BLOCK DIAGRAM
GENERAL DESCRIPTION
FEATURES
CS5824
28:4 LVDS Transmitter
USA:
4020 Moorpark Avenue Suite 115
San Jose, CA, 95117
Tel: 408-243-8388 Fax: 408-243-3188
Sales@myson.com.tw
www.myson.com.tw
Rev.1.4 August 2002
page 1 of 13
Myson Century, Inc.
Taiwan:
No. 2, Industry East Rd. III,
Science-Based Industrial Park, Hsin-Chu, Taiwan
Tel: 886-3-5784866 Fax: 886-3-5784349
Four 7-bit serial and one clock LVDS channels.
Compatible with ANSI TIA/EIA-644 LVDS
standard.
Wide CKIN ranges from 31MHz to 68MHz.
Fully integrated on-chip PLL that provides 7X
CKIN serial shift clock.
Pin selectable for rising or falling edge trigger.
Support power-down mode.
5V/3.3V tolerant data input.
Single 3.3V supply operation.
CMOS low power consumption.
Functional compatible with DS90C385.
Available in 56-pin TSSOP package.
PARALLEL-IN SERIAL-OUT
7-Bit SHIFT REGISTER
PARALLEL-IN SERIAL-OUT
7-Bit SHIFT REGISTER
PARALLEL-IN SERIAL-OUT
7-Bit SHIFT REGISTER
SHIFT/LOAD_N
DIN
CLK
PHASE LOCK LOOP
R/F
CLK
7xCLK
SHIFT/LOAD_N
CONTROL LOGIC
D19,D20,D21,D22,
D27,D5,D10,D11,
RF
CKIN
SHTDN
EN
CKOP
CKON
CS5824
DIN
CLK
DIN
CLK
SHIFT/LOAD_N
SHIFT/LOAD_N
EN
Y3P
Y3N
EN
Y2P
Y2N
EN
Y1P
Y1N
EN
Y0P
Y0N
PARALLEL-IN SERIAL-OUT
7-Bit SHIFT REGISTER
DIN
CLK
SHIFT/LOAD_N
D0,D1,D2,D3,
D4,D6,D7
D8,D9,D12,D13,
D14,D15,D18
D24,D25,D26
D16,D17,D23
The CS5824 receives four sets of 7-bit data in
CMOS logic level and converts them into four low-
voltage differential signaling (LVDS) serial channels.
The 7-bit input data is referenced to the CKIN signal.
The RF pin selects either rising or falling edge trigger
of CKIN. Parallel to serial conversion is performed by
a 7X internal generated clock reference using on-
chip PLL using CKIN. A copy of CKIN but phase-
locked to the output serial streams, CLKOUT, is also
converted to the fifth LVDS channel. The CS5824
offers a reliable communication media using LVDS
signaling and provides low EMI dealing with wide,
high-speed TTL interfaces.
This is especially attractive for interfaces between
GUI controller and display systems such as LCD
panels for SVGA/XGA/SXGA applications.
CS5824
page 3 of 13
PIN DESCRIPTION
Name
I/O
Description
D0,D1,D2,D3,D4,
D6,D7
I
Parallel data input for Y0 LVDS channel. D[0] is LSB and D[7] is MSB. MSB is shifted out
first.
D8,D9,D12,D13,
D14,D15,D18
I
Parallel data input for Y1 LVDS channel. D[8] is LSB and D[18] is MSB.
D19,D20,D21,D22
,D24,D25,D26
I
Parallel data input for Y2 LVDS channel. D[19] is LSB and D[26] is MSB.
D27,D5,D10,D11,
D16,D17,D23
I
Parallel data input for Y3 LVDS channel. D[27] is LSB and D[23] is MSB.
CKIN
I
Parallel input clock.This clock signal is used for parallel data reference. It is also used by
the on-chip PLL to generate the 7X shift clock for parallel to serial conversion.
RF
I
Rise/fall select. This pin selects the polarity of the CKIN edge for data input. RF = 1
selects CKIN rise edge, and RF = 0 selects CKIN fall edge.
