UPD75402ACT datasheet(30/48 Pages) NEC

30 / 48 page

µPD75402A(A)

Resonator

Ceramic

resonator

Crystal

External

clock

Recommended

constant

Parameter

Oscillator

frequency

(fXX) Note 1

Oscillation

settling time

Note 2

Oscillator

frequency

(fXX) Note 1

Oscillation

settling time

Note 2

X1 input

frequency

(fX) Note 1

X1 input

high/low

level width

(tXH, tXL)

CHARACTERISTICS OF THE OSCILLATION CIRCUIT (Ta = –40 to +85 ˚C, V DD = 2.7 to 6.0 V)

Notes 1. The oscillator frequency and X1 input frequency indicate only the oscillator characteristics. See

the item of AC characteristics for the instruction execution time.

2. The oscillation settling time means the time required for the oscillation to settle after VDD is applied

or after the STOP mode is released.

3. When 4.19 MHz < fX

≤ 5.0 MHz, do not select PCC = 0011 as the instruction execution time. When

PCC = 0011, one machine cycle falls short of 0.95

µs, the minimum value for the standard.

Caution When the clock oscillator is used, conform to the following guidelines when wiring at the

portions surrounded by dotted lines in the figures above to eliminate the influence of the wiring

capacity.

• The wiring must be as short as possible.

• Other signal lines must not run in these areas.

• Any line carrying a high fluctuating current must be kept away as far as possible.

• The grounding point of the capacitor of the oscillator must have the same potential as that

of VSS. It must not be grounded to ground patterns carrying a large current.

• No signal must be taken from the oscillator.

CAPACITANCE (Ta = 25 ˚C, V DD = 0 V)

Unit

MHz

Min.

2.0

100

Typ.

4.19

Max.

5.0 Note 3

250

Conditions

VDD = oscillation

voltage range

After VDD reaches

MIN. of the oscilla-

tion voltage range

VDD = 4.5 to 6.0 V

µPD74HCU04

Parameter

Input capacitance

Output capacitance

I/O capacitance

Symbol

CIN

COUT

CIO

Min.

Typ.

Max.

Unit

Conditions

f = 1 MHz

0 V for pins other than pins to be

measured

UPD75402ACT Datasheet(PDF) 30 Page - NEC

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