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NT91214/15 Series
Tone/Pulse Dialer
Features
T One touch redial operation T Tone/Pulse switchable T 32 digit capacity for redialing T Automatic mixed redialing (last number redial) of pulse T PABX auto-pause is 2.2 seconds T DTMF Timing: T
to DTMF with multiple automatic access pauses Manual dialing: minimum duration for bursts and pauses Redialing: calibrated timing Hands-Free control function
T Wide operating voltage range: 2V to 5.5V T Key-in beep tone output T Digits dialed manually after redialing are T T T T
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 DTMF mixed dialing
or
T 4 x 4 (or 2 x 8) keyboard can be used T Low standby current
General Description
The NT91214/15 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 multi-frequency (DTMF) dialing. A standard 4 x 4 matrix keyboard can be used to support either DP or DTMF modes. Up to 32 digits can be saved in the on-chip RAM for redialing. In the DTMF mode, a short minimum tone duration and minimum intertone pause allows rapid dialing. Maximum tone duration depends on the key depression time during manual dialing.
Pin Configurations
a. 16-Pin Package b. 18-Pin Packages (i) Key Tone Output c. 20-Pin Package (ii) Hands-Free Control
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V1.0
NT91214/15 Series
Keyboard Assignments
1 4 7 */T 2 5 8 0 3 6 9 # F1 F2 P RD
R1 R2 R3 R4
C1
C2
C3
GND
1. */T -- In PULSE mode this key works as Pulse DTMF key (T key). In DTMF mode the key works as * key. */T key will occupy one memory digit in either use. 2. F1 -- Flash key. The break time is 297 ms or 96 ms (NT91214/15 respectively) 3. F2 -- Flash key for break time 640 ms 4. P -- Pause key (2.2 seconds) 5. RD -- One key redial key 6. # -- In PULSE mode this key input is neglected. In DTMF mode this key works as # key.
Block Diagram
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NT91214/15 Series
Absolute Maximum Ratings*
Supply Voltage (VDD). . . . . . . . . . . . . . . . . . . . 6.0V Input Voltage (VIN) . . . . . . .VSS - 0.3V to VDD + 0.3V Output Voltage (VOUT) . . . . VSS - 0.3V to VDD + 0.3V Output Voltage (VOUT)( DP , XMIT MUTE ) . . . . 1.2V Tone Output Current (ITONE) . . . . . . . . . . . . . . 50mA Power Dissipation (PD) . . . . . . . . . . . . . . . . . 500mW Operating Temperature (Top). . . . . . . -20C to +70C Storage Temperature (Tstg). . . . . . . -40C to +150C
*Comments
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.
DC Electrical Characteristics (VDD = 3.5V, VSS = 0V, Fosc = 3.579MHz, Top = 25C)
Parameter Symbol Min. 2.0 2.0 Memory Retention Voltage Memory Retention Current VMR IMR IDDP IDDT 1 0.05 0.32 0.6 0.03 0.4 1.0 2.0 0.05 A Typ. Max. 5.5 5.5 V A VDD = 1.0V, HK = VDD All outputs unloaded Pulse mode Tone mode
HK = VDD = 1.5V
Unit
Conditions PULSE mode TONE mode
Test KT. A
Operating Voltage
VDD
V
-
Operating Current
mA
All outputs unloaded
A
Standby Current
Iso
0.5 VIH VIL
R1 - R4 Input Current
10 1 0.2
HK = VSS
All outputs unloaded, no key selected
A
Input Current
0.8 0 115 584 456 730 570
VDD
IR VOC VOR
A 876 684 A mVp-p Column Row VDD = 3.5V RL = 5K
C D
Tone out Voltage
HFI Pull Low Current
IHFI
5
VDD = 3.5V (Note 1) HFI pin connected to 0V
B
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NT91214/15 Series
DC Electrical Characteristics (continued)
Parameter Symbol Min. Typ. Max. Unit Conditions VDD = 3.5V VOH = VDD - 0.4V VDD = 3.5V VOL = 0.4V Test KT. B
HFO Drive Current HFO, KT , MODEOUT XMITMUTE Sink Current
DP Sink Current
IOH1
0.4
2
mA
IOL1
0.9
5.3
mA
B
