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SC91214/91215 SERIES
T/P SWITCHABLE DIALER WITH REDIAL HANDFREE FUNCTION
DESCRIPTION
The SC91214/15 Series is a single-chip, silicon gate, CMOS integrated circuit with an on-chip oscillator for a 3.58MHZ crystal or ceramic resonator. It provides a dialing pulse (DP) or dual tone multifrequency (DTMF) dialing. A standard 4 X4 matrix keyboard can be used to support either DP or DTMF modes.
FEATURES
* One touch redial operation * Tone/Pulse switchable * 32 digit capacity for redialing * Automatic mixed redialing (last number redial) of pulse to DTMF with multiple automatic access pauses * PABX auto-pause is 2.2 seconds * DTMF Timing: Manual dialing: minimum duration for bursts and pauses Redialing: calibrated timing * Hands-Free control function * Wide operating voltage range: 2V to 5.5V * Key-in beep tone output * Digits dialed manually after redialing are cascadable and stored as additional digits for the next redialing * Uses inexpensive ceramic resonator (3.58 MHZ) * Two versions for different telephone systems * Built-in power up reset circuit * Four extra function keys: flash, pause, redial and DP or DTMF mixed dialing * 4 X 4 (or 2 X 8) keyboard can be used * Low standby current
ORDERING INFORMATION
Part SC91214/15A SC91214/15B SC91214/15C SC91214/15D Package DIP-16 Package DIP-18 Package DIP-18 Package DIP-20 Package
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SC91214/91215 SERIES
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING (Tamb=25C, All voltage referenced to VSS, unless otherwise specified)
Characteristics Power Supply Voltage Input Voltage Output Voltage Output Voltage (DP, XMIT MUTE) Tone Output Current Power Dissipation Operating Temperature Storage Temperature Symbol VDD VIN VOUT VOUT ITONE PD Topr Tstg Value 6.0 -0.3~VDD+0.3 -0.3~VDD+0.3 1.2 50 500 -25~+70 -55~+150 Unit V V V V mA mW C C
Note: Stresses above those listed under " Absolute Maximum Ratings"may cause permanent damage to this device. These are stress ratings only. Functional operation of this device at these or any other conditions above those indicated in the operational sections of this specification is not implied or intended. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
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SC91214/91215 SERIES
AC ELECTRICAL CHARACTERISTICS (Top=25C, VDD=3.5V, VSS=0V, fosc=3.579545MHz, All voltage
referenced to VSS, unless otherwise specified) Characteristics Operating Voltage Memory Retention Voltage Memory Retention Current Operating Current Symbol VDD VMR IMR IDDP IDDT ISO VIH VIL IR VOC VOR | IHFI | | IOH1 | Column Row VDD=3.5V, RL=5K 584 456 VDD=1.0V, HK =VDD All outputs unloaded Pulse mode Tone mode
HK =VSS
Conditions Tone mode Pulse mode
Min. 2.0 2.0 1
Typ. ---
Max. 5.5 5.5
Unit V V
Test KT. A --A
0.05 0.32 0.6 0.03 0.5 0.8 0 115 730 570 5 0.4 2
0.4 1.0 2.0 0.05 10 1 0.2
A mA A VDD A
All outputs unloaded
Standby Current
HK =VDD=1.5V All outputs unloaded,
no key selected
A
Input Voltage
R1 - R4 Input Current
C D
Tone out Voltage
HFI Pull Low Current
876 684
mVp-p A mA
VDD=3.5V (Note 1)
HFI pin connected to 0V
B B
HFO Drive Current HFO, KT , MODEOUT
XMITMUTE Sink Current
VDD=3.5V VOH=VDD-0.4V VDD=3.5V VOL=0.4V VDD=3.5V, VOL=0.4V * see note below
+ Vn )
2 1/2
IOL1 IOL2 DIS%
0.9 1.1
5.3 5.3 1 5
mA mA %
B B
DP Sink Current
Distortion
2
* Note: DIS% =
100 X ( V1 + V 2 + ( VIL + VIH )
2
2
2 1/2
1. V1 ... Vn are the intermediation or the harmonic frequencies in the 500Hz to 3400Hz band. 2. VIL and VIH are the individual frequency components of the DTMF signal.
