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DS90C365A
+3.3V Programmable LVDS Transmitter 18-Bit Flat Panel
Display Link-85 MHz
General Description
The DS90C365A is a pin to pin compatible replacement for
DS90C363, DS90C363A and DS90C365. The DS90C365A
has additional features and improvements making it an ideal
replacement for DS90C363, DS90C363A and DS90C365.
family of LVDS Transmitters.
The DS90C365A transmitter converts 21 bits of LVCMOS/
LVTTL data into four LVDS (Low Voltage Differential Signal-
ing) data streams. A phase-locked transmit clock is transmit-
ted in parallel with the data streams over the fourth LVDS
link. Every cycle of the transmit clock 21 bits RGB of input
data are sampled and transmitted. At a transmit clock fre-
quency of 85 MHz, 21 bits of RGB data and 3 bits of LCD
timing and control data (FPLINE, FPFRAME, DRDY) are
transmitted at a rate of 595 Mbps per LVDS data channel.
Using a 85 MHz clock, the data throughput is 223.125
Mbytes/sec. This transmitter can be programmed for Rising
edge strobe or Falling edge strobe through a dedicated pin.
A Rising edge or Falling edge strobe transmitter will interop-
erate with a Falling edge strobe FPDLink Receiver without
any translation logic.
This chipset is an ideal means to solve EMI and cable size
problems associated with wide, high-speed TTL interfaces
with added Spead Spectrum Clocking support..
Features
n Pin-to-pin compatible to DS90C363, DS90C363A and
DS90C365 .
n No special start-up sequence required between
clock/data and /PD pins. Input signals (clock and data)
can be applied either before or after the device is
powered.
n Support Spread Spectrum Clocking up to 100kHz
frequency modulation & deviations of
±
2.5% center
spread or -5% down spread.
n “Input Clock Detection” feature will pull all LVDS pairs to
logic low when input clock is missing and when /PD pin
is logic high.
n 18 to 85 MHz shift clock support
n Tx power consumption
<
146 mW (typ)
@
85 MHz
Grayscale
n Tx Power-down mode
<
37 uW (typ)
n Supports VGA, SVGA, XGA, SXGA(dual pixel),
SXGA+(dual pixel), UXGA(dual pixel).
n Narrow bus reduces cable size and cost
n Up to 1.785 Gbps throughput
n Up to 223.125 Megabytes/sec bandwidth
n 345 mV (typ) swing LVDS devices for low EMI
n PLL requires no external components
n Compliant to TIA/EIA-644 LVDS standard
n Low profile 48-lead TSSOP package
Block Diagram
DS90C365A
20100539
Order Number DS90C365AMT
See NS Package Number MTD48
PRELIMINARY
October 2004
DS90C365A +3.3V Programmable LVDS Transmitter 18-bit Flat Panel Display (FPD) Link-85 MHz
© 2004 National Semiconductor Corporation DS201005 www.national.com
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