an1214

ISL24010EVAL2 User’s Manual
®
Application Note
November 11, 2005
Description
Using the ISL24010EVAL2 Board
The ISL24010EVAL2 is the evaluation board for the
ISL24010 Octal Level Shifter for TFT/LCD Panels. The part
was designed to level shift a digital input signal to +22V and
-5V for TFT-LCD displays. The device is capable of level
shifting a CMOS logic signal between +40V and -20V.
Applying Power to the Board
The ISL24010 will level shift a digital input signal (VIH = 1.8V,
VIL = 0.8V) to an output voltage nearly equal to its output
supply voltages. The ISL24010 has 3 supplies. VON1 and
VON2 are positive supplies with a voltage range between
+10V and +40V (absolute maximum). VOFF is the negative
supply with a voltage range between -5V and -20V (absolute
maximum). Outputs 1 through 6 are connected to VON1 and
VOFF. Outputs 7 and 8 are connected to VON2 and VOFF
(reference Figure 1). This configuration enables outputs 1
through 6 to provide slicing to the row drivers of a TFT/LCD
panel to reduce flicker, and outputs 7 and 8 to control
possible supply lines. VON2 should remain constant.
It is possible to tie VON1 and VON2 supplies together, if
independent control as described above is not desired.
VON2 is required to be greater than or equal to VON1 at all
times.
IN1
Connected to VON1
and VOFF
CH1
OUT1
CH2
OUT3
CH3
IN3
OUT4
CH4
IN4
OUT5
• Recommended power supply sequence: VON2, VON1,
VOFF then input logic signals.
Avoid hot plugging the supplies. The ESD protection scheme
of the ISL24010 is based on diodes from the pins to the
VON2 supply and a dV/dt- triggered clamp. This dV/dt
triggered clamp imposes a maximum supply turn-on slew rate
of 10V/µs. This clamp will trigger if the supply powers up too
fast, causing amps of current to flow. Capacitors C1 through
C3 and C12 through C17 help to slow up the supply ramp to
the part but may not be enough for hot plugging the supplies.
Operation of the Board
Operation of the board is simple. You provide a logic signal
on the input (VIH = 1.8V, VIL = 0.8V) and monitor the output
voltage which will swing nearly equal to the VON1/2 and
VOFF supplies.
ISL24010EVAL2 Picture
CH5
IN5
If voltage supplies VON1 and VON2 are different supplies,
then the supply sequence needs to be VON2 then VON1.
The reason for this requirement is shown in Circuit 4 in the
Pin Description Table. The ESD protection diode between
VON2 and VON1 will forward bias if VON1 becomes a diode
drop greater than VON2.
The schematic of the board is shown in Figure 3. The output
load provided is a parallel combination of 5kΩ and 100pF.
The board has provisions for including a series resistor for
analysis of various loads (R9 through R16). If different loads
are evaluated, the user needs to limit the output load less
than 10mA per channel because the ISL24010 has no
output short circuit current limit.
OUT2
IN2
AN1214.0
OUT6
CH6
IN6
IN7
Connected to VON2
and VOFF
CH7
CH8
OUT7
OUT8
IN8
FIGURE 1. ISL24010 FUNCTIONAL BLOCK DIAGRAM
FIGURE 2. ISL24010 EVAL BOARD
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1214
Pin Descriptions
PIN NUMBER
TSSOP-20
PIN NAME
EQUIVALENT
CIRCUIT
1
GND
4
Ground pin
2
IN1
1
Level shifter input 1
3
IN2
1
Level shifter input 2
4
IN3
1
Level shifter input 3
5
IN4
1
Level shifter input 4
6
IN5
1
Level shifter input 5
7
IN6
1
Level shifter input 6
8
IN7
1
Level shifter input 7
9
IN8
1
Level shifter input 8
10
VOFF
4
Negative output supply for all channels
11
VON2
4
Positive output supply for channels 7 and 8. VON2 is required to be greater than or equal to
VON1.
