sttl_asttl-2sp - Open-Collector TTL Mostly used in data...

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1 Open-Collector TTL Mostly used in data busses where multiple gate outputs must be ANDed. • This can be accomplished by using a single pull-up resistor with open-collector TTL gates • This type of connection is referred to as wired-AND . Low Power TTL (LTTL) Accomplished simply by increasing the resistance values. However this results in • Decreased fan-out • Longer transient-response times
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2 LTTL Example Compare the power dissipation of the LTTL and TTL gates. I RB(OL) = 67.5 μ A I RC(OL) = 200 μ A I RB(OH) = 100 μ A P CC(avg) = 919 μ W TTL vs LTTL power dissipation ratio = 10.4 / 0.919 = 11.3 High Speed TTL (HTTL) Accomplished simply by decreasing the resistance values. However this results in • Increased power dissipation
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3 Schottky Tansistor-Transistor Logic (STTL) Schottky Barrier MN diode Schottky-clamped BJT (Schottky Transistor)
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4 Multi-Emitter Fabrication Examples Modes of Operation for SBJT 1. OFF 2. FA 3. On Hard 4. Reverse Schottky
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5 Example (SBJT) Example: Draw the VTC graph of the SBJT inverter shown below STTL NAND Gate
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sttl_asttl-2sp - Open-Collector TTL Mostly used in data...

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