HT6222 [HOLTEK]
Multi-Purpose Encoders; 多功能编码器
| 型号： | HT6222 |
| 厂家： | 
HOLTEK SEMICONDUCTOR INC |
| 描述： | Multi-Purpose Encoders |
| 文件： | 总13页 (文件大小：154K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HT6221/HT6222
Multi-Purpose Encoders
Features
·
·
·
·
·
·
·
Operating voltage: 1.8V~3.5V
DOUT with 38kHz carrier for IR medium
Low standby current
·
·
·
PPM code method
Three double-active keys
Maximum active keys
-
Minimum transmission word: one word
455kHz ceramic resonator or crystal
16-bit address codes
HT6221: 32 keys
HT6222: 64 keys
-
·
Low power and high noise immunity
CMOS technology
8-bit data codes
Applications
·
Television and video cassette recorder con-
trollers
Burglar alarm systems
·
·
·
·
Car door controllers
Car alarm systems
Security systems
·
·
·
Smoke and fire alarm systems
Garage door controllers
Other remote control systems
General Description
The HT6221/HT6222 are CMOS LSI encoders
designed for use in remote control systems. They
are capable of encoding 16-bit address codes and
8-bit data codes. Each address/data input can be
set to one of the two logic states, 0 and 1.
The HT6221/HT6222 contain 32 keys
(K1~K32) and 64 keys (K1~K64), respectively.
When one of the keys is triggered, the pro-
grammed address/data is transmitted together
with the header bits via an IR (38kHz carrier)
transmission medium.
Block Diagram
X
2
X
1
D
a
t
a
S
e
l
e
c
t
U
D
O
T
O
s
c
i
l
l
a
t
o
r
D
i
v
i
d
e
r
&
B
u
f
f
e
r
L E
D
¸
2
4
C
o
u
n
t
e
e
r
c
&
c
S
y
n
.
R
R
1
8
K
e
y
b
o
a
r
d
1
o
f
2
4
D
o
d
e
r
t
C
i
r
c
u
i
M
a
t
r
i
x
&
a
D
t
a
R
O
M
G
a
t
e
&
R
e
g
i
s
t
e
r
s
C
i
r
c
u
i
t
B
i
n
a
r
y
D
e
t
e
c
t
o
r
V
D
D
V
S
S
C
1
C
8
A
I
N
D
7
1
March 2, 2000
HT6221/HT6222
Pin Assignment
1
2
3
4
5
6
7
8
9
1
1
1
R
R
R
R
R
R
3
4
5
6
7
8
2
2
2
2
2
1
1
1
1
1
1
1
4
3
2
1
0
9
8
7
6
5
4
3
R
R
A
C
C
C
C
C
C
C
C
L
2
1
R
R
R
R
1
2
3
4
2
1
1
1
1
1
1
1
1
1
0
9
8
7
6
5
4
3
2
1
1
2
3
4
5
6
7
8
9
1
A
C
C
C
C
C
C
C
C
L
I
N
I
N
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
D
O
U
T
D
O
U
T
V
D
D
V
D
D
D
7
D
7
X
X
2
1
0
1
2
X
X
2
1
V
S
S
V
S
S
0
E
D
E
D
H
T
6
2
2
1
H
T
6
2
2
2
2
0
D
I
P
/
S
O
P
2
4
D
I
P
/
S
O
P
Pad Assignment
K
I
O
0
2
3
2
2
4
2
2
1
2
0
1
9
K
I
4
1
K
K
I
I
5
6
2
3
K
K
I
I
O
O
1
2
1
8
1
7
(
0
,
0
)
4
5
K
I
7
1
1
6
5
K
K
I
I
O
O
3
4
R
E
M
V
D
D
6
7
8
1
4
K
I
O
5
S
E
L
9
O
S
C
O
1
0
1
1
1
3
1
2
Chip size: 94 ´ 104 (mil)2
* The IC substrate should be connected to VDD in the PCB layout artwork.
2
March 2, 2000
HT6221/HT6222
Pad Coordinates
Unit: mil
Pad No.
X
Y
Pad No.
