HT93214 Series 1-memory Tone/Pulse Dialer Patent Number: 86474, 84545(R.O.C) Features · Operating Voltage: 2.0V~5.5V · Pause, P ® T can be saved for redialing · Low standby current · One-key redialing · Low memory retention current: 0.1mA (Typ.) · Keytone output · Tone/Pulse switchable · Pause time: 2.2s · 32 (pulse)/31 (tone) digits for redialing · Cascadable manual dialing after redialing · Pause and P ® T key for PBX · Calibrated DTMF timing for redialing · 4´4 keyboard matrix · HT93214A: 16-pin DIP package HT93214B/AT: 18-pin DIP package · 3.58MHz crystal or ceramic resonator · Hand-free control General Description ing. 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. 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 4´4 keyboard, it performs normal tone/pulse switchable dialing, and provides one-key redialing function with a 32-digit memory for speed dial- Selection Table HT93214 series Function HandFree Part No. Key Tone HT93214A HT93214B HT93214AT Rev. 1.10 Ö Ö Inter Tone Pulse Tone Duration No. Pause (ms) (ms) PPS M/B PKG DIP 300mil 96 10/20 1/2 16 94 96 10/20 1/2 18 94 96 10/20 1/2 18 Flash Flash Time (ms) Control 300/600 N 94 Control 300/600 N Control 300/600 N 1 October 2, 2002 HT93214 Series Block Diagram F S M C 1 C o n tro l C h e c k K e y C o lu m n K e y F u n c tio n E n c o d e r C 3 W R M C o u n te r S R A M A D D R L R 1 R 4 D iv id e r X 2 T o n e O u t C o n v e rte r P u ls e O u t D T M F P O X M U T E E n c o d e r K e y R o w X 1 T o n e E n c o d e r D e b o u n c e C lo c k C o n tro l C lo c k G e n e ra to r M /B H K S H F I H F F la s h /M o d e H F O M O D E O M O D E T im e r K e y to n e G e n e ra to r K T Pin Assignment H F O 1 1 8 H F I H K S 1 1 6 R 4 H K S 2 1 7 R 4 M O D E 2 1 5 R 3 M O D E 3 1 6 R 3 X 1 3 1 4 R 2 X 1 4 1 5 R 2 X 2 4 1 3 R 1 X 2 5 1 4 R 1 V S S 5 1 2 C 3 V S S 6 1 3 C 3 V D D 6 1 1 C 2 V D D 7 1 2 C 2 D T M F 7 1 0 C 1 D T M F 8 1 1 C 1 X M U T E 8 9 P O X M U T E 9 1 0 P O H T 9 3 2 1 4 A 1 6 D IP -A H T 9 3 2 1 4 B 1 8 D IP -A H K S 1 1 8 R 4 M O D E 2 1 7 R 3 X 1 3 1 6 R 2 X 2 4 1 5 R 1 V S S 5 1 4 C 3 V D D 6 1 3 C 2 D T M F 7 1 2 C 1 X M U T E 8 1 1 P O M O D E O 9 1 0 K T H T 9 3 2 1 4 A T 1 8 D IP -A Keyboard Information C 1 C 2 C 3 H K S R 1 1 2 3 F 1 R 2 4 5 6 F 2 R 3 7 8 9 P R 4 * /T 0 # Rev. 1.10 R 2 October 2, 2002 HT93214 Series Pin Description Pin Name C1~C3 R1~R4 I/O I/O X1 I X2 O XMUTE O HKS PO MODE I O I/O Internal Connection Description CMOS I/O These pins along with the HKS form a 4´4 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. OSC 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 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. CMOS 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 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. CMOS 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. DTMF O CMOS 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. KT O NMOS 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. CMOS 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. HFI I HFO O CMOS VDD ¾ ¾ Positive power supply, 2.0V~5.5V for normal operation VSS ¾ ¾ Negative power supply, ground MODEO O NMOS Rev. 1.10 NMOS open drain output pin pulled to VSS during tone output and is an open circuit during pulse output. 3 October 2, 2002 HT93214 Series Approximate internal connection circuits C M O S IN /O U T V N M O S O U T C M O S IN V C M O S IN P u ll- L o w C M O S IN P u ll- H ig h C M O S O U T D D D D O S C IL L A T O R X 2 X 1 2 0 P 1 0 M 1 0 P E N Absolute Maximum Ratings Supply Voltage ............................................