Transcript
SN54/74LS151 8-INPUT MULTIPLEXER The TTL / MSI SN54 / 74LS151 is a high speed 8-input Digital Multiplexer. It provides, in one package, the ability to select one bit of data from up to eight sources. The LS151 can be used as a universal function generator to generate any logic function of four variables. Both assertion and negation outputs are provided.
• • • • •
8-INPUT MULTIPLEXER
Schottky Process for High Speed Multifunction Capability On-Chip Select Logic Decoding Fully Buffered Complementary Outputs Input Clamp Diodes Limit High Speed Termination Effects
LOW POWER SCHOTTKY
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CONNECTION DIAGRAM DIP (TOP VIEW)
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D SUFFIX SOIC CASE 751B-03
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ORDERING INFORMATION
PIN NAMES S0 – S2 E I0 – I7 Z Z
SN54LSXXXJ SN74LSXXXN SN74LSXXXD
LOADING (Note a) Select Inputs Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output (Note b) Complementary Multiplexer Output (Note b)
HIGH
LOW
0.5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 10 U.L.
0.25 U.L. 0.25 U.L. 0.25 U.L. 5 (2.5) 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.
Ceramic Plastic SOIC
LOGIC SYMBOL
FAST AND LS TTL DATA 5-252
SN54/74LS151 LOGIC DIAGRAM
FUNCTIONAL DESCRIPTION The LS151 is a logical implementation of a single pole, 8-position switch with the switch position controlled by the state of three Select inputs, S0, S 1, S2. Both assertion and negation outputs are provided. The Enable input (E) is active LOW. When it is not activated, the negation output is HIGH and the assertion output is LOW regardless of all other inputs. The logic function provided at the output is:
Z = E ⋅ (I0 ⋅ S0 ⋅ S1 ⋅ S2 + ⋅ I1 ⋅ S0 ⋅ S1 ⋅ S2 + I2 ⋅ S0 ⋅ S1 ⋅ S2 + I3 ⋅ S0 ⋅ S1 ⋅ S2 + I4 ⋅ S0 ⋅ S1 ⋅ S2 + I5 ⋅ S0 ⋅ S1 ⋅ S2 + I6 ⋅ S0 ⋅ S1 ⋅ S2 + I7 ⋅ S0 ⋅ S1 ⋅ S2). The LS151 provides the ability, in one package, to select from eight sources of data or control information. By proper manipulation of the inputs, the LS151 can provide any logic function of four variables and its negation.
TRUTH TABLE E
S2
S1
S0
I0
I1
I2
I3
I4
I5
I6
I7
Z
Z
H L L L L L L L L L L L L L L L L
X L L L L L L L L H H H H H H H H
X L L L L H H H H L L L L H H H H
X L L H H L L H H L L H H L L H H
X L H X X X X X X X X X X X X X X
X X X L H X X X X X X X X X X X X
X X X X X L H X X X X X X X X X X
X X X X X X X L H X X X X X X X X
X X X X X X X X X L H X X X X X X
X X X X X X X X X X X L H X X X X
X X X X X X X X X X X X X L H X X
X X X X X X X X X X X X X X X L H
H H L H L H L H L H L H L H L H L
L L H L H L H L H L H L H L H L H
H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care
FAST AND LS TTL DATA 5-253
SN54/74LS151 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
TA
Operating Ambient Temperature Range
54 74
– 55 0
25 25
125 70
°C
IOH IOL
Output Current — High
54, 74
– 0.4
mA
Output Current — Low
54 74
4.0 8.0
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol
Parameter
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
VIK
Input Clamp Diode Voltage
VOH
Output HIGH Voltage
VOL
Output LOW Voltage
IIH
Input HIGH Current
IIL IOS
Input LOW Current
ICC
Power Supply Current
Min
Typ
Unit
Max
2.0 54
0.7
74
0.8 – 0.65
– 1.5
Test Conditions
V
Guaranteed Input HIGH Voltage for All Inputs
V
Guaranteed Input LOW Voltage for All Inputs
V
VCC = MIN, IIN = – 18 mA
54
2.5
3.5
V
74
2.7
3.5
V
VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table VCC = VCC MIN, VIN = VIL or VIH per Truth Table
54, 74
0.25
0.4
V
IOL = 4.0 mA
74
0.35
0.5
V
IOL = 8.0 mA
20
µA
VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V
Short Circuit Current (Note 1)
– 20
0.1
mA
– 0.4
mA
– 100
mA
VCC = MAX, VIN = 0.4 V VCC = MAX
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) Limits Typ
Max
Unit
tPLH tPHL
Symbol
Propagation Delay Select to Output Z
Parameter
27 18
43 30
ns
tPLH tPHL
Propagation Delay Select to Output Z
14 20
23 32
ns
tPLH tPHL
Propagation Delay Enable to Output Z
26 20
42 32
ns
tPLH tPHL
Propagation Delay Enable to Output Z
15 18
24 30
ns
tPLH tPHL
Propagation Delay Data to Output Z
20 16
32 26
ns
tPLH tPHL
Propagation Delay Data to Output Z
13 12
21 20
ns
Min
Test Conditions
VCC = 5.0 V CL = 15 pF
AC WAVEFORMS
Figure 1
Figure 2
FAST AND LS TTL DATA 5-254
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FAST AND LS TTL DATA 5-255
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FAST AND LS TTL DATA 5-256
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