IOL2 DIS%
1.1
5.3 1 5
mA %
VDD = 3.5V , VOL = 0.4V * see note below
B
Distortion * Note: DIS% =
100 * (V12 + V 2 2 +...+ Vn 2 )1/2
(VIL2 + VIH 2 )1/2 1. V1. . . . Vn are the intermodulation or the harmonic frequencies in the 500Hz to 3400Hz band. 2. VIL and VIH are the individual frequency components of the DTMFsignal. (VDD = 3.5V, VSS = 0V, FOSC = 3.579MHz, Top = 25C, unless otherwise specified.) Symbol Min. Typ. 33.3 Max. Unit Conditions 10pps ms 20pps M/B = 1/2 M/B = 2/3 M/B = 1/2 M/B = 2/3 10pps ms 20pps M/B = 1/2 M/B = 2/3 M/B = 1/2 M/B = 2/3 ms 10pps 20pps sec
AC Characteristics
Parameter
Make Time
TM
40.0 16.7 20.0 66.6
Break Time
TB
60.0 33.3 30.0
Inter-digit Pause Time
TIDP
824 458
Pause Time
TPAU
2.2
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NT91214/15 Series
AC Characteristics (continued)
Parameter 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 Symbol TAOBK TD TKD TKLD TKTD FKT TMFD TTIDP TMFDR TTIDPR Min. Typ. 2.2 0 21 5.2 23 437 94 96 94 96 Max. Unit sec ms ms ms ms HZ ms ms ms ms Conditions * Optional
Comparisons of Specified vs. Actual Tone Frequencies
R/C
R1 R2 R3 R4 C1 C2 C3
Spec. 697 770 852 941 1,209 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
Conditions
Fosc = 3.579MHz
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NT91214/15 Series
Pin Descriptions
Pin No. NT91215A NT91214A 3 4 NT91215B NT91214B 3 4 NT91215C NT91214C 4 5 NT91215D NT91214D 4 5 Designation I/O Description
OSCI OSCO
I
Oscillator Input and Output pins The time base for the NT91214/15 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. TRI-STATE mode select pin There are two versions of the NT91214/15 as follows: a. NT91215 Series is for European and American systems. MODE IN VDD VSS Floating Tone/ Pulse Pulse Tone Pulse Dial Rate 10pps 10pps M/B Ratio 2/3 1/2
2
2
3
3
MODE IN
I, Z
b. The NT91214 Series is for the Japanese system. MODE IN VDD VSS Floating Tone/ Pulse Pulse Tone Pulse Dial Rate 10pps 20pps M/B Ratio 1/2 1/2
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.
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NT91214/15 Series
Pin Descriptions (continued)
Pin No. NT91215A NT91214A 1 NT91215B NT91214B 1 NT91215C NT91214C 2 NT91215D NT91214D 2 Designation I/O Description
HK
I
Hook switch input This inverter input pin detects the state of the hook switch contact. "Off Hook" is represented by a VSS condition. "On Hook" is represented by a VDD condition. 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, and P keys). The tone output frequency is 437Hz and tone duration is 23 ms. Dialing pulse output This is an N-channel open drain output. The normal output will be "ON" during break and "OFF" during make in the PULSE DIALING mode.
(N.A.)
10
(N.A.)
11
KT
O
9
11
10
12
DP
O
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NT91214/15 Series
Pin Descriptions (continued)
Pin No. NT91215A NT91214A NT91215B NT91214B NT91215C NT91214C 1 NT91215D NT91214D 1 Designation I/O Description
HFO
O
Hands-Free Control I/O pins These pins enable and disable the HandsFree 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: Current State Hook sw. HFO Input Next State HFO High Dialing? Yes
(N.A.)
(N.A.)
Low HFI High HFI High HFI Low High Off Hook On Hook On Hook
18
20
HFI
I
On Hook Off Hook On Hook Off Hook Off Hook
Low
No
Low
Yes
Low Low High
Yes No Yes
7
7
8
8
TONE
O
Tone dialing output When a valid keypress is detected in the DTMF mode, appropriate low group and high group, frequencies are generated which hybridizes the dual tone output. TONE output is in the "OFF" state in PULSE mode.
