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SN54LS298 Fiches technique(PDF) 2 Page - Motorola, Inc |
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SN54LS298 Fiches technique(HTML) 2 Page - Motorola, Inc |
2 / 6 page 5-474 FAST AND LS TTL DATA SN54/74LS298 LOGIC OR BLOCK DIAGRAM S I1a I0a I1b I0b I1c I0c I1d I0d CP R CP S Qa R CP S Qb Qa Qb Qc Qd 14 1 2 6 7 3 4 5 9 11 12 10 13 15 VCC = PIN 16 GND = PIN 8 = PIN NUMBERS R CP S Qc R CP S Qd FUNCTIONAL DESCRIPTION The LS298 is a high speed Quad 2-Port Register. It selects four bits of data from two sources (ports)under the control of a Common Select Input (S). The selected data is transferred to the 4-bit output register synchronous with the HIGH to LOW transition of the Clock input (CP). The 4-bit output register is fully edge-triggered. The Data inputs (I) and Select input (S) must be stable only one setup time prior to the HIGH to LOW transition of the clock for predictable operation. TRUTH TABLE INPUTS OUTPUT S I0 I1 Q I I X L I h X H h X I L h X h H L = LOW Voltage Level H = HIGH Voltage Level X = Don’t Care I = LOW Voltage Level one setup time prior to the HIGH to LOW clock transition. h = HIGH Voltage Level one setup time prior to the HIGH to LOW clock transition. GUARANTEED OPERATING RANGES Symbol Parameter Min Typ Max Unit VCC Supply Voltage 54 74 4.5 4.75 5.0 5.0 5.5 5.25 V TA Operating Ambient Temperature Range 54 74 – 55 0 25 25 125 70 °C IOH Output Current — High 54, 74 – 0.4 mA IOL Output Current — Low 54 74 4.0 8.0 mA |
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Description similaire - SN54LS298 |
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