MAX9272GTM/V+ Maxim Integrated, MAX9272GTM/V+ Datasheet - Page 38

• Manufacturer Part Number: MAX9272GTM/V+
• Description: Serializers & Deserializers - Serdes 1.5Gbps 28-bit Coax/STP deserializr
• Manufacturer: Maxim Integrated
• Type: Deserializerr

Specifications of MAX9272GTM/V+

• Rohs: yes
• Data Rate: 1.5 Gbit/s
• Input Type: CML
• Output Type: CMOS/LVCMOS
• Number Of Inputs: 1
• Number Of Outputs: 28
• Operating Supply Voltage: 1.7 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: TQFN-48
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

Table 12. Staggered Output Delay
Table 13. Double-Function Configuration
The deserializer provides inputs for limited configura-
tion of the device when a FC is not connected. Connect
LCCEN = low upon power-up to disable the local control
channel and enable the double-function configuration
inputs
latched at power-up.
The control and configuration inputs, except three-level
inputs, include a pulldown resistor to GND. External pull-
down resistors are not needed.
The I
resistor to provide a logic-high level. There are tradeoffs
between power dissipation and speed, and a compromise
may be required when choosing pullup resistor values.
Every device connected to the bus introduces some
capacitance even when the device is not in operation. I
specifies 300ns rise times (30% to 70%) for fast mode,
which is defined for data rates up to 400kbps (see the I
specifications in the AC Electrical Characteristics table
for details). To meet the fast-mode rise-time requirement,
Maxim Integrated
LCCEN
High
Low
2
C and UART open-drain lines require a pullup
Local Control-Channel Enable (LCCEN)
(Table
28-Bit GMSL Deserializer for Coax or STP Cable
Choosing I
high = double input)
(low = single input,
Functions as GPIO
DOUT11–DOUT15, DOUT25, DOUT26
DOUT16–DOUT20, DOUT27, DOUT28
DOUT6–DOUT10, DOUT23, DOUT24
DOUT0–DOUT5, DOUT21, DOUT22
GPIO0/DBL
FUNCTION
13). All input configuration states are
DBL input
2
PCLKOUT
Internal Input Pulldowns
C/UART Pullup Resistors
OUTPUT
high = 32-bit mode)
(low = 24-bit mode,
Functions as GPIO
GPIO1/BWS
FUNCTION
BWS input
MS/HVEN FUNCTION
high = bypass mode)
2
2
encoding disabled,
encoding enabled)
(low = base mode,
C
C
high = HS/VS
(low = HS/VS
HVEN input
MS input
choose the pullup resistors so that rise time t
R
nized if the transition time becomes too slow. The deserial-
izer supports I
mode) and 400kbps (I
AC-coupling isolates the receiver from DC voltages up to
the voltage rating of the capacitor. Capacitors at the seri-
alizer output and at the deserializer input are needed for
proper link operation and to provide protection if either
end of the cable is shorted to a battery. AC-coupling
blocks low-frequency ground shifts and low-frequency
common-mode noise.
Voltage droop and the digital sum variation (DSV) of trans-
mitted symbols cause signal transitions to start from dif-
ferent voltage levels. Because the transition time is fixed,
starting the signal transition from different voltage levels
causes timing jitter. The time constant for an AC-coupled
link needs to be chosen to reduce droop and jitter to an
acceptable level. The RC network for an AC-coupled link
consists of the CML/coax receiver termination resistor
PULLUP
DISSTAG = 0
OUTPUT DELAY RELATIVE TO DOUT0 (ns)
x C
0.75
Selection of AC-Coupling Capacitors
0.5
1.5
0
1
BUS
2
detection/correction
detection/correction
C/UART rates up to 1Mbps (UART-to-I
UART/I
< 300ns. The waveforms are not recog-
RX/SDA/EDC
high = error
FUNCTION
(low = error
EDC input
disabled,
enabled)
output
2
C-to-I
2
C input/
2
C mode).
MAX9272
DISSTAG = 1
high = valid DOUT_
(low = valid DOUT_
on falling edge of
on rising edge of
UART/I
TX/SCL/ES
FUNCTION
PCLKOUT,
PCLKOUT)
AC-Coupling
0
0
0
0
0
ES input
output
2
C input/
R
= 0.85 x
2
38
C