KSZ8995XA Micrel Inc, KSZ8995XA Datasheet - Page 53

• Manufacturer Part Number: KSZ8995XA
• Description: IC SWITCH 10/100 5PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8995XA

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 5
• Internal Memory Buffer Size: 64
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII/SNI
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1642 - BOARD EVALUATION FOR KSZ8995XA
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1042

September 2008
Reset Circuit Diagram
Micrel recommends the following discrete reset circuit as shown in Figure 16 when powering up the KS8895XA
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 17.
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.
Figure 17. Recommended Circuit for Interfacing with CPU/FPGA Reset
KS8995XA
RST
Figure 16. Recommended Reset Circuit
KS8995XA
D1
D1: 1N4148
RST
10µF
VCC
C
D1
R
10k
53
D2
10µF
VCC
D1, D2: 1N4148
C
R
10k
RST_OUT_n
CPU/FPGA
M9999-091508