DS90C383/DS90CF384
+3.3V Programmable LVDS Transmitter 24-Bit Flat Panel
Display (FPD) Link—65 MHz, +3.3V LVDS Receiver
24-Bit Flat Panel Display (FPD) Link—65 MHz
General Description
The DS90C383 transmitter converts 28 bits of CMOS/TTL
data into four LVDS (Low Voltage Differential Signaling) data
streams. A phase-locked transmit clock is transmitted in par-
allel with the data streams over a fifth LVDS link. Every cycle
of the transmit clock 28 bits of input data are sampled and
transmitted. The DS90CF384 receiver converts the LVDS
data streams back into 28 bits of CMOS/TTL data. At a trans-
mit clock frequency of 65 MHz, 24 bits of RGB data and 3
bits of LCD timing and control data (FPLINE, FPFRAME,
DRDY) are transmitted at a rate of 455 Mbps per LVDS data
channel. Using a 65 MHz clock, the data throughputs is 227
Mbytes/sec. The transmitter is offered with programmable
edge data strobes for convenient interface with a variety of
graphics controllers. The transmitter can be programmed for
Rising edge strobe or Falling edge strobe through a dedi-
cated pin. A Rising edge transmitter will inter-operate with a
Falling edge receiver (DS90CF384) without any translation
logic. The DS90CF384 is also offered in 64 ball, 0.8mm fine
pitch ball grid array(FBGA) package which provides a 44
%
reduction in PCB footprint (available Q3, 1999).
This chipset is an ideal means to solve EMI and cable size
problems associated with wide, high speed TTL interfaces.
Features
n 20 to 65 MHz shift clock support
n Programmable transmitter (DS90C383) strobe select
(Rising or Falling edge strobe)
n Single 3.3V supply
n Chipset (Tx + Rx) power consumption
<
250 mW (typ)
n Power-down mode (
<
0.5 mW total)
n Single pixel per clock XGA (1024x768) ready
n Supports VGA, SVGA, XGA and higher addressability.
n Up to 227 Megabytes/sec bandwidth
n Up to 1.8 Gbps throughput
n Narrow bus reduces cable size and cost
n 290 mV swing LVDS devices for low EMI
n PLL requires no external components
n Low profile 56-lead TSSOP package.
n DS90CF384 also available in 64 ball, 0.8mm fine pitch
ball grid array(FBGA) package
n Falling edge data strobe Receiver
n Compatible with TIA/EIA-644 LVDS standard
n ESD rating
>
7kV
n Operating Temperature: −40˚C to +85˚C
Block Diagrams
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
Application
DS012887-2
September 1999
DS90C383/DS90CF384 +3.3V Programmable LVDS 24-Bit-Color Flat Panel Display (FPD)
Link— 65 MHz
© 1999 National Semiconductor Corporation DS012887 www.national.com
