ICS1894-43
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE PHYCEIVER
IDT®
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE 31
ICS1894-43 REV A 030112
DC Operating Characteristics for REF_IN
The table below lists the 3.3V DC characteristics for the REF_IN pin.
DC Operating Characteristics for RMII Interface Pins
The table below lists DC operating characteristics for the Reduced Media Independent Interface (RMII) for the
ICS1894-43.
Timing Diagrams
Timing for Clock Reference (REF_IN) Pin
The table below lists the significant time periods for signals on the clock reference (REF_IN) pin. The REF_IN
Timing Diagram figure shows the timing diagram for the time periods.
REF_IN Timing Diagram
Parameter Symbol Min. Max. Units
Input High Voltage V
IH
2.97 – V
Input Low Voltage V
IL
–0.33 V
Parameter Conditions Min. Typ. Max. Units
RMII Input Pin Capacitance – – – 8 pF
RMII Output Pin Capacitance – – – 14 pF
RMII Output Drive Impedance VDDIO = 3.3V – 20 – Ω
Time
Period
Parameter Conditions Min. Typ. Max. Units
t1 REF_IN Duty Cycle (RMII) – 45 50 55 %
t2 REF_IN Period (RMII) – – 20 – ns