KSZ8041RNL-EVAL Micrel Inc, KSZ8041RNL-EVAL Datasheet - Page 16

• Manufacturer Part Number: KSZ8041RNL-EVAL
• Description: BOARD EVALUATION FOR KSZ8041RNL
• Manufacturer: Micrel Inc

Specifications of KSZ8041RNL-EVAL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-3863

Description of Differences
Core Power 1.8 to 1.2V
The KSZ8051 uses 1.2V low core power for the low power consumption. Power is supplied by an internal LDO.
IO Power
The KSZ8051 support Digital IO power of 1.8, 2.5 or 3.3V. The KSZ8041 supports on 3.3V only.
Strapping Options
Pins 19 and 21 are new resistor strapping options on the 8051MNL/RNL. Pins 21 and 32 are the new strapping options
for the 8051MLL. Details described above.
LDO (Internal 1.2V Regulator)
Pin 2 and 4 are the core power for the 8051MNL/RNL and 8051MLL respectively. Core power on the 8041 was 1..8V. It is
1.2V on the 8051.
REXT
100pf cap not needed for REXT on 8051.
Transformer
The quad transformer should be changed to part number H1664NL(Pulse). The internal center taps of RX and TX is must
be disconnected.
On Chip Termination and Bias
KSZ8051 supports on-chip termination and internal biasing, so all external 49.9ohm termination resistors on the RX pair
and TX pair must be removed. Do not connect the transformer center center tap to VDDAT. Just leave the center taps
open or go through two capacitors to ground separately for RX and TX paths.
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December 2010
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Application Note 143
M9999-120610-A