Cypress MB95310L Series, Manual

Page: 48 / 80

MB95310L/370L Series
Document Number: 002-07519 Rev. *A Page 48 of 80
18.4 AC Characteristics
18.4.1 Clock Timing
(V
CC
= 3.0 V

10%, V
SS
= 0.0 V, T
A
=

40

C to

85

C)
Parameter Symbol Pin name Condition
Value
Unit Remarks
Min Typ Max
Clock frequen-
cy
F
CH
X0, X1
—
1.00 — 16.25 MHz When the main oscillation circuit is used
1.00 — 32.50 MHz When the main external clock is used
3.00 — 8.13 MHz Main PLL multiplied by 2
3.00 — 6.5 MHz Main PLL multiplied by 2.5
3.00 — 4.06 MHz Main PLL multiplied by 4
F
CRH
—
12.25 12.5 12.75 MHz
Operating conditions:
• The main CR clock is used.
• T
A
=

10

C to

85

C
9.8 10 10.2 MHz
7.84 8 8.16 MHz
0.98 1 1.02 MHz
—
12.1875 12.5 12.8125 MHz
Operating conditions:
• The main CR clock is used.
• T
A
=

40

C to

10

C
9.75 10 10.25 MHz
7.8 8 8.2 MHz
0.975 1 1.025 MHz
F
CL
X0A, X1A
— 32.768 — kHz When the sub-oscillation circuit is used
— 32.768 — kHz When the sub-external clock is used
F
CRL
— 50 100 200 kHz When the sub-CR clock is used
Clock cycle
time
t
HCYL
X0, X1
—
61.5 — 1000 ns When the main oscillation circuit is used
30.8 — 1000 ns When the external clock is used
t
LCYL
X0A, X1A — 30.5 — µs When the subclock is used
Input clock
pulse width
t
WH1
t
WL1
X0
—
61.5 — — ns
When using external clock and the duty ra-
tio is about 30% to 70%
t
WH2
t
WL2
X0A — 15.2 — µs
Input clock rise
time and fall
time
t
CR
t
CF
X0, X0A X1: open — — 5 ns When the external clock is used
CR oscillation
start time
t
CRHWK
— — — — 150 µs When the main CR clock is used
t
CRLWK
— — — — 10 µs When the sub-CR clock is used