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HT93214 Series 1-memory Tone/Pulse Dialer
Features
* Operating Voltage: 2.0V~5.5V * Low standby current * Low memory retention current: 0.1mA (Typ.) * Tone/Pulse switchable * 32 (pulse)/31 (tone) digits for redialing * Pause and P (R) T key for PBX * 44 keyboard matrix * 3.58MHz crystal or ceramic resonator * Hand-free control
Patent Number: 86474, 84545(R.O.C)
* Pause, P (R) T can be saved for redialing * One-key redialing * Keytone output * Pause time: 2.2s * Cascadable manual dialing after redialing * Calibrated DTMF timing for redialing * HT93214A: 16-pin DIP package
HT93214B/AT: 18-pin DIP package
General Description
The HT93214 are dialer series designed for low cost telephone set applications with expandable features such as Lock function, keytone and LCD display interface. With a 44 keyboard, it performs normal tone/pulse switchable dialing, and provides one-key redialing function with a 32-digit memory for speed dialing. An on-chip oscillator is built-in to work with an external 3.58Mhz crystal or ceramic resonator for accurate timing. The HT93214 provides 300ms (F1 key) and 600ms (F2 key) of flash time; Tone dialing and 10pps, 20pps selection with 1/2 M/B ratio for pulse dialing.
Selection Table
HT93214 series Function HandFree Part No. HT93214A HT93214B HT93214AT O O Key Tone Flash Control Control Control Flash Time (ms) 300/600 300/600 300/600 Inter Tone Pulse Tone Duration No. Pause (ms) (ms) N N N 94 94 94 96 96 96 PPS 10/20 10/20 10/20 M/B 1/2 1/2 1/2 PKG DIP 300mil 16 18 18
Rev. 1.10
1
October 2, 2002
HT93214 Series
Block Diagram
C1 Key C o lu m n C3
.SM
C o n tro l
C heck
Key . u n c tio n E ncoder
W RM C o u n te r ADDRL
SRAM
Tone E ncoder C o n v e rte r
Tone O ut P u ls e O ut
DTM .
PO XM UTE
R1 Key Row R4
E ncoder C lo c k C o n tro l . la s h /M o d e H. HKS H.I H.O MODEO MODE K e y to n e G e n e ra to r KT
D ebounce
X1 X2
D iv id e r
C lo c k G e n e ra to r
M /B
T im e r
Pin Assignment
H.O 1 2 3 4 5 6 7 8 9 HKS MODE X1 X2 VSS VDD DTM . XM UTE 8 7 6 5 4 3 2 1 16 15 14 13 12 11 10 9 R4 R3 R2 R1 C3 C2 C1 PO HKS MODE X1 X2 VSS VDD DTM . XM UTE 18 17 16 15 14 13 12 11 10 H.I R4 R3 R2 R1 C3 C2 C1 PO HKS 1 2 3 4 5 6 7 8 9 MODE X1 X2 VSS VDD DTM . XM UTE MODEO 18 17 16 15 14 13 12 11 10 R4 R3 R2 R1 C3 C2 C1 PO KT
H T93214A 1 6 D IP -A
H T93214B 1 8 D IP -A
H T93214A T 1 8 D IP -A
Keyboard Information
C1 R1 R2 R3 R4 7 8 0 # * /T 4 5 9 R 1 2 6 C2 C3 3 HKS .1 .2 P
Rev. 1.10
2
October 2, 2002
HT93214 Series
Pin Description
Pin Name I/O Internal Connection Description These pins along with the HKS form a 44 keyboard matrix which can perform keyboard input detection. When on-hook (HKS=high) all the pins are set high. While off-hook the column group (C1~C3) is set low and the row group (R1~R4) remains high for input detection. Pressing a key connects a single row to a single column HKS and actuates the system oscillator that results in a dialing signal output. If more than two keys are pressed at the same time, no response occurs. The key-in debounce time is 20ms. The system oscillator consists of an inverter, a bias resistor and the necessary load capacitor on chip. Connecting a standard 3.579545MHz crystal or ceramic resonator to the X1 and X2 terminals can implement the oscillator function. The oscillator is turned off in the standby mode, and is actuated whenever a keyboard entry is detected. NMOS open drain structure pulled to VSS