Datasheet

SN54HC32

SN74HC32

SCLS200E –DECEMBER 1982–REVISED JULY 2016

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10 Power Supply Recommendations

The power supply can be any voltage between the minimum and maximum supply voltage rating located in

Recommended Operating Conditions. Each V

pin must have a good bypass capacitor to prevent power

disturbance. For devices with a single supply, TI recommends a 0.1-μF bypass capacitor. If there are multiple

pins, TI recommends a 0.01-μF or 0.022-μF bypass capacitors for each power pin. It is acceptable to parallel

multiple bypass capacitors to reject different frequencies of noise. Two bypass capacitors of value 0.1-μF and 1-

μF are commonly used in parallel. For best results, install the bypass capacitor(s) as close to the power pin as

possible.

11 Layout

11.1 Layout Guidelines

When using multiple bit logic devices, inputs must not float. In many cases, functions or parts of functions of

digital logic devices are unused. Some examples are when only two inputs of a triple-input AND gate are used,

or when only 3 of the 4-buffer gates are used. Such input pins must not be left unconnected because the

undefined voltages at the outside connections result in undefined operational states. Specified in Absolute

Maximum Ratings are rules that must be observed under all circumstances. All unused inputs of digital logic

devices must be connected to a high or low bias to prevent them from floating. The logic level that must be

applied to any particular unused input depends on the function of the device. Generally they are tied to GND or

, whichever makes more sense or is more convenient. It is acceptable to float outputs unless the part is a

transceiver. If the transceiver has an output enable pin, it disables the outputs section of the part when asserted.

This does not disable the input section of the I/Os so they also cannot float when disabled.

11.2 Layout Example

Figure 8. Layout Recommendation