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SN54LSXXJ Datasheet(PDF) 1 Page - Motorola, Inc |
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SN54LSXXJ Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 4 page NOTES: tn = bit time before enable negative-going transition tn+1 = bit time after enable negative-going transition 5-1 FAST AND LS TTL DATA 4-BIT D LATCH The TTL/MSI SN54 / 74LS75 and SN54 / 74LS77 are latches used as tem- porary storage for binary information between processing units and input /out- put or indicator units. Information present at a data (D) input is transferred to the Q output when the Enable is HIGH and the Q output will follow the data input as long as the Enable remains HIGH. When the Enable goes LOW, the information (that was present at the data input at the time the transition oc- curred) is retained at the Q output until the Enable is permitted to go HIGH. The SN54 / 74LS75 features complementary Q and Q output from a 4-bit latch and is available in the 16-pin packages. For higher component density applications the SN54 / 74LS77 4-bit latch is available in the 14-pin package with Q outputs omitted. 14 13 12 11 10 9 1 2345 6 7 16 15 8 CONNECTION DIAGRAMS DIP (TOP VIEW) SN54 / 74LS75 14 13 12 11 10 9 123456 8 7 SN54 / 74LS77 Q0 Q0 Q1 Q1 E0–1 GND Q2 Q2 Q3 D0 D1 E2–3 VCC D2 D3 Q3 Q0 Q1 E0–1 GND NC Q2 Q3 D0 D1 E2–3 VCC D2 D3 NC PIN NAMES LOADING (Note a) HIGH LOW D1–D4 E0–1 E2–3 Q1–Q4 Q1–Q4 Data Inputs Enable Input Latches 0, 1 Enable Input Latches 2, 3 Latch Outputs (Note b) Complimentary Latch Outputs (Note b) 0.5 U.L. 2.0 U.L. 2.0 U.L. 10 U.L. 10 U.L. 0.25 U.L. 1.0 U.L. 1.0 U.L. 5 (2.5) U.L. 5 (2.5) U.L. NOTES: a) 1 Unit Load (U.L.) = 40 µA HIGH. b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) Temperature Ranges. TRUTH TABLE (Each latch) tn tn+1 D H L Q H L SN54/74LS75 SN54/74LS77 4-BIT D LATCH LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 N SUFFIX PLASTIC CASE 648-08 16 1 16 1 ORDERING INFORMATION SN54LSXXJ Ceramic SN74LSXXN Plastic SN74LSXXD SOIC 16 1 D SUFFIX SOIC CASE 751B-03 J SUFFIX CERAMIC CASE 632-08 N SUFFIX PLASTIC CASE 646-06 14 1 14 1 14 1 D SUFFIX SOIC CASE 751A-02 |
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