, 15,
14, 13, 12
5
6
7
8
11, 10, 9
16
SV00629
SYMBOL
I
0
to I
7
Y
Y
OE
GND
S
0
to S
2
V
CC
FUNCTION
Multiplexer inputs
Multiplexer output
Complementary multiplexer output
3-State output enable input (active
LOW)
Ground (0 V)
Select inputs
Positive supply voltage
LOGIC SYMBOL
11
S0
4
3
2
1
15
14
13
12
I0
I1
I2
I3
I4
I5
I6
I7
OE
Y
6
10
S1
9
LOGIC SYMBOL (IEEE/IEC)
MUX
7
S2
11
10
9
4
Y
5
3
2
1
15
14
13
12
7
1
2
5
3
4
5
6
7
6
2
0
EN
0
G0
7
SV00630
SV00631
FUNCTIONAL DIAGRAM
4
3
2
1
15
14
13
12
I0
11
10
9
S0
S1
I1
I2
I3
I4
I5
I6
I7
MULTIPLEXER
S2
7
OE
Y
6
Y
5
SV00632
1998 May 20
3
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74LV251
FUNCTION TABLE
INPUTS
OE
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
S
2
X
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
S
1
X
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
S
0
X
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
I
0
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
I
1
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
X
X
I
2
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
X
X
I
3
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
X
X
I
4
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
X
X
I
5
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
X
X
I
6
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
X
X
I
7
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
H
OUTPUTS
Y
Z
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
Y
Z
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
NOTES:
H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
CC
V
I
V
O
T
amb
t
r
, t
f
PARAMETER
DC supply voltage
Input voltage
Output voltage
Operating ambient temperature range in free air
See DC and AC
characteristics
V
CC
= 1.0V to 2.0V
V
CC
= 2.0V to 2.7V
V
CC
= 2.7V to 3.6V
CONDITIONS
See Note 1
MIN
1.0
0
0
–40
–40
–
–
–
–
–
–
TYP
3.3
–
–
MAX
3.6
V
CC
V
CC
+85
+125
500
200
100
UNIT
V
V
V
°C
ns/V
Input rise and fall times
NOTE:
1. The LV is guaranteed to function down to V
CC
= 1.0V (input levels GND or V
CC
); DC characteristics are guaranteed from V
CC
= 1.2V to V
CC
= 5.5V.
1998 May 20
4
Philips Semiconductors
Product specification
8-input multiplexer (3-State)
74LV251
ABSOLUTE MAXIMUM RATINGS
1, 2
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0 V).
SYMBOL
V
CC
"I
IK
"I
OK
"I
O
"I
GND
,
"I
CC
T
stg
P
TOT
PARAMETER
DC supply voltage
DC input diode current
DC output diode current
DC output source or sink current
– standard outputs
DC V
CC
or GND current for types with
– standard outputs
Storage temperature range
Power dissipation per package
– plastic DIL
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)
for temperature range: –40 to +125°C
above +70°C derate linearly with 12 mW/K
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K
V
I
< –0.5 or V
I
> V
CC
+ 0.5V
V
O
< –0.5 or V
O
> V
CC
+ 0.5V
–0.5V < V
O
< V
CC
+ 0.5V
CONDITIONS
RATING
–0.5 to +4.6
20
50
25
UNIT
V
mA
mA
mA
50
–65 to +150
750
500
400
mA
°C
mW
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions. Voltages are referenced to GND (ground = 0 V).
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
V
CC
= 1.2 V
V
IH
HIGH level Input
voltage
V
CC
= 2.0 V
V
CC
= 2.7 to 3.6 V
V
CC
= 1.2 V
V
IL
LOW level Input
voltage
V
CC
= 2.0 V
V
CC
= 2.7 to 3.6 V
V
CC
= 1.2 V; V
I
= V
IH
or V
IL;
–I
O
= 100µA
V
O
OH
HIGH level output
voltage; all outputs
V
CC
= 2.0 V; V
I
= V
IH
or V
IL;
–I
O
= 100µA
V
CC
= 2.7 V; V
I
= V
IH
or V
IL;
–I
O
= 100µA
V
CC
= 3.0 V; V
I
= V
IH
or V
IL;
–I
O
= 100µA
V
OH
HIGH level output
voltage;
STANDARD
outputs
V
CC
= 3.0 V; V
I
= V
IH
or V
IL;
–I
O
= 6mA
V
CC
= 1.2 V; V
I
= V
IH
or V
IL;
I
O
= 100µA
V
O
OL
LOW level output
voltage; all outputs
V
CC
= 2.0 V; V
I
= V
IH
or V
IL;
I
O
= 100µA
V
CC
= 2.7 V; V
I
= V
IH
or V
IL;
I
O
= 100µA
V
CC
= 3.0 V; V
I
= V
IH
or V
IL;
I
O
= 100µA
V
OL
LOW level output
voltage;
STANDARD
outputs
V
CC
= 3.0 V; V
I
= V
IH
or V
IL;
I
O
= 6mA
1.8
2.5
2.8
1.2
2.0
2.7
3.0
1.8
2.5
2.8
V
0.9
1.4
2.0
0.3
0.6
0.8
-40°C to +85°C
TYP
1
MAX
-40°C to +125°C
MIN
0.9
1.4
2.0
0.3
0.6
0.8
V
V
MAX
UNIT
2.40
2.82
2.20
V
0
0
0
0
0.2
0.2
0.2
0.2
0.2
0.2
V
0.25
0.40
0.50
V
1998 May 20
5
编程基础
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