12
OUT8
3
Lever shifter output 8
13
OUT7
3
Lever shifter output 7
14
OUT6
2
Lever shifter output 6
15
OUT5
2
Lever shifter output 5
16
OUT4
2
Lever shifter output 4
17
OUT3
2
Lever shifter output 3
18
OUT2
2
Lever shifter output 2
19
OUT1
2
Lever shifter output 1
20
VON1
4
Positive output supply for channels 1 through 6. VON1 is required to be less than or equal to
VON2.
DESCRIPTION
VON2
IN
VOFF
Outputs 1-6
CIRCUIT 1.
VON1
VON2
OUT
OUT
VOFF
Outputs 7-8
CIRCUIT 2.
VOFF
CIRCUIT 3.
VON2
VON1
ESD CLAMP
GND
VOFF
CIRCUIT 4.
2
AN1214.0
November 11, 2005
ISL24010EVAL2 Schematic
VOFF
VON1
J9
C1 1µF
J10
J11
C2 1µF
C3 1µF
C16
C15
0.1µF
J1
VON2
C13 1µF
3
J2
J12
C17
0.1µF
0.1µF
IN1
GND
C14 1µF
J14
R10 0Ω
C12 1µF
IN2
J13
OUT1
R9 0Ω
OUT2
J15
R11 0Ω
J5
IN5
J6
IN6
VON2
VOFF
J4
IN4
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
OUT8
OUT3
19
18
17
16
15
14
13
12
J16
R12 0Ω
OUT4
R13 0Ω
J17
OUT5
J18
R14 0Ω
OUT6
GND
J7
1
J19
R15 0Ω
OUT7
IN7
J20
R16 0Ω
J8
OUT8
IN8
R1
50Ω
R2
50Ω
R3
50Ω
R4
50Ω
R5
50Ω
R6
50Ω
R7
50Ω
C4
100pF
C8
100pF
R17
5kΩ
R21
5kΩ
R8
50Ω
C5
100pF
C9
100pF
R18
5kΩ
C6
100pF
C10
100pF
R19
5kΩ
C7
100pF
AN1214.0
November 11, 2005
FIGURE 3. EVAL BOARD SCHEMATIC
R22
5kΩ
R20
5kΩ
R23
5kΩ
C11
100pF
R24
5kΩ
Application Note 1214
2
3
4
5
6
7
8
9
VON1
J3
IN3
Application Note 1214
ISL24010EVAL2 Bill of Materials
TABLE 1. ISL24010EVAL2 BOM
PART NUMBER
REF. DES.
QTY.
VALUE
TOL.
DESCRIPTION
ISL24010EVAL2REVAPCB
PCB
1
PWB-PCB, ISL24010EVAL2, REVA
H1046-00101-50V10-T
C4-C11
8
100pF,
50V
10%
Capacitor, SMD, 0805, NPO
H1046-00104-50V10-T
C15-C17
3
0.1µF,
50V
10%
Capacitor, SMD, 0805, X7R
H1065-00105-25V10-T
C1-C3, C12-C14
5
1.0µF
10%
Capacitor, SMD, 1206
108-0740-001
J9-J12
4
Conn-Jack, Bana-SS-Sdrless, Vertical
31-5329-52RFX
J1-J8, J13-J20
16
Conn-BNC, Female, 50Ω, 4 Post Vertical PC Mount
ISL24010IVZ
U1
1
IC-Octal Level Shifter, 20P, TSSOP, Pb-free
CRCW251249R9FKEG
R1-R8
8
49.9Ω,
1W,
H2512-00R00-1/10W-T
R9-R16
8
0Ω,
1/10W,
H2512-04991-1/10W1-T
R17-R24
8
4.99kΩ,
1/10W
4-40X1-STANDOFF-METAL
Four corners
4
Standoff, 4-40X1
4-40X1/2-SCREW-SS
Four corners
4
Screw, 4-40X1/2in, PAN, SS, Philip
1%
Resistor, SMD, 2512, TF, Pb-free
Resistor, SMD, 0805, TF
1%
Resistor, SMD, 0805, TF
NOTE: Decoupling capacitors C12 through C14 only need to be 0.1µF. The capacitors provided on the board are 1.0µF to insure robustness of the
eval board.
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to
verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
4
AN1214.0
November 11, 2005
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