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NT91214/15 Series
Pin Descriptions (continued)
Pin No. NT91215A NT91214A 8 NT91215B NT91214B 8 NT91215C NT91214C 9 NT91215D NT91214D 9 Designation I/O Description
XMITMUTE
O
Dialing transmission mute output This is an N-channel open drain output The XMITMUTE is normally "OFF" During pulse of DTMF dialing this output is "ON". Mode output pin This is an N-channel, open drain output It is "ON" during tone output and "OFF" during pulse output. 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 to VSS.
(N.A.)
9
(N.A.)
10
MODE OUT
O
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
R1 R2 R3 R4 C1 C2 C3
VDD VSS
Power supply pins These devices are designed to operate from 2.0V to 5.5V.
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NT91214/15 Series
Operating Procedures
Symbol Definitions: In the description below, signals are defined in terms of the key or switch which is activated. OFF Hook means the phone is off the hook. b. On Hook
HFI
D1 . . . Dn
Pulse mode is defined as the INITIAL mode, provided the key input D1 is not */T while the mode selection 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
On Hook means that the phone is on the hook. D1 represents for the first digit dialed in a string of digits. Dn ( Dk ) represents for the last digit dialed in a string of digits. Dn+1 represents for the beginning of a new string of digits. Dn+m represents for the last digit in a new string of digits.
HFI
represents for the switch that activates the HANDS-FREE DIALING mode going low the DIALING mode from PULSE to DTMF after the first key entry. 2. DTMF mode operation a. Off Hook D1 . . . Dn or On Hook
HFI
*/T
is the Pulse-to-DTMF key
RD is the Redial key. 0 P F is the Zero key. is the Pause key. is the Flash key.
D1 . . . Dn DTMF mode is defined as the INITIAL mode if the mode selection pin MODE IN is VSS. b. Off Hook
HFI
Recommended Operation: 1. PULSE mode operation a. Off Hook D1 . . . Dn
*/T */T
D1 . . . Dn or On Hook D1 . . . Dn
PULSE mode is defined as the INITIAL mode, provided the first keyboard input is not the the is floating (MODE IN = VDD or floating). Off Hook */T key following
The INITIAL mode is PULSE mode if the mode selection pin, MODE IN, is VDD or floating. The */T key can switch the DIALING mode to TONE mode. Unlike NORMAL mode switching, the entry, */T key
condition and the mode selection pin
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V1.0
NT91214/15 Series
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 operations a and b, since the mode switching key, */T , will occupy one digit of space.
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V1.0
NT91214/15 Series
3. Manual dialing with automatic access pause The mode selection pin is alwsys checked for TONE a. Off Hook O P D1 . . . Dn or PULSE mode key entry. Dialing can be switched pause key entries can be accepted and stored in the from PULSE to TONE mode, but not from TONE to redial memory. Each is stored as a digit. PULSE mode. Switching the MODE IN pin to the Each key-in will provide a pause of 3.57 seconds, original digits plus the digits dialed after pressing will depending on which model is being used. 4. Redial a. On Hook RD or On Hook
HFI
cause the chip to store a RD
*/T
digit prior to the first
tone digit in the redial memory and will automatically insert a 2.2 second pause before the tone digits are
Up to 32 digits (in PULSE mode) or 31 digits dialed out. After the mode bas been switched, the (in TONE mode) can be dialed using the The RD RD key. status of the mode selection pin will no longer be key is disabled while PULSE or TONE checked. Therefore, it will not be possible to switch signals are being transmitted. Redial will also be from TONE to PULSE mode. inhibited if the last number dialed exceeds 32 digits because the redial memory can only hold 32 digits. b. Off Hook D1 ... Dn */T Dn+1
PULSE Mode b. Off Hook
HFI
RD RD
D1 . . . Dn or D1 . . . Dn
On Hook ... Dn+m
DTMF Mode After pressing the RD key, digits may be added to PULSE mode is initially defined with the mode 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 pressing the */T key. DTMF mode will being as soon the redial key is pressed, the stored number will be as the last pulse has been transmitted. In this mode, dialed exactly the same as it was previously, Dn+1 regardless of the status of the MODE IN pin. OUT pin as DTMF signals. If a 5. TONE/PULSE switching operation a. On Hook D1 . . . Dn MODE IN pin PULSE Mode pause will be added to the automatically inserted switched to VSS Dn+1 . . . Dn+m pause time, which is also 3.57 seconds. Both of the DTMF Mode 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 through Dn+m are sent through the TONE selection pin, MODE IN, equal to VDD or floating. At this time, the mode can be switched to DTMF by
12
V1.0
NT91214/15 Series
above switching modes can store as many as 31 digits in the redial memory.
