參數(shù)資料
型號(hào): KSZ8995XA
廠商: MICREL INC
元件分類: 網(wǎng)絡(luò)接口
英文描述: Integrated 5-Port 10/100 QoS Switch
中文描述: DATACOM, LAN SWITCHING CIRCUIT, PQFP128
封裝: LEAD FREE, PLASTIC, QFP-128
文件頁(yè)數(shù): 49/51頁(yè)
文件大小: 305K
代理商: KSZ8995XA
May 2005
49
M9999-051305
KS8995XA
Micrel, Inc.
tsr
tcs
tch
trc
Supply
Voltage
RST_N
Strap-In
Value
Strap-In /
Output Pin
Figure 19. Reset Timing
Symbol
t
SR
t
CS
t
CH
t
RC
Parameter
Stable Supply Voltages to Reset High
Configuration Set-Up Time
Configuration Hold Time
Reset to Strap-In Pin Output
Min
10
50
50
50
Typ
Max
Units
ms
ns
ns
ns
Table 11. Reset Timing Parameters
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.
VCC
R
10k
D2
C
10μF
D1
CPU/FPGA
RST_OUT_n
KS8995X
RST
D1, D2: 1N4148
Figure 20. Recommended Reset Circuit.
VCC
R
10k
C
10μF
D1
KS8995X
RST
D1: 1N4148
Figure 21. Recommended Circuit for Interfacing with CPU/FPGA Reset
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.
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