Marktech TB62708N Datasheet
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TB62708N
16 Bit Constant Current LED Source Driver with Shift Register and Latch Functions
Product Description:
The TB62708N is specifically designed for LED display applications. The Bi-CMOS device has
16 Bi-polar constant current output source channels and includes CMOS shift register and latch
functions.
The LED drive current is programmed by the
installation of a single resistor per device.
Current is programmable from 5-90mA and is
held constant across all 16 source outputs
effectively compensating for the inherent
circuit and component variables which affect
the brightness of the LEDs.
Features:
• Current Source Device
• 16 Constant Current Output Channels
• Current Programmable from 5-90mA
• 5V CMOS Compatible Inputs
• 15MHz Max Clock Frequency (Cascade)
TB62708N
SDIP30-P-400
Block Diagram:
marktech
optoelectronics
For up-to-date product info visit our web site at www.marktechopto.com All specifications subject to change.
Toll Free: (800) 98-4LEDS
120 Broadway • Menands, New York 12204
• Fax: (518) 432-7454
575
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A Bi-CMOSA Bi-CMOS
A Bi-CMOS
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TB62708NTB62708N
TB62708N
TB62708NTB62708N
Timing Diagram:
Latches are:
1. Level Sesitive
2. Not edge sensitive
3. Not clock synchronous
4. Passing Data when LATCH is H
5. Hold Data when LATCH is L
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All Outputs are OFF when ENABLE is H and ON when ENABLE is L.
Terminal Description & Pin Out:
PIN No. PIN NAME FUNCTION
1 GND GND termi nal
2 SERIAL-IN Seri al Data Input terminal
3 CLOCK Clock Input terminal
4 LATCH Latch Input Terminal
6~9,11~14,
17~20,22~25
27 ENABLE Output Enable Input Terminal
28 SERIAL-OU T Seri al Data Out Terminal
29 R-EXT Constant Current Programming
30 VDD 5V Supply voltage terminal
10,15,16,21 VLED 0~17V Supply voltage terminal for LED
For up-to-date product info visit our web site at www.marktechopto.com All specifications subject to change.
576
OUT0~15 Output terminals
marktech
optoelectronics
120 Broadway • Menands, New York 12204
Toll Free: (800) 98-4LEDS
• Fax: (518) 432-7454
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A Bi-CMOSA Bi-CMOS
A Bi-CMOS
A Bi-CMOSA Bi-CMOS
Constant CurConstant Cur
Constant Cur
Constant CurConstant Cur
TB62708NTB62708N
TB62708N
TB62708NTB62708N
Truth Table:
CLOCK LATCH ENABLE SERIAL-IN OUT0 OUT7 OUT15 SERIAL-OUT2
UP H L Dn Dn Dn-7 Dn-15 Dn-16
DOWN H L Dn Dn Dn-7 Dn-15 Dn-15
UP L L Dn+1 No Change (data hold) No Change
DOWN L L Dn+1 No Change (data hold) Dn-14
No Edge H L Dn+1 Dn +1 Dn-6 Dn-14 No Change
No Edge X H Dn+1 Off No Change
Equivalent Circuit of Inputs and Outputs:
Maximum Ratings:
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CHARACTER SYMBOL RATING UNIT
Supply Voltage VDD +7.0 V
Supply Voltage for LED VCC +17.0 V
Output Voltage VCE -0.4~+17.0 V
Output Current IOUT -90 mA
Input Voltage VIN -0.4~VDD + 0.4 V
GND Terminal Current IGND 1440 mA
Clock Frequency FCLK 15 MHz
Power Dissipation PD
Operating Temperature Topr -40~+85 °C
Storage Temperature Tstg -55~+150 °C
marktech
optoelectronics
For up-to-date product info visit our web site at www.marktechopto.com All specifications subject to change.
2.08 (ON PCB,Ta=25°C)
1.56 (FREE AIR, Ta=25°C)
120 Broadway • Menands, New York 12204
Toll Free: (800) 98-4LEDS
W
• Fax: (518) 432-7454
577
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