KS8721B/BT Micrel, Inc. tsr tcs tch trc Supply Voltage RST_N Strap-In Value Strap-In / Output Pin Symbol Para" />
參數(shù)資料
型號： KSZ8721BI
廠商： Micrel Inc
文件頁數(shù)： 22/32頁
文件大?。?/td> 0K
描述： IC TXRX PHY 10/100 2.5V 48SSOP
標準包裝： 30
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 1/1
規(guī)程： MII，RMII
電源電壓： 2.375 V ~ 2.625 V
安裝類型： 表面貼裝
封裝/外殼： 48-BSSOP（0.295"，7.50mm 寬）
供應商設(shè)備封裝： 48-SSOP
包裝： 管件
產(chǎn)品目錄頁面： 1080 (CN2011-ZH PDF)
配用： 576-1627-ND - BOARD EVALUATION FOR KSZ8721BMC
576-1626-ND - BOARD EVALUATION FOR KSZ8721BL
其它名稱： 576-1027
March 2006
29
M9999-030106
KS8721B/BT
Micrel, Inc.
tsr
tcs tch
trc
Supply
Voltage
RST_N
Strap-In
Value
Strap-In /
Output Pin
Symbol
Parameter
Min
Typ
Max
Units
tsr
Stable Supply Voltages to Reset High
10
ms
sr
tcs
Conguration Set-Up Time
50
ns
tch
Conguration Hold Time
50
ns
trc
Reset to Strap-In Pin Output
50
s
Table 7. Reset Timing Parameters
Reset Circuit Diagram
Micrel recommendeds the following discrete reset circuit as shown in Figure 10 when powering up the KS8721B/BT 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 11.
VCC
R
10k
D2
C
10F
D1
CPU/FPGA
RST_OUT_n
KS8721B/BT
RST
D1, D2: 1N4148
Figure 10. Recommended Reset Circuit.
VCC
R
10k
C
10F
D1
KS8721B/BT
RST
D1: 1N4148
Figure 11. 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.
Symbol
Parameter
Stable Supply Voltages to Reset High
10
ms
Conguration Set-Up Time
50
ns
Conguration Hold Time
50
ns
Reset to Strap-In Pin Output
50
s
Stable Supply Voltages to Reset High
10
ms
Conguration Set-Up Time
50
ns
Conguration Hold Time
50
ns
Reset to Strap-In Pin Output
50
s
Min
Typ
Max
Units
Stable Supply Voltages to Reset High
10
ms
Conguration Set-Up Time
50
ns
Conguration Hold Time
50
ns
Reset to Strap-In Pin Output
50
s
Min
Typ
Max
Units
Stable Supply Voltages to Reset High
10
ms
Conguration Set-Up Time
50
ns
Conguration Hold Time
50
ns
Reset to Strap-In Pin Output
50
s
Min
Typ
Max
Units
Stable Supply Voltages to Reset High
10
ms
Conguration Set-Up Time
50
ns
Conguration Hold Time
50
ns
Reset to Strap-In Pin Output
50
s
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