SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
GENERAL DESCRIPTION
FEATURES
The SM16706P/SP/F/FN are specifically designed
for LED display constant current drivers.
* Constant Current Output :
can setup all output current with one resistor
for 5 to 90mA.
* Maximum Clock Frequency :
fCLK = 25 (MHz)
(Cascade Connect Operate,
Topr = 25oC)
* 5V CMOS Compatible Input
* 24 pin SKINY DIP,SDIP, SOP or SSOP package
* Constant Output Current Matching :
This constant current output circuits is able to setup
by external resistor (IOUT = 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.
Output-GND
Voltage
Current
Matching
Output Current
≧0.4V
± 6.0%
5 ~ 40mA
≧0.7V
± 6.0%
5 ~ 90mA
PIN ASSIGNMENTS
GND
1
24
VDD
SERIAL-IN
2
23
R-EXT
CLOCK
3
22
SERIAL-OUT
LATCH
4
21
ENABLE
OUT0
5
20
OUT15
OUT1
6
19
OUT14
OUT2
7
18
OUT13
OUT3
8
17
OUT12
OUT4
9
16
OUT11
OUT5
10
15
OUT10
OUT6
11
14
OUT9
OUT7
12
13
OUT8
Part Number
Package Type
SM16706P
24pin SKINY DIP
SM16706SP
24pin SDIP
SM16706F
24pin SOP
SM16706FN
24pin SSOP
SM16706
Page 1
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
PIN DESCRIPTION
Pin NO.
I/O
1
Pin Name
GND
Function Description
GND terminal
2
I
SERIAL-IN
3
I
CLOCK
Input terminal of a clock for shift register on rising edge.
4
I
LATCH
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
OUT0 ~ 15
21
I
ENABLE
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.
22
O
SERIAL-OUT
Output terminal of serial-data for next SERIAL-IN terminal.
23
I/O
R-EXT
24
VDD
Terminal of serial-data input to the shift register.
Constant Current-sinking output terminals.
An external resistor at this terminal establishes all of the
output current.
5V supply voltage terminal.
Page 2
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
TRUTH TABLE
OUT0 … OUT7 … OUT15
CLOCK
LATCH
ENABLE
SERIAL-IN
SERIAL-OUT
UP
H
L
Dn
Dn … Dn - 7 … Dn - 15
Dn - 15
UP
L
L
Dn + 1
No change
Dn - 14
UP
H
L
Dn + 2
Dn + 2 … Dn - 5 … Dn - 13
Dn - 13
DOWN
X
L
Dn + 3
Dn + 2 … Dn - 5 … Dn - 13
Dn - 13
DOWN
X
H
Dn + 3
Off
Dn - 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
2. LATCH terminal
VDD
VDD
RIN(Up)
ENABLE
LATCH
RIN(Down)
GND
3. CLOCK, SERIAL-IN terminal
GND
4. SERIAL-OUT terminal
VDD
VDD
CLOCK,
SERIAL-IN
SERIAL-OUT
GND
GND
Page 3
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
BLOCK DIAGRAM
OUT0
R-EXT
OUT1
OUT15
I-REG.
ENABLE
Q
Q
Q
ST D
ST D
ST D
LATCH
SERIAL-IN
D Q
D Q
D Q
CK
CK
CK
SERIALOUT
CLOCK
TIMING DIAGRAM
5V
CLOCK
0V
5V
SERIAL-IN
0V
5V
LATCH
0V
5V
ENABLE
0V
On
OUT0
Off
On
OUT1
Off
On
OUT2
Off
.....
On
OUT15
Off
5V
SERIAL-OUT
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.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
MAXIMUM RATINGS (Ta = 25oC)
Characteristic
Symbol
Rating
Unit
Supply Voltage
VDD
0 ~ 7.0
V
Input Voltage
VIN
- 0.4 ~ VDD +0.4
V
Output Current
IOUT
90
mA
Output Voltage
VOUT
- 0.5 ~ 20.0
V
Clock Frequency
fCLK
25
MHz
GND Terminal Current
IGND
1440
mA
Power Dissipation
Thermal Resistance
PD
Rth (j-a)
1.78 (DIP : FREE AIR, Ta = 25oC)
W
1.00 (SOP/ SSOP : ON PCB, Ta = 25oC)
70 (DIP : FREE AIR, Ta = 25oC)
oC
120 (SOP/ SSOP : ON PCB, Ta = 25oC)
/W
Operating Termerature
Topr
-40 ~ 85
oC
Storage Temperature
Tstg
-55 ~ 150
oC
(Note)
DIP : Ambient temperature derated above 25oC in the proportion of 14.2mW / oC
SOP/ SSOP: Ambient temperature delated above 25oC in the proportion of 8.3mW / oC
RECOMMENDED OPERATING CONDITION (Ta = - 40 ~ 85oC unless otherwise noted)
Characteristic
Supply Voltage
Output Voltage
Output Current
Symbol
VDD
VOUT
IO
IOH
IOL
Condition
Min.
