KS8721BL TR Micrel Inc, KS8721BL TR Datasheet - Page 31

• Manufacturer Part Number: KS8721BL TR
• Description: IC TXRX PHY 10/100 3.3V 48LQFP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KS8721BL TR

• Number Of Drivers/receivers: 1/1
• Protocol: MII, RMII
• Voltage - Supply: 2.375 V ~ 2.625 V
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• For Use With: 576-1007 - BOARD EVAL EXPERIMENT KS8721BL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: KS8721BLTR

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