MAX9242_07 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – 21-Bit Deserializers with Programmable Spread Spectrum and DC Balance

19-3954; Rev 2; 6/07
21-Bit Deserializers with Programmable
Spread Spectrum and DC Balance
General Description
The MAX9242/MAX9244/MAX9246/MAX9254 deserialize
three LVDS serial-data inputs into 21 single-ended LVC-
MOS/ LVTTL outputs. A separate parallel-rate LVDS clock
provides the timing for deserialization. The MAX9242/
MAX9244/MAX9246/MAX9254 feature spread-spectrum
capability, allowing the output data and clock frequency
to spread over a specified range to reduce EMI. The sin-
gle-ended data and clock outputs are programmable for
a frequency spread of ±2%, ±4%, or no spread. The
spread-spectrum function is also available when the
MAX9242/MAX9244/MAX9246/MAX9254 operate in non-
DC-balanced mode. The modulation rate of the spread is
32kHz for a 33MHz LVDS clock input and scales linearly
with frequency. The single-ended outputs have a sepa-
rate supply, allowing +1.8V to +5V output logic levels.
The MAX9254 features high output drive current for both
data and clock outputs for faster transition times in the
presence of heavy capacitive loads.
The MAX9242/MAX9244/MAX9246/MAX9254 feature pro-
gram-mable DC balance, allowing isolation between a
serializer and deserializer using AC-coupling. The
MAX9242/MAX9244/MAX9246/MAX9254 operate with the
MAX9209/MAX9213 serializers and are available with a
rising-edge strobe (MAX9242) or falling-edge strobe
(MAX9244/MAX9246/MAX9254). The LVDS inputs meet
ISO 10605 ESD specifications with ±30kV Air-Gap
Discharge and ±6kV Contact Discharge ratings.
Applications
Automotive Navigation Systems
Automotive DVD Entertainment Systems
Digital Copiers
Laser Printers
Selector Guide
PART
STROBE OVER-
EDGE SAMPLING
FREQUENCY RANGE
NON-DC
DC
BALANCE BALANCE
(MHz)
(MHz)
MAX9242 Rising
Yes
MAX9244 Falling
Yes
MAX9246 Falling
No
MAX9254 Falling
Yes
20 to 40
20 to 40
8 to 20
20 to 40
16 to 34
16 to 34
6 to 18
16 to 34
Features
♦ Programmable ±4%, ±2%, or OFF Spread-Spectrum
Output for Reduced EMI
♦ Programmable DC-Balanced or Non-DC-Balanced
Modes
♦ DC Balance Allows AC-Coupling for Wider Input
Common-Mode Voltage Range
♦ Spread Spectrum Operates in DC-Balanced or
Non-DC-Balanced Mode
♦ High Output Drive (MAX9254)
♦ π / 4 Deskew by Oversampling
(MAX9242/MAX9244/MAX9254)
♦ 16MHz-to-34MHz (DC-Balanced) and 20MHz-to-
40MHz (Non-DC-Balanced) Operation
(MAX9242/MAX9244/MAX9254)
♦ 6MHz-to-18MHz (DC-Balanced) and 8MHz-to-20MHz
(Non-DC-Balanced) Operation (MAX9246)
♦ Rising-Edge (MAX9242) or Falling-Edge
(MAX9244/MAX9246/MAX9254) Output Strobe
♦ High-Impedance Outputs when PWRDWN is Low
Allow Output Busing
♦ Separate Output Supply Allows Interface to +1.8V,
+2.5V, +3.3V, and +5V Logic
♦ LVDS Inputs Meet ISO 10605 ESD Protection at
±30kV Air-Gap Discharge and ±6kV Contact
Discharge
♦ LVDS Inputs Meet IEC 61000-4-2 Level 4 ESD
Protection at ±15kV Air-Gap Discharge and ±8kV
Contact Discharge
♦ LVDS Inputs Conform to ANSI TIA/EIA-644 Standard
♦ +3.3V Main Power Supply
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
PKG
CODE
MAX9242EUM -40°C to +85°C 48 TSSOP
U48-1
MAX9242GUM -40°C to +105°C 48 TSSOP
U48-1
MAX9244EUM -40°C to +85°C 48 TSSOP
U48-1
MAX9244GUM -40°C to +105°C 48 TSSOP
U48-1
MAX9246EUM -40°C to +85°C 48 TSSOP
U48-1
MAX9246GUM -40°C to +105°C 48 TSSOP
U48-1
MAX9254EUM -40°C to +85°C 48 TSSOP
U48-1
Devices are available in lead-free packaging. Specify lead free
by adding a + symbol at the end of the part number when
ordering.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.