1894K-32LF IDT, 1894K-32LF Datasheet - Page 30

• Manufacturer Part Number: 1894K-32LF
• Description: Ethernet ICs 3.3V 10/100 PHY RMII
• Manufacturer: IDT

Specifications of 1894K-32LF

• Rohs: yes
• Part # Aliases: ICS1894K-32LF

Recommended Component Values
ICS1894-32 TCSR
IDT® 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
ICS1894-32
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
VDD
TCSR Resistor Value
LED Resistor Value
Note:
1. The bias resistor network sets the 10baseT and 100baseTX output amplitude levels.
2. Amplitude is directly related to current sourced out of the TCSR pin.
3. Resistor values shown above are typical. User should check amplitudes and adjust for transformer effects.
4. The 18.2K resistor provides negative feedback to compensate for VDD changes. Reducing the value of
this resistor will lower the 100baseT amplitude. Reducing the value of the resistor to ground on the other
hand will increase the output signal amplitude.
Parameter
VDD
7
Minimum
–
ICS1894-32
1.82k to GND
18.2k to VDD
Typical
1k
18.2KΩ 1%
1.82KΩ 1%
30
Maximum
–
TCSR
8
Tolerance
ICS1894-32
1%
–
PHYCEIVER
REV M 021512
Units
Ω
Ω