W91621

W91620 SERIES 10-MEMORY TONE/PULSE DIALER WITH TWO-STAGE REDIAL FUNCTION GENERAL DESCRIPTION The W91620 series are Si-gate CMOS ICs that provide the signals needed for either pulse or tone dialing. The W91620 series features a ten-channel, 32-digit automatic dialing memory. FEATURES • • • • • • • • • • • • • • • • DTMF/Pulse switchable dialer 32-digit redial memory Two-stage redial function Ten by 32 digit two-touch indirect repertory memory Mixed dialing, cascade dialing allowed Pulse-to-tone (P→T) keypad for long distance call operation Easy operation with redial, flash, pause and P→T keypads Pause, pulse-to-tone (P→T) can be stored as a digit in memory Tone output duration: as long as key is depressed or 90 mS minimum Minimum intertone pause: 90 mS Flash time: 100 mS Uses 4 × 5 keyboard On-chip power-on reset Uses 3.579545 MHz crystal or ceramic resonator Packaged in 18-pin DIP The different dialers in the W91620 series are shown in the following table TYPE NO. W91620 W91621 DIALING RATE 10 ppS PAUSE 4 sec B:M 2:1 3:2 FLASH 100 mS -1- Publication Release Date: December 1994 Revision A3 W91620 SERIES PIN CONFIGURATION C1 C2 C3 C4 P MUTE VSS XT XT T/P MUTE 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 R4 R3 R2 R1 V DD MODE DTMF DP/C5 HKS PIN DESCRIPTION SYMBOL ColumnRow Inputs PIN NO. 1−4 & 15−18 I/O I FUNCTION Keyboard inputs are designed for use with either a standard 4 × 5 keyboard or an inexpensive single contact (Form A) keyboard. Electronic input from a µC can also be used. Valid key entry is defined by a connection between a single row and a single column. XT, XT T/P MUTE 7, 8 9 I, O O A built-in inverter provides oscillation with an inexpensive 3.579545 MHz crystal or ceramic resonator. The T/P MUTE is a conventional CMOS inverter output. It is low during pulse and tone mode dialing sequence and flash break; otherwise, it remains high. Mode pin. Pull to VSS: Tone mode Pull to VDD or leave floating: Pulse mode (10 ppS, M/B = 2:3 or 1:2) MODE 13 I -2- W91620 SERIES Pin Description, Continued SYMBOL HKS PIN NO. 10 I/O I FUNCTION Hook switch input. Conventional CMOS input with an internal protection diode and a pull-high resistor to VDD. HKS = 1: On-hook state. Chip in sleep mode, no operation. HKS = 0: Off-hook state. Chip enabled for normal operation. During dialing, this input ignores HKS = 1 for durations of less than 150 mS (i.e., dialing is not terminated). DP / C5 11 O Open drain dialing pulse output (Figure 1). Flash key causes DP / C5 to be active in both tone mode and pulse mode. DTMF 12 O During pulse dialing, maintains 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(a, b). OUTPUT FREQUENCY Specified R1 R2 R3 R4 C1 C2 C3 697 770 852 941 1209 1336 1477 Actual 699 766 848 948 1216 1332 1472 Error % +0.28 -0.52 -0.47 +0.74 +0.57 -0.30 -0.34 VDD, VSS P MUTE 14, 6 5 I O Power input pins. The P MUTE is a conventional CMOS inverter output. It is high during pulse dialing sequence and flash break. Otherwise, it remains low. -3- Publication Release Date: December 1994 Revision A3 W91620 SERIES BLOCK DIAGRAM XT XT HKS MODE SYSTEM CLOCK GENERATION READ/WRITE COUNTER ROW (R1 to R4) KEYBOARD INTERFACE RAM CONTROL LOGIC PULSE CONTROL LOGIC T/P MUTE P MUTE DP/C5 COLUMN (C1 to C4) LOCATION LATCH DTMF D/A CONVERTER ROW & COLUMN PROGRAMMABLE COUNTER DATA LATCH & DECODER FUNCTIONAL DESCRIPTION Keyboard Operation C1 1 4 7 * • • • • • • C2 2 5 8 0 C3 3 6 9 # C4 S F A R DP / C5 P→T P R1 R2 R3 R4 S: Store function key F: Flash key P→T: In pulse mode, this key works as Pulse→Tone key R: Redial function key A: Indirect repertory dialing key P: Pause key -4- W91620 SERIES Normal Dialing OFF HOOK , D1 , D2 , ..., Dn 1. D1, D2, ..., Dn will be dialed out. 2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits in normal dialing. 