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| SN54/74LS251 8-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The TTL/MSI SN74LS251 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 LS251 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 WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY * * * * * Schottky Process for High Speed Multifunction Capability On-Chip Select Logic Decoding Inverting and Non-Inverting 3-State Outputs Input Clamp Diodes Limit High Speed Termination Effects CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 I4 15 I5 14 I6 13 I7 12 S0 11 S1 10 S2 9 16 J SUFFIX CERAMIC CASE 620-09 1 16 1 N SUFFIX PLASTIC CASE 648-08 1 I3 2 I2 3 I1 4 I0 5 Z 6 Z 7 E0 8 GND PIN NAMES S0-S2 E0 I0-I7 Z Z Select Inputs Output Enable (Active LOW) Inputs Multiplexer Inputs Multiplexer Output Complementary Multiplexer Output LOADING (Note a) HIGH 0.5 U.L. 0.5 U.L. 0.5 U.L. 65 U.L. 65 U.L. LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 15 U.L. 15 U.L. 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC I4 I5 15 14 NOTES: a. 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW. LOGIC DIAGRAM S2 S1 S0 E1 9 10 11 7 I0 4 I1 3 I2 2 I3 1 I6 13 I7 12 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS Z 5 6 Z FAST AND LS TTL DATA 5-410 SN54/74LS251 FUNCTIONAL DESCRIPTION The LS251 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 Output Enable input (EO) is active LOW. When it is activated, the logic function provided at the output is: Z = EO (I0 S0 S1 S2 + I1 S0 S1 S2 + I2 S0 S1 Z = EO S2 + I3 S0 S1 S2 + I4 S0 S1 S2 + I5 S0 Z = EO S1 S2 + I6 S0 S1 S2 + I7 S0 S1 S2). When the Output Enable is HIGH, both outputs are in the high impedance (high Z) state. This feature allows multiplexer expansion by tying the outputs of up to 128 devices together. When the outputs of the 3-state devices are tied together, all but one device must be in the high impedance state to avoid high currents that would exceed the maximum ratings. The Output Enable signals should be designed to ensure there is no overlap in the active LOW portion of the enable voltage. TRUTH TABLE E0 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 X X 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 (Z) H L H L H L H L H L H L H L H L Z (Z) 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 (Z) = High impedance (Off) GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter Min 4.75 0 Typ 5.0 25 Max 5.25 70 - 2.6 24 Unit V C mA mA FAST AND LS TTL DATA 5-411 SN54/74LS251 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol VIH VIL VIK VOH Parameter Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 2.4 - 0.65 3.1 0.25 VOL IOZH IOZL IIH IIL IOS ICC Output LOW Voltage 0.35 Output Off Current HIGH Output Off Current LOW Input HIGH Current 0.1 Input LOW Current Short Circuit Current (Note 1) Power Supply Current 12 mA - 30 - 0.4 - 130 10 0.5 20 - 20 20 V A A A mA mA mA mA 0.4 Min 2.0 0.8 - 1.5 Typ Max Unit V V V V V Test Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 12 mA IOL = 24 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VOUT = 2.7 V VCC = MAX, VOUT = 0.4 V VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX, VE = 0 V VCC = MAX, VE = 4.5 V Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25C, VCC = 5.0 V) Limits Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPZH tPZL tPHZ tPLZ tPHZ tPLZ Parameter Propagation Delay, Select to Z Output Propagation Delay, Select to Z Output Propagation