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| QUAD 2-INPUT MULTIPLEXER The LSTTL / MSI SN54L / 74LS158 is a high speed Quad 2-input Multiplexer. It selects four bits of data from two sources using the common Select and Enable inputs. The four buffered outputs present the selected data in the inverted form. The LS158 can also generate any four of the 16 different functions of two variables. The LS158 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families. SN54/74LS158 * * * * * * QUAD 2-INPUT MULTIPLEXER LOW POWER SCHOTTKY Schottky Process for High Speed Multifunction Capability Inverted Outputs Input Clamp Diodes Limit High Speed Termination Effects ESD > 3500 Volts Special Circuitry Ensures Glitch Free Multiplexing CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 E 15 I0c 14 I1c 13 Zc 12 I0d 11 I1d 10 Zd 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 16 J SUFFIX CERAMIC CASE 620-09 1 1 S 2 I0a 3 I1a 4 Za 5 I0b 6 I1b 7 Zb 8 GND LOADING (Note a) HIGH LOW 0.5 U.L. 0.5 U.L. 0.25 U.L. 0.25 U.L. 5 (2.5) U.L. 16 1 N SUFFIX PLASTIC CASE 648-08 PIN NAMES S E I0a - I0d I1a - I1d Za - Zd Common Select Input Enable (Active LOW) Input Data Inputs from Source 0 Data Inputs from Source 1 Inverted Outputs (Note b) 1.0 U.L. 1.0 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC NOTES: a) 1 TTL Unit Load (U.L.) = 40 A 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 I0a 2 3 I1a 5 I0b 6 I1b 14 I0c 13 I1c 11 I0d 10 I1d E S 15 1 LOGIC SYMBOL 15 2 3 5 6 14 13 11 10 E I0a I1a I0b I1b I0c I1c I0d I1d 1 S Za Zb Zc Zd 4 7 12 9 4 7 12 9 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS Zd VCC = PIN 16 GND = PIN 8 Za Zb Zc FAST AND LS TTL DATA 5-1 SN54/74LS158 FUNCTIONAL DESCRIPTION The LS158 is a Quad 2-input Multiplexer fabricated with the Schottky barrier diode process for high speed. It selects four bits of data from two sources under the control of a common Select Input (S) and presents the data in inverted form at the four outputs. The Enable Input (E) is active LOW. When E is HIGH, all of the outputs (Z) are forced HIGH regardless of all other inputs. The LS158 is the logic implementation of a 4-pole, 2-position switch where the position of the switch is deter- mined by the logic levels supplied to the Select Input. A common use of the LS158 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 LS158 can generate four functions of two variables with one variable common. This is useful for implementing gating functions. TRUTH TABLE ENABLE E H L L L L H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care SELECT INPUT S X L L H H INPUTS I0 X L H X X I1 X X X L H OUTPUT Z H H L H L 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 FAST AND LS TTL DATA 5-2 SN54/74LS158 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VIK VOH Parameter P 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 I0, I1 E, S I0, I1 E, S IIL IOS ICC Input LOW Current I0, I1 E, S Short Circuit Current (Note 1) Power Supply Current - 20 0.35 0.5 20 40 0.1 0.2 - 0.4 - 0.8 - 100 8.0 V A 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 V V V V Typ Max Unit Ui V V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH , , or VIL per Truth Table IOL = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V IIH mA mA mA VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX All inputs at 4.5 V. All outputs open. All other input combinations. All outputs open. ICC Power Supply Current 11 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 = 25C) Limits Symbol S bl tPLH tPHL tPLH tPHL tPLH tPHL Parameter P Propagation Delay Data to Output Propagation Delay Enable to Output Propagation Delay Select to Output Min Typ 7.0 10 11 18 13 16 Max 12 15 17 24 20 24 Unit Ui ns ns ns Figure 2 Figure 1 Figure 2 VCC = 5.0 V 50 CL = 15 pF Test C di i T Conditions AC WAVEFORMS VIN 1.3 V tPHL VOUT 1.3 V 1.3 V tPLH 1.3 V VOUT 1.3 V tPHL 1.3 V 1.3 V tPLH 1.3 V VIN Figure 1 Figure 2 FAST AND LS TTL DATA 5-3 |
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