HT2050.PDF

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HT2050
Five LAMP/LED Flash Driver
Features
·
C-MOS Metal-Gate Process
·
On/Off toggle control
·
Operating voltage: 1.2V~4.5V
·
1/10 duty cycle output
·
Low stand-by current: 1
m
A at 3V
·
A built-in oscillator
·
A five lamp flash driver
·
Minimum external components
·
Random or sequence flash
General Description
The HT2050 is a low cost, low-power CMOS
fabricated LSI chip designed for lamp and LED
flash drivers. It contains five flash outputs.
Each flash output is with a 10mA capability
that can implement random or sequential flash-
ing controlled by a single option pin. The chip
requires only one external resistor for normal
applications. It is very suitable for use in prod-
ucts that require flashing lights, such as gift
cards, Christmas decoration, etc.
Pin Assignment
Block Diagram
Pad Coordinates
Unit: mil
Pad No.
X
Y
Pad No.
X
Y
1
–21.09 –20.9
7
26.55
26.5
2
–9.89 –20.9
8
13.35
26.5
3
1.31 –20.9
9
6.15
26.5
4
12.51 –20.9
10
–10.89 26.5
5
23.71 –20.9
11
–26.25 26.5
6
26.23
13.3
12
–26.25 10.98
Chip size: 64
´
59 (mil) 2
* The IC substrate should be connected to VDD in the
PCB layout artwork.
1
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HT2050
Pad Description
Pad No. Pad Name I/O
Description
1
OUT1
O Lamp/LED flash drive output
2
OUT2
O Lamp/LED flash drive output
3
OUT3
O Lamp/LED flash drive output
4
OUT4
O Lamp/LED flash drive output
5
OUT5
O Lamp/LED flash drive output
6
OSC1
I Oscillator input
7
OSC2
O Oscillator output
8
VDD
I Positive power supply
9
TEST
I/O For IC test only
10
OPTION
I Random or sequence function selection
11
ON/OFF
I Toggle ON/OFF control
12
VSS
I Negative power supply, GND
Note: OPTION=VDD
®
Sequential Mode
OPTION=Open
®
Random Mode
Absolute Maximum Ratings
Supply Voltage ................................. –0.3V to 5V
Storage Temperature................. –50
°
C to 125
°
C
Input/Output Voltage ... V SS –0.3V to V DD +0.3V
Operating Temperature................... 0
°
C to 70
°
C
Electrical Characteristics
Test Condition
Symbol
Parameter
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
m
A
I DD
Operating Current
3V
No load
—
200
500
m
A
1.5V V OL =0.5V
5
8
—
mA
I OL
Output Sink Current
3V
V OL =0.5V
10
15
—
mA
F OSC
Oscillator Frequency
—
R=150K~300K
W
—64K—z
2
26th Mar ’97
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HT2050
Application Circuit
3
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