-0.3V to 6V Storage Temperature ............................-50°C to 125°C Input Voltage..............................VSS-0.3V to VDD+0.3V Operating Temperature...........................-20°C to 75°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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 Parameter Operating Voltage Operating Current FOSC=3.5795MHz, Ta=25°C Test Conditions VDD Conditions ¾ 2.5V ¾ Pulse Tone ISTB Standby Current VR Memory Retention Voltage ¾ IR Memory Retention Current 1V VIL Input Low Voltage ¾ VIH Input High Voltage ¾ IXMO XMUTE Leakage Voltage ¾ IOLXM IHKS 1V Off-hook Keypad entry On-hook, no load No entry ¾ Min. Typ. Max. Unit 2 ¾ 5.5 V ¾ 0.2 1 mA ¾ 0.6 2 mA ¾ ¾ 1 mA 1 ¾ 5 V ¾ 0.1 0.2 mA ¾ VSS ¾ 0.2VDD V ¾ 0.8VDD ¾ VDD V VXMUTE=12V No entry ¾ ¾ 1 mA XMUTE Sink Current 2.5V VXMUTE=0.5V 1 ¾ ¾ mA ¾ 0.1 mA On-hook HKS Pin Input Current 2.5V VHKS=2.5V RHFI HFI Pull- High Resistance 2.5V VHFI=0V ¾ 200 ¾ kW IOH1 Keypad Pin Source Current 2.5V VOH=0V -4 ¾ -40 mA IOL1 Keypad Pin Sink Current 2.5V VOL=2.5V 200 400 ¾ mA IOH2 HFO Pin Source Current 2.5V VOH=2V -1 ¾ ¾ mA IOL2 HFO Pin Sink Current 2.5V VOL=0.5V 1 ¾ ¾ mA IOL3 MODEO Sink Current 2.5V VOL=0.5V 0.6 3.5 ¾ mA Rev. 1.10 4 October 2, 2002 HT93214 Series Symbol Parameter Test Conditions Min. Typ. Max. Unit ¾ 800 ¾ ms VDD Conditions Pause Time After Flash 2.5V ¾ TRP One-key Redialing Pause Time 2.5V ¾ ¾ 800 ¾ ms FOSC System Frequency ¾ ¾ ¾ 3.58 ¾ MHz TDB Key-in Debounce Time 2.5V ¾ ¾ 20 ¾ ms TBRK Break Time For One-key Redialing 2.5V ¾ ¾ 2.2 ¾ s THKDL Off-hook Delay Time 10pps ¾ 800 ¾ 20pps ¾ 500 ¾ TFP 2.5V Pulse Mode Electrical Characteristics Symbol Parameter ms FOSC=3.5795MHz, Ta=25°C Test Conditions VDD Conditions Min. Typ. Max. Unit IPOH PO Output Source Current 2.5V VOH=2V -0.2 ¾ ¾ mA IPOL PO Output Sink Current 2.5V VOL=0.5V 0.2 0.6 ¾ mA PR Pulse Rate MODE pin is connected to VDD ¾ 10 ¾ MODE pin is opened ¾ 20 ¾ ¾ 33:66 ¾ ¾ M/B Make/Break Ratio ¾ TPDP Pre-digit-pause Time ¾ TIDP Inter-digit-pause Time ¾ TM Pulse Make Duration ¾ TB Pulse Break Duration ¾ TP Pause Time ¾ ¾ M/B=33:66 (10 pps) ¾ 33 ¾ M/B=33:66 (20 pps) ¾ 17 ¾ 10 pps ¾ 800 ¾ 20 pps ¾ 500 ¾ 10 pps, M/B=1/2 ¾ 33.3 ¾ 20 pps, M/B=1/2 ¾ 16.7 ¾ 10 pps, M/B=1/2 ¾ 66.6 ¾ 20 pps, M/B=1/2 ¾ 33.3 ¾ ¾ 2.2 ¾ ¾ Tone Mode Electrical Characteristics Symbol Parameter VTDC DTMF Output DC Level ITOL DTMF Sink Current VTAC DTMF Output AC Level pps % ms ms ms ms s FOSC=3.5795MHz, Ta=25°C Test Conditions VDD Conditions Min. Typ. Max. Unit 0.45VDD ¾ 0.7VDD V 2.5V VDTMF=0.5V 0.1 ¾ ¾ mA Row group, RL=5kW 0.12 0.155 0.18 Vrms ¾ ¾ No load RL DTMF Output Load 2.5V THD£-23dB 5 ¾ ¾ kW ACR Column Pre-emphasis 2.5V Row group=0dB 1 2 3 dB 2.5V RL=5kW THD Tone Signal Distortion ¾ -30 -23 dB TTMIN Minimum Tone Duration ¾ Auto-redial ¾ 94 ¾ ms TITPM Minimum Inter-Tone Pause ¾ Auto-redial ¾ 96 ¾ ms 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 Flash C1~C3, HKS and R1~R4 form a keyboard matrix. Together with a standard 4´4 keyboard, the keyboard matrix is used for dialing entries. The keyboard arrangement of the HT93214 series is shown in the Keyboard Information. 