mb90f378 Fujitsu Microelectronics, Inc., mb90f378 Datasheet - Page 42

• Manufacturer Part Number: mb90f378
• Description: 16-bit Proprietary Microcontroller
• Manufacturer: Fujitsu Microelectronics, Inc.

42
MB90378 Series
4. AC Characteristics
(1) Clock Timings
Clock frequency
Clock cycle time
Frequency
fluctuation rate
locked*
Input clock pulse
width
Input clock rise/fall
time
Internal operating
clock frequency
Internal operating
clock cycle time
Parameter
Symbol Pin name Condition
P
t
P
t
P
P
f
t
HCYL
f
LCYL
t
f
t
f
t
∆f
LCP
LCP
WHL
CH
WLL
CR
CF
CP
CP
CL
WH
WL
(V
CC
X0A, X1A
X0A, X1A
= 2.7 V to 3.6 V, AV
X0, X1
X0, X1
X0A
X0
X0
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
CC
= 2.7 V to 3.6 V, V
31.25
Min
1.5
50
⎯
⎯
⎯
⎯
⎯
⎯
⎯
3
4
4
4
4
3
4
4
4
4
5
32.768
Value
8.192
122.1
30.5
15.2
Typ
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
SS
Max
6.67
6.67
= AV
333
666
16
16
10
32
20
10
20
⎯
⎯
⎯
⎯
⎯
⎯
5
5
5
5
SS
= 0.0 V, T
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz
MHz Main clock operation
Unit
kHz
kHz Sub-clock operation
ns
µs
ns
µs
ns
ns
µs
%
When using an
oscillation circuit
PLL × 1 When using an
oscillation circuit
PLL × 2 When using an
oscillation circuit
PLL × 3 When using an
oscillation circuit
PLL × 4 When using an
oscillation circuit
When using an external
clock
PLL × 1 When using an
external clock
PLL × 2 When using an
external clock
PLL × 3 When using an
external clock
PLL × 4 When using an
external clock
Recommend duty
ratio of 30% to 70%
Recommend duty
ratio of 30% to 70%
External clock
operation
Main clock operation
Sub-clock operation
× 1/2 (When PLL stops)
× 1/2 (When PLL stops)
A
= −40 °C to +85 °C)
Remarks