A. General Description --
The HT2050 is a low cost, low-power C-MOS LSI designed for lamp and
LED flash driver. It has five flash outputs with 10mA drive capability that can
implement random or sequence flashing function controlled by one option pin.
It only requires one external resistor for typical application. It is very suitable
for the use of the flash products such as disco glasses, disco hat, gift card,
X'mas decoration and so forth.
B. Features --
C-MOS Metal-Gate Process.
Operating voltage: 1.2V ~ 4.5V.
Low stand-by current: 1
A at 3V.
Five lamp flash driver with 10mA driving capability.
Random or sequence flash selection
toggle on/off control function.
1/10 duty cycle output.
Built-in oscillator.
Minimum external components.
C. Block Diagram --
HT-- 2050
DEC.29.1993
FIVE LAMP/LED FLASH DRIVER
PAGE: 1
D. Pin Assignment --
E. Pad Assignment & Position --
C h ip S iz e : 6 4
5 9 (m il)
2
* The IC substrate should be connected to VDD in PCB layout artwork.
U n it: m il
Pad No.
Symbol
x
Y
Pad No.
Symbol
X
Y
1
OUT1
21.09
20.9
7
OSC2
26.55
26.5
2
OUT2
9.89
20.9
8
VDD
13.35
26.5
3
OUT3
1.31
20.9
9
TEST
6.15
26.5
4
OUT4
12.51
20.9
10
OPT
10.89
26.5
5
OUT5
23.71
20.9
11
ON/OFF
26.25
26.5
6
OSC1
26.23
13.3
12
VSS
26.25
10.98
HT-- 2050
DEC.29.1993
FIVE LAMP/LED FLASH DRIVER
PAGE: 2
F. Absolute Maximum Ratings --
Parameter
Symbol
Minimum
Maximum
Unit
Supply Voltage
V
DD
0.3
5
V
Input/Output Voltage
V
I, VO
V
SS
0.3
V
DD
+0.3
V
Storage Temperature
T
STG
50
125
C
Operating Temperature
T
OP
0
70
C
G. Electrical Characteristics --
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
DD
Condition
V
DD
Operating Voltage
--
--
1.2
3
4.5
V
I
STB
Stand-by Current
3V
--
--
1
2
A
I
DD
Operating Current
3V
No load
--
200
500
I
OL
Output Sink Current
1.5V
V
OL
=0.5V
5
8
--
mA
3V
V
OL
=0.5V
10
15
--
mA
F
OSC
Oscillator Frequency
--
R=150K~300K
--
64K
--
Hz
HT-- 2050
DEC.29.1993
FIVE LAMP/LED FLASH DRIVER
PAGE: 3
H. Pad Description --
Pad No.
Pad Name
I/O
Description
1
OUT1
O
Lamp/LED flash drive output pad.
2
OUT2
O
Lamp/LED flash drive output pad.
3
OUT3
O
Lamp/LED flash drive output pad.
4
OUT4
O
Lamp/LED flash drive output pad.
5
OUT5
O
Lamp/LED flash drive output pad.
6
OSC1
I
Oscillator input pad.
7
OSC2
O
Oscillator output pad.
8
VDD
I
Positive power supply.
9
TEST
I/O For IC test only.
10
OPTION
I
Random or sequence function selection pad.
11
ON/OFF
I
Togale ON/OFF control pad.
12
VSS
I
Negative power supply, GND.
Note: OPTION= 1
Sequence Mode
OPTION= Open
Random Mode
HT-- 2050
DEC.29.1993
FIVE LAMP/LED FLASH DRIVER
PAGE: 4
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