KSZ8995XA Micrel Inc, KSZ8995XA Datasheet - Page 49

• 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

Symbol
t
t
t
t
Reset Circuit Diagram
Micrel recommendeds the following discrete reset circuit as shown in Figure 20 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 21.
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.
May 2005
KS8995XA
SR
CS
CH
RC
Parameter
Stable Supply Voltages to Reset High
Configuration Set-Up Time
Configuration Hold Time
Reset to Strap-In Pin Output
Output Pin
Strap-In
Figure 21. Recommended Circuit for Interfacing with CPU/FPGA Reset
Voltage
Strap-In /
RST_N
Supply
Value
KS8995X
Figure 20. Recommended Reset Circuit.
Table 11. Reset Timing Parameters
RST
Figure 19. Reset Timing
KS8995X
D1
D1: 1N4148
tsr
RST
10µF
VCC
C
49
D1
R
10k
tcs
D2
10µF
tch
VCC
D1, D2: 1N4148
C
trc
R
10k
RST_OUT_n
CPU/FPGA
Min
10
50
50
50
Typ
M9999-051305
Max
Micrel, Inc.
Units
ms
ns
ns
ns