SM16706P/SP/F/FN
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
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.
PIN ASSIGNMENTS
GENERAL DESCRIPTION
FEATURES
Page 1
* 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
Current
Matching
Output Current
0.7V
6.0%
5 ~ 90mA
0.4V
6.0%
5 ~ 40mA
V.2.0 MAY,2003
SM16706
24
21
22
23
1
4
3
2
GND
LATCH
CLOCK
SERIAL-IN
V
DD
ENABLE
SERIAL-OUT
R-EXT
SM16706F
24pin SOP
SM16706SP
24pin SDIP
SM16706FN
24pin SSOP
17
18
19
20
8
7
6
5
OUT3
OUT2
OUT1
OUT0
OUT12
OUT13
OUT14
OUT15
13
14
15
16
12
11
10
9
OUT7
OUT6
OUT5
OUT4
OUT8
OUT9
OUT10
OUT11
SM16706P
24pin SKINY DIP
Part Number
Package Type
Page 2
V.2.0 MAY,2003
PIN DESCRIPTION
SM16706P/SP/F/FN
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
3
I
Input terminal of a clock for shift register on rising edge.
1
GND terminal
2
I
Terminal of serial-data input to the shift register.
Pin NO.
I / O
Function Description
4
I
Input terminal of data strobe. Latches pass data with
"H" level input of LATCH-terminal, and hold data with
"L" level input.
5 ~ 20
O
Constant Current-sinking output terminals.
24
5V supply voltage terminal.
23
I / O
An external resistor at this terminal establishes all of the
output current.
22
O
Output terminal of serial-data for next SERIAL-IN terminal.
21
I
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.
CLOCK
GND
SERIAL-IN
Pin Name
LATCH
OUT0 ~ 15
V
DD
R-EXT
SERIAL-OUT
ENABLE
TRUTH TABLE
EQUIVALENT CIRCUIT OF INPUTS AND OUTPUTS
Page 3
D
n
... D
n - 7
... D
n - 15
No change
D
n
D
n + 1
D
n - 15
D
n
- 14
UP
UP
H
L
L
L
D
n + 2
... D
n
- 5
... D
n - 13
D
n + 2
D
n - 13
UP
H
L
D
n + 2
... D
n
- 5
... D
n
- 13
D
n + 3
D
n - 13
DOWN
X
L
Off
D
n + 3
D
n - 13
DOWN
X
H
V
DD
ENABLE
GND
R
IN
(Up)
V
DD
LATCH
GND
R
IN
(Down)
1. ENABLE terminal
2. LATCH terminal
3. CLOCK, SERIAL-IN terminal
4. SERIAL-OUT terminal
SM16706P/SP/F/FN
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
V.2.0 MAY,2003
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.
V
DD
CLOCK,
SERIAL-IN
GND
V
DD
GND
SERIAL-OUT
OUT0 ... OUT7 ... OUT15
SERIAL-IN
SERIAL-OUT
CLOCK
LATCH
ENABLE
BLOCK DIAGRAM
TIMING DIAGRAM
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.
SM16706P/SP/F/FN
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
V.2.0 MAY,2003
Page 4
R-EXT
ENABLE
LATCH
SERIAL-IN
CLOCK
SERIAL-
OUT
I-REG.
OUT0
OUT1
OUT15
Q
ST D
Q
ST D
Q
ST D
D Q
CK
D Q
CK
D Q
CK
CLOCK
SERIAL-IN
LATCH
ENABLE
OUT0
OUT1
OUT2
OUT15
SERIAL-OUT
0V
5V
0V
0V
5V
0V
5V
Off
On
Off
5V
Off
Off
On
0V
5V
.....
On
On
MAXIMUM RATINGS (Ta = 25
o
C)
Page 5
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
(Note)
RECOMMENDED OPERATING CONDITION (Ta = - 40 ~ 85
o
C unless otherwise noted)
SM16706P/SP/F/FN
SAMHOP Microelectronics Corp.
16-BIT CONSTANT CURRENT LED DRIVER
V2.0 MAY,2003
P
D
V
DD
V
IN
I
OUT
V
OUT
f
CLK
I
GND
Topr
Tstg
Rth (j-a)
Supply Voltage
Input Voltage
Output Current
Output Voltage
Clock Frequency
GND Terminal Current
Operating Termerature
Storage Temperature
Thermal Resistance
Power Dissipation
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)
-40 ~ 85
-55 ~ 150
70 (DIP : FREE AIR, Ta = 25
o
C)
120 (SOP/ SSOP : ON PCB, Ta = 25
o
C)
V
V
mA
V
MHz
mA
W
o
C / W
o
C
o
C
Symbol
Characteristic
Rating
Unit
V
Output Current
Supply Voltage
Output Voltage
mA
V
V
5
4.5
5.0
88
1.0
5.5
15.0
OUTn,DC test circuit
SERIAL-OUT
I
O
I
OH
V
DD
V
OUT
-1.0
SERIAL-OUT
I
OL
Input Voltage
V
DD
= 4.5 ~ 5.5V
0.7
V
DD
V
DD
+0.3
V
IH
LATCH Pulse Width
CLOCK Pulse Width
ns
ns
20
20
tw LAT
tw CLK
ns
-500
tw EN
ENABLE Pulse Width
Hold Time for DATA
Set-up Time for LATCH
ns
ns
20
20
t
hold
(D)
t
setup
(L)
ns
20
t
setup
(D)
Set-up Time for DATA
Characteristic
Unit
Min.
Typ. Max.
Condition
Symbol
-0.3
0.3
V
DD
V
IL
W
0.50
Ta = 85
o
C
(SOP/ SSOP ON PCB)
MHz
25
Clock Frequency
Cascade operation
f
CLK
Power Dissipation
P
D
Ta = 85
o
C(DIP FREE AIR)
0.92
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