TSU:DAT Data input se" />
參數(shù)資料
型號： KSZ9021RNI
廠商： Micrel Inc
文件頁數(shù)： 8/58頁
文件大小： 0K
描述： IC TXRX 10/100/1000 SGL 48QFN
標準包裝： 260
類型： 收發(fā)器
驅(qū)動器/接收器數(shù)： 8/8
規(guī)程： 千兆位以太網(wǎng)
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 48-VFQFN 裸露焊盤
供應商設(shè)備封裝： 48-QFN（7x7）
包裝： 托盤
配用： 576-3874-ND - BOARD EVALUATION FOR KSZ9021RN
其它名稱： 576-3978
KSZ9021RNI-ND
MCP444X/446X
DS22265A-page 16
2010 Microchip Technology Inc.
107
TSU:DAT Data input setup
time
100 kHz mode
250
—
ns
400 kHz mode
100
—
ns
1.7 MHz mode
10
—
ns
3.4 MHz mode
10
—
ns
109
TAA
Output valid
from clock
100 kHz mode
—
3450
ns
400 kHz mode
—
900
ns
1.7 MHz mode
—
150
ns
Cb = 100 pF,
—
310
ns
Cb = 400 pF,
3.4 MHz mode
—
150
ns
Cb = 100 pF, Note 1
110
TBUF
Bus free time
100 kHz mode
4700
—
ns
Time the bus must be free
before a new transmission
can start
400 kHz mode
1300
—
ns
1.7 MHz mode
N.A.
—
ns
3.4 MHz mode
N.A.
—
ns
TSP
Input filter spike
suppression
(SDA and SCL)
100 kHz mode
—
50
ns
Philips Spec states N.A.
400 kHz mode
—
50
ns
1.7 MHz mode
—
10
ns
Spike suppression
3.4 MHz mode
—
10
ns
Spike suppression
TABLE 1-3:
I2C BUS DATA REQUIREMENTS (SLAVE MODE) (CONTINUED)
I2C AC Characteristics
Standard Operating Conditions (unless otherwise specified)
Operating Temperature
–40
°C ≤ TA ≤ +125°C (Extended)
Operating Voltage VDD range is described in AC/DC characteristics
Param.
No.
Sym
Characteristic
Min
Max
Units
Conditions
Note 1:
As a transmitter, the device must provide this internal minimum delay time to bridge the undefined region
(minimum 300 ns) of the falling edge of SCL to avoid unintended generation of START or STOP conditions.
2:
A fast-mode (400 kHz) I2C-bus device can be used in a standard-mode (100 kHz) I2C-bus system, but the
requirement tSU;DAT ≥ 250 ns must then be met. This will automatically be the case if the device does not
stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the SCL signal,
it must output the next data bit to the SDA line
TR max.+tSU;DAT = 1000 + 250 = 1250 ns (according to the standard-mode I2C bus specification) before
the SCL line is released.
3:
The MCP44X1/MCP44X2 device must provide a data hold time to bridge the undefined part between VIH
and VIL of the falling edge of the SCL signal. This specification is not a part of the I2C specification, but
must be tested in order to ensure that the output data will meet the setup and hold specifications for the
receiving device.
4:
Use Cb in pF for the calculations.
5:
Not Tested.
6:
A Master Transmitter must provide a delay to ensure that difference between SDA and SCL fall times do
not unintentionally create a Start or Stop condition.
7:
Ensured by the TAA 3.4 MHz specification test.
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