74LVQ157SC

© 2001 Fairchild Semiconductor Corporation DS011352 www.fairchildsemi.com
February 1992
Revised June 2001
74LVQ157 Low Voltage Quad 2-Input Multiplexer
74LVQ157
Low Voltage Quad 2-Input Multiplexer
General Description
The LVQ157 is a high-speed quad 2-input multiplexer. Four
bits of data from two sources can be selected using the
common Select and Enable inputs. The four outputs
present the selected data in the true (non inverted) form.
The LVQ157 can also be used as a function generator.
Features
Ideal for low power/low noise 3.3V applications
Guaranteed simultaneous switching noise level and
dynamic threshold performance
Guaranteed pin-to-pin skew AC performance
Guaranteed incident wave switching into 75
.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
IEEE/IEC
Connection Diagram
Pin Descriptions
Order Number Package Number Package Description
74LVQ157SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow
74LVQ157SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Pin Names Description
I
0a
I
0d
Source 0 Data Inputs
I
1a
I
1d
Source 1 Data Inputs
E
Enable Input
S Select Input
Z
a
Z
d
Outputs
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74LVQ157
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Functional Description
The LVQ157 is a quad 2-input multiplexer. It selects four
bits of data from two sources under the control of a com-
mon Select input (S). The Enable input (E
) is active-LOW.
When E
is HIGH, all of the outputs (Z) are forced LOW
regardless of all other inputs. The LVQ157 is the logic
implementation of a 4-pole, 2-position switch where the
position of the switch is determined by the logic levels sup-
plied to the Select input. The logic equations for the outputs
are shown below:
Z
a
= E (I
1a
S + I
0a
S)
Z
b
= E (I
1b
S + I
0b
S)
Z
c
= E (I
1c
S + I
0c
S)
Z
d
= E (I
1d
S + I
0d
S)
A common use of the LVQ157 is the moving of data from
two groups of registers to four common output busses. The
particular register from which the data comes is determined
by the state of the Select input. A less obvious use is as a
function generator. The LVQ157 can generate any four of
the sixteen different functions of two variables with one
variable common. This is useful for implementing gating
functions.
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Inputs Outputs
E
SI
0
I
1
Z
HX X X L
LH X L L
LH X H H
LL L X L
LL H X H
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74LVQ157
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 2)
Note 1: The Absolute Maximum Ratings are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The Recommended Operating Conditions table will define the conditions
for actual device operation.
Note 2: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Note 3: All outputs loaded; thresholds on input associated with output under test.
Note 4: Maximum test duration 2.0 ms, one output loaded at a time.
Note 5: Incident wave switching on transmission lines with impedances as low as 75 for commercial temperature range is guaranteed for.
Note 6: Worst case package.
Note 7: Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V; one output at GND.
Note 8: Max number of Data Inputs (n) switching. (n 1) inputs switching 0V to 3.3V. Input-under-test switching: 3.3V to threshold (V
ILD
), 0V to threshold
(V
IHD
), f = 1 MHz.
Supply Voltage (V
CC
) 0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
= 0.5V 20 mA
V
I
= V
CC
+ 0.5V +20 mA
DC Input Voltage (V
I
) 0.5V to V
CC
+ 0.5V
DC Output Diode Current (I
OK
)
V
O
= 0.5V 20 mA
V
O
= V
CC
+ 0.5V +20 mA
DC Output Voltage (V
O
) 0.5V to V
CC
+ 0.5V
DC Output Source
or Sink Current (I
O
) ±50 mA
DC V
CC
or Ground Current
(I
CC
or I
GND
) ±200 mA
Storage Temperature (T
STG
) 65°C to +150°C
DC Latch-Up Source or
Sink Current ±100 mA
Supply Voltage (V
CC
) 2.0V to 3.6V
Input Voltage (V
I
)0V to V
CC
Output Voltage (V
O
)0V to V
CC
Operating Temperature (T
A
) 40°C to +85°C
Minimum Input Edge Rate (
V/t)
V
IN
from 0.8V to 2.0V
V
CC
@ 3.0V 125 mV/ns
Symbol Parameter
V
CC
T
A
= +25°CT
A
= 40°C to +85°C
Units Conditions
(V) Typ Guaranteed Limits
V
IH
Minimum High Level
3.0 1.5 2.0 2.0 V
V
OUT
= 0.1V
Input Voltage or V
CC
0.1V
V
IL
Maximum Low Level
3.0 1.5 0.8 0.8 V
V
OUT
= 0.1V
Input Voltage or V
CC
0.1V
V
OH
Minimum High Level 3.0 2.99 2.9 2.9 V I
OUT
= 50 µA
Output Voltage
3.0 2.58 2.48 V
V
IN
= V
IL
or V
IH
(Note 3)
I
OH
= 12 mA
V
OL
Maximum Low Level 3.0 0.002 0.1 0.1 V I
OUT
= 50 µA
Output Voltage
3.0 0.36 0.44 V
V
IN
= V
IL
or V
IH
(Note 3)
I
OL
= 12 mA
I
IN
Maximum Input
3.6 ±0.1 ±1.0 µA
V
I
= V
CC
,
Leakage Current GND
I
OLD
Minimum Dynamic 3.6 36 mA V
OLD
= 0.8V Max (Note 5)
I
OHD
Output Current (Note 4) 3.6 25 mA V
OHD
= 2.0V Min (Note 5)
I
CC
Maximum Quiescent
3.6 4.0 40.0 µA
V
IN
= V
CC
Supply Current or GND
V
OLP
Quiet Output
3.3 0.7 0.8 V (Note 6)(Note 7)
Maximum Dynamic V
OL
V
OLV
Quiet Output
3.3 0.4 0.8 V (Note 6)(Note 7)
Minimum Dynamic V
OL
V
IHD
Maximum High Level
3.3 1.7 2.0 V (Note 6)(Note 8)
Dynamic Input Voltage
V
ILD
Maximum Low Level
3.3 1.6 0.8 V (Note 6)(Note 8)
Dynamic Input Voltage

74LVQ157SC

Mfr. #:
Manufacturer:
ON Semiconductor / Fairchild
Description:
Encoders, Decoders, Multiplexers & Demultiplexers Quad 2-Input Multi
Lifecycle:
New from this manufacturer.
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