MAX9242 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – 21-Bit Deserializers with Programmable Spread Spectrum and DC Balance

19-3954; Rev 0; 1/06
21-Bit Deserializers with Programmable
Spread Spectrum and DC Balance
General Description
The MAX9242/MAX9244/MAX9246 deserialize three
LVDS serial-data inputs into 21 single-ended LVCMOS/
LVTTL outputs. A separate parallel-rate LVDS clock pro-
vides the timing for deserialization. The MAX9242/
MAX9244/MAX9246 feature spread-spectrum capability,
allowing the output data and clock frequency to spread
over a specified range to reduce EMI. The single-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 operate in non-DC-balanced mode. The modu-
lation rate of the spread is 32kHz for a 33MHz LVDS clock
input and scales linearly with frequency. The single-
ended outputs have a separate supply, allowing +1.8V to
+5V output logic levels.
The MAX9242/MAX9244/MAX9246 feature program-
mable DC balance, allowing isolation between a serial-
izer and deserializer using AC-coupling. The MAX9242/
MAX9244/MAX9246 operate with the MAX9209/
MAX9213 serializers and are available with a rising-
edge strobe (MAX9242) or falling-edge strobe
(MAX9244/MAX9246). The LVDS inputs meet ISO
10605 ESD specifications with ±30kV Air-Gap
Discharge and ±6kV Contact Discharge ratings.
The MAX9242/MAX9244/MAX9246 are available in a
48-pin TSSOP package and operate over the -40°C to
+85°C temperature range.
Applications
Automotive Navigation Systems
Automotive DVD Entertainment Systems
Digital Copiers
Laser Printers
Selector Guide
FREQUENCY RANGE
PART
STROBE OVER-
NON-DC
DC
EDGE SAMPLING _{BALANCE BALANCE}
(MHz)
(MHz)
MAX9242 Rising
Yes
20 to 40 16 to 34
MAX9244 Falling
Yes
20 to 40 16 to 34
MAX9246 Falling
No
8 to 20
6 to 18
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
♦ π / 4 Deskew by Oversampling (MAX9242/MAX9244)
♦ 16MHz-to-34MHz (DC-Balanced) and 20MHz-to-
40MHz (Non-DC-Balanced) Operation
(MAX9242/MAX9244)
♦ 6MHz-to-18MHz (DC-Balanced) and 8MHz-to-20MHz
(Non-DC-Balanced) Operation (MAX9246)
♦ Rising-Edge (MAX9242) or Falling-Edge
(MAX9244/MAX9246) Output Strobe
♦ High-Impedance Outputs when PWRDWN is Low
Allow Output Busing
♦ Fail-Safe Inputs in Non-DC-Balanced Mode
♦ 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
MAX9244EUM -40°C to +85°C 48 TSSOP
U48-1
MAX9246EUM -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.
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