W91590 SERIES 24-MEMORY TONE/PULSE SWITCHABLE DIALER WITH HANDFREE, HOLD AND LOCK FUNCTIONS GENERAL DESCRIPTION The W91590 series dialers Si-gate CMOS IC tone/pulse switchable dialers with a 24-channel automatic dialing memory, including a 16-digit × 3 emergency dialing memory, a 16-digit × 20 channel repertory memory that provides one-touch and three-touch dialing, and a 32-digit mercury memory. These dialers also provide flash, clear, hold, and one-key redial functions. FEATURES • DTMF/Pulse switchable dialer • 32-digit LNB (last number buffer) memory (both tone and pulse mode) • 32-digit mercury memory (tone/pulse mode) • 16-digit × 3 one-touch direct repertory memory (tone/pulse mode) • 16-digit × 20 direct or indirect repertory memory (tone/pulse mode) • Uses 9 × 5 keyboard • Flash time: 98 mS, 305 mS, or 600 mS (selectable by keypad option) • Pause time: 3.6 sec. • Pause P→T (pulse-to-tone) can be stored as a digit in memory • Minimum tone output duration: 93 mS • Minimum intertone pause: 93 mS • On-chip power-on reset • Uses 3.579545 MHz crystal or ceramic resonator • Packaged in 22, 24 or 28-pin plastic DIP • The different dialers in the W91590 series are shown in the following table: TYPE NO. PULSE MEMORY (ppS) MERCURY MEMORY HOLD HANDFREE LOCK PACKAGE FUNCTION W91590 10 20 - - - - 22 W91590L 10 20 - - - Yes 22 W91590A 10 20 - - Yes - 24 W91590AL 10 20 - - Yes Yes 24 W91590B 10/20 24 Yes Yes Yes - 28 W91590BL 10/20 24 Yes Yes Yes Yes 28 W91590C 10/20 24 Save Memory Yes Yes - 28 W91590CL 10/20 24 Save Memory Yes Yes Yes 28 -1- Publication Release Date: July 1995 Revision A3 W91590 SERIES PIN CONFIGURATIONS C1 1 24 R5 C1 1 22 R5 C2 2 23 R4 C2 2 21 R4 C3 3 22 R3 C3 3 20 R3 C4 4 21 R2 C4 4 19 R2 C5 5 20 R1 C5 5 18 R1 C6 6 19 NC C6 6 17 NC C7 7 18 VDD 16 V DD C7 V SS 7 8 15 MODE XT 9 14 DTMF XT 10 13 DP/C9 T/P MUTE 11 12 HKS VSS XT XT T/P MUTE HFI 8 17 9 16 10 15 11 14 12 W91590 13 MODE DTMF DP/C9 HKS HFO C1 C1 1 22 C2 2 21 R4 1 24 R5 C2 2 23 R4 C3 3 22 R3 3 20 R3 C4 4 21 R2 C4 4 19 R2 C5 5 20 R1 18 R1 C6 6 17 LOCK C7 7 16 VDD VSS 8 15 MODE XT 9 14 DTMF XT 10 13 DP/C9 T/P MUTE 11 12 HKS W91590L 28 R5 C2 2 27 R4 C3 3 26 R3 C4 4 25 R2 C5 5 24 R1 C6 6 23 HPM MUTE C7 7 22 NC C8 8 21 DRS KT 9 20 VDD VSS 10 19 MODE XT 11 18 DTMF XT 12 17 DP/C9 13 16 HKS 14 15 HFO T/P MUTE HFI W91590B/C C3 5 1 W91590A R5 C5 C1 C6 6 19 LOCK C7 7 18 VDD VSS 8 17 MODE XT XT T/P MUTE HFI 9 16 DTMF C1 1 28 R5 C2 2 27 R4 C3 3 26 R3 C4 4 25 R2 C5 5 24 R1 C6 6 23 HPM MUTE C7 7 22 LOCK C8 8 21 DRS KT 9 20 VDD VSS 10 19 MODE XT 11 18 DTMF XT 12 17 DP/C9 10 15 DP/C9 11 14 HKS T/P MUTE 13 16 HKS 12 13 HFO HFI 14 15 HFO W91590AL -2- W91590BL/CL W91590 SERIES PIN DESCRIPTION SYMBOL ColumnRow Inputs 22-PIN 1−7 & 18−22 24-PIN 1−7 & 20−24 28-PIN 1−8 & 24−28 XT, XT 9, 10 9, 10 11, 12 T/P MUTE 11 11 13 HPM MUTE - - 23 MODE 15 17 19 HKS 12 14 16 DP /C9 13 15 17 NC 17 19 22 (W91590) (W91590A) (W91590B/C) I/O FUNCTION I The keyboard input may be from either the standard 9 × 5 keyboard or an inexpensive single contact (form A) keyboard. Electronic input from a µC can also be used. A valid key entry is defined by a single row being connected to a single column. I, O A built-in inverter provides oscillation with an inexpensive 3.579545 MHz crystal or ceramic resonator. O The T/P MUTE is a