74LS251 ON Semiconductor, 74LS251 Datasheet
74LS251
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74LS251 Summary of contents
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... SN74LS251 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. ...
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... SN74LS251 CONNECTION DIAGRAM DIP (TOP VIEW PIN NAMES S – S Select Inputs Output Enable (Active LOW) Inputs 0 I – I Multiplexer Inputs Multiplexer Output Z Complementary Multiplexer Output NOTES TTL Unit Load (U.L HIGH/1 ...
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... H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care (Z) = High impedance (Off) SN74LS251 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 128 devices together. When the outputs of the 3-state devices are ...
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... Output Enable Time PZH Output PZL t Output Enable Time PZH Output PZL t Output Disable Time PHZ Output PLZ t Output Disable Time PHZ Output PLZ SN74LS251 (unless otherwise specified) Limits Min Typ Max Unit 2.0 V 0.8 V – 0.65 – 1.5 V 2.4 3.1 V 0.25 0.4 V 0.35 0.5 V ...
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... OUT Figure 1 PZL PLZ V OUT 1.3 V 0.5 V Figure SW1 TO OUTPUT UNDER TEST SW2 L * Includes Jig and Probe Capacitance. SN74LS251 1 1 OUT PZH 1 OUT LOAD CIRCUIT SYMBOL t PZH t PZL t PLZ t PHZ Figure 5 ...
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... SEATING –T– PLANE 0.25 (0.010 SN74LS251 N SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. ...
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... G K –T– SEATING PLANE 0.25 (0.010 SN74LS251 PACKAGE DIMENSIONS D SUFFIX PLASTIC SOIC PACKAGE CASE 751B–05 ISSUE 0.25 (0.010 http://onsemi.com 7 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14 ...
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... Nishi–Gotanda, Shinagawa–ku, Tokyo, Japan 141–8549 Phone: 81–3–5487–8345 Email: r14153@onsemi.com Fax Response Line: 303–675–2167 800–344–3810 Toll Free USA/Canada ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. http://onsemi.com 8 SN74LS251/D ...