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. Tone frequency Output Frequency (Hz) Tone Name Specified Actual R1 697 699 +0.29% R2 770 766 -0.52% Key definition R3 852 847 -0.59% · 0,1,2,3,4,5,6,7,8,9 keys Item F1 F2 HT93214 300ms 600ms % Error R4 941 948 +0.74% C1 1209 1215 +0.50% C2 1336 1332 -0.30% C3 1477 1472 -0.34% These are dialing number input keys for both the pulse mode and the tone mode operation. · */T This key executes the P®T function and waits a TP®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. Note: % Error does not contain the crystal frequency drift Dialing specification selection · # · The specifications are selected by the MODE pin. MODE Tone/Pulse Dial Rate M/B Ratio VDD Pulse 10pps 1/2 VSS Tone ¾ ¾ Floating Pulse 20pps 1/2 This is a dialing signal key for the tone mode only, no response in the pulse mode. · F1, F2 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. · 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. · P Pause key. The execution of this key pauses the output for the TP duration (2.2s). Hand-free function operation · When HFO is low, a falling edge triggers the HFI, en- · R abling the Hand-free function (HFO becomes high). Redial key. It executes redialing as well as one-key redial function. · Reset Hand-free 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 Next State Hook SW HFO Input HFO Dialing? ¾ Low HFI ¯ High Yes On-hook High HFI ¯ Low No Off-hook High HFI ¯ Low Yes ¾ of off-hook Low Yes Off-hook Low on-hook Low No Off-hook High on-hook High Yes On-hook 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 T o n e m o d e P u ls e m o d e - - ( a ) w ith o u t * /T ( a ) w ith o u t * /T K e y b o a r d in p u t: D 1 D 2 D ia lin g o u tp u t: D 1 R M : D 1 ... D n K e y b o a r d in p u t: D 1 D 2 ... D n D 2 ... D n R M : D 1 ( b ) w ith * /T K e y b o a r d in p u t: D 1 D 2 ... D n * /T D n + 1 D 2 ... D n ( b ) w ith * /T K e y b o a r d in p u t: ... R M : D 1 D 1 D 2 ... D n * /T D n + 1 ... D m D 2 ... D n T P ® T P u ls e * /T D n + 1 ... D m D 2 ... D n ... D n D 2 ... D n D m D ia lin g o u tp u t: D 1 D 2 D ia lin g o u tp u t: D 1 D ia lin g o u tp u t: D 1 D n + 1 ... D m T o n e R M : D 1 D 2 ... D n 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 - ( a ) w ith o u t * /T R M c o n te n t: D 1 R M D 2 ... D n K e y b o a r d in p u t: R R D 2 ... D n R M : U n c h a n g e d ( b ) w ith * /T 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 Rev. 1.10 D 2 ... D n D ia lin g o u tp u t: D 1 D 2 ... D n R M : U n c h a n g e d R M : U n c h a n g e d 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 ( b ) w ith * /T R M c o n te n t: D 1 T o n e m o d e ( a ) w ith o u t * /T * /T D n + 1 ... D m R M R c o n te n t: D 1 D 2 ... D n K e y b o a r d in p u t: D 2 ... D n P u ls e T P ® T D n + 1 ... D m T o n e D ia lin g o u tp u t: D 1 * /T D n + 1 ... D m R D 2 ... D n * D n + 1 ... D m R M : U n c h a n g e d 7 October 2, 2002 HT93214 Series · O n e - k e y r e d ia l P u ls e m o d e - T o n e m o d e - ( a ) w ith o u t * /T ( a ) w ith o u t * /T K e y b o a r d in p u t: D 1 D 2 ... D n 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 2 D m R R K e y b o a r d in p u t: D 1 T B R K ... D n * /T D n + 1 ... ( b ) w ith * /T K e y b o a r d in p u t: D 1 D 2 D m R D ia lin g o u tp u t: D 1 D 2 . . . D n T P ® T D n + 1 ... D m P u ls e T o n e T B R K T R P D 1 D 2 ... D n T P ® T P u ls e D n + 1 ... D m T o n e D 2 ... D n * /T D n + 1 ... D m D ia lin g o u tp u t: D 1 R M : D 1 D 2 ... D n 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 R P T R M : D 1 T ... D m R T B R K ... D n D 2 ... D n B R K D 2 ... D n T R P R P * /T D 1 D 2 D n + 1 ... * D n + 1 ... D m D 1 D 