Typ.
Max.
Unit
－
－
4.5
－
5.0
－
－
－
－
5.5
15.0
88
1.0
-1.0
V
V
VDD
+0.3
0.3
VDD
－
－
－
－
－
－
OUTn,DC test circuit
SERIAL-OUT
SERIAL-OUT
5
－
－
VIH
－
0.7
VDD
－
VIL
－
-0.3
－
20
20
-500
20
20
20
－
－
－
－
－
－
－
－
－
－
－
－
Input Voltage
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
tw LAT
tw CLK
tw EN
tsetup(D)
thold (D)
tsetup(L)
fCLK
Power Dissipation
PD
VDD = 4.5 ~ 5.5V
Cascade operation
Ta = 85oC(DIP FREE AIR)
Ta = 85oC
(SOP/ SSOP ON PCB)
Page 5
25
0.92
0.50
mA
V
ns
ns
ns
ns
ns
ns
MHz
W
V2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
ELECTRICAL CHARACTERISTICS (VDD = 5.0V, Ta = 25oC unless otherwise noted)
Characteristic
Input
Voltage
Symbol
Condition
Min.
Typ.
Max.
"H" Level
VIH
－
0.7
VDD
－
VDD
"L" Level
VIL
－
GND
－
0.3
VDD
Output Leakage Current
Output
Voltage
Current Skew
Output Current 2
Current Skew
V
IOH
VOH = 15.0V
－
－
10
VOL
IOL = 1.0mA
－
－
0.4
VOH
IOH = -1.0mA
4.6
－
－
IOL1
VCE = 0.7V
34.1
40.0
45.9
IOL2
VCE = 0.4V
REXT = 470Ω
(Include skew)
33.7
39.5
45.3
△ IOL1
IOUT = 40mA
VCE = 0.4V
REXT = 470Ω
－
± 1.5
± 4.0
%
IOL3
VCE = 0.7V
REXT = 240Ω
(Include skew)
66.3
75.0
89.7
mA
IOUT = 75mA
VCE = 0.7V
REXT = 240Ω
－
± 1.5
± 4.0
%
REXT = 470Ω, Ta = -40 ~ 85oC
－
2.5
5.0
%/V
SERIAL-OUT
Output Current 1
Unit
μA
V
△ IOL2
mA
Supply Voltage Regulation
% / VDD
Pull-Up Resistor
RIN (up)
－
150
300
600
KΩ
RIN (down)
－
100
200
400
KΩ
Pull-Down Resistor
"OFF"
Supply
Current
IDD (off) 1
REXT =OPEN, OUT0 ~ 15 = off
－
0.9
1.5
IDD (off) 2
REXT =470Ω, OUT0 ~ 15 = off
3.5
4.6
8.0
IDD (off) 3
REXT =240Ω, OUT0 ~ 15 = off
6.5
8.0
15.0
IDD (on) 1
REXT =470Ω, OUT0 ~ 15 = on
7.0
9.3
18.0
VDD (on) 2
REXT =240Ω, OUT0 ~ 15 = on
10.0
18.0
32.0
mA
"ON"
Page 6
V2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
SWITCHING CHARACTERISTICS (Ta = 25 oC unless otherwise noted)
Min.
Typ.
SERIAL-IN-OUTn
－
160
320
LATCH-OUTn
－
160
320
ENABLE-OUTn
－
160
320
CLOCK
-SERIAL-OUT
－
20
40
－
160
320
－
160
320
ENABLE-OUTn
－
160
320
CLOCK
-SERIAL-OUT
－
20
40
Characteristic
Propagation
Delay Time
("L" to "H")
Symbol
Max. Unit
tpLH
ns
VDD = 5.0V
REXT = 470Ω
VL = 3.0V
RL = 68Ω
SERIAL-IN-OUTn
Propagation
Delay Time
("H" to "L")
Condition
LATCH-OUTn
tpHL
ns
CL = 10 pF
Output Rise Time
tor
150
170
600
Output Fall Time
tof
150
180
600
ns
Page 7
V2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
TEST CIRCUIT
DC Characteristic
IDD
VDD
OUT0
ENABLE
IOL
CLOCK
IIL,IIH
LATCH
VIL,VIH
OUT15
SERIAL-IN
R-EXT
SERIAL-OUT
GND
lref
AC Characteristic
VDD
ENABLE
VIL,VIH
SWMATRIX
RL
OUT0
CL
CLOCK
LATCH
SERIAL-IN
OUT15
SERIAL-OUT
R-EXT GND
CL
VL
PRECAUTIONS FOR USING
Utmost care is necessary in the design of the output line, VDD and GND line, since IC may be destroyed due
to short-circuit between outputs, air contamination fault, or fault by improper grounding.
