Specifications

52 Maxim Integrated
HDCP Gigabit Multimedia Serial
Link Serializer/Deserializer
MAX9263/MAX9264
required external resistor connections. LFLT = low when
a line fault is detected and LFLT goes high when the line
returns to normal. The line-fault type is stored in 0x08,
D[3:0] of the serializer. Filter LFLT with the FC to reduce
the detector’s susceptibility to brief ground shifts. The
fault detector threshold voltages are referenced to the
serializer ground. Additional passive components set
the DC level of the cable (Figure 3). If the serializer and
deserializer grounds are different, the link DC voltage
during normal operation can vary and cross one of the
fault detection thresholds. For the fault detection circuit,
select the resistor’s power rating to handle a short to the
battery.
To detect the short-together case, refer to Application
Note 4709: GMSL line-fault detection. Table 17 lists the
mapping for line-fault types.
Staggered Parallel Data Outputs
The deserializer staggers the parallel data outputs to
reduce EMI and noise. Staggering outputs also reduces
the power-supply transient requirements. By default,
the deserializer staggers outputs according to Table 18
Disable output staggering through the DISSTAG bit
(0x06, D7).
Internal Input Pulldowns
The control and configuration inputs on the serial-
izer/deserializer include a pulldown resistor to GND.
Pulldowns are disabled when the device is shut down
(PWDN = low) or put into sleep mode. Keep all inputs
driven or use external pullup/pulldown resistors to pre-
vent additional current consumption and undesired con-
figuration due to undefined inputs.
Choosing I
2
C/UART Pullup Resistors
Both I
2
C/UART open-drain lines require pullup resistors
to provide a logic-high level. There are tradeoffs between
power dissipation and speed, and a compromise made
in choosing pullup resistor values. Every device connect-
ed to the bus introduces some capacitance even when
the device is not in operation. I
2
C specifies 300ns rise
times to go from low to high (30% to 70%) for fast mode,
which is defined for data rates up to 400kbps (see the
I
2
C specifications in the Electrical Characteristics table
for details). To meet the fast-mode rise-time requirement,
choose the pullup resistors so that rise time t
R
= 0.85 x
R
PULLUP
x C
BUS
< 300ns. The waveforms are not recog-
nized if the transition time becomes too slow. The serial-
izer/deserializer support I
2
C/UART rates up to 1Mbps.
Table 17. Serializer Line-Fault Mapping*
Table 18. Staggered Output Delay
*For the short-together case, refer to Application Note 4709: MAX9259 GMSL line-fault detection.
REGISTER
ADDRESS
BITS NAME VALUE LINE-FAULT TYPE
0x08
D[3:2] LFNEG
00 Negative cable wire shorted to supply voltage.
01 Negative cable wire shorted to ground.
10 Normal operation.
11 Negative cable wire disconnected.
D[1:0] LFPOS
00 Positive cable wire shorted to supply voltage.
01 Positive cable wire shorted to ground.
10 Normal operation.
11 Positive cable wire disconnected.
OUTPUT
OUTPUT DELAY RELATIVE TO DOUT0 (ns)
DISSTAG = 0 DISSTAG = 1
DOUT0–DOUT5, DOUT21, DOUT22 0 0
DOUT6–DOUT10, DOUT23, DOUT24 0.5 0
DOUT11–DOUT15, DOUT25, DOUT26 1 0
DOUT16–DOUT20, DOUT27, DOUT28 1.5 0
PCLKOUT 0.75 0