AC CHARACTERISTICS (Top=25C, VDD=3.5V, VSS=0V, fosc=3.579545MHz, All voltage referenced to VSS,
unless otherwise specified) Characteristics Symbol Conditions 10pps Make Time TM 20pps M/B=1/2 M/B=2/3 M/B=1/2 M/B=2/3 Min. Typ. 33.3 40.0 16.7 20.0
(To be continued)
Max.
Unit
ms
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SC91214/91215 SERIES
(Continued)
Characteristics
Symbol
Conditions 10pps M/B=1/2 M/B=2/3 M/B=1/2 M/B=2/3 10pps 20pps
Min.
Typ. 66.6 60.0 33.3 30.0 824 458 2.2 2.2 0 21 5.2 23 437 90 100 90 100
Max.
Unit
Break Time
TB 20pps
ms
Inter-digit Pause Time Pause Time Auto-redial Break Time Delay Time Key Valid to Signal Out Key-in Debounce Key Release Debounce Time Key-in Tone Duration Key-in Tone Frequency Minimum Tone Duration Time Min. Tone Inter-digit Pause Redial Tone Duration Redial Tone Inter-digit Duration
TIDP TPAU TAOBK TD TKD TKLD TKTD FKT TMFD TTIDP TMFDR TTIDPR
ms sec sec ms ms ms ms Hz ms ms ms ms
COMPARISONS OF SPECIFIED VS ACTUAL TONE FREQUENCIES (fosc=3.579MHz)
R/C
R1 R2
R3
Spec. 697 770 852 941 1,29 1,336 1,477
Actual 699.1 771.5 852.3 942.0 1,215.7 1,331.7 1,471.9
Error (%) +0.31 +0.19 +0.03 +0.10 +0.57 -0.32 -0.35
Unit Hz Hz Hz Hz Hz Hz Hz
R4
C1 C2 C3
KEYBOARD ASSIGNMENT
1) */T: In PULSE mode this key works as PulseDTMF key (T key). In DTMF mode the key works as * key. */T key will occupy one memory digit in either use.
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SC91214/91215 SERIES
2) F1: Flash key. The break time is 297 ms or 96 ms (SC91214/15 respectively) 3) F2: Flash key for break time 640 ms 4) P: Pause key (2.2 seconds) 5) RD: One key redial key 6) EMn: One touch memory key 7) #: In PULSE mode this key input is neglected. In DTMF mode this key works as # key.
PIN CONFIGURATION
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PIN DESCRIPTION
Pin No. SC9121 4A 3 4 SC9121 4B 3 4 SC9121 4C 4 5 SC9121 4D 4 5 Pin Name OSCI OSCO
Description Oscillator Input and Output pins. The time base for the SC91214/15 is a crystal controlled on-chip oscillator, which is completed by connecting a 3.58MHz crystal or ceramic resonator between the OSCI and OSCO pins.
2
2
3
3
MODE IN
TRI-STATE mode select pin. There ate two versions of the SC91214/15 as follows: a. SC91215 Series is for European and American systems. MODE IN VDD VSS Floating system. MODE IN VDD VSS Floating Tone/ Pulse Pulse Tone Pulse Dial Rate 10pps -20pps M/B Ratio 1/2 -1/2 Tone/ Pulse Pulse Tone Pulse Dial Rate 10pps -10pps M/B Ratio 2/3 -1/2
b. The SC91214 Series is for the Japanese
The mode selection pin is checked for tone/pulse dialing as each digit key entery. In the PULSE mode, the dialing rate is checked, along with the make/break ratio, at first key entry. 1 1 2 2
HK
Hook switch input This inverter input pin detects the state of the hook switch contact. " Hook"is represented by a VDD Off condition.
(N.A.)
10
(N.A.)
11
KT
Key-in tone output This N-channel open drain pin sends out a " beep" tone for each PULSE mode key entry, along with entries of accepted function keys (RD, T, F1 F2, an P keys). The tone output frequency is 437Hz and tone duration is 23 ms.
(To be continued)
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SC91214/91215 SERIES
(Continued)
Pin No. SC9121 4A 9 SC9121 4B 11 SC9121 4C 10 SC9121 4D 12
Pin Name
DP
Description Dialing pulse output This is an N-channel open drain output. The normal output will be " ON"during break an " OFF" during make in the PULSE DIALING mode.