conventional CMOS N-channel open drain output. The output transistor is switched on during pulse and tone mode dialing sequence and flash break. Otherwise, it is switched off. O The HPM MUTE is a conventional inverter output. During pulse dialing, flash, hold, and mercury mute functions, this pin will output an active high. It remains in a low state at all other times. I Pulling mode pin to VSS places the dialer in tone mode. Pulling mode pin to VDD places the dialer in pulse mode (M/B = 2:3). Leaving mode pin floating places the dialer in pulse mode (M/B = 1:2). I Hook switch input. HKS = 1: On-hook state. Chip in sleeping mode, no operation. HKS = 0: Off-hook state. Chip enabled for normal operation. HKS pin is pulled to VDD by internal resistor. O N-channel open drain dialing pulse output (Figure 1). Flash key causes DP to go active when in pulse mode and tone mode. - No connection. -3- Publication Release Date: July 1995 Revision A3 W91590 SERIES Pin Description, continued SYMBOL LOCK 22-PIN 24-PIN 28-PIN I/O FUNCTION 17 19 22 I The function of this pin is as follows: (For (For (For FUNCTION LOCK PIN W91590L) W91590AL) W91590BL/CL) "0","9" dialing inhibited Normal dialing "0" dialing inhibited VDD Floating VSS DTMF 14 16 18 O In pulse mode, remains in low state at all times. In tone mode, outputs a dual or single tone. Detailed timing diagram for tone mode is shown in Figure 2. OUTPUT FREQUENCY Specified VDD, VSS HFI, HFO 16, 8 - 18, 8 12, 13 20, 10 14, 15 Actual 697 699 +0.28 R2 770 766 -0.52 R3 852 848 -0.47 R4 941 948 +0.74 C1 1209 1216 +0.57 C2 1336 1332 -0.30 C3 1477 1472 -0.34 I Power input pins. I, O Handfree control pins. A low pulse on the HFI input pin toggles the handfree control state. Status of the handfree control state is listed in the following table: CURRENT STATE Hook SW. KT - - Error% R1 HFO NEXT STATE Input HFO Dialing Yes - Low HFI High On Hook High HFI Low No Off Hook High Low Yes On Hook - Low Yes Off Hook Low On Hook Low No Off Hook High On Hook High Yes HFI Off Hook HFI pin is pulled to VDD by internal resistor. The detailed timing is shown in Fig 3. O Key tone signal output. A key tone will be generated whenever a valid keys is pressed. Frequency is 600 Hz and duration is 35 mS. 9 -4- W91590 SERIES Pin Description, continued SYMBOL DRS 22-PIN - 24-PIN - 28-PIN 21 I/O FUNCTION I Dial rate selection. This pin is pulled to VDD by an internal resistor. MODE PIN DRS 1 DIAL RATE TONE/PULSE M/B VDD Floating Pulse Pulse 10 ppS 2:3 10 ppS 1:2 VSS Tone Pulse Pulse 10 ppS 1:2 20 ppS 1:2 VDD 2 Floating VSS Tone BLOCK DIAGRAM XT HKS LOCK MODE XT SYSTEM CLOCK GENERATOR DRS HFI KT ROW (R1 to R5) KEYBOARD READ/WRITE COUNTER INTERFACE CONTROL LOGIC PULSE CONTROL LOGIC T/P MUTE HPM MUTE HFO RAM COLUNM LOCATION LATCH (C1 to C8) DTMF DP/C9 D/A CONVERTER ROW & COLUMN PROGRAMMABLE COUNTER -5- DATA LATCH & DECODER Publication Release Date: July 1995 Revision A3 W91590 SERIES FUNCTIONAL DESCRIPTION Keyboard Operation C1 C2 C3 C4 C5 C6 C7 DP /C9 C8 1 2 3 S M00 M05 M10 M15 EM1 R1 4 5 6 MEMO M01 M06 M11 M16 EM2 R2 7 8 9 CLR M02 M07 M12 M17 EM3 R3 */T 0 # R/P M03 M08 M13 M18 H R4 F1 F2 F3 R M04 M09 M14 M19 *MER R5 MER location in W91590C/CL is SAVE memory. • S: Store function key • F1, F2, F3: Flash keys • R: One-key redial • H: Hold function