INTEGRATED CIRCUITS
74LV251
8-input multiplexer (3-State)
Product specification |
1998 May 20 |
Supersedes data of 1997 Apr 10
IC24 Data Handbook
m n r
Philips Semiconductors |
Product specification |
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8-input multiplexer (3-State) |
74LV251 |
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FEATURES
•Optimized for low voltage applications: 1.0 to 3.6 V
•Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V
•Typical VOLP (output ground bounce) < 0.8 V at VCC = 3.3 V, Tamb = 25°C
•Typical VOHV (output VOH undershoot) > 2 V at VCC = 3.3 V, Tamb = 25°C
•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
•ICC category: MSI
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 (I0 to I7), an
output enable input (OE) and three select inputs (S0, S1, S2). 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.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25°C; tr = tf ≤ 2.5 ns
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PARAMETER |
CONDITIONS |
TYPICAL |
UNIT |
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Propagation delay |
CL = 15 pF; |
14 |
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In to Y |
VCC = 3.3 V |
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tPHL/tPLH |
In to |
Y |
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16 |
ns |
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Sn to Y |
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19 |
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Sn to |
Y |
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20 |
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CI |
Input capacitance |
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3.5 |
pF |
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CPD |
Power dissipation capacitance per gate |
VCC = 3.3 V |
44 |
pF |
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VI = GND to VCC1 |
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NOTE:
1.CPD is used to determine the dynamic power dissipation (PD in mW) PD = CPD × VCC2 × fi (CL × VCC2 × fo) where:
fi = input frequency in MHz; CL = output load capacitance in pF;
fo = output frequency in MHz; VCC = supply voltage in V;
(CL × VCC2 × fo) = sum of the outputs.
ORDERING INFORMATION
PACKAGES |
TEMPERATURE RANGE |
OUTSIDE NORTH AMERICA |
NORTH AMERICA |
PKG. DWG. # |
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16-Pin Plastic DIL |
±40°C to +125°C |
74LV251 N |
74LV251 N |
SOT38-4 |
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16-Pin Plastic SO |
±40°C to +125°C |
74LV251 D |
74LV251 D |
SOT109-1 |
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16-Pin Plastic SSOP Type II |
±40°C to +125°C |
74LV251 DB |
74LV251 DB |
SOT338-1 |
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16-Pin Plastic TSSOP Type I |
±40°C to +125°C |
74LV251 PW |
74LV251PW DH |
SOT403-1 |
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1998 May 20 |
2 |
853±1967 19420 |
Philips Semiconductors |
Product specification |
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8-input multiplexer (3-State) |
74LV251 |
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PIN CONFIGURATION
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VCC |
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I3 |
1 |
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16 |
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I2 |
2 |
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15 |
I4 |
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I1 |
3 |
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14 |
I5 |
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I0 |
4 |
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13 |
I6 |
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Y |
5 |
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12 |
I7 |
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6 |
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11 |
S0 |
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Y |
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QE |
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7 |
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10 |
S1 |
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GND |
8 |
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9 |
S2 |
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SV00629 |
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PIN DESCRIPTION
PIN |
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SYMBOL |
FUNCTION |
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NUMBER |
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4, 3, 2, 1, 15, |
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I0 to I7 |
Multiplexer inputs |
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14, 13, 12 |
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5 |
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Y |
Multiplexer output |
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6 |
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Complementary multiplexer output |
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Y |
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3-State output enable input (active |
7 |
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OE |
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LOW) |
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8 |
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GND |
Ground (0 V) |
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11, 10, 9 |
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S0 to S2 |
Select inputs |
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16 |
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VCC |
Positive supply voltage |
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LOGIC SYMBOL |
LOGIC SYMBOL (IEEE/IEC) |
11 10 9
S0 S1 S2
4 I0
3 I1
2 |
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I2 |
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Y |
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5 |
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1 |
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I3 |
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15 |
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I4 |
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Y |
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14 |
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I5 |
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13 |
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I6 |
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12 |
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I7 |
OE |
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7 |
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SV00630 |
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MUX
7 EN
11 0
10G 0 7
9 2
4 0
3 1
2 |
2 |
5 |
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1 |
3 |
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15 |
4 |
6 |
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14 |
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13 6
12 7
SV00631
FUNCTIONAL DIAGRAM
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4 |
3 |
2 |
1 |
15 |
14 |
13 |
12 |
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I0 |
I1 |
I2 |
I3 |
I4 |
I5 |
I6 |
I7 |
11 |
S 0 |
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10 |
S 1 |
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MULTIPLEXER |
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9 |
S 2 |
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7 |
OE |
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Y |
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Y |
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6 |
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5 |
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SV00632 |
1998 May 20 |
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3 |
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Philips Semiconductors |
Product specification |
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8-input multiplexer (3-State) |
74LV251 |
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FUNCTION TABLE
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INPUTS |
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OUTPUTS |
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S2 |
S1 |
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S0 |
I0 |
I1 |
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I2 |
I3 |
I4 |
I5 |
I6 |
I7 |
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Y |
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OE |
Y |
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H |
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X |
X |
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X |
X |
X |
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X |
X |
X |
X |
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Z |
Z |
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L |
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X |
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H |
L |
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NOTES: |
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H |
= |
HIGH voltage level |
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L |
= |
LOW voltage level |
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X |
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don't care |
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Z |
= |
high impedance OFF-state |
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RECOMMENDED OPERATING CONDITIONS
SYMBOL |
PARAMETER |
CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
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VCC |
DC supply voltage |
See Note 1 |
1.0 |
3.3 |
3.6 |
V |
VI |
Input voltage |
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0 |
± |
VCC |
V |
VO |
Output voltage |
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0 |
± |
VCC |
V |
Tamb |
Operating ambient temperature range in free air |
See DC and AC |
±40 |
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+85 |
°C |
characteristics |
±40 |
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+125 |
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VCC = 1.0V to 2.0V |
± |
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500 |
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tr, tf |
Input rise and fall times |
VCC = 2.0V to 2.7V |
± |
± |
200 |
ns/V |
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VCC = 2.7V to 3.6V |
± |
± |
100 |
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NOTE:
1. The LV is guaranteed to function down to VCC = 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.
1998 May 20 |
4 |
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