UPD75216ACW Time Required For Oscillation To Become Stabilized After V - NEC

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UPD75216ACW

Manufacturer Part Number
UPD75216ACW
Description
4-BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC
Datasheet
MAIN SYSTEM CLOCK OSCILLATOR CHARACTERISTICS (Ta = –40 to +85 C, V
RESONATOR
RECOMMENDED CIRCUIT
X1
X2
Ceramic
resonator*1
C1
C2
X1
X2
Crystal
resonator*1
C1
C2
X1
X2
External
clock
PD74HCU04
* 1. Refer to RECOMMENDED OSCILLATOR CONSTANTS.
2. Oscillator characteristics only. Refer to the description of AC characteristics for details of instruction execution
time.
3. Time required for oscillation to become stabilized after V
voltage range or STOP mode release.
4. When oscillator frequency is “4.19 < f
If “PCC = 0011” is selected, 1 machine cycle becomes less than 0.95 s, with the result that the specified MIN.
value of 0.95 s cannot be observed.
Note
When the main system clock oscillator is used, the following should be noted concerning wiring in the area
in the figure enclosed by a dotted line to prevent the influence of wiring capacitance, etc.
• The wiring should be kept as short as possible.
• No other signal lines should be crossed. Keep away from lines carrying a high fluctuating current.
• The oscillator capacitor grounding point should always be at the same potential as V
to a ground pattern carrying a high current.
• A signal should not be taken from the oscillator.
48
PARAMETER
TEST CONDITIONS
Oscillator frequency
V
= Oscillation
DD
(f
) *2
voltage range
XX
After V
reaches the
DD
Oscillation
minimum value in
stabilization time *3
the oscillation
voltage range
Oscillator frequency
(f
) *2
XX
V
= 4.5 to 6.0 V
DD
Oscillation stabilization
time *3
X1 input frequency
(f
) *2
X
X1 input high and low
level widths (t
, t
)
XH
XL
reaches the minimum value in the oscillation
DD
< – 5.0 MHz”, do not select “PCC = 0011” as instruction execution time.
XX
PD75216A
= 2.7 to 6.0 V )
DD
MIN.
TYP.
MAX.
UNIT
2.0
5.0
MHz
4
ms
2.0
4.19
5.0 *4
MHz
10
ms
30
ms
5.0
MHz
2.0
250
100
ns
. Do not connect
SS

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