KS8995MAL Micrel Inc, KS8995MAL Datasheet - Page 71

• Manufacturer Part Number: KS8995MAL
• Description: IC SWITCH 10/100 5PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KS8995MAL

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• For Use With: 576-1017 - BOARD EVAL EXPERIMENT KS8995M
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Symbol
t
t
t
t
Reset Circuit Diagram
Micrel recommendeds the following discrete reset circuit as shown in Figure 23 when powering up the KS8895MA 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 24.
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
KS8995MA
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 24. Recommended Circuit for Interfacing with CPU/FPGA Reset
Voltage
Strap-In /
RST_N
Supply
Value
KS8995MA
Figure 23. Recommended Reset Circuit.
Table 23. Reset Timing Parameters
RST
Figure 22. Reset Timing
KS8995MA
D1
D1: 1N4148
tsr
RST
10µF
VCC
C
71
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