13
X
Y
1
2
34.43
22.02
15.39
2.98
34.17
41.95
41.95
41.95
41.95
41.95
39.99
28.26
-11.18
-23.16
-29.79
-39.27
-41.99
-41.99
-41.99
-41.99
-41.99
-41.99
-41.99
-41.99
-20.95
-14.32
-4.25
-46.88
-30.26
-13.98
-4.12
12.16
22.02
46.84
46.84
46.84
46.84
46.84
46.84
14
3
15
4
16
5
17
-5.61
-28.31
-37.83
-46.88
-46.88
-46.88
-46.88
-46.88
6
18
7
19
8
20
9
21
10
11
12
22
23
24.31
24
Pin Description
HT6222
Internal
Connection
Pin No. Pin Name I/O
Description
CMOS IN
Pull-low
1~6
7
R3~R8
DOUT
VDD
I
Row control for keyboard matrix, active high
Serial data output pin, with a 38kHz carrier
O
¾
CMOS OUT
Positive power supply, 1.8V~3.5V for normal
operation
8
¾
9
D7
I
O
I
CMOS IN
OSCILLATOR
OSCILLATOR
¾
Most significant data bit (D7) code setting
455kHz resonator oscillator output
455kHz resonator oscillator input
Negative power supply
10
11
12
13
X2
X1
VSS
LED
¾
O
CMOS OUT
Transmission enable indicator output
CMOS IN/OUT
Pull-low
14~21
22
C8~C1
AIN
I/O
Column control for keyboard matrix
CMOS IN
Pull-high
Pull-low
I
I
Low byte address codes (8 bits) scan input
Row control for keyboard matrix, active high
CMOS IN
Pull-low
23~24
R1~R2
3
March 2, 2000
HT6221/HT6222
Approximate internal connection circuits
C
M
O
S
I
N
/
O
U
T
C
M
O
S
I
N
/
O
U
T
C
M
O
S
I
N
C
M
O
S
O
U
T
C
P
M
O
S
I
N
P
u
l
l
-
l
o
w
u
l
l
-
l
o
w
V
D
D
V
D
D
O
S
C
I
L
L
A
T
O
R
X
1
X
2
1
W
0 M
E
N
Absolute Maximum Ratings
Supply Voltage.................................-0.3V to 6V
Input Voltage.................VSS-0.3V to VDD+0.3V
Storage Temperature.................-50°C to 125°C
Operating Temperature ..............-20°C to 75°C
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maxi-
mum Ratings" may cause substantial damage to the device. Functional operation of this device
at other conditions beyond those listed in the specification is not implied and prolonged expo-
sure to extreme conditions may affect device reliability.
Electrical Characteristic
Ta=25°C
Test Conditions
Symbol
Parameter
Min. Typ. Max. Unit
VDD
Conditions
VDD
ISTB
Operating Voltage
Standby Current
1.8
3
3.5
1.0
V
¾
¾
3V Oscillator stops
0.1
¾
mA
fOSC=455kHz
No load
IDD
Operating Current
3V
200 400
¾
mA
IOH1
IOL1
IOH2
IOL2
IOH3
VO=2.7V
VO=0.3V
VO=2.7V
VO=0.3V
VO=2.7V
Output Source Current for DOUT
Output Sink Current for DOUT
Output Source Current for LED
Output Sink Current for LED
Output Source Current for C1~C8
3V
3V
3V
3V
3V
mA
mA
-2.0 -4.0
50 100
-10 -60
1.2 2.0
-0.6 -2.0
¾
¾
¾
¾
¾
mA
mA
mA
4
March 2, 2000
HT6221/HT6222
Test Conditions
Symbol
Parameter
Min. Typ. Max. Unit
VDD
Conditions
IOL3
VIH1
VIL1
VIH2
VIL2
VIH3
VIL3
RPH1
RPL1
RPL2
RPL3
VO=0.3V
Output Sink Current for C1~C8
Input High Voltage for R1~R8
Input Low Voltage for R1~R8
Input High Voltage for C1~C8
Input Low Voltage for C1~C8
Input High Voltage for AIN
3V
3V
3V
3V
3V
3V
3V
3V
3V
10
1.9
0
30
¾
¾
¾
¾
¾
¾
¾
mA
V
3.0
0.8
3.0
0.6
3.0
0.6
¾
¾
¾
¾
¾
¾
V
1.1
0
V
V
1.25
0
V
Input Low Voltage for AIN
V
VIN=0V
VIN=3V
VIN=3V
VIN=3V
Input Pull-high Resistance for AIN
Input Pull-low Resistance for AIN
100 200 400
70 150 250
kW
kW
kW
kW
Input Pull-low Resistance for R1~R8 3V
Input Pull-low Resistance for C1~C8 3V
120 200 320
300 500 1500
455kHz ceramic
resonator
fOSC
System Frequency
455
kHz
¾
¾
¾
Functional Description
Keyboard scan
·
The HT6222 keyboard form
The HT6221/HT6222 remain in the halt mode
during the standby state (at this time, the oscil-
lator stops, and the standby current<1mA). The
HT6221 consists of 32 active keys, and the
HT6222 has 64 active keys. The keyboard
forms of the HT6221/ HT6222 are shown below.
