DS100KR401_13 Datasheet, PDF (11/38 Pages) Texas Instruments – Ultra Low Power, 4 Lane (8-channel, bi-directional) Repeater for Data-rates up to 10.3 Gbps

DS100KR401
www.ti.com
Level
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DEMA1
DEMB1
0
0
0
0
R
R
R
R
Float
Float
Float
Float
1
1
1
1
SNLS395B – JANUARY 2012 – REVISED MARCH 2012
Table 3. De-emphasis and Output Voltage Settings
DEMA0
DEMB0
0
R
Float
1
0
R
Float
1
0
R
Float
1
0
R
Float
1
VOD Vp-p
0.8
0.9
0.9
1.0
1.0
1.0
1.1
1.1
1.1
1.2
1.2
1.2
1.3
1.3
1.3
1.3
DEM dB
0
0
- 3.5
0
- 3.5
-6
0
- 3.5
-6
0
- 3.5
-6
0
- 3.5
-6
-9
Inner Amplitude
Vp-p
0.8
0.9
0.6
1.0
0.7
0.5
1.1
0.7
0.6
1.2
0.8
0.6
1.3
0.9
0.7
0.5
Suggested Use
FR4 <5 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 <5 inch 4–mil trace
FR4 10 inch 4–mil trace
FR4 15 inch 4–mil trace
FR4 20 inch 4–mil trace
Table 4. Signal Detect Threshold Level⁽¹⁾
SD_TH
0
R
F (default)
1
SMBus REG bit [3:2] and [1:0]
10
01
00
11
Assert Level (typ)
210 mVp-p
160 mVp-p
180 mVp-p
190 mVp-p
(1) VDD = 2.5V, 25°C and 0101 pattern at 10.3 Gbps
De-assert Level (typ)
150 mVp-p
100 mVp-p
110 mVp-p
130 mVp-p
SMBUS Master Mode
The DS100KR401 devices support reading directly from an external EEPROM device by implementing SMBus
Master mode. When using the SMBus master mode, the DS100KR401 will read directly from specific location in
the external EEPROM. When designing a system for using the external EEPROM, the user needs to follow these
specific guidelines.
• Set ENSMB = Float — enable the SMBUS master mode.
• The external EEPROM device address byte must be 0xA0'h and capable of 400 kHz operation at 2.5V and
3.3V supply.
• Set the AD[3:0] inputs for SMBus address byte. When the AD[3:0] = 0000'b, the device address byte is B0'h.
When tying multiple DS100KR401 devices to the SDA and SCL bus, use these guidelines to configure the
devices.
• Use SMBus AD[3:0] address bits so that each device can loaded it's configuration from the EEPROM.
Example below is for 4 device.
– U1: AD[3:0] = 0000 = 0xB0'h,
– U2: AD[3:0] = 0001 = 0xB2'h,
– U3: AD[3:0] = 0010 = 0xB4'h,
– U4: AD[3:0] = 0011 = 0xB6'h
• Use a pull-up resistor on SDA and SCL; value = 2k ohms
• Daisy-chain READEN# (pin 26) and ALL_DONE# (pin 27) from one device to the next device in the sequence
so that they do not compete for the EEPROM at the same time.
– 1. Tie READEN# of the 1st device in the chain (U1) to GND
– 2. Tie ALL_DONE# of U1 to READEN# of U2
Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: DS100KR401
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