102A (5) T
參數(shù)資料
型號： KSZ9021RN
廠商： Micrel Inc
文件頁數(shù)： 7/58頁
文件大?。?/td> 0K
描述： IC TXRX 10/100/1000 SGL 48QFN
特色產(chǎn)品： KSZ9021RN Single-port Gigabit Transceiver
標(biāo)準(zhǔn)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(yīng)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： 576-3637
KSZ9021RN-ND
2010 Microchip Technology Inc.
DS22265A-page 15
MCP444X/446X
102A (5)
TRSCL
SCL rise time
100 kHz mode
—
1000
ns
Cb is specified to be from
10 to 400 pF (100 pF maxi-
mum for 3.4 MHz mode)
400 kHz mode
20 + 0.1Cb
300
ns
1.7 MHz mode
20
80
ns
1.7 MHz mode
20
160
ns
After a Repeated Start con-
dition or an Acknowledge
bit
3.4 MHz mode
10
40
ns
3.4 MHz mode
10
80
ns
After a Repeated Start
condition or an Acknowl-
edge bit
102B (5)
TRSDA
SDA rise time
100 kHz mode
—
1000
ns
Cb is specified to be from
10 to 400 pF (100 pF max
for 3.4 MHz mode)
400 kHz mode
20 + 0.1Cb
300
ns
1.7 MHz mode
20
160
ns
3.4 MHz mode
10
80
ns
103A (5)
TFSCL
SCL fall time
100 kHz mode
—
300
ns
Cb is specified to be from
10 to 400 pF (100 pF max
for 3.4 MHz mode)
400 kHz mode
20 + 0.1Cb
300
ns
1.7 MHz mode
20
80
ns
3.4 MHz mode
10
40
ns
103B (5)
TFSDA
SDA fall time
100 kHz mode
—
300
ns
Cb is specified to be from
10 to 400 pF (100 pF max
for 3.4 MHz mode)
400 kHz mode
20 + 0.1Cb (4)
300
ns
1.7 MHz mode
20
160
ns
3.4 MHz mode
10
80
ns
106
THD:DAT Data input hold
time
100 kHz mode
0
—
ns
1.8V-5.5V, Note 6
400 kHz mode
0
—
ns
2.7V-5.5V, Note 6
1.7 MHz mode
0
—
ns
4.5V-5.5V, Note 6
3.4 MHz mode
0
—
ns
4.5V-5.5V, Note 6
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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