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
K
K
K
K
1
2
3
4
K
K
K
K
5
6
7
8
K
9
K
K
K
K
K
K
K
K
1
1
1
1
4
4
4
4
3
4
5
6
5
6
7
8
K
K
K
K
K
K
K
K
1
1
1
2
4
5
5
5
7
8
9
0
9
0
1
2
K
K
K
K
K
K
K
K
2
2
2
2
5
5
5
5
1
2
3
4
3
4
5
6
K
K
K
K
K
K
K
K
2
2
2
2
5
5
5
6
5
6
7
8
7
8
9
0
K
K
K
K
K
K
K
K
2
3
3
3
6
6
6
6
9
0
1
2
1
2
3
4
R
R
R
R
R
R
R
R
1
2
3
4
5
6
7
8
K
K
K
K
K
K
K
1
1
1
4
4
4
4
0
1
2
1
2
3
4
·
The HT6221 keyboard form
K
K
K
K
3
3
3
3
3
4
5
6
K
K
K
K
3
3
3
4
7
8
9
0
C
1
C
2
C
3
C
C
5
4
C
6
C
7
C
8
K
K
K
K
1
2
3
4
K
K
K
K
5
6
7
8
K
9
K
K
K
K
1
1
1
1
3
4
5
6
K
K
K
K
1
1
1
2
7
8
9
0
K
K
K
K
2
2
2
2
1
2
3
4
K
K
K
K
2
2
2
2
5
6
7
8
K
K
K
K
2
3
3
3
9
0
1
2
R
R
R
R
1
2
3
4
K
K
K
1
1
1
0
1
2
5
March 2, 2000
HT6221/HT6222
When one of the keys (32 or 64 keys) is triggered
for over 36ms, the oscillator is enabled and the
chip is activated. If the key is pressed and held
for 108ms or less, the 108ms transmission codes
are enabled and comprised of a header code
(9ms), an off code (4.5ms), low byte address
codes (9ms~18ms), high byte address codes
(9ms~18ms), 8-bit data codes (9ms~18ms), and
the inverse codes of the 8-bit data codes
(18ms~9ms). After the pressed key is held for
108ms, if the key is still held down, the trans-
mission codes turn out to be a composition of
header (9ms) and off codes (2.5ms) only.
To avoid mistakes made by keyboard scanning
or simultaneous two-key inputs (except for the
three double-key active functions (K21+K22,
K21+K23, and K21+K24), the HT6221/HT6222
are facilitated with 36ms starting time.
The HT6221/HT6222 also provide three dou-
ble-key active functions (K21+K22, K21+K23,
and K21+K24) for tape deck recording opera-
tions. The double-key operation rules are
shown in timing 4 and timing 6.
Transmission codes
The transmission codes of the HT6221/6222 consist of a 9ms header code, a 4.5ms off code, 16-bit ad-
dress codes (18ms~36ms), 9ms~18ms 8-bit data codes, and the inverse code of the 8-bit data codes. The
following is an illustration of the transmission codes:
K
e
y
-
i
n
K
e
y
E
n
a
b
l
e
s
(
K
1
~
K
6
4
)
3
6
m
s
m
i
n
.
