The TTL HIGH level source current is higher than the LOW level sinking current.

More Questions from Logic Families and Their Characteristics

• The most common TTL series ICs are:
• The rise time (tr) is the time it takes for a pulse to rise from its ________ point up to its ________ point. The fall time (tf) is the length of time it takes to fall from the ________ to the ________ point.
• Ten TTL loads per TTL driver is known as:
• Why is a pull-up resistor needed for an open collector gate?
• If all inputs to a TTL NAND gate are low, what is the ON, OFF condition of each transistor in the circuit?
• Assume that a particular IC has a supply voltage (Vcc) equal to +5 V and ICCH = 10 mA and ICCL = 23 mA. What is the power dissipation for the chip?
• Fan-out is determined by taking the ________ result(s) of ________.
• Why is a pull-up resistor needed when connecting TTL logic to CMOS logic?
• The output current capability of a single 7400 NAND gate when HIGH is called ________.
• What should be done to unused inputs on TTL gates?

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