DS90UB901QSQX/NOPB National Semiconductor, DS90UB901QSQX/NOPB Datasheet - Page 29

• Manufacturer Part Number: DS90UB901QSQX/NOPB
• Description: IC SER/DESER 10-43MHZ 16B 32LLP
• Manufacturer: National Semiconductor

Specifications of DS90UB901QSQX/NOPB

• Function: Serializer
• Data Rate: 688Mbps
• 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: 32-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
every I
device will not control the clock and only stretches it until the
remote peripheral has responded; which is typically in the or-
der of 12 us (typical).
2
C slave pulls the SCL line low prior to the 9th clock of
2
C data transfer (before the ACK signal). The slave
2
C bus through the bidirectional control channel,
FIGURE 25. START and STOP Conditions
FIGURE 24. Basic Operation
2
C master
FIGURE 23. Read Byte
29
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).
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2
C only) to allow up to
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