5-505
FAST AND LS TTL DATA
DUAL 4-INPUT MULTIPLEXER
The SN54 /74LS352 is a very high-speed Dual 4-input Multiplexer with
Common Select inputs and individual Enable inputs for each section. It can
select two bits of data from four sources. The two buffered outputs present
data in the inverted (complementary) form. The SN54/74LS352 is the func-
tional equivalent of the SN54/74LS153 except with inverted outputs.
•Inverted Version of the SN54/74LS153
•Separate Enables for Each Multiplexer
•Input Clamp Diode Limit High Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
PIN NAMES LOADING (Note a)
HIGH LOW
S0, S1Common Select Inputs 0.5 U.L. 0.25 U.L.
E Enable (Active LOW) Input 0.5 U.L. 0.25 U.L.
I0–I1Multiplexer Inputs 0.5 U.L. 0.25 U.L.
Z Multiplexer Outputs (note b) 10 U.L. 5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial
(74) Temperature Ranges.
LOGIC DIAGRAM
SN54/74LS352
DUAL 4-INPUT MULTIPLEXER
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16 1
16
1
16 1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
5-506
FAST AND LS TTL DATA
SN54/74LS352
FUNCTIONAL DESCRIPTION
The SN54/74LS352 is a Dual 4-Input Multiplexer . It selects
two bits of data from up to four sources under the control of the
common Select Inputs (S0, S1). The two 4-input multiplexer
circuits have individual active LOW Enables (Ea, Eb) which
can be used to strobe the outputs independently. When the
Enables (Ea, Eb) are HIGH, the corresponding outputs (Za, Zb)
are forced HIGH.
The logic equations for the outputs are shown below.
Za = Ea • (I0a • S1 • S0 + I1a • S1 • S0 + I2a • S1 • S0 + I3a • S1 • S0)
Zb = Eb • (I0b • S1 • S0 + I1b • S1 • S0 + I2b • S1 • S0 + I3b • S1 • S0)
The SN54/74LS352 can be used to move data from a group
of registers to a common output bus. The particular register
from which the data came would be determined by the state of
the Select Inputs. A less obvious application is a function gen-
erator. The SN54/74LS352 can generate two functions of
three variables. This is useful for implementing highly irregular
random logic.
TRUTH TABLE
SELECT INPUTS INPUTS (a or b) OUTPUT
S0S1E I0I1I2I3Z
X X H X X X X H
L L L L X X X H
L L L H X X X L
H L L X L X X H
H L L X H X X L
L H L X X L X H
L H L X X H X L
H H L X X X L H
H H L X X X H L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High 54, 74 –0.4 mA
IOL Output Current — Low 54
74 4.0
8.0 mA
5-507
FAST AND LS TTL DATA
SN54/74LS352
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54 0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
Input LOW Voltage
74 0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
54 2.5 3.5 V
V
CC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
Output HIGH Voltage
74 2.7 3.5 V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Output LOW Voltage
54, 74 0.25 0.4 V IOL = 4.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
Output LOW Voltage
74 0.35 0.5 V IOL = 8.0 mA
VIN = VIL or VIH
per Truth Table
IIH
Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
IOS Short Circuit Current (Note 1) –20 –100 mA VCC = MAX
ICC Power Supply Current 10 mA VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPLH
tPHL Propagation Delay,
Select to Output 19
25 29
38 ns Figure 1 or 2
VCC = 5.0 V,
CL = 15 pF
tPLH
tPHL Propagation Delay,
Enable to Output 16
21 24
32 ns Figure 2
VCC = 5.0 V,
CL = 15 pF
tPLH
tPHL Propagation Delay,
Data to Output 13
17 20
26 ns Figure 1
Figure 1 Figure 2
AC WAVEFORMS
5-508
FAST AND LS TTL DATA
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5-509
FAST AND LS TTL DATA
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