參數(shù)資料
型號(hào): KS8995XA
廠商: Micrel Inc
文件頁數(shù): 44/51頁
文件大小: 0K
描述: IC SWITCH 10/100 5PORT 128PQFP
標(biāo)準(zhǔn)包裝: 66
系列: *
類型: *
應(yīng)用: *
安裝類型: 表面貼裝
封裝/外殼: 128-BFQFP
供應(yīng)商設(shè)備封裝: 128-PQFP(14x20)
包裝: 散裝
配用: 576-1604-ND - EVAL KIT EXPERIMENTAL KS8995XA
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
Parameter
Min
Typ
Max
Units
t
SR
Stable Supply Voltages to Reset High
10
ms
t
CS
Configuration Set-Up Time
50
ns
t
CH
Configuration Hold Time
50
ns
t
RC
Reset to Strap-In Pin Output
50
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
10F
D1
CPU/FPGA
RST_OUT_n
KS8995X
RST
D1, D2: 1N4148
Figure 20. Recommended Reset Circuit.
VCC
R
10k
C
10F
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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