3. Dialing mode is determined at the on/off hook transition. Redialing 1. OFF HOOK , D1 , D2 , ..., Dn , Busy, Come ON HOOK , OFF HOOK , R R key executes function. the redialing The 2. Redial content = D1, D2, ..., Dn OFF HOOK , R, D1' , D2' , P→T , D3' , D4' a. D1, D2, ..., Dn, D1', D2', P→T, D3', D4' will be dialed out. b. Redial register is changed to D1, D2, ..., Dn, D1', D2', P→T, D3', D4'. c. OFF HOOK , R (1st) R (2 nd) D1, D2, ..., Dn, D1', D2', will be dialed out, P→T, D3', D4' will be dialed out. 3. Ln content = D1, D2, P→T, D3, D4 OFF HOOK , A , Ln , will dial out D1, D2, P→T, D3, D4 , R will dial out D1, D2. , Ln , , R R key is pressed. A , Lp then ON HOOK , OFF HOOK 4. OFF HOOK Busy, then , A , Lm , , A ON HOOK OFF HOOK a. The digits stored in Lm, Ln, and Lp will be dialed out after the b. If length oversteps 32 digits, redial is inhibited. c. Redial register stores not only normal dialing digits but also repertory or mixed dialed numbers. -5- Publication Release Date: December 1994 Revision A3 W91620 SERIES Number Store 1. OFF HOOK , S, D1 , D2 , ..., Dn , A , Ln , ON HOOK a. D1, D2, ..., Dn will be stored in memory location Ln but will not be dialed out. b. Ln = 0 to 9; Dn = 0 to 9, * , # , Pause, P→T. c. The store mode is released to the initial state only when all store operations are finished. There is no need to perform For example then then S S , S , ON HOOK , OFF HOOK to begin a second store operation. , A , Ln , D1 , D2 , D3 , D4 D1' , D2' , still D3' , D4' , A , Lp , , ..., is available. But the following sequence is not valid: S then 2. , D1 S , , , D2 A , , R, D3 Ln A, Ln , ON HOOK , D4 , A , Ln , R, S, OFF HOOK a. Redial content is transferred to memory Ln. b. When the last number was dialed from redial memory, the content of the redial memory cannot be transferred to a memory location. For example, if the redial content is 1 2 3 4 5 + A 3, it cannot be transferred to a memory location, and the content of Ln will not be modified. Memory Clear OFF HOOK , S , A , Ln , S , A , Lp , ... The Ln, Lp, etc., memories will be cleared. Repertory Dialing OFF HOOK , A , Ln 1. The digits stored in Ln will be dialed out. 2. The type of output signal is determined by the mode switch. 3. The redial register content is the content of location number Ln. 4. If the content of Ln is 1, 2, 3, P→T, 4, 5, 6, the redial function will execute the P¡÷T function and the system will change to tone mode. Access Pause OFF HOOK , D1 , D2 , P , D3 , ..., -6Dn W91620 SERIES 1. The pause function can be stored in memory. 2. The pause function may be executed in normal dialing, redialing, or memory dialing (4.0 sec/pause). 3. The pause function can be stored as the first digit in memory. 4. The pause time depends on the number of times the P key is depressed. For example, if the sequence 1, 2, P, P, 4, 5, 6 is keyed in, then the pause time is 8 seconds. 5. The pause function timing diagram is shown in Figure 3. -7- Publication Release Date: December 1994 Revision A3 W91620 SERIES Pulse-to-tone (P→T) 1. OFF HOOK , D1 , D2 , ..., Dn , P→T , D1' , D2' , ..., Dn' a. If the mode switch is set to pulse mode, then the output signal will be as follows: D1, D2, ..., Dn, no pause, D1', D2', ..., Dn' (Pulse) (Tone) In this case, the device can be reset to pulse mode only by going on-hook, because tone mode remains enabled after the digits have been dialed out. b. If the mode switch is set to tone mode, then the output signal will be as follows: D1, D2, ..., Dn, no pause, D1', D2', ..., Dn' (Tone) (Tone) c. The P→T key may be pressed before the first sequence is dialed out completely. 