13
V1.0
NT91214/15 Series
6. One-key redialing Off Hook D1 . . . Dn RD D1 to Dn is finished, pressing RD or On Hook
HFI
break of 96 ms or 640 ms (or, 297 ms or 640 ms, depending on the model) 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.
D1 . . . Dn If the dialing of
RD will cause the pulse dialing pin to go low for 1.67 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
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
pressing of the redial key will be ignored.
7. Flash dialing Off Hook
HFI
TONE/PULSE DIALING mode. F D1 D1 . . . Dn ... Dn or On Hook 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.
F
The flash keys emulate quick On-Off Hook operations. Pressing the flash keys, F1 or F2 , will cause a
Timing Waveforms
1. Timing Waveform in PULSE Mode:
H K or HFO
Key Input
2
1 T K D: d e b o u n c i n g t i m e 2 1 m s
3
KT T K T D (23 ms), f = 437Hz XMIT MUTE Td TM DP TM TB T IDP TM 21ms
Td: TIDP: TKTO: TKD: Note: high.
Delay time of Key valid to dialing signal out, typically 0ms Inter-digit pause time Key-in tone duration Debouncing time " HK " or "HFO" indicates chip works when hook switch " HK " goes low or Hands-Free control output HFO goes
14
V1.0
NT91214/15 Series
Timing Waveforms (continued)
2. Timing Waveform in TONE Mode: (i) Normal Dialing
H K or HFO
Key Input
4 T KD
3
*
9
KT XMIT MUTE Td 2.3ms TONE MODE OUT TMFD:94ms 2.5ms
2.3ms
2.3ms
T T I D P: 9 6 m s
(ii) After (i), Redialing
EI o EC
Iaeu Einoo
OA
IO UIEO IOOAE Oa OIAE OOEANO IAAE OO OICAO io
15
V1.0
NT91214/15 Series
Timing Waveforms (continued)
3. Timing waveform for SWITCHING Mode Operation: (i) By mode selection pin switches
H K or HFO Key Input MODE IN KT DP TM MODE OUT T IDP XMIT MUTE Td TONE T PAU T MFD T IDP TM
2 ****
3 ****
*/T
6 *******************
4
(ii) By */T key entry
EI o EC Iaeu Einoo IAAE EI IO AN OI IAAE OO UIEO IOOAE Oa OEAN OEAN OI
O
*

ONAO
OICA io io
OIAE
TPAU: Pause time (2.2 secs)
16
V1.0
NT91214/15 Series
Timing Waveforms(continued)
4. One Key Redial (DTMF mode used as example):
H K or HFO Key Input XMIT MUTE DP Td TONE MODE OUT 2.5ms
2
3
RD
T AOBK Td 2.5ms
TAOBK: Break time (2.2 secs)
5. Flash Dialing (DTMF mode used as example):
H K or HFO // Key Input XMIT MUTE DP MODE OUT // // T fsh // // T PAU TONE // 2.5ms 2.5ms F 6 4 3
Tfsh: flash time 96 or 640 ms (F1 or F2 respectively) for NT91215 flash time 297 or 640 ms (F1 or F2 respectively) for NT91214
17
V1.0
NT91214/15 Series
Application Circuit (for reference only)
EI OOEOAE
OEN A A OEIE I UIO x CC EI I EI I I I I I I oC I A (R)
I I EI I x (R) C I EAIAO COAEAE CC EI
I oC
C
I
C
xEAAE IAEOOOI

*
C C N O
O O O O
EC
AN
EI
xAA
EC OIAE
I
IO
I UIEO IOOAE
C
A
A
A
OA OA
xOO
IAAE EI
IAAE OO
IO xAA I
AINIECEAEO IAEOOOI
xAA IA 3/4 NOIOAE OIAE IA 3/4
ONAE
xAA
N N IEu AAEOAIEA OAEOIAOO
IAEA NEAEU
18
V1.0
NT91214/15 Series
Test Circuits
(A) (B)
(C)
(D)
OSCILLOSCOPE: TEKTRONI X 468 SPECTURM ANALYZER: HP3585A
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V1.0
NT91214/15 Series
Ordering Information
Part No. Key Tone Hands-Free Control N.A. N.A. A A N.A. N.A. A A 10pps 1/2 2/3 selectable 96 ms 640 ms 10/20pps 1/2 297 ms 640 ms Dial Rate M/B Ratio F1 Flash F2 16L DIP 18L DIP 18L DIP 20L DIP 16L DIP 18L DIP 18L DIP 20L DIP Package
NT91214A NT91214B NT91214C NT91214D NT91215A NT91215B NT91215C NT91215D
N.A. A N.A. A N.A. A N.A. A
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V1.0
NT91214/15 Series
Package Information DIP 16L Outline Dimensions
D 16 9
unit: inches/mm
E1
1 S
8 E C
A2
A
A1
Base Plane
Seating Plane B B1 e1 eA
L
Symbol A A1 A2 B
Dimensions in inches 0.175 Max. 0.010 Min. 0.1300.010 0.018 +0.004 -0.002 0.060 +0.004 -0.002 0.010 +0.004 -0.002 0.750 Typ. (0.770 Max.) 0.3000.010 0.250 Typ. (0.262 Max.) 0.1000.010 0.1300.010 0 ~ 15 0.3450.035 0.040 Max.
