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MB91401
53
4. AC Characteristics
The following measurement conditions depending on the supply voltage apply to the MB91401 unless otherwise
specified.
(1) Clock
* : The clock frequency must be set to over 25 MHz for the Ethernet MAC interface to perform 100 Base
communication.
Parameter Symbol Pin Conditions
Value
Unit Remarks
Min Max
Input clock frequency
Fclkcyc XINI External clock 10.0 50.0 MHz
Fclkcyc
OSCEA,
OSCEB
Oscillation 10.0 50.0 MHz
Internal operating clock frequency
(FR70E/peripheral module)
Fclkin 50.0 MHz *
Internal operating clock frequency
(USBC)
Fusop 48.0 MHz
Internal operating clock frequency
(I
2
C IF)
Fi2op 12.5 MHz
External memory clock frequency MCLKO 50.0 MHz
• AC measurement condition
• Load condition
V
IH VDDE × 0.8 VOH VDDE/2
V
IL VDDE × 0.2 VOL VDDE/2
0 V
VCC
V
IL
VIH
0 V
VCC
V
OL
VOH
Input Output
C = 55 pF
XINI
OSCEA/OSCEB
Fclkcyc
Prelminary
2004.11.12