X
2
F
o
s
c
=
4
5
5
k
H
z
4
.
5
m
s
0
.
5
6
m
s
0
.
5
c
6
m
s
3
3
8
3
k
%
H
z
,
u
D
O
U
T
d
t
y
a
r
r
i
e
r
4
5
m
s
~
6
3
m
s
2
.
5
m
s
2
.
5
m
s
9
m
s
9
m
s
9
m
s
(
A
0
~
A
1
5
+
D
0
~
D
7
+
D
0
~
D
7
)
1
0
8
m
s
1
0
8
m
s
Output format for the DOUT
The output code carrier of the DOUT pin is shown in Timing 2:
3
8
k
H
z
C
a
r
r
i
e
r
8
.
7
7
m
s
2
6
.
3
m
s
38kHz carrier
The transmission codes employ the PPM (Pulse Position Modulation) method to represent their two
logic states by "0" (1.12ms) and "1" (2.24ms) as shown in Timing 3:
3
8
k
H
z
c
a
r
r
i
e
r
"
Z
e
r
o
"
0
.
5
6
m
s
d
a
t
a
p
e
r
i
o
d
(
1
.
1
2
m
s
)
3
8
k
H
z
c
a
r
r
i
e
r
"
O
n
e
"
d
a
t
a
p
e
r
i
o
d
(
2
.
2
4
m
s
)
Logic states
6
March 2, 2000
HT6221/HT6222
·
Setting the address codes (A0~A15)
external switch S0~S7 and the ROM1. The
A8~A15 equal some bits inverted to A0~A7,
the inversion are decided by Logical OR be-
tween the external switch S8~S15 and the
ROM2.
The algorithm rule of the address codes
(A0~A15) can be selected by mask option.
In this case, the 16-bit on-chip MASK ROM
(ROM1 and ROM2) are available, and the
value of ROM1 (8 bits) and ROM2 (8 bits) are
decided by one MASK LAYER. The current
value of ROM1 and ROM2 are both "00H".
The A0~A7 are set by logical OR between the
For example:
The following is an illustration of these rules in
selecting the address codes (A0~A15).
H
T
6
2
2
1
/
H
T
6
2
2
2
A
I
N
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
2
W
´
S
8
S
9
S
1
0
S
1
1
S
1
2
S
1
3
S
1
4
S
1
5
1
N
4
1
8
´
4
8
S
0
S
1
S
2
S
3
S
4
S
5
S
6
S
7
(
S
w
i
t
c
h
O
p
e
n
:
0
,
S
w
i
t
c
h
C
l
o
s
e
:
1
)
1
0
0
0
:
1
1
0
0
E
x
t
e
r
n
a
l
S
w
i
t
c
h
S
0
~
S
1
5
O
n
-
c
h
i
p
R
0
O
M
1
,
0
R
O
M
0
2
:
0
0
0
0
0
0
b
i
t
0
b
b
i
i
t
t
7
b
i
t
7
S
0
~
S
7
O
R
R
O
M
1
A
0
~
A
7
:
1
0
0
0
1
1
0
0
S
8
~
S
1
5
O
R
R
O
M
2
A
8
'
~
A
1
5
'
:
1
0
1
0
0
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
C
1
0
o
m
p
l
e
m
e
n
t
A
8
~
A
1
5
:
1
1
0
1
0
1
1
1
:
:
n
o
n
i
n
v
e
r
s
i
o
n
i
n
v
e
r
s
i
o
n
7
March 2, 2000
HT6221/HT6222
·
Values of the data codes (D0~D7)
Table 3: Double-key data code table
The HT6221/HT6222 contain 32 and 64 ac-
tive keys, respectively. Each key corresponds
to a data code. For tape deck recording, the
HT6221/HT6222 provide three double-key
functions. The double-key, single-key, and
double-key operation rules are shown in Ta-
ble 3, Table 4, Timing 4, Timing 5 and Timing
6.
