DS90UB903QSQ/NOPB National Semiconductor, DS90UB903QSQ/NOPB Datasheet - Page 28

• Manufacturer Part Number: DS90UB903QSQ/NOPB
• Description: IC SER/DESER 10-43MHZ 18B 40LLP
• Manufacturer: National Semiconductor

Specifications of DS90UB903QSQ/NOPB

• Function: Serializer
• Data Rate: 900Mbps
• Input Type: LVCMOS
• Output Type: CML
• Number Of Inputs: 1
• Number Of Outputs: 1
• Voltage - Supply: 1.71 V ~ 1.89 V, 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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SLAVE CLOCK STRETCHING
In order to communicate and synchronize with remote de-
vices on the I
slave clock stretching must be supported by the I
controller/MCU. The chipset utilizes bus clock stretching
(holding the SCL line low) during data transmission; where
the I
I
will not control the clock and only stretches it until the remote
peripheral has responded; which is typically in the order of 12
us (typical).
2
C data transfer (before the ACK signal). The slave device
Resistor
(±0.1%)
2
RID Ω
12.1k
39.0k
C slave pulls the SCL line low on the 9th clock of every
GND
TABLE 3. ID[x] Resistor Value – DS90UB903Q
2.0k
4.7k
8.2k
0
ID[x] Resistor Value - DS90UB903Q Ser
2
C bus through the bidirectional control channel,
7b' 101 1010 (h'5A) 8b' 1011 0100 (h'B4)
7b' 101 1011 (h'5B) 8b' 1011 0110 (h'B6)
7b' 101 1100 (h'5C) 8b' 1011 1000 (h'B8)
7b' 101 1110 (h'5E) 8b' 1011 1100 (h'BC)
7b' 101 1000 (h'58) 8b' 1011 0000 (h'B0)
7b' 101 1001 (h'59) 8b' 1011 0010 (h'B2)
Address 7'b
(Note
11)
appended (WRITE)
FIGURE 27. Bidirectional Control Bus Connection
Address 8'b 0
FIGURE 26. START and STOP Conditions
2
C master
28
ID[X] ADDRESS DECODER
The ID[x] pin is used to decode and set the physical slave
address of the Serializer/Deserializer (I
six devices on the bus using only a single pin. The pin sets
one of six possible addresses for each Serializer/Deserializer
device. The pin must be pulled to VDD (1.8V, NOT VDDIO))
with a 10 kΩ resistor and a pull down resistor (RID) of the
recommended value to set the physical device address. The
recommended maximum resistor tolerance is 0.1% worst
case (0.2% total tolerance).
Resistor
(±0.1%)
RID Ω
12.1k
39.0k
GND
TABLE 4. ID[x] Resistor Value – DS90UB904Q
2.0k
4.7k
8.2k
0
ID[x] Resistor Value - DS90UB904Q Des
7b' 110 0000 (h'60) 8b' 1100 0000 (h'C0)
7b' 110 0001 (h'61) 8b' 1100 0010 (h'C2)
7b' 110 0010 (h'62) 8b' 1100 0100 (h'C4)
7b' 110 0011 (h'63) 8b' 1101 0110 (h'C6)
7b' 110 0100 (h'64) 8b' 1101 1000 (h'C8)
7b' 110 0110 (h'66) 8b' 1100 1100 (h'CC)
Address 7'b
(Note
30125443
11)
30125442
appended (WRITE)
2
C only) to allow up to
Address 8'b 0