2 ... D n * D n + 1 * 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 · P a u s e · F la s h - K e y b o a r d in p u t: F la s h a s a c o n tr o l k e y K e y b o a r d in p u t: D 1 D m D 2 ... D n D ia lin g o u tp u t: D 1 D 2 ... D n D m R M : D n + 1 ... D m N o te : T F F D n + 1 R M : D 1 T F T F P D 1 D ia lin g o u tp u t: D 1 ... D 2 ... D n D 2 ... D n D 2 ... D n P T P P D n + 1 ... D m D n + 1 ... D m D n + 1 ... D m D n + 1 ... · N o te : b r e a k a fla s h tim e 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 , * , # 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 H K S K E Y IN D 1 D 2 T T R D B T D B D B X M U T E T T T P D P -T ID P T M ID P -T M T T P D P ID P -T M T ID P M P O T T B T M M D T M F K T T T K T T K T 6 0 0 H z c a r r ie r K T T ID P -T M X 2 2 0 m s 2 0 m s · Tone mode H ig h Im p e d a n c e H K S K E Y IN D 1 R T D 2 T D B T D B D B X M U T E P O T IT P M T T IT P M IT P M D T M F T T M IN T IT P M K T X 2 2 0 m s 2 0 m s M O D E O 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 H K S K E Y IN T D 1 D 2 D 3 P D B T P + T P D P X M U T E T T T P D P ID P - T T M T ID P - T ID P M T M M P O D T M F T K T T T K T K T ID P -T M 6 0 0 H z c a r r ie r X 2 2 0 m s · Tone mode H ig h Im p e d a n c e H K S K E Y IN D 1 D 2 T P D 3 T D B P X M U T E P O T T M IN T T IT P M IT P M D T M F T IT P M K T X 2 2 0 m s M O D E O Rev. 1.10 10 October 2, 2002 HT93214 Series · Flash key operation H ig h Im p e d a n c e H K S K E Y IN F T D B X M U T E P O T T F F P D T M F K T T K T 6 0 0 H z c a r r ie r X 2 2 0 m s · Pulse to Tone operation H ig h Im p e d a n c e H K S K E Y IN T D 1 * /T D 2 D 3 T D B T ID P P ® T X M U T E T P D P T ID P + T P D P P O T IT P M D T M F T K T T M IN 1 .2 k H z c a r r ie r T K T 6 0 0 H z c a r r ie r X 2 2 0 m s M O D E O Rev. 1.10 11 October 2, 2002 HT93214 Series · One key redial operation H ig h Im p e d a n c e H K S K E Y IN D 1 T D 2 T D B T X M U T E R IT P M T D B T T D B IT P M IT P M P O T B R K T R P T IT P M D T M F K T T K T X 2 2 0 m s M O D E O Rev. 1.10 12 October 2, 2002 HT93214 Series Application Circuits T ip 3 6 9 P F 2 F 1 R in g 2 5 8 # H F O 1 4 7 0 R * /T 1 A b r id g e R 1 R 2 R 3 R 4 P O 2 2 M W C 1 4 7 k W C 2 1 0 0 k W C 3 O ff-h o o k A 9 2 3 .3 k W A 4 2 1 0 0 k W V S S V D D M O D E 1 0 p F 2 .2 k W D D 0 .1 m F 1 N 4 1 4 8 V D D V M /B = 2 /3 M /B = 1 /2 T o n e 5 .1 V 3 9 p F * 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 F 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 X 1 H K S 2 2 0 k W 1 m F H T 9 3 2 1 4 S e r ie s 2 7 0 k W 1 N 4 1 4 8 1 0 0 m F X 2 3 .5 8 M H z re s o n a to r 3 9 p F 1 0 0 k W 1 .5 k W D T M F 1 5 0 W X M U T E S P E E C H N E T W O R K 1 m F K T V M O D E O H A N D -F R E E N E T W O R K H F O H F I D D V D D October 2, 2002 13 Rev. 1.10 O n -h o o k HT93214 Series Package Information 16-pin DIP (300mil) outline dimensions A B 1 6 9 8 1 H C D a G E I F Symbol A Rev. 1.10 Dimensions in mil Min. Nom. Max. 745 ¾ 775 B 240 ¾ 260 C 125 ¾ 135 D 125 ¾ 145 E 16 ¾ 20 F 50 ¾ 70 G ¾ 100 ¾ H 295 ¾ 315 I 335 ¾ 375 a 0° ¾ 15° 14 October 2, 2002 HT93214 Series 18-pin DIP (300mil) outline dimensions A B 1 8 1 0 1 9 H C D E a G I F Symbol Rev. 1.10 Dimensions in mil Min. Nom. Max. A 895 ¾ 915 B 240 ¾ 260 C 125 ¾ 135 D 125 ¾ 145 E 16 ¾ 20 F 50 ¾ 70 G ¾ 100 ¾ H 295 ¾ 315 I 335 ¾ 375 a 0° ¾ 15° 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 Ó 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