Data Codes
D0~D6
Data Code
D7
KEY
K21+K22
K21+K23
K21+K24
1010110
0110110
1110110
0/1
0/1
0/1
Note: D7 is defined by an external switch
Table 4: K1~K64 single-key data code table
Data Codes Data Code
KEY
Data Codes
D0~D6
Data Code
D7
KEY
D0~D6
0000 000
1000 000
0100 000
1100 000
0010 000
1010 000
0110 000
1110 000
0001 000
1001 000
0101 000
1101 000
0011 000
1011 000
0111 000
1111 000
0000 100
1000 100
0100 100
1100 100
0010 100
1010 100
0110 100
1110 100
0001 100
D7
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
K1
K2
K33
K34
K35
K36
K37
K38
K39
K40
K41
K42
K43
K44
K45
K46
K47
K48
K49
K50
K51
K52
K53
K54
K55
K56
K57
0000 001
1000 001
0100 001
1100 001
0010 001
1010 001
0110 001
1110 001
0001 001
1001 001
0101 001
1101 001
0011 001
1011 001
0111 001
1111 001
0000 101
1000 101
0100 101
1100 101
0010 101
1010 101
0110 101
1110 101
0001 101
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
0/1
K3
K4
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
K17
K18
K19
K20
K21
K22
K23
K24
K25
8
March 2, 2000
HT6221/HT6222
Data Codes Data Code
Data Codes
Data Code
D7
KEY
KEY
D0~D6
1001 100
0101 100
1101 100
0011 100
1011 100
0111 100
1111 100
D7
0/1
0/1
0/1
0/1
0/1
0/1
0/1
D0~D6
1001 101
0101 101
1101 101
0011 101
1011 101
0111 101
1111 101
K26
K27
K28
K29
K30
K31
K32
K58
K59
K60
K61
K62
K63
K64
0/1
0/1
0/1
0/1
0/1
0/1
0/1
Note: D7 is defined by an external switch
D7=0 : connect to VDD
D7=1 : connect to VSS
K
2
1
I
n
p
u
t
K
2
1
K
m
I
n
p
u
t
K
m
3
6
m
s
<
t
<
1
3
2
6
6
m
m
s
s
3
6
m
s
1
0
8
m
s
(
m
i
n
.
n
)
D
O
U
T
K
2
1
c
o
d
e
t
r
a
s
m
i
s
s
i
o
n
(
a
)
K
2
1
I
n
p
u
t
K
2
1
K
m
I
n
p
u
t
K
m
0
<
t
t
<
<
3
3
6
6
m
m
s
s
N
o
t
r
a
n
s
m
i
s
s
i
o
n
D
O
U
T
(
b
)
K
2
1
I
n
p
u
t
K
2
1
0
<
K
m
I
n
p
u
t
K
m
N
o
t
r
a
n
s
m
i
s
s
i
o
n
D
O
U
T
(
c
)
K
2
1
I
n
p
u
t
K
2
1
K
m
I
n
p
u
t
K
3
m
3
6
m
s
<
t
<
1
2
6
6
m
m
s
s
3
6
m
s
1
0
8
m
s
(
m
i
n
.
)
D
O
U
T
K
m
c
o
d
e
t
r
a
n
s
m
i
s
s
i
o
n
(
d
)
Invalid double-key input
9
March 2, 2000
HT6221/HT6222
K
n
I
n
p
u
t
K
n
3
6
m
s
t
>
1
0
8
m
s
D
O
U
T
K
n
c
o
d
e
t
r
a
n
s
m
i
s
s
i
o
n
(
a
)
K
n
I
n
p
u
t
K
n
t
<
1
0
8
m
s
1
0
8
m
s
3
6
m
s
D
O
U
T
K
n
c
o
d
e
t
r
a
n
s
m
i
s
s
i
o
n
(
b
)
Note: Kn can be one of K1~K64
Valid single-key input
K
2
1
I
n
p
u
t
K
2
1
K
m
I
n
p
u
t
K
m
3
6
m
s
3
6
m
s
t
>
1
2
6
m
s
1
0
8
m
s
(
m
i
n
.
