KSZ8721BL Micrel Inc, KSZ8721BL Datasheet - Page 31

• Manufacturer Part Number: KSZ8721BL
• Description: IC TXRX PHY 10/100 3.3V 48-LQFP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KSZ8721BL

• Number Of Drivers/receivers: 1/1
• Protocol: MII, RMII
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Data Rate: 100Mbps
• No. Of Ports: 1
• Ethernet Type: IEEE 802.3u
• Supply Current: 151mA
• Supply Voltage Range: 3.3V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: LQFP
• No. Of Pins: 48
• Interface Type: MII, RMII
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1627 - BOARD EVALUATION FOR KSZ8721BMC576-1626 - BOARD EVALUATION FOR KSZ8721BL
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1028-5; 576-1511-5; 576-1511-5; KSZ8721BL

Micrel, Inc.
Reset Circuit Diagram
Micrel recommends the following discrete reset circuit as shown in Figure 10 when powering up the KS8721BL/SL device.
For the application where the reset circuit signal comes from another device (e.g., CPU, FPGA, etc), we recommend the
reset circuit as shown in Figure 11.
June 2009
Symbol
t
sr
Parameter
Stable Supply Voltages to Reset High
KS8721BL/SL
RST
Figure 10. Recommended Reset Circuit
Table 8. Reset Timing Parameters
D1
Figure 9. Reset Timing
10µF
VCC
C
31
R
10k
D2
D1, D2: 1N4148
RST_OUT_n
CPU/FPGA
Min
50
Typ
M9999-062509-1.3
Max
KS8721BL/SL
Units
µs