Dimensions in mm 4.45 Max. 0.25 Min. 3.300.25 0.46 +0.10 -0.05 1.52 +0.10 -0.05 0.25 +0.10 -0.05 19.05 Typ. (19.56 Max.) 7.620.25 6.35 Typ. (6.65 Max.) 2.540.25 3.300.25 0 ~ 15 8.760.89 1.02 Max.
B1
C D E E1 e1 L eA S
Notes: 1. The maximum value of dimension D includes end flash. 2. Dimension E1 does not include resin fins. 3. Dimension S includes end flash.
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V1.0
NT91214/15 Series
Package Information DIP 18L Outline Dimensions
unit: inches/mm
D 18 10
E1
1 S
9 E C
A2
A
A1
Base Plane
Seating Plane B B1 e1 eA
L
Symbol A A1 A2 B
Dimensions in inches 0.175 Max. 0.010 Min. 0.1300.010 0.018 +0.004 -0.002 0.060 +0.004 -0.002 0.010 +0.004 -0.002 0.900 Typ. (0.920 Max.) 0.3000.010 0.250 Typ. (0.262 Max.) 0.1000.010 0.1300.010 0 ~ 15 0.3450.035 0.055 Max.
Dimension in mm 4.45 Max. 0.25 Min. 3.300.25 0.46 +0.10 -0.05 1.52 +0.10 -0.05 0.25 +0.10 -0.05 22.86 Typ. (23.37 Max.) 7.620.25 6.35 Typ. (6.65 Max.) 2.540.25 3.300.25 0 ~ 15 8.760.89 1.40 Max.
B1
C D E E1 e1 L eA S
Notes: 1. The maximum value of dimension D includes end flash. 2. Dimension E1 does not include resin fins. 3. Dimension S includes end flash.
22
V1.0
NT91214/15 Series
Package Information DIP 20L Outline Dimensions
D 20 11
unit: inches/mm
E1
1 S
10 E C
A2
A
A1
Base Plane
Seating Plane B B1 e1 eA
L
Symbol A A1 A2 B
Dimensions in inches 0.175 Max. 0.010 Min. 0.1300.010 0.018 +0.004 -0.002 0.060 +0.004 -0.002 0.010 +0.004 -0.002 1.026 Typ. (1.046 Max.) 0.3000.010 0.250 Typ. (0.262 Max.) 0.1000.010 0.1300.010 0 ~ 15 0.3450.035 0.078 Max.
Dimensions in mm 4.45 Max. 0.25 Min. 3.300.25 0.46 +0.10 -0.05 1.52 +0.10 -0.05 0.25 +0.10 -0.05 26.06 Typ. (26.57 Max.) 7.620.25 6.35 Typ. (6.65 Max.) 2.540.25 3.300.25 0 ~ 15 8.760.89 1.98 Max.
B1
C D E E1 e1 L eA S
Notes: 1. The maximum value of dimension D includes end flash. 2. Dimension E1 does not include resin fins. 3. Dimension S includes end flash.
23
V1.0

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