key • C9 : This key is connected to pin DP /C9 via a bipolar switching transistor and a diode • M0j: Direct or indirect (MEMO + M0j = M1j) repertory memory • M1j: Direct repertory dialing • EMi: One-touch memory for emergency call • */T: * & P→T • CLR: Clear key • R/P: Redial and pause function key • MER: One-touch memory for mercury code dialing • MEMO: Indirect repertory dialing function key Note: Dn = 0 to 9, *, #, Mij = M00 to M19 (i = 0, 1; j = 0 to 9). Normal Dialing OFF HOOK (or ON HOOK & ), HFI D1 , D2 , …, 1. D1, D2, ..., Dn will be dialed out. 2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits. -6- Dn W91590 SERIES Redialing 1. OFF HOOK , D1 , , …, D2 (or ON HOOK & HFI ), or ON HOOK & HFI , , HFI Dn BUSY, Come ON HOOK , OFF HOOK R/P D1 , , …, D2 Dn , BUSY, Come HFI R/P The R/P key can execute redial function only as first key-in after off-hook. Otherwise, it will execute pause function. 2. OFF HOOK (or ON HOOK & ), HFI D1 , , …, D2 Dn , R a. The one-key redial function timing diagram is shown in Figure 4. b. If dialing D1 to Dn is completed, pressing the R key will cause the pulse output of pin to go low for 2.2 seconds. Break time and a 600 mS pause will automatically be added. c. If the pulses of the dialed number D1 to Dn have not finished, R will be ignored. Number Store 1. OFF HOOK S , Mij (or , ON HOOK EMi or & ), HFI S , D1 , D2 , …, Dn MER D1, D2, ..., Dn will be stored in memory location but will not be dialed out. R/P and */T keys can be stored as a digit in memory. In store mode, R/P is the pause function key. The store mode can be released after the store function is executed or the state of the hook switch is changed. 2. S , D1 , D2 , …, Dn , S , i , j D1, D2, ..., Dn will be stored in memory location Mij and will not be dialed out. 3. S , D1 , D2 , …, Dn , S , MEMO , M0j a. D1, D2, ..., Dn will be stored in memory location M10 to M19 and will not be dialed out. b. MEMO + M0j = M1j. -7- Publication Release Date: July 1995 Revision A3 W91590 SERIES 4. OFF HOOK (or ON HOOK & or ), HFI D1 , D2 , …, Dn , S , S , Mn Ln a. D1, D2, ..., Dn will be stored in memory location and will be dialed out. b. The 5. D1 S , key must be pressed after completion of the dialing sequence. , …, D2 Dn , S , S , i , j D1, D2, ..., Dn will be stored in memory location Mij and will be dialed out. 6. D1 , , …, D2 Dn , S , S , MEMO , M0j a. D1, D2, ..., Dn will be stored in memory location M10 to M19 and will be dialed out. b. MEMO + M0j = M1j. Repertory Dialing 1. OFF HOOK (or ON HOOK & HFI ), Mij or EMi or MER 2. OFF HOOK (or ON HOOK & HFI ), MEMO , i 3. OFF HOOK (or ON HOOK & HFI ), MEMO , M0j ), D1 D2 , , j Access Pause OFF HOOK (or ON HOOK & HFI 1. The pause function can be stored in memory. , R/P , D3 2. The pause function is executed in normal dialing, redialing, or memory dialing. 3. The pause function timing diagram is shown in Figure 5. Pulse-to-Tone (*/ T) OFF HOOK (or */T , , D1' ON HOOK D2' , …, & ), HFI D1 , D2 , …, Dn' 1. If the mode switch is set to pulse mode, then the output signal will be: D1, D2, ..., Dn, Pause (3.6s) , D1', D2', ..., Dn' (Pulse) (Tone) 2. If the mode switch is set to tone mode, then the output signal will be: D1, D2, ..., Dn, * (Tone) , D1', D2', ..., Dn' (Tone) (Tone) -8- Dn , , …, Dn W91590 SERIES 3. The dialer remains in tone mode when the digits have been dialed out and can be reset to pulse mode only by going on-hook. 4. The P→T function timing diagram is shown in Figure 6. 