Delay, Data to Z Output Propagation Delay, Data to Z Output Output Enable Time to Z Output Output Enable Time to Z Output Output Disable Time to Z Output Output Disable Time to Z Output Min Typ 20 21 29 28 10 9.0 17 18 17 24 30 26 37 15 30 15 Max 33 33 45 45 15 15 28 28 27 40 45 40 55 25 45 25 Unit ns ns ns ns ns ns ns ns Figure 1 Figure 2 Figure 1 Figures 2 Figures 4, 5 Figures 3, 5 Figures 3, 5 Figures 4, 5 Test Conditions CL = 15 pF, RL = 2.0 k CL = 5.0 pF, RL = 667 k FAST AND LS TTL DATA 5-412 SN54/74LS251 3-STATE AC WAVEFORMS VIN 1.3 V tPLH 1.3 V tPHL 1.3 V VIN 1.3 V tPHL 1.3 V tPLH 1.3 V VOUT 1.3 V VOUT 1.3 V Figure 1 Figure 2 VE 1.3 V tPZL 1.3 V tPLZ 1.3 V VE tPZH VOUT 1.3 V tPHZ 1.3 V 1.3 V VOUT 1.3 V VOL 0.5 V VOH 1.3 V 0.5 V Figure 3 0.5 V Figure 4 AC LOAD CIRCUIT VCC SWITCH POSITIONS RL SYMBOL tPZH SW1 Open Closed Closed Closed SW2 Closed Open Closed Closed SW1 tPZL tPLZ TO OUTPUT UNDER TEST tPHZ 5 k CL* SW2 * Includes Jig and Probe Capacitance. Figure 5 FAST AND LS TTL DATA 5-413 -A- Case 751B-03 D Suffix 16-Pin Plastic SO-16 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. 3. CONTROLLING DIMENSION: MILLIMETER. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. 751B 01 IS OBSOLETE, NEW STANDARD 751B 03. 16 9 -B1 8 P 8 PL 0.25 (0.010) M B M R X 45 G -TD 16 PL 0.25 (0.010) M C SEATING PLANE K T B S M F J A S DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 3.80 1.35 0.35 0.40 10.00 4.00 1.75 0.49 1.25 INCHES MIN MAX 0.386 0.150 0.054 0.014 0.016 0.393 0.157 0.068 0.019 0.049 1.27 BSC 0.19 0.10 0 5.80 0.25 0.25 0.25 7 6.20 0.50 0.050 BSC 0.008 0.004 0 0.229 0.010 0.009 0.009 7 0.244 0.019 Case 648-08 N Suffix 16-Pin Plastic -A16 9 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. 3. CONTROLLING DIMENSION: INCH. DIMENSION L" TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B" DOES NOT INCLUDE MOLD FLASH. 5. 6. ROUNDED CORNERS OPTIONAL. 648 01 THRU 07 OBSOLETE, NEW STANDARD 648 08. B 1 8 F S C -TK SEATING PLANE L H G D 16 PL 0.25 (0.010) M J M T A M DIM A B C D F G H J K L M S MILLIMETERS MIN MAX 18.80 6.35 3.69 0.39 1.02 19.55 6.85 4.44 0.53 1.77 INCHES MIN MAX 0.740 0.250 0.145 0.015 0.040 0.770 0.270 0.175 0.021 0.070 2.54 BSC 1.27 BSC 0.21 2.80 7.50 0 0.51 0.38 3.30 7.74 10 1.01 0.100 BSC 0.050 BSC 0.008 0.110 0.295 0 0.020 0.015 0.130 0.305 10 0.040 -A16 9 Case 620-09 J Suffix 16-Pin Ceramic Dual In-Line NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. -B1 8 3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIM F MAY NARROW TO 0.76 (0.030) WHERE THE LEAD ENTERS THE CERAMIC BODY. C L 5. 620 01 THRU 08 OBSOLETE, NEW STANDARD 620 09. -TSEATING PLANE K E F D 16 PL 0.25 (0.010) M N G T A S M J 16 PL 0.25 (0.010) M T B S DIM A B C D E F G J K L M N MILLIMETERS MIN MAX 19.05 6.10 19.55 7.36 4.19 0.39 0.53 INCHES MIN MAX 0.750 0.240 0.770 0.290 0.165 0.015 0.021 1.27 BSC 1.40 1.77 0.050 BSC 0.055 0.070 2.54 BSC 0.23 0.27 5.08 7.62 BSC 0 0.39 15 0.88 0.100 BSC 0.009 0.011 0.200 0.300 BSC 0 0.015 15 0.035 FAST AND LS TTL DATA 5-414 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters can and do vary in different applications. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. Literature Distribution Centers: USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England. JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan. ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. FAST AND LS TTL DATA 5-415 |
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