during dialing signal transmission. Otherwise, it is an open circuit. This pin is used to mute the speech circuit when transmitting the dial signal. This pin is used to monitor the status of the hook-switch and its combination with HFI can control the PO pin output to make or break the line. HKS=VDD: On-hook state (PO=low). Except for HFI (hand-free control input), other functions are all disabled. HKS=VSS: Off-hook state (PO=high). The chip is in the stand-by mode and ready to receive the key input. NMOS open drain output structure, which by receiving the HKS and HFO signals, control the dialer so as to connect or disconnect the telephone line. PO is pulled to VSS when HKS is high (on-hook) and HFO is low. PO is an open circuit which make the line connection when HKS is low (off-hook) or HFO is high. During the off-hook state, this pin also outputs the dialing pulse train in pulse mode dialing. While in the tone mode, this pin is always an open circuit. This is a tri-state input/output pin, used for dialing mode selection, either Tone mode or Pulse mode, 10pps/20pps MODE=VDD: Pulse, 10pps, M/B=1/2 MODE=Floating: Pulse, 20pps, M/B=1/2 MODE=VSS: Tone. The MODE selection is checked each time a key input is received. This pin is active only when the chip transmits tone dialing signals. Otherwise, it always outputs a low. The pin outputs tone signals to drive the external transmitter amplifier circuit. The load resistor (to VSS) should not be less than 5kW and any DC load connected to VDD is not allowed. NMOS open drain structure for keytone output. It outputs 34ms of 600Hz tone burst when any key is pressed in the pulse mode or when a function key is pressed in the tone mode. Pulled-high, this pin is a Schmitt trigger input structure. Active low. Applying a negative going pulse to HFI can toggle the HFO once and hence control the hand-free function. The pull-high resistance of HFI is about 200kW typ. An external RC network is recommended for input debouncing. The HFO pin is a CMOS output structure. Its output is toggle- controlled by a negative transition on HFI pin. When HFO is high, the hand-free function is enabled and PO outputs a high to connect the line. The hand-free function can be released by an on-off-hook operation or by another HFI input. Refer to the functional description for the hand-free functional operation. Positive power supply, 2.0V~5.5V for normal operation Negative power supply, ground NMOS open drain output pin pulled to VSS during tone output and is an open circuit during pulse output.
C1~C3 R1~R4
I/O
CMOS I/O
X1 X2
I O OSC
XMUTE
O
NMOS Open Drain
HKS
I
CMOS
PO
O
NMOS
MODE
I/O
CMOS
DTMF
O
CMOS
KT
O
NMOS
HFI
I
CMOS
HFO
O
CMOS
VDD VSS MODEO
3/4 3/4 O
3/4 3/4 NMOS
Rev. 1.10
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October 2, 2002
HT93214 Series
Approximate internal connection circuits
C M O S IN P u ll- H ig h
C M O S IN /O U T
V
DD
NMOS OUT
C M O S IN
CMOS OUT
V
DD
C M O S IN P u ll- L o w
O S C IL L A T O R
X1 20P 10M X2
10P EN
Absolute Maximum Ratings
Supply Voltage ............................................-0.3V to 6V Input Voltage..............................VSS-0.3V to VDD+0.3V Storage Temperature ............................-50C to 125C Operating Temperature...........................-20C to 75C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum 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 exposure to extreme conditions may affect device reliability.