5. */ T key can be stored as a digit in memory Flash (F = F1, F2, F3) OFF HOOK (or ON HOOK & ), F HFI 1. Flash key cannot be stored as a digit in memory, and has first priority among keyboard functions. 2. The system will return to the initial state after the break time is finished. 3. The flash function timing diagram is shown in Figure 7. Clear key 1. CLR , R/P (or R ) Redial and one-key redial buffer will be cleared. 2. CLR , Mij Location Mij buffer content will be cleared. 3. CLR , i , j Location Mij buffer content will be cleared. 4. CLR , MEMO , M0j Location Mij buffer content will be cleared. Save 1. OFF HOOK (or ON HOOK & ), D1, D2, …, Dn HFI S , S , SAVE S , S , SAVE D1, D2, …, Dn will be stored in save memory and dialed out. 2. OFF HOOK (or ON HOOK & ), HFI SAVE D1, D2, …, Dn will be stored in save memory but will not be dialed out. 3. OFF HOOK (or ON HOOK & ), D1, D2, …, Dn HFI D1, D2, …, Dn will be stored in save memory and dialed out. -9- Publication Release Date: July 1995 Revision A3 W91590 SERIES CHAIN DIALING Relationship between the memory and the chain dialing buffer: Memory Digit Location 16 M00 16 . . . . . . . . . . . . . . M01 . . . . Chain Dialing Buffer Section 1 Section 2 M18 Section 3 M19 M20 EM1 Section 4 EM2 16 EM3 32 Normal Dialing The chain dialing buffer may be divided into four sections, allowing up to four numbers to be dialed out in sequence. For example, if the user enters M01, M03, EM1, and normal dialing (manual dialing), the content of sections 1 to 4 will be M01, M03, EM1, and normal dialing (manual dialing). When numbers are entered into the chain dialing buffer, there is no need to wait until the previous dialing sequence has been completed. Numbers may be entered directly, one after the other, even while previous numbers are being dialed out. 1. Manual Dialing + Repertory Dialing Redial buffer content = Manual dialing + Repertory dialing 2. Repertory Dialing + Manual Dialing Redial buffer content = Repertory dialing + Manual dialing 3. Repertory Dialing + Repertory Dialing Redial buffer content = Repertory dialing + Repertory dialing 4. Redialing + Manual Dialing Redial buffer content = Redialing + Manual dialing The primary redial content may not be manual dialing, or else the last redial content will be overwritten. 5. Redialing + Repertory Dialing - 10 - W91590 SERIES Redial buffer content = Redialing + Repertory dialing Redialing is valid only as the first key-in after off-hook or after the handfree dialing function is toggled on. The second sequence should not be performed until the first sequence is completely dialed out. 6. Manual Dialing + One-Key Redialing Redial buffer content = Manual dialing The One-key redial may only be used after dialing out of a manual dialing sequence is completed. 