Page 8
V2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
TIMING WAVEFORM
1. CLOCK, SERIAL-IN, SERIAL-OUT, OUTn
tr
tf
tw CLK
tw CLK
90%
50%
10%
90%
50%
10%
CLOCK
tsetup(D)
50%
thold(D)
50%
50%
SERIAL-IN
tor
tof
90%
50%
10%
90%
50%
10%
SERIAL-OUT,
OUTn (current)
tpLH
tpHL
2. CLOCK-LATCH
50%
50%
CLOCK
SERIAL-IN
"L" level = DATA HOLD
50%
LATCH
tW LAT
50%
tsetup(L)
3. ENABLE-OUTn
tw EN
ENABLE
50%
50%
tpHL
tpLH
OUTn (Current)
50%
Page 9
50%
V2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
Output Current - Duty (LED turn-on rate)
Output Current - REXT Resistor
Ta - PD
REXT - IOUT
100
1.4
90
P/SP FREE
AIR
1.2
80
IOUT ( mA )
Power dissipation PD (W/IC)
1.6
1
0.8
0.6
F/FN ON PCB
F/FN FREE AIR
IOUT ≒ {(1.23 / REXT (Ω)} × 15.2
70
60
VCE = 0.7V
VDD = 5.0V
50
40
30
0.4
20
0.2
0
-40
10
0
-20
0
20
40
60
80
200 300
500
1,000
2,000 3,000 5,000
REXT (Ω)
Ambient Temerature Ta (oC)
Fig. 1
Output Current - Output Voltage
IOUT-VOUT
0.1
Rext=240Ω
0.09
0.08
0.07
IOUT
0.06
0.05
Rext=470Ω
0.04
0.03
0.02
0.01
Rext=3900Ω
0
0
0.5
1
1.5
2
2.5
3
VOUT
Page 10
V2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
[1] Output Current (IOUT)
IOUT is set by the enternal resistor (R-EXT) as shown in Figure1.
[2] Total supply voltage (VLED)
This device can operate at 0.4~0.7V (VOUT). When a higher voltage is input to the device, the excess
voltage is consumed inside the device, that leads to more power dissipation.
In order to minimize power dissipation and loss, we would like to recommend to set the total supply voltage
as shown below,
VLED (total supply voltage)=VOUT (IC Supply Voltage)+ Vf (LED Forward voltage)
+ VDS (MOSFET Voltage Drop)
When the total supply is too high considering the power dissipation of this device, an additional R can
decrease the OUT voltage (VOUT).
PATTERN LAYOUT
VLED = 3 ~ 4 (V)
VDD
SCAN
SDM4952
SDM4953
VDS SDM9435A
VDD
ENABLE
CLOCK
LATCH
SERIAL-IN
R-EXT
Vf
VDD
OUT0
VOUT
OUT15
GND
SERIAL-OUT
CPU
VDD
ENABLE
CLOCK
LATCH
SERIAL-IN
R-EXT
VDD
Vf
OUT0
VOUT
OUT15
GND
SERIAL-OUT
[3] Pattern Layout
This device has only one ground pin that means signal ground pin and power ground pin are common.
If ground pattern layout contains large inductance and impedance, and the voltage between ground
and LATCH, CLOCK terminals exceeds 2.5V by switching noise during operation, this device may missoperate. So we would advise you to pay attention to pattern layout to minimize ground inductance.
Page 11
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
PACKAGE OUTLINE
SM16706P 24 PIN SKINY DIP
1
12
7.62
0.25
6.55
0.1
0.05
13
0.2
24
0~15
Unit : mm
32.5 MAX
31.75 + 0.2
3.3
5.3
3.3
0.51 MIN
0.18 M
1.221 TYP
2.54
1.52
0.46 + 0.1
Page 12
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
PACKAGE OUTLINE
SM16706SP 24 PIN SDIP
1
12
7.62
0.25
6.4
0.1
0.05
13
0.2
24
0~15
Unit : mm
22.5 MAX
22.0 0.2
3.5 0.2
4.2 0.3
3.0 0.3
0.51 MIN
0.18 M
1.221 TYP
1.778 1.0
0.1
0.46 0.1
Page 13
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
PACKAGE OUTLINE
0.102
0.330
10.312
Unit : mm
7.493
SM16706F 24 PIN SOP
0.508*45
0.406 TYP
1.27 TYP
0.889
0.102max
0.305 max
Page 14
0.381
0.254
0.1524
0.356
2.515
15.24
= 0~8
V.2.0 MAY,2003
SAMHOP Microelectronics Corp.
SM16706P/SP/F/FN
16-BIT CONSTANT CURRENT LED DRIVER
PACKAGE OUTLINE
SM16706FN 24 PIN SSOP
Unit : mm
1
( 300 mil )
0.3
7.6
7.62
0.2
12
0.13 M
0.1
0.1
0.05
8.3 MAX
0.15
7.8 0.2
0.1
0~10
0.22
1.6 MAX
0.65
1.2 0.2
0.325 TYP
5.6
13
24
0.45 0.2
0.1
0.05
Page 15
V.2.0 MAY,2003