2. OFF HOOK , R a. If the mode switch is set to pulse mode, then the output signal will be as follows: D1, D2, ..., Dn (Pulse) b. In the first redial operation, only the digits before the tone key are dialed out. R (2nd) D1', D2', ..., Dn' are dialed out. (Tone) c. In the second redial operation, the digits after the tone key are dialed out. 3. OFF HOOK , A, Ln a. The P→T key can be stored in memory as a digit. The digits after the P→T key are also sent in repertory dialing. b. The P→T key does not stop dialing (no pause). c. The number stored in memory location Ln will be transferred to the redial register, but the P→T function will not be executed during redialing if the P→T key has been stored in location Ln. d. The P→T function timing diagram is shown in Figure 4. -8- W91620 SERIES Flash OFF HOOK 1. The F , D1 , D2 , D3 , F , D4 , D5 , D6 key may be pressed before digits D1, D2, D3 are sent completely. Digits D4, D5, D6 may be pressed during the 100 mS. flash period. 2. The flash key cannot be stored as a digit in memory or in the redial register. 3. The content of the redial register is D1, D2, D3, D4, D5, D6. The redial register. 4. OFF HOOK Ln then , S, D1 , , D2 , D3 , , A, F Ln , D4 , D5 , D6 , A , F key is not stored in the ON HOOK OFF HOOK D1, D2, D3, D4, D5, D6 will be dialed out. 5. The flash does not have first priority among the keyboard functions. 6. The flash pause time is 800 mS, so there is a pause of 800 mS between the flash and the next digit dialed (see Figure 5). 7. The dialer will not return to the initial state after the flash break time has elapsed. 8. The flash function timing diagram is shown in Figure 5. Cascaded & Mixed Dialing Cascaded Dialing 1. Definition of cascaded dialing: The next sequence may be pressed before the previous sequence is sent out completely. Examples of cascaded dialing. Example 1: Example 2: Example 3: Normal dialing ¡Ï Repertory dialing 1 ¡Ï ¡Ï Repertory dialing 2 ¡Ï... ¡Ï... Repertory dialing ¡Ï Normal dialing ¡Ï ¡Ï Repertory dialing 2 ¡Ï... Redialing Normal dialing Repertory dialing 1 2. The rectangles above represent one sequence of normal dialing, redialing, or repertory dialing. 3. At most 64 digits are allowed in cascaded dialing. There is no limitation on the number of sequences. 4. The content of cascaded dialing may include a combination of normal dialing, redialing, and repertory dialing. Redialing is valid only as the first key-in, however. 5. ON HOOK , OFF HOOK , R : The cascaded dialing sequences described in the above Publication Release Date: December 1994 Revision A3 -9- W91620 SERIES above examples will be dialed out only if they do not exceed a total of 32 digits. If the length of the combined sequences oversteps 32 digits then redialing is inhibited. Mixed Dialing 1. Definition of mixed dialing: Mixed dialing is a combination of sequences of normal dialing, repertory dialing, and redialing. The three examples given for cascaded dialing are also examples of mixed dialing, provided each sequence is dialed out completely before the next sequence is entered. 2. There is no limitation on the number of digits and sequences in mixed dialing. 3. If a mixed dialing sequence includes redialing, the redialing is valid only as the first key-in. 4. ON HOOK , OFF HOOK , R : The mixed dialing sequences described in the above examples will be dialed out only if the total number of digits does not exceed 32. If the total oversteps 32 digits, then redialing is inhibited. Combination of Cascaded and Mixed Dialing 1. Cascaded dialing and mixed dialing can be combined; each follows the rules described above. 2. To apply redialing to combinations of cascaded and mixed dialing: ON HOOK , OFF HOOK , R : Redialing will be executed only if the total number of digits does not exceed 32. If the total oversteps 32 digits, then redialing is inhibited. 3. If n cascaded sequences with a total of 60 digits have been dialed, then for the (n+1)th cascaded sequence, either one 4-digit normal dialing sequence or one complete repertory dialing sequence (length up to 30 digits) may be dialed. The (n+2)th sequence is not accepted for cascaded dialing. 