Electrical Characteristics
Symbol VDD IDD ISTB VR IR VIL VIH IXMO IOLXM IHKS RHFI IOH1 IOL1 IOH2 IOL2 IOL3 Parameter Operating Voltage Operating Current Standby Current Memory Retention Voltage Memory Retention Current Input Low Voltage Input High Voltage XMUTE Leakage Voltage XMUTE Sink Current HKS Pin Input Current HFI Pull- High Resistance Keypad Pin Source Current Keypad Pin Sink Current HFO Pin Source Current HFO Pin Sink Current MODEO Sink Current Test Conditions VDD 3/4 2.5V 1V 3/4 1V 3/4 3/4 3/4 On-hook 3/4 3/4 VXMUTE=12V No entry Pulse Tone Conditions 3/4 Off-hook Keypad entry Min. 2 3/4 3/4 3/4 1 3/4 VSS 0.8VDD 3/4 1 3/4 3/4 -4 200 -1 1 0.6
FOSC=3.5795MHz, Ta=25C Typ. 3/4 0.2 0.6 3/4 3/4 0.1 3/4 3/4 3/4 3/4 200 3/4 400 3/4 3/4 3.5 Max. 5.5 1 2 1 5 0.2 0.2VDD VDD 1 3/4 0.1 3/4 -40 3/4 3/4 3/4 3/4 Unit V mA mA mA V mA V V mA mA mA kW mA mA mA mA mA
On-hook, no load No entry 3/4
2.5V VXMUTE=0.5V 2.5V VHKS=2.5V 2.5V VHFI=0V 2.5V VOH=0V 2.5V VOL=2.5V 2.5V VOH=2V 2.5V VOL=0.5V 2.5V VOL=0.5V
Rev. 1.10
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October 2, 2002
HT93214 Series
Symbol TFP TRP FOSC TDB TBRK THKDL Parameter Pause Time After Flash One-key Redialing Pause Time System Frequency Key-in Debounce Time Test Conditions VDD 2.5V 2.5V 3/4 2.5V Conditions 3/4 3/4 3/4 3/4 3/4 10pps 20pps Min. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Typ. 800 800 3.58 20 2.2 800 500 Max. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Unit ms ms MHz ms s ms
Break Time For One-key Redialing 2.5V Off-hook Delay Time 2.5V
Pulse Mode Electrical Characteristics
Symbol IPOH IPOL PR M/B TPDP TIDP TM TB TP Parameter PO Output Source Current PO Output Sink Current Pulse Rate Make/Break Ratio Pre-digit-pause Time Test Conditions VDD Conditions 2.5V VOH=2V 2.5V VOL=0.5V 3/4 3/4 3/4 3/4 3/4 3/4 3/4 MODE pin is connected to VDD MODE pin is opened 3/4 M/B=33:66 (10 pps) M/B=33:66 (20 pps) 10 pps 20 pps 10 pps, M/B=1/2 20 pps, M/B=1/2 10 pps, M/B=1/2 20 pps, M/B=1/2 3/4 Min. -0.2 0.2 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4
FOSC=3.5795MHz, Ta=25C Typ. 3/4 0.6 10 20 33:66 33 17 800 500 33.3 16.7 66.6 33.3 2.2 Max. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 % ms Unit mA mA pps
Inter-digit-pause Time
ms
Pulse Make Duration
ms
Pulse Break Duration Pause Time
ms s
Tone Mode Electrical Characteristics
Symbol VTDC ITOL VTAC RL ACR THD TTMIN TITPM Parameter DTMF Output DC Level DTMF Sink Current DTMF Output AC Level DTMF Output Load Column Pre-emphasis Tone Signal Distortion Minimum Tone Duration Minimum Inter-Tone Pause Test Conditions VDD 3/4 Conditions No load Min. 0.45VDD 0.1 0.12 5 1 3/4 3/4 3/4
FOSC=3.5795MHz, Ta=25C Typ. 3/4 3/4 0.155 3/4 2 -30 94 96 Max. 0.7VDD 3/4 0.18 3/4 3 -23 3/4 3/4 Unit V mA Vrms kW dB dB ms ms
2.5V VDTMF=0.5V 3/4 Row group, RL=5kW
2.5V THD-23dB 2.5V Row group=0dB 2.5V RL=5kW 3/4 3/4 Auto-redial Auto-redial
THD (Distortion) (dB) = 20 log ( V12 + V22 + ....+ Vn2 / Vi2 + Vh2 ) Vi, Vh: Row group and column group signals V1, V2, ... Vn: Harmonic signals (BW=300Hz~3500Hz)
Rev. 1.10
5
October 2, 2002
HT93214 Series
Functional Description
Keyboard matrix C1~C3, HKS and R1~R4 form a keyboard matrix. Together with a standard 44 keyboard, the keyboard matrix is used for dialing entries. The keyboard arrangement of the HT93214 series is shown in the Keyboard Information. Tone frequency Tone Name R1 R2 R3 R4 C1 C2 C3 Output Frequency (Hz) Specified 697 770 852 941 1209 1336 1477 Actual 699 766 847 948 1215 1332 1472 % Error +0.29% -0.52% -0.59% +0.74% +0.50% -0.30% -0.34% Flash Two flash keys are provided, namely F1, F2 for both series. All the flash key function as control key with different break duration. Whenever a flash key is pressed the PO pin will be forced low for a TF duration and the transmission of the new digit key inputs will be further delayed for a TFP after TF. See the following table for flash duration selection. Item HT93214 Key definition
* 0,1,2,3,4,5,6,7,8,9 keys
F1 300ms
F2 600ms
These are dialing number input keys for both the pulse mode and the tone mode operation.