)
K
2
1
+
K
m
c
o
d
e
D
O
U
T
K
2
1
c
o
d
e
t
r
a
n
s
m
i
s
s
i
o
n
i s
t
r
a
n
s
m
s
i
o
n
Note: Km can be one of K22~K24
Valid double-key input
DOUT and LED
After the transmission codes are sent, the DOUT pin generates transmission codes with a carrier,
and the LED goes low to drive a transmission indicator.
10
March 2, 2000
HT6221/HT6222
Application Circuits
Application circuit 1
V
D
D
1
.
8
V
~
3
.
5
V
I
n
f
r
a
r
e
d
4
m
7
F
/
1
6
V
3
3
W
0
4
W
7
1
0
0
p
F
1
0
0
p
F
1
W
k
L
E
D
4
5
5
k
H
z
8
0
5
0
c
e
r
a
m
i
c
r
e
s
o
n
a
t
o
r
9
8
1
1
6
5
D
O
U
T
X
1
X
2
L
E
D
V
D
D
7
1
0
D
7
H
T
6
2
2
1
V
S
S
C
1
C
2
C
3
C
C
4
6
C
C
5
7
C
8
R
1
R
A
2
I
N
R
3
R
4
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
2
3
4
2
0
5
1
W
k
8
K
K
K
K
1
2
3
4
K
K
K
K
5
6
7
8
K
9
K
K
K
K
1
1
1
1
K
K
K
K
3
4
5
6
1
1
1
2
K
K
K
K
7
8
9
0
2
2
2
2
K
K
K
K
1
2
3
4
2
2
2
2
K
K
K
K
5
6
7
8
2
3
3
3
9
0
1
2
K
K
K
1
1
1
0
1
2
1
N
4
´
8
1
4
8
Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.)
11
March 2, 2000
HT6221/HT6222
Application circuit 2
V
D
D
1
.
8
V
~
3
.
5
V
I
n
f
r
a
r
e
d
4
m
7
F
/
1
6
V
3
3
W
0
4
W
7
1
0
0
p
F
1
0
0
p
F
1
W
k
4
5
5
k
H
z
8
0
5
0
c
e
r
a
m
i
c
r
e
s
o
n
a
t
o
r
1
1
1
0
1
3
8
7
D
O
U
T
X
1
X
2
L
E
D
V
D
D
1
2
9
D
7
V
S
S
H
T
6
2
2
2
C
1
C
2
C
3
C
C
4
6
C
C
5
7
R
C
1
8
R
2
R
3
R
4
R
5
R
A
6
I
N
R
7
R
8
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
2
3
2
4
1
2
3
4
5
6
5
1
W
k
8
K
K
K
K
1
2
3
4
K
K
K
K
5
6
7
8
K
9
K
K
K
K
K
K
K
K
1
1
1
1
4
4
4
4
K
K
K
K
K
K
K
K
3
4
5
6
5
6
7
8
1
1
1
2
4
5
5
5
K
K
K
K
K
K
K
K
7
8
9
0
9
0
1
2
2
2
2
2
5
5
5
5
K
K
K
K
K
K
K
K
1
2
3
4
3
4
5
6
2
2
2
2
5
5
5
6
K
K
K
K
K
K
K
K
5
6
7
8
7
8
9
0
2
3
3
3
6
6
6
6
9
0
1
2
1
2
3
4
K
K
K
K
K
K
K
1
1
1
4
4
4
4
0
1
2
1
2
3
4
K
K
K
K
3
3
3
3
K
K
K
K
3
4
5
6
3
3
3
4
7
8
9
0
1
N
4
´
8
1
4
8
Note: Typical infrared diode: EL-1L2 (KODENSHI CORP.)
12
March 2, 2000
HT6221/HT6222
Holtek Semiconductor Inc. (Headquarters)
No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: 886-3-563-1999
Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)
5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: 886-2-2782-9635
Fax: 886-2-2782-9636
Fax: 886-2-2782-7128 (International sales hotline)
Holtek Semiconductor (Hong Kong) Ltd.
RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong
Tel: 852-2-745-8288
Fax: 852-2-742-8657
Copyright Ó 2000 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek
assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are
used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications
will be suitable without further modification, nor recommends the use of its products for application that may pres-
ent a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior
notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
13
March 2, 2000
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