7. Repertory Dialing 1 (M1) + One Key Redialing Repertory Dialing 2 (M2) + One Key Redialing Repertory Dialing 1 (M1) + One Key Redialing Repertory Dialing 2 (M2) , + or ON HOOK , + OFF HOOK , Redialing M1 and M2 represent any of the repertory dialing memories. The first redialing will dial out M1; the second will dial out M1, M2. If dialing out of the repertory dialing memories has not been completed, the one-key redial key will be ignored. Dialing of the second repertory dialing memory (M2) should not be performed until the one-key redialing operation is completed. Notes: 1. Chain dialing (cascaded dialing) allows for memory or manual dialing while a previous dialing sequence is still being dialed out. 2. More than one sequence of manual dialing is not permitted. Entering more than one manual dialing sequence will inhibit redialing. Chain dialing of more than four sections is not permitted. Manual Dialing + M1 + Manual Dialing (two sections of manual dialing) 3. If more than four sections are entered, all sections after the fourth section will be ignored and redialing will be inhibited. Manual Dialing + M1 + M2 + M3 + M4 (over 4 sections, ignore M4 and inhibit redial) 4. There is a 2.0 sec. inter-chain dialing pause for cascaded dialing. - 11 - Publication Release Date: July 1995 Revision A3 W91590 SERIES MERCURY DIALING 1. Up to 32 digits may be stored. 2. Mercury dialing is activated only as the first key-in after off-hook or handfree dialing is activated. 3. The timing diagram for the mercury memory function is given below. KEY IN MER DP TP TIDP T/P MUTE DTMF HPM MUTE OSCILLATION OSC. Mercury Function Timing Diagram ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATING UNIT VDD−VSS -0.3 to +7.0 V VIL VSS -0.3 V VIH VDD +0.3 V VOL VSS -0.3 V VOH VDD +0.3 V PD 120 mW Operating Temperature TOPR -20 to +70 °C Storage Temprature TSTG -55 to +125 °C DC Supply Voltage Input/Output Voltage Power Dissipation Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device. - 12 - W91590 SERIES DC CHARACTERISTICS (VDD−VSS = 2.5V, FOSC. = 3.58 MHz, Ta = 25° C, all outputs unloaded) PARAMETER SYM. Operating Voltage VDD Operating Current IOP CONDITIONS MIN. TYP. MAX. UNIT 2.0 - 5.5 V Tone - 0.3 0.5 mA Pulse - 0.15 0.3 Standby Current ISB HKS = 0, No load & No key entry - - 15 µA Memory Retention Current IMR HKS = 1, VDD = 1.0V - - 0.2 µA DTMF Output Voltage VTO Row group, RL = 5K 130 150 170 VrmS Col/Row, VDD = 2.0 to 5.5V 1 2 3 dB Pre-emphasis - DTMF Distortion THD RL = 5 KΩ, VDD = 2.0 to 5.5V - -30 -23 dB DTMF Output DC Level VTDC RL = 5 KΩ, VDD = 2.0 to 5.5V 1.0 - 3.0 V DTMF Output Sink Current ITL VTO = 0.5V 0.2 - - mA DP Output Sink Current IPL VPO = 0.5V 0.5 - - mA T/P MUTE Output Sink Current IML VMO = 0.5V 0.5 - - mA HPM MUTE Output Sink Current IHPML VTO = 0.5V 0.5 - - mA HPM MUTE Output drive Current IHPMH VTH = 2.0V 0.5 - - mA - 300 500 KΩ mA HKS I/P Pull High Resistor RKH Key Tone Output Current IKTH VKTH = 2.0V 0.5 - - IKTL VKTH = 0.5V 0.5 - - IHFH VHFH = 2.0V 0.5 - - IHFL VHFL = 0.5V 0.5 - - Keypad Input Drive Current IKD VI = 0V 30 - - µA Keypad Input Sink Current IKS VI = 2.5V 200 400 - µA - - 5.0 KΩ HFO Drive/Sink Current Keypad Resistance - 13 - mA Publication Release Date: July 1995 Revision A3 W91590 SERIES AC CHARACTERISTICS PARAMETER SYM. CONDITIONS MIN. TYP. MAX. UNIT Keypad Active in Debounce TKID - - 20 - mS Key Release Debounce TKRD - - 20 - mS Pre-digit Pause1 TPDP1 MODE Pin = 1 - 40 - mS 10 ppS MODE Pin = Floating - 33.3 - TPDP2 MODE Pin = 1 - 20 - 20 ppS MODE Pin = Floating - 16.7 - 10 ppS - 800 - 20 ppS - 500 - MODE Pin = 1 - 40:60 - MODE Pin = Floating - 