* */T
Note: % Error does not contain the crystal frequency drift Dialing specification selection
* The specifications are selected by the MODE pin.
This key executes the P(R)T function and waits a TP(R)T duration in the pulse mode. On the other hand, the */T key executes the * function in the tone mode. The */T key will occupy one memory digit in either tone or pulse mode.
*#
MODE VDD VSS Floating
Tone/Pulse Pulse Tone Pulse
Dial Rate 10pps 3/4 20pps
M/B Ratio 1/2 3/4 1/2
This is a dialing signal key for the tone mode only, no response in the pulse mode.
* F1, F2
* The MODE pin status is checked whenever a digit key
is pressed, however the M/B and pulse rate are determined at the first key entry. Hand-free function operation
* When HFO is low, a falling edge triggers the HFI, en-
Pressing one of the flash keys will force the PO pin to become low for the TF duration. To transmit the dial signals of the key input that are entered after the F key, a wait period TFP (sec) after PO pin returns from low is provided.
*P
Pause key. The execution of this key pauses the output for the TP duration (2.2s).
*R
abling the Hand-free function (HFO becomes high).
* Reset Hand-free function
Redial key. It executes redialing as well as one-key redial function.
When HFO is high, the Hand-free function is enabled and can be reset by:

Off-hook Applying a falling edge to HFI
* Hand-free function table
Current State Hook SW 3/4 On-hook Off-hook On-hook Off-hook Off-hook HFO Low High High 3/4 Low High Input HFI HFI HFI of off-hook on-hook on-hook
Next State HFO High Low Low Low Low High Dialing? Yes No Yes Yes No Yes
Rev. 1.10
6
October 2, 2002
HT93214 Series
Keyboard Operation The following operations are described under an on-off- hook or on-hook condition with the hand-free active condition.
* N o r m a l d ia lin g P u ls e m o d e ( a ) w ith o u t * /T Tone m ode ( a ) w ith o u t * /T
K e y b o a r d in p u t: D 1
D ia lin g o u tp u t: D 1 RM :D1 D 2 ... D n
D2
... D n
K e y b o a r d in p u t: D 1
D ia lin g o u tp u t: D 1 RM :D1 D 2 ... D n
D2
... D n
D 2 ... D n
D 2 ... D n
( b ) w ith * /T K e y b o a r d in p u t: D ia lin g o u tp u t: D 1 R M :D 1 D 2 ... D n
D1 Dm
D2
... D n
* /T
D n+1
...
( b ) w ith * /T K e y b o a r d in p u t: D ia lin g o u tp u t: D 1 R M :D 1 D 2 ... D n
D1 Dm
D2
... D n
* /T
D n+1
...
D 2 ... D n T P (R) T P u ls e * /T D n + 1 ... D m
D n + 1 ... D m Tone
D 2 ... D n
* D n + 1 ... D m
* D n + 1 ... D m
N o te : T h e m a x im u m c a p a c ity o f th e R M m e m o r y is 3 2 d ig its . W h e n m o r e th a n 3 2 d ig its a r e e n te r e d , th e s ig n a l is tr a n s m itte d b u t th e r e d ia l fu n c tio n is in h ib ite d .
