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.
LOW POWER SCHOTTKY• • • • •
Schottky Process for High Speed Multifunction Capability On-Chip Select Logic Decoding Fully Buffered Complementary Outputs Input Clamp Diodes Limit High Speed Termination Effects
J SUFFIX CERAMIC CASE 620-09
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 I4 15 I5 14 I6 13 I7 12 S0 11 S1 10 S2 9
N SUFFIX PLASTIC CASE 648-08
D SUFFIX SOIC CASE 751B-03
SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC
PIN NAMES S0 – S2 E I0 – I7 Z Z Select Inputs Enable (Active LOW) Input Multiplexer Inputs Multiplexer Output (Note b) Complementary Multiplexer Output (Note b)
LOADING (Note a) HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 10 U.L. LOW 0.25 U.L. 0.25 U.L. 0.25U.L. 5 (2.5) U.L. 5 (2.5) U.L.
7 4 3 2 1 15 14 13 12 E I0 I1 I2 I3 I4 I5 I6 I7 S0 S1 S2 Z Z 6 5
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.
11 10 9
VCC = PIN 16 GND = PIN 8
FAST AND LS TTL DATA 5-252
S2 S1 S0 E9 10 11 7
VCC = PIN 16 GND = PIN 8 = PIN NUMBERS
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 Enableinput (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 onepackage, 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.
E H L L L L L L L L L L L L L L L L S2 X L L L L L L L L H H H H H H H H S1 X L L L L H H H H L L L L H H H H S0 X L L H H L L H H L L H H L L H H I0 X L H X X X X X X X X X X X X X X I1 X X X L H X XX X X X X X X X X X I2 X X X X X L H X X X X X X X X X X I3 X X X X X X X L H X X X X X X X X I4 X X X X X X X X X L H X X X X X X I5 X X X X X X X X X X X L H X X X X I6 X X X X X X X X X X X X X L H X X I7 X X X X X X X X X X X X X X X L H Z H H L H L H L H L H L H L H L H L Z 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 DATA5-253
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current — High Output Current — Low Parameter 54 74 54 74 54, 74 54 74 Min 4.5 4.75 – 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 – 0.4 4.0 8.0 Unit V °C mA mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VILVIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 54 74 54, 74 VOL Output LOW Voltage 74 Input HIGH Current Input LOW Current Short Circuit Current (Note 1) Power Supply Current – 20 0.35 0.5 20 0.1 – 0.4 – 100 10 V µA mA mA mA mA 2.5 2.7 54 74 – 0.65 3.5 3.5 0.25 0.4 Min 2.0 0.7 0.8 – 1.5 Typ Max Unit V V V V V V Test Conditions Guaranteed...