33:67 - Pre-digit Pause2 Interdigit Pause (Auto dialing) Make/Break Ratio TIDP M/B mS mS % Tone Output Duration TTD Auto Dialing - 93 - mS Intertone Pause TITP Auto Dialing - 93 - mS Flash Break Time TFB - 98 - mS - 305 - - 600 - - Pause Time TP - - 3.6 - S Key Tone Frequency FKT - - 600 - Hz Key Tone Duration TKTD - - 35 - mS One-key Redialing Pause Time TPR - - 600 - mS One-key Redialing Break Time TRB - - 2.2 - S First Key-in Pause Time TFKP - - 600 - mS Notes: 1. Crystal parameters suggested for proper operation are Rs < 100 Ω, Lm = 96 mH, Cm = 0.02 pF, Cn = 5 pF, Cl = 18 pF, FOSC. = 3.579545 MHz ±0.02%. 2. Crystal oscillator accuracy directly affects these times. - 14 - W91590 SERIES TIMING WAVEFORMS HKS H 4 KEY IN 2 2 TKID M B TKID DP TPDP TIDP TIDP TIDP TPDP T/P MUTE HPM MUTE KT LOW DTMF TFKP OSC. OSCILLATION OSCILLATION Figure 1. Pulse Mode Diagram (Normal Dialing) HKS KEY IN TKRD TKID TKID TKRD TITP DTMF TTD TITP TITP T/P MUTE LOW HPM MUTE LOW KT HIGH DP OSC. TFKP OSCILLATION OSCILLATION Figure 2. Tone Mode Diagram (Normal Dialing) - 15 - Publication Release Date: July 1995 Revision A3 W91590 SERIES Timing Waveforms, continued ON HOOK HKS OFF HOOK HFI H KEY HFO T/P MUTE HIGH HPM MUTE LOW CHIP ENBLE Figure 3(a). Note: The H KEY cannot be enabled when chip is disabled. HKS OFF HOOK HFI H KEY HFO T/P MUTE HIGH HPM MUTE CHIP ENBLE Figure 3(b). Note: The HFI and HFI inputs will toggle the HFO signal; as soon as either HFI or H KEY is activated the HFO signal will go high and previous inputs will be ignored. - 16 - W91590 SERIES Timing Waveforms, continued HKS ON HOOK HFI H KEY HFO T/P MUTE HIGH HPM MUTE CHIP ENBLE Figure 3(c). Note: Changing the state of the HKS signal from high to low will initialize the HFO and HPM MUTE signals. LOW HKS R KEY IN TKID TRB DP TIDP TIDP TPDP T/P MUTE HPM MUTE KT LOW DTMF TFKP OSC. OSCILLATION Figure 4. Pulse Mode One-key Redialing Timing Diagram (when not first key) - 17 - Publication Release Date: July 1995 Revision A3 W91590 SERIES Timing Waveforms, continued HKS 4 KEY IN 2 TKID B M R/P 2 M B DP TPDP TIDP TPDP TIDP TIDP T/P MUTE TP HPM MUTE KT LOW DTMF TFKP OSCILLATION OSC. Figure 5. Pause Function Timing Diagram HKS 2 4 KEY IN TKID B M DP TPDP */T 8 M B TIDP TIDP T/P MUTE TP HPM MUTE KT TIDP DTMF TFKP OSC. OSCILLATION Figure 6. Pulse-to-Tone Function Timing Diagram - 18 - W91590 SERIES Timing Waveforms, continued LOW HKS KEY IN F DP T/P MUTE TFB HPM MUTE KT DTMF LOW TFKP OSC. OSCILLATION Figure 7. Flash Operation Timing Diagram - 19 - Publication Release Date: July 1995 Revision A3 W91590 SERIES Headquarters Winbond Electronics (H.K.) Ltd. No. 4, Creation Rd. III, Science-Based Industrial Park, Hsinchu, Taiwan TEL: 886-3-5770066 FAX: 886-3-5792697 http://www.winbond.com.tw/ Voice & Fax-on-demand: 886-2-7197006 Rm. 803, World Trade Square, Tower II, 123 Hoi Bun Rd., Kwun Tong, Kowloon, Hong Kong TEL: 852-27516023 FAX: 852-27552064 Taipei Office 11F, No. 115, Sec. 3, Min-Sheng East Rd., Taipei, Taiwan TEL: 886-2-7190505 FAX: 886-2-7197502 Note: All data and specifications are subject to change without notice. - 20 - Winbond Electronics North America Corp. Winbond Memory Lab. Winbond Microelectronics Corp. Winbond Systems Lab. 2730 Orchard Parkway, San Jose, CA 95134, U.S.A. TEL: 1-408-9436666 FAX: 1-408-9436668