* R e d ia l P u ls e m o d e D 2 ... D n R D 2 ... D n ( a ) w ith o u t * /T RM c o n te n t: D 1 K e y b o a r d in p u t: D ia lin g o u tp u t: D 1 R M :U nchanged ( b ) w ith * /T R M c o n te n t: D 1 K e y b o a r d in p u t: D ia lin g o u tp u t: D 1 R M :U nchanged Tone m ode ( a ) w ith o u t * /T RM c o n te n t: D 1 D 2 ... D n R D 2 ... D n K e y b o a r d in p u t: D ia lin g o u tp u t: D 1 R M :U nchanged ( b ) w ith * /T D 2 ... D n R D 2 ... D n P u ls e T
P(R) T
* /T
D n + 1 ... D m D n + 1 ... D m Tone
RM
c o n te n t: D 1
D 2 ... D n R
* /T
D n + 1 ... D m * D n + 1 ... D m
K e y b o a r d in p u t: D ia lin g o u tp u t: D 1 R M :U nchanged
D 2 ... D n
Rev. 1.10
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October 2, 2002
HT93214 Series
* O n e - k e y r e d ia l P u ls e m o d e ( a ) w ith o u t * /T Tone m ode ( a ) w ith o u t * /T
K e y b o a r d in p u t: D 1
D2
... D n
BRK
R
T
RP
K e y b o a r d in p u t: D 1
D2
... D n
T
BRK
R
T
RP
D ia lin g o u tp u t: D 1 D 2 ... D n T D 1 D 2 ... D n R M : D 1 D 2 ... D n ( b ) w ith * /T K e y b o a r d in p u t: D 1
D ia lin g o u tp u t: D 1 D 2 ... D n ... D n R M : D 1 D 2 ... D n ( b ) w ith * /T K e y b o a r d in p u t: D 1
D1
D2
D2 R
... D n
* /T
D n+1
...
D2 R
... D n
* /T
D n+1
...
Dm
D ia lin g o u tp u t: D 1
Dm
D ia lin g o u tp u t: D 1 T R M :D 1 D 2 ... D n
BRK
R M :D 1
D 2 . . . D n T P (R) T D n + 1 ... D m P u ls e Tone T B R K T R P D 1 D 2 ... D n T P (R) T P u ls e D n + 1 ... D m Tone D 2 ... D n * /T D n + 1 ... D m
D 2 ... D n T
RP
* D n + 1 ... D m D 2 ... D n * D n+1
... D m
D1
* D n + 1 ... D m
N o te : If th e d ia lin g n u m b e r e x c e e d s 3 2 d ig its , r e d ia lin g is in h ib ite d a n d P O = o p e n
* . la s h . la s h a s a c o n tr o l k e y
* P ause K e y b o a r d in p u t: D1 P D2 ... D n T
P
P
Dn+1
... D m
K e y b o a r d in p u t:
D1 Dm
D2
... D n
T
.
.
T
.P
D n+1
D n + 1 ...
...
D ia lin g o u tp u t: D 1 RM :D1 D 2 ... D n
D 2 ... D n
D n + 1 ... D m
D n + 1 ... D m
D ia lin g o u tp u t: D 1 D 2 ... D n Dm R M : D n + 1 ... D m N o te : T
.
* N o te R M : R e d ia l m e m o r y D 1 D 2 ... D n : 0 ~ 9 D n + 1 ... D m : 0 ~ 9 , * , #
: b r e a k a fla s h tim e
Rev. 1.10
8
October 2, 2002
HT93214 Series
Timing Diagrams
Normal dialing
* Pulse mode
H ig h Im p e d a n c e HKS
K E Y IN
D1 T
DB
D2 R T
DB
T
DB
XM UTE T T
PO
ID P
-T
M
PDP
T
ID P
-T
M
T
ID P
-T
M
T
PDP
T
ID P
T
M
T
B
T
M
T
M
DTM . KT T X2 20m s 20m s
KT
T
KT
T
KT
6 0 0 H z c a r r ie r
T
ID P
-T
M
* Tone mode
H ig h Im p e d a n c e HKS
K E Y IN
D1 T
DB
D2 T
DB
R T
DB
XM UTE
PO T DTM . T KT
T M IN IT P M
T
IT P M
T
IT P M
T
IT P M
X2 20m s MODEO 20m s
Rev. 1.10
9
October 2, 2002
HT93214 Series
Dialing with PAUSE key
* Pulse mode
H ig h Im p e d a n c e HKS
K E Y IN T XM UTE
DB
D1
D2 P
D3 T
P
+T
PDP
T
ID P
-T
M
T
ID P
-T
M
T PO DTM . KT T X2 20m s
PDP
T
ID P
T
M
T
M
T
ID P
-T
M
KT
T
KT
6 0 0 H z c a r r ie r
* Tone mode
H ig h Im p e d a n c e HKS
K E Y IN
D1 T
DB
D2
P
D3 T
P
XM UTE
PO T DTM . T KT
IT P M T M IN
T
IT P M
T
IT P M
X2 20m s MODEO
Rev. 1.10
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October 2, 2002
HT93214 Series
* Flash key operation
H ig h Im p e d a n c e HKS
K E Y IN .