SHTDN
I
Shutdown control (low active). When SHTDN is low, the internal PLL is put into inhibit
mode and all LVDS output channels are shut off. This also resets all internal registers.
For normal operation, SHTDN should be set to high.
Y0P, Y0N
O
Y0 LVDS channel output. These are differential LVDS outputs for Y0 channel
corresponds to D0, D1, D2, D3, D4, D6, D7.
Y1P, Y1N
O
Y1 LVDS channel output. These are differential LVDS outputs for Y1 channel
corresponds to D8, D9, D12, D13, D14, D15, D18.
Y2P, Y2N
O
Y2 LVDS channel output. These are differential LVDS outputs for Y2 channel
corresponds to D19, D20, D21,D22, D24, D25, D26.
Y3P, Y3N
O
Y3 LVDS channel output. These are differential LVDS outputs for Y3 channel
corresponds to D27, D5, D10, D11, D16, D17, D23.
CKOP, CKON
O
Clock LVDS channel output. These are differential LVDS output for the replica of CKIN
signal. CKOP and CKON are derived from the internal phase lock loop and phase
aligned with the serial data output and can be used by the LVDS receiver for reference
edge.
PLL_VDD
P
Power supply for PLL circuit.
PLL_VSS
P
Power ground for PLL circuit.
LVDS_VDD
P
Power supply for output buffer circuits.
LVDS_VSS
P
Power ground for output buffer circuits.
VDD
P
Power supply for internal circuits.
VSS
P
Power ground for internal circuits.
CS5824
page 4 of 13
FUNCTIONAL DESCRIPTION
Control logic
There are two modes in this circuit. One is normal mode, and another is power down mode. Two modes are
controlled by the control signal "SHTDN". If SHTDN is high, the circuit is in the normal mode, else if low, the
circuit is in the power down mode. In the power down mode, every block is off to make sure the least power
consumption.
7 x CLK PLL
7 x CLK PLL, which is a phase lock loop, generates seven times clock of CKIN. The signal "RF" indicates that the
input data (D0 ~ D27) is rising edge or falling edge trigger by CKIN. If RF=1, it is rising edge trigger, else if RF=0,
it is falling trigger. This seven times clock of CKIN is used by the Parallel ~ LOAD 7 Bit shift Register. 7 x CLK PLL
also generate the control signal "SHIFT/LOAD". This signal is also used by the Parallel ~ LOAD 7 Bit Shift
Register to indicate when to load data or shift data.
Parallel ~ LOAD 7 Bit shift Register
This block transfers 7 bits parallel data into one bit series data out. It is controlled by SHIFT/LOAD. If this control
signal is low, the data are loaded into shift registers. Next, the SHIFT/LOAD turns high to shift data from shift
register to output buffer seven times. One load and then seven shift.
Ref:
There are two properties in this block. One is that it supports reference voltage to fine the output's common mode
voltage. Another is that it generates about (4ns ~6ns) pulse width's power on reset signal. When power on, all
block would be reset by power on reset signal to make sure that the circuit would not stuck-at some situation we
do not care.
Output buffer
There are four data output buffers and one clock output buffer. Output buffer generates differential pair output
that swing is under 500 ~ 900mV, and common-mode voltage is under 1.125V ~ 1.375V.
CS5824
page 5 of 13
RECOMMENDED OPERATING CONDITIONS
TIMING REQUIREMENTS
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply voltage
3
3.3
3.6
V
V
IH
High-level input voltage
2
-
-
V
V
IL
Low-level input voltage
-
-
0.8
V
Z
L
Differential load impedance
90
-
132
T
A
Operating free-air temperature
0
-
70
C
Symbol
Parameter
Min
Typ
Max
Unit
t
C
Input clock period
14.7
32.4
ns
t
W
Pulse duration, high-level input clock
0.4t
C
0.6t
C
ns
t
t
Transition time, Input signal
5
ns
t
su
Setup time, data, D0~D27 valid before CKIN
(RF = 0)
or CKIN
(RF = 1)
3
ns
t
h
Hold time, data, D0~D27 valid after CKIN
(RF = 0) or
CKIN
(RF = 1)
1.5
ns
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