ICS1894-33
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE PHYCEIVER
IDT®
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE 31
ICS1894-33 REV A 021612
DC Operating Characteristics for REFIN
The table below lists the 3.3V DC characteristics for the REFIN pin.
DC Operating Characteristics for RMII Interface Pins
The table below lists DC operating characteristics for the Reduced Media Independent Interface (RMII) for the
ICS1894-33.
Timing Diagrams
Timing for Clock Reference (REFIN) Pin
The table below lists the significant time periods for signals on the clock reference (REFIN) pin. The REFIN Timing
Diagram figure shows the timing diagram for the time periods.
REFIN 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 REFIN Duty Cycle (RMII) – 45 50 55 %
t2 REFIN Period (RMII) – – 20 – ns