T XM UTE
DB
PO T
.
T
.P
DTM . KT T X2 20m s
KT
6 0 0 H z c a r r ie r
* Pulse to Tone operation
H ig h Im p e d a n c e HKS
K E Y IN T XM UTE
DB
D1
D2
* /T
D3 T
ID P
T
P
(R)
T
T PO
PDP
T
ID P
+T
PDP
T
IT P M
DTM . T KT T X2 20m s MODEO
KT T M IN
1 .2 k H z c a r r ie r 6 0 0 H z c a r r ie r
Rev. 1.10
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October 2, 2002
HT93214 Series
* One key redial operation
H ig h Im p e d a n c e HKS
K E Y IN
D1 T
DB
D2 T T
IT P M DB
R T T
IT P M DB
T
IT P M
XM UTE
PO T DTM . KT T X2 20m s MODEO
KT BRK
T
RP
T
IT P M
Rev. 1.10
12
October 2, 2002
HT93214 Series
T ip A92 O ff-h o o k 100kW 2 .2 k W 3 .3 k W A42 V
DD
22M W 100kW
O n -h o o k
R in g
1 A b r id g e
SPEECH NETW ORK 1N4148 1 .5 k W 220kW 150W 1m.
H A N D -. R E E NETW ORK
H.O 1N4148 5 .1 V 100m. 270kW 47kW 0 .1 m .
V 1m. 100kW
DD
1 .1
2 3
R1 R2 R3 R4
C3 C2 C1
PO
VDD
HKS
DTM .
XM UTE
H.O
MODEO
4 .2 9 P # R 0 7 * /T 8
5 6
H T 9 3 2 1 4 S e r ie s
VSS
MODE V
DD
X1 M /B = 2 /3 M /B = 1 /2
X2 3 .5 8 M H z re s o n a to r 10p. Tone 39p. 39p.
H.I
KT V
DD
Application Circuits
* U n s p e c ifie d tr a n s is to r s a r e o f 8 0 5 0 ty p e * A m . c a p a c ito r b e tw e e n X M U T E a n d V S S ( G N D ) is r e c o m m e n d e d
Rev. 1.10
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October 2, 2002
HT93214 Series
Package Information
16-pin DIP (300mil) outline dimensions
A 16 B 1 9 8
H C D E . G
a
I
Symbol A B C D E F G H I a
Dimensions in mil Min. 745 240 125 125 16 50 3/4 295 335 0 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 100 3/4 3/4 3/4 Max. 775 260 135 145 20 70 3/4 315 375 15
Rev. 1.10
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October 2, 2002
HT93214 Series
18-pin DIP (300mil) outline dimensions
A 18 B 1 10 9
H C D E G .
a
I
Symbol A B C D E F G H I a
Dimensions in mil Min. 895 240 125 125 16 50 3/4 295 335 0 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 100 3/4 3/4 3/4 Max. 915 260 135 145 20 70 3/4 315 375 15
Rev. 1.10
15
October 2, 2002
HT93214 Series
Holtek Semiconductor Inc. (Headquarters) No.3, Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan Tel: 886-3-563-1999 Fax: 886-3-563-1189 http://www.holtek.com.tw Holtek Semiconductor Inc. (Sales Office) 11F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan Tel: 886-2-2782-9635 Fax: 886-2-2782-9636 Fax: 886-2-2782-7128 (International sales hotline) Holtek Semiconductor (Shanghai) Inc. 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn 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 Holmate Semiconductor, Inc. 48531 Warm Springs Boulevard, Suite 413, Fremont, CA 94539 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com Copyright O 2002 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 present 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.
Rev. 1.10
16
October 2, 2002

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