KSZ8721SL Micrel Inc, KSZ8721SL Datasheet - Page 32

• Manufacturer Part Number: KSZ8721SL
• Description: IC TXRX PHY 10/100 3.3V 48-SSOP
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KSZ8721SL

• Number Of Drivers/receivers: 1/1
• Protocol: IEEE 802
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1630 - BOARD EVALUATION FOR KSZ8721SL
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1031-5; 576-1512-5; 576-1512-5; KSZ8721SL

Micrel, Inc.
At power-on-reset, R, C, and D1 provide the necessary ramp rise time to reset the Micrel device. The reset out from
CPU/FPGA provides warm reset after power up. It is also recommended to power up the VDD core voltage earlier than
VDDIO voltage. At worst case, the both VDD core and VDDIO voltages should come up at the same time.
Reference Circuit for Strapping Option Configuration
Figure 12 shows the reference circuit for strapping option pins.
June 2009
Reference circuits for unmanaged programming through LED ports.
Figure 11. Recommended Circuit for Interfacing with CPU/FPGA Reset
Figure 12. Reference Circuit, Strapping Option Pins
KS8721BL/SL
KS8721BL/SL
Pull-down
KS8721BL/SL
Pull-Up
D1: 1N4148
RST
32
LED pin
LED pin
D1
10µF
VCC
C
3.3V
3.3V
R
10k
M9999-062509-1.3
KS8721BL/SL