(N.A.)
(N.A.)
1
1
HFO
Hands-Free Control I/O pins These pins enable and disable the Hands-Free control function. When input pin
HFI
goes low, the
Hands-Free Control state is toggled on. The status of the Hands-Free control state is listed in the following table:
18
20
HFI
7
7
8
8
TONE
Tone dialing output When a valid key-press is detected in the DTMF mode, appropriate low group and high group, frequencies the dual tone output. TONE output is in the " OFF"state in PULSE mode.
8
8
9
9
XMITMUTE
Dialing transmission mute output This is an N-channel open drain output. The
XMITMUTE
is normally " OFF" During pulse or DTMF .
dialing this output is " . ON" (N.A.) 9 (N.A.) 10 MODE OUT 13 14 15 16 10 11 12 6 5 15 16 17 18 12 13 14 6 5 14 15 16 17 11 12 13 7 6 16 17 18 19 13 14 15 7 6 Mode output pin This is an N-channel, open drain output. It is " ON" during tone output and " OFF"during pulse output.
R1 R2
R3
Keyboard pins This input serves as the interface to an XY matrix keyboard. On a 4 X 4 matrix keyboard, the input from the fourth column,
C4 ,
should be connected
R4
C1 C2 C3
to VSS.
VDD VSS
Power supply pins These devices are designed to operate from 2.0V to 5.5V.
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SC91214/91215 SERIES
KEYBOARD OPERATION
* Symbol definitions: In the description below, signals are defined in terms of the key or switch, which is activated. OFF Hook ON Hook D1 Dn (Dk) Dn+1 Dn+m
HFI
means the phone is off the hook. means the phone is on the hook. represents for the first digit dialed in a string of digits. represents for the last digit dialed in a string of digits. represent for the beginning of a new string of digits. represents for the last digit in a new string of digits. represents for the switch that activates the HANDS-FREE DIALING mode going low. is the Pulse-to-DTMF key. is the Redial key. is the Zero key. is the Pause key. is the Flash key.
*/T RD 0 P F
* Recommended Operation 1. PULSE mode operation a. Off Hook D1 ... Dn
PULSE mode is defined as the INTIAL mode, provided the first keyboard input is not the */T key following the Off Hook condition and the mode selection pin is floating (MODE IN = VDD or floating). b. On Hook
HFI
D1 ... Dn D1 is not */T while the mode selection
Pulse mode is defined as the INITIAL mode, provided the key input
pin is VDD or floating. The chip will pause for 824 ms automatically after it detects an Off-Hook condition or if the
HFI key is depressed. It then proceeds with pulse or DTMF dialing if any keys have been depressed.
The dialing rate or make/break ratio is decided at the first key entry by checking the MODE IN status and will not be altered. The MODE IN status can only switch the DIALING mode from PULSE to DTMF after the first key ectry. 2. DTMF mode operation a. Off Hook D1 ... Dn or On Hook
HFI
D1 ... Dn
DTMF mode is defined as the INTIAL mode if the mode selection pin MOD IN is VSS. b. Off Hook D1 ... Dn or On Hook
HFI
*/T D1 ... Dn
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SC91214/91215 SERIES
The INITIAL mode is PULSE mode if the mode selection pin, MODE IN, is VDD or floating. The switch the DIALING mode to TONE mode. Unlike NORMAL mode switching, the */T key can
*/T key entry, as the first key
pressed, will not produce any pause time, there are only 31 digits of redial memory available in the buffer to be used for operation a and b, since the mode switching key, */T, will occupy one digit of space. 3. Manual dialing with automatic access pause a. Off Hook O P D1 ... Dn Pause key entries can be accepted and stored and stored in the redial memory. Each is stored as a digit. Each key-in will provide a pause of 3.57 seconds, depending on which model is being used. 4. Redial a. Off Hook RD or On Hook HFI RD Up to 32 digits (in PULSE mode) or 31 digits (in TONE mode) can be dialed using the RD key. The RD key is disabled while PULSE or TONE signals are being transmitted. Redial will also be inhibited if the last number dialed exceeds 32 digits because the redial memory can only hold 32 digits. b. Off Hook RD D1 ... Dn or On Hook
HFI
RD D1 ... Dn
After pressing the RD key, digits may be added to the number in redial memory. When finished dialing, the redial memory will contain the original digits, plus the digits dialed after pressing RD . each time the redial key is pressed, the stored number will be dialed exactly the same as it was previously, regardless of the status of the MODE IN pin. 5. TONE/PULSE switch operation a. Off Hook D1 ... Dn MODE IN pin switched to VSS Dn+1 PULSE Mode
...