4. After a total of 64 digits of cascaded dialing, mixed dialing can be added. ABSOLUTE MAXIMUM RATINGS PARAMETER DC Supply Voltage Input/Output Voltage SYMBOL VDD−VSS VIL VIH VOL VOH Power Dissipation Operating Temperature Storage Temperature PD TOPR TSTG RATING -0.3 to +7.0 VSS -0.3 VDD +0.3 VSS -0.3 VDD +0.3 120 -20 to +70 -55 to +150 UNIT V V V V V mW °C °C Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device. - 10 - W91620 SERIES DC CHARACTERISTICS (FOSC. = 3.58 MHz, TA = 25° C, all outputs unloaded) PARAMETER Operating Voltage Operating Current Standby Current Memory Retention Current DTMF Output Voltage Pre-emphasis DTMF Distortion DTMF Output DC Level DTMF Output Sink Current DP / C5 Output Sink Current P MUTE & T/P MUTE Output Drive Current P MUTE & T/P MUTE Output Sink Current Keypad Input Drive Current Keypad Input Sink Current Keypad Resistance HKS I/P Pull High Resistance Input Voltage Low Level Input Voltage High Level SYM. VDD IOP ISB IMR VTO CONDITIONS Tone, VDD = 2.5V Pulse, VDD = 2.5V HKS = 0, No load & No key entry HKS = 1, VDD = 1.0V Row group, RL = 5 KΩ Col/Row, VDD = 2.0 to 5.5V MIN. 2.0 130 1 1.0 0.2 0.5 0.2 0.5 4 200 0 0.8 VDD TYP. 0.30 0.15 150 2 -30 400 300 - MAX. 5.5 0.50 0.30 15 0.2 170 3 -23 3.0 5.0 0.2 VDD VDD UNIT V mA µA µA mVrms dB dB V mA mA mA mA µA µA KΩ KΩ V V THD VTDC ITL IPL IMH IML IKD IKS RL = 5 KΩ VDD = 2.0 to 5.5V RL = 5 KΩ VDD = 2.0 to 5.5V VTO = 0.5V VDD = 2.5V VPO = 0.5V VDD = 2.5V VMO = 2.0V VDD = 2.5V VMO = 0.5V, VDD = 2.5V VI = 0V, VDD = 2.5V VI = 2.5V, VDD = 2.5V - VIL VIH Pins 1, 2, 3, 4, 10, 13, 15, 16, 17, 18 - 11 - Publication Release Date: December 1994 Revision A3 W91620 SERIES AC CHARACTERISTICS PARAMETER Keypad Active in Debounce Key Release Debounce Pre-digit Pause SYMBOL TKID TKRD TPDP1 10 ppS Interdigit Pause (Auto Dialing) Make/Break Ratio DTMF Output Duration Intertone Pause Flash Break Time Flash Pause Pause Time Pre-tone Mute 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. CONDITIONS Mode Pin = Floating Mode Pin = 1 10 ppS M/B = 1:2 M/B = 2:3 Auto Dialing - MIN. - TYP. 20 20 33.3 40 800 33:67 40:60 90 90 100 800 4.0 70 MAX. - UNIT mS mS mS TIDP M/B TTD TITP TFB TFP TP TPTM mS % mS mS mS mS S mS - 12 - Publication Release Date: December 1994 Revision A3 W91620 SERIES TIMING WAVEFORMS HKS KEY IN 3 2 R TPDP TIDP TPDP TIDP TB TM T/P MUTE TPDP TKID TIDP TPDP TIDP TKID DP/C5 P MUTE DTMF OSC. OSCILLATION NORMAL DIALING LOW OSCILLATION AUTO DIALING Figure 1. Pulse Mode Timing Diagram HKS KEY IN TKID TPTM TITP TKRD TKRD TKID TPTM TKRD DTMF TTD TITP TITP T/P MUTE HIGH LOW DP/C5 P MUTE OSC. OSCILLATION OSCILLATION Figure 2(a). Tone Mode Normal Dialing Timing Diagram - 13 - W91620 SERIES Timing Waveforms, continued HKS KEY IN R TKID TPTM DTMF TTD T/P MUTE DP/C5 P MUTE LOW HIGH TITP TITP OSC. OSCILLATION Figure 2(b). Tone Mode Auto Dialing Timing Diagram HKS 4 TKID BM DP/C5 TPDP TIDP MB TIDP TP T/P MUTE DTMF LOW KEY IN 2 P 2 TPDP TIDP P MUTE OSCILLATION OSC. Figure 3. Pause Function Timing Diagram Publication Release Date: December 1994 - 14 - Revision A3 W91620 SERIES Timing Waveforms, continued HKS P KEY IN 4 TKID T 8 2 BM DP/C5 TPDP T/P MUTE TIDP MB TIDP TITP DTMF P MUTE OSC. OSCILLATION Figure 4. P→T Operation Timing Diagram in Normal Dialing HKS LOW KEY IN F TKID F 3 DP/C5 TFB TFP TFP TIDP T/P MUTE P MUTE DTMF LOW OSC. OSCILLATION Figure 5. Flash Operation Timing Diagram W91620 SERIES Headquarters 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 Winbond Electronics (H.K.) Ltd. Rm. 803, World Trade Square, Tower II, 123 Hoi Bun Rd., Kwun Tong, Kowloon, Hong Kong TEL: 852-27516023 FAX: 852-27552064 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 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. - 16 -