DS90UB921-Q1 Datasheet, PDF (5/57 Pages) Texas Instruments – 5 - 96 MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel

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DS90UB921-Q1
SNLS488 – MARCH 2016
Pin Functions (continued)
NAME
PIN
NUMBER
I/O, TYPE
DESCRIPTION
STATUS - Layout note: for unused interface pins, leave as No Connect
INTB
31
O, Open Drain Interrupt
INTB = H, normal
INTB = L, Interrupt request
Typically connected with 4.7kΩ to VDDIO.
REM_INTB
16
O, LVCMOS, Interrupt. Mirrors status of INTB_IN from the remote deserializer. Note: REM_INTB
PD
will be driven LOW until lock is achieved with the downstream deserializer.
REM_INTB = H, normal
REM_INTB = L, interrupt request
FPD-LINK III SERIAL INTERFACE
DOUT+
20
O, LVDS True Output
The output must be AC-coupled per the typical connection diagram.
DOUT-
19
O, LVDS Inverting Output
The output must be AC-coupled per the typical connection diagram.
CMF
23
POWER AND GROUND ⁽¹⁾
CAP
Common Mode Filter.
Typically connected with 0.1µF to GND
VDD33
22
Power
Power to on-chip regulator 3.0 V - 3.6 V. Typically connected with 4.7 uF to GND
VDDIO
30
Power
LVCMOS I/O Power 1.71 V - 1.89 V OR 3.0 V - 3.6 V. Typically connected with 4.7
uF to GND
GND
DAP
Ground
DAP is the large metal contact at the bottom side, located at the center of the WQFN
package. Connect to the ground plane (GND) with at least 9 vias.
REGULATOR CAPACITOR
CAPHS12,
CAPP12
17, 14
CAP
Decoupling capacitor connection for on-chip regulator. Typically connected with 4.7uF
to GND at each CAP pin.
CAPL12
7
CAP
Decoupling capacitor connection for on-chip regulator. Typically connected with two
4.7uF to GND at this CAP pin.
OTHERS
RES1
18
GND
Reserved. Tie to Ground.
(1) The VDD (VDD33 and VDDIO) supply ramp should be faster than 1.5 ms with a monotonic rise.
The definitions below define the functionality of the I/O cells for each pin. I/O TYPE:
• CAP = Capacitor connection
• LVCMOS = LVCMOS pin; Referenced to VDDIO IO supply
• I = Input
• O = Output
• I/O = Input/Output
• S = Strap pin. All strap pins have weak internal pull-ups or pull-downs. If the default strap value is needed to
be changed then an external resistor should be used.
• PD, PU = Weak Internal Pull-Down/Pull-Up
• Multi-function pin
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