Dn+m
DTMF Mode
The mode selection pin is always checked for TONE or PULSE mode key entry. Dialing can be switched from PULSE to TONE mode, but not from TONE to PULSE mode. Switching the MODE IN pin to Vss will cause the chip to store a */T digit prior to first tone digit in the redial memory and will automatically insert a 2.2 second pause before the tone digits are dialed out. After the mode has been switched, the status of the mode selection pin will no longer be checked. Therefore, it will not be possible to switch from TONE to PULSE mode. b. Off Hook D1 ... Dn */T Dn+1 ... Dn+m PULSE Mode DTMF Mode PULSE mode is initially defined with the mode selection pin, MODE IN, equal to VDD or floating. At this time, the mode can be switched to DTMF by pressing the */T key. DTMF mode will being as soon as the last pulse has been transmitted. In this mode, Dn+1 through Dn+m are sent through the TONE OUT pin as DTMF signals. If a P key entry is contained in the series of digits before or after the */T entry, or the MODE IN switch is depressed, 2.2 second pause will be added to the automatically inserted pause time, which is also 3.57 seconds. Both of the above switching modes can store as many as 31 digits in the redial memory. 6. One-key redialing Off-Hook D1 ... Dn RD or On Hook HFI D1 ... Dn RD
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SC91214/91215 SERIES
If the dialing of D1 to Dn is finished, pressing RD will cause the pulse dialing pin to go low for 67 seconds of break time and an 824 ms pause will automatically be added. If the pulses of the number dialed with D1 to Dn have not finished, the pressing of the redial key will be ignored. 7. Flash dialing Off Hook F D1 ... Dn or On Hook HFI F D1 ... Dn
The flash key emulate quick On-Off Hook operations. Pressing the flash keys, F1 or F2 , will cause a break of 96 ms or 640 ms (or, 297 ms or 640 ms, depending on the mode) on the DP output pin. Then, it pauses for 824 ms and continues dialing the digits, D1 to Dn . These digits are then stored in the redial memory. Each time the flash key is pressed, the redial memory will be cleared to store a new entry. In addition, the MODE IN status will be checked again for the setting of the TONE/PULSE DIALING mode. Similarly, to make sure that the IC is working properly, new flash key inputs will be ignored as long as the digits that were dialed have not finished.
TEST CIRCUIT
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SC91214/91215 SERIES
TIMING DIAGRAMS
1.Timing diagram in PULSE mode:
2. Timing diagram in TONE mode (i) Normal dialing
(ii) After (i), redialing
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SC91214/91215 SERIES
3. Timing diagram for SWITCHING mode operation: (i) By mode selection pin switches
(ii) By */T key entry
TPAU: Pause time (2.2 secs)
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SC91214/91215 SERIES
4. One key redial (DTMF mode used as example):
TAOBK: Break time (2.2 secs) 5. Flash dialing (DTMF mode used as example):
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SC91214/91215 SERIES
TYPACAL APPLICATION CIRCUIT
100K
100K
20P 220K A42 20P 0.47 47 1K 3.9V PULSE TONE 8050 200 100K
0.1 100
2M
LED
0.47
8050 PIEZO 100k
0.02 8050
SPE
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SC91214/91215 SERIES
PACKAGE OUTLINE
DIP-16-300-2.54 UNIT: mm
6.350.25
DIP-18-300-2.54
3.00MIN
4.36MAX
7.62
0.250.05
UNIT: mm
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SC91214/91215 SERIES
PACKAGE OUTLINE(continued)
DIP-20-300-2.54 UNIT: mm
2.54
1.27 26.40.3
15 degree
0.51MIN
0.51
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: * Persons at a work bench should be earthed via a wrist strap. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed for dispatch in antistatic/conductive containers.
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