SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
SM16706P/SP/F/FN
GENERAL DESCRIPTION
The SM16706P/SP/F/FN are specifically designed
for LED display constant current drivers.
This constant current output circuits is able to setup
by external resistor (I
OUT
= 5 ~ 90mA).
This IC is monolithic integrated circuit designed to be
used together with Bi-CMOS process.
The devices consist of 16bit shift register, latch,
AND-GATE and Constant Current Drivers.
FEATURES
* Constant Current Output :
can setup all output current with one resistor
for 5 to 90mA.
* Maximum Clock Frequency :
f
CLK
= 25 (MHz)
(Cascade Connect Operate,
Topr = 25
o
C)
* 5V CMOS Compatible Input
* 24 pin SKINY DIP,SDIP, SOP or SSOP package
* Constant Output Current Matching :
Output-GND
Voltage
≧
0.4V
≧
0.7V
Current
Matching
±
6.0%
±
6.0%
Output Current
5 ~ 40mA
5 ~ 90mA
PIN ASSIGNMENTS
GND
SERIAL-IN
CLOCK
LATCH
OUT0
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
OUT7
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
DD
R-EXT
SERIAL-OUT
ENABLE
OUT15
OUT14
OUT13
OUT12
OUT11
OUT10
OUT9
OUT8
Part Number
SM16706P
SM16706SP
SM16706F
SM16706FN
Package Type
24pin SKINY DIP
24pin SDIP
24pin SOP
24pin SSOP
SM16706
Page 1
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
SM16706P/SP/F/FN
PIN DESCRIPTION
Pin NO.
I/O
Pin Name
Function Description
1
2
3
I
I
GND
SERIAL-IN
CLOCK
GND terminal
Terminal of serial-data input to the shift register.
Input terminal of a clock for shift register on rising edge.
Input terminal of data strobe. Latches pass data with
"H" level input of LATCH-terminal, and hold data with
"L" level input.
Constant Current-sinking output terminals.
Input terminal of output enable. All outputs (OUT0~15) do
off with "H" level input of ENABLE-terminal and do on
with "L" level input.
Output terminal of serial-data for next SERIAL-IN terminal.
An external resistor at this terminal establishes all of the
output current.
5V supply voltage terminal.
4
I
LATCH
5 ~ 20
O
OUT0 ~ 15
21
I
ENABLE
22
23
24
O
I/O
SERIAL-OUT
R-EXT
V
DD
Page 2
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
SM16706P/SP/F/FN
TRUTH TABLE
CLOCK
UP
UP
UP
DOWN
DOWN
LATCH
H
L
H
X
X
ENABLE
L
L
L
L
H
SERIAL-IN
D
n
D
n + 1
D
n + 2
D
n + 3
D
n + 3
OUT0
…
OUT7
…
OUT15
D
n
…
D
n - 7
…
D
n - 15
No change
D
n + 2
…
D
n - 5
…
D
n - 13
D
n + 2
…
D
n - 5
…
D
n - 13
Off
SERIAL-OUT
D
n - 15
D
n - 14
D
n - 13
D
n - 13
D
n - 13
Note : 1.OUT0~15=on when Dn="H" ; OUT0~15=off when Dn="L".
2. In order to ensure that the level of the power supply voltage is correct, an external resistor
must be connected betwen R-EXT and GND.
EQUIVALENT CIRCUIT OF INPUTS AND OUTPUTS
1. ENABLE terminal
V
DD
R
IN
(Up)
2. LATCH terminal
V
DD
ENABLE
LATCH
R
IN
(Down)
GND
GND
3. CLOCK, SERIAL-IN terminal
V
DD
CLOCK,
SERIAL-IN
GND
4. SERIAL-OUT terminal
V
DD
SERIAL-OUT
GND
Page 3
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
SM16706P/SP/F/FN
BLOCK DIAGRAM
OUT0
R-EXT
I-REG.
OUT1
OUT15
ENABLE
Q
ST D
Q
ST D
Q
ST D
LATCH
SERIAL-IN
CLOCK
D Q
CK
D Q
CK
D Q
CK
SERIAL-
OUT
TIMING DIAGRAM
CLOCK
SERIAL-IN
LATCH
ENABLE
OUT0
OUT1
OUT2
OUT15
SERIAL-OUT
.....
5V
0V
5V
0V
5V
0V
5V
0V
On
Off
On
Off
On
Off
On
Off
5V
0V
Note : Latches are level sensitive, not rising edges sensitive and not synchronous CLOCK.
Input of LATCH-terminal to H Level, data passes latches, and input of LATCH -terminal to L level, data
hold latches.
Page 4
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
MAXIMUM RATINGS (Ta = 25
o
C)
Characteristic
Supply Voltage
Input Voltage
Output Current
Output Voltage
Clock Frequency
GND Terminal Current
Power Dissipation
Thermal Resistance
Operating Termerature
Storage Temperature
(Note)
Symbol
V
DD
V
IN
I
OUT
V
OUT
f
CLK
I
GND
P
D
Rth (j-a)
Topr
Tstg
SM16706P/SP/F/FN
Rating
0 ~ 7.0
- 0.4 ~ VDD +0.4
90
- 0.5 ~ 20.0
25
1440
1.78 (DIP : FREE AIR, Ta = 25
o
C)
1.00 (SOP/ SSOP : ON PCB, Ta = 25
o
C)
70 (DIP : FREE AIR, Ta = 25
o
C)
120 (SOP/ SSOP : ON PCB, Ta = 25
o
C)
-40 ~ 85
-55 ~ 150
Unit
V
V
mA
V
MHz
mA
W
o
C
o
/W
C
o
C
DIP : Ambient temperature derated above 25
o
C in the proportion of 14.2mW /
o
C
SOP/ SSOP: Ambient temperature delated above 25
o
C in the proportion of 8.3mW /
o
C
RECOMMENDED OPERATING CONDITION (Ta = - 40 ~ 85
o
C unless otherwise noted)
Characteristic
Supply Voltage
Output Voltage
Output Current
Symbol
V
DD
V
OUT
I
O
I
OH
I
OL
V
IH
Input Voltage
V
IL
LATCH Pulse Width
CLOCK Pulse Width
ENABLE Pulse Width
Set-up Time for DATA
Hold Time for DATA
Set-up Time for LATCH
Clock Frequency
Power Dissipation
tw LAT
tw CLK
tw EN
t
setup
(D)
t
hold
(D)
t
setup
(L)
f
CLK
P
D
－
Condition
－
－
OUTn,DC test circuit
SERIAL-OUT
SERIAL-OUT
－
Min.
4.5
－
5
－
－
0.7
V
DD
-0.3
20
20
-500
20
20
20
－
－
－
Typ.
5.0
－
－
－
－
－
－
－
－
－
－
－
－
－
－
－
Max.
5.5
15.0
88
1.0
-1.0
V
DD
+0.3
0.3
V
DD
－
－
－
－
－
－
25
0.92
0.50
Unit
V
V
mA
V
ns
ns
ns
ns
ns
ns
MHz
W
V
DD
= 4.5 ~ 5.5V
Cascade operation
Ta = 85
o
C(DIP FREE AIR)
Ta = 85
o
C
(SOP/ SSOP ON PCB)
Page 5
V2.0 MAY,2003
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