Page 1
UNIVERSAL 15 MEMORY DIALER S5T5855A
1
INTRODUCTION
The S5T5855A is 15 memory Tone/pulse switchable dialer with 32 digit
redial memory. 16 digit indirect 10 memory and 16 digit direct 4
memory are possible.
The Flash time is selectable on the keypad Also, Hands-Free and Hold
functions are controlled on the keypad. The S5T5855A can fulfill all the
standards of each country.
FEATURES
• Flash Time selectable on the keyboard (100, 303, 604 mS)
• Hands-Free and Hold functions
• Tone/Pulse switchable
• 16 digit indirect (Two-touch) 10 memory (Pulse: 16 digit, Tone: 15 digit)
• 16 digit direct (One-touch) 4 memory (Pulse: 16 digit, Tone: 15 digit)
• Uses 3.579545MHz Color burst Crystal or ceramic resonator
• Pulse rate selectable. (10 pps, 20 pps)
• Make/Break ratio selectable (40: 60, 33 : 66)
• Single tone enable for test
• Tone (T/•) key function (Pulse → Tone)
• Redial function (Pulse : 32 digit, Tone: 31 digit)
• Pin compatible with S5T5820C, S5T0080A, and S5T5850
ORDERING INFORMATION
*HFD : Hands Free Dialing Function
*HOLD : Hold for Melody
*EM : Emergency Memory
Device Package
Function
HFD HOLD EM Flash Time M/B Ratio PPS
S5T5855A01-D0B0 22−DIP−400 O O O Selectable Selectable Selectable
22−DIP−400
Page 2
S5T5855A UNIVERSAL 15 MEMORY DIALER
2
BLOCK DIAGRAM
OSC DIVIDER
M/B
COUNTER
PULSE
COUNTER
CONTROL
CIRCUIT
SYSTEM
CLOCK
TIMING
COUNTER
DEBOUNCE
CIRCUIT
KEY
INPUT
INTERFACE
CIRCUIT
RECALL/LOCATION
LATCH & ADDRESS
COUNTER
REDIAL
RAM
DATA
LATCH
14 MEMORY
STORE RAM
ROW, COLUMN
SINEWAVE
COUNTER &
D/A CONVERTER
WRITE/READ
ADDRESS
COUNTER
HANDS FREE & HOLD
CONTROL OUTPUT
OSCI
OSCO
M/B
HS
MDS/DRS
C1
C2
C3
C4
C5
R1
R2
R4
R3
R5
V
DD
DP
TONE
HFO V
SS
HDO
X’ MUTE
4
4
Page 3
UNIVERSAL 15 MEMORY DIALER S5T5855A
3
PIN CONFIGURATION
ARRANGEMENT OF KEY BOARD
SELECTION FUNCTION
PIN CONNECTION FUNCTION
V
DD
PULSE MODE/20 PPS
MDS/DRS OPEN PULSE MODE/10 PPS
V
SS
TONE MODE
MAKE/BREAK V
DD
1 : 2 (M : B)
V
SS
2 : 3 (M : B)
1
2
3
4
5
6
7
8
9
12
13
14
15
16
17
18
19
20
S5T5855A
R5
R1
R2
R3
R4
HS
M/B
MDS/DRS
OSCI
C3
C2
C1
DP
V+
V
SS
V
DD
HDO
10
11
OSCO
C5
21
22
HFO
C4
X’ MUTE
1 2 3 ST EM1
4 5 6 R/L EM2
7 8 9 RD/P EM3
T/• 0 # F3 EM4
HFI HDI F1 F2 NU
− RD/P
: Redial/Pause
− ST
: Store
− R/L
: Recall/Location
− F1
: Flash Time (100ms)
− F2
: Flash Time (303ms)
− F3
: Flash Time (604md)
− HFI
: Hands-Free Dialing Key Input
− HDI
: Hold Key Input
− T/•
: Pulse → Tone Mode
− #
: RD/P Function in Pulse Mode Data in Tone Mode
− EMI
: Direct Memory Location I = 1, 2, 3, 4.
− Nu
: Not Used Key
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S5T5855A UNIVERSAL 15 MEMORY DIALER
4
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
Pin No Symbol I/O Description
1 R5
2 R1
3 R2 I Row key input
4 R3
5 R4
6 HS I Hook switch
7 M/B I Make/Break select
8 MDS/DRS I Mode & dial pulse ratio select pin
9 OSCI I Oscillator input
10 OSCO O Oscillator output
11 C5 I Column 5 input
12 HDO O Hold function control output
13 V
DD
S (+) Power
14 V
SS
S (−) Power
15 TONE O Tone output
16
X’MUTE O X’MUTE Output (N-channel open drain)
17 DP O Dial pulse output (C-MOS inverter output)
18 C1
19 C2 I Column key input
20 C3
21 C4
22 HFO O Hands-free control output
Characteristic Symbol Value Unit
Supply Voltage V
DD
− 0.3 to 7.0 V
Input Voltage V
I
− 0.2 to VDD + 0.3 V
Output Voltage V
O
− 0.3 to VDD + 0.3 V
Power Dissipation P
D
500 mW
Operating Temperature T
OPR
− 20 to + 70 °C
Storage Temperature T
STG
− 55 to + 150 °C
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UNIVERSAL 15 MEMORY DIALER S5T5855A
5
ELECTRICAL CHARACTERISTICS
(VDD = 3.5V, VSS = 0V, Ta = 25°C , f
osc
= 3.579545MHz)
Characteristic Symbol Test conditions Min. Typ. Max. Unit
Operating Voltage V
DD
− 2.0 − 6.0
V
Memory Retention Voltage V
MR
− 1.0 − −
Memory Retention Current
I
MR
HS = V
DD
= 1.0V
− 0.05 0.1 uA
Operating Current
I
DD(PULSE)
All output
unload
Pulse Mode − 0.1 0.3
mA
I
DD(TONE)
Tone Mode − 0.4 0.7
Standby Current
I
SB
HS = V
SS
− 10 50 µA
Output Sink Current
I
O(SINK)1VOL
= 0.4V
1.7 5.0 − mA
(DP, X’MUTE)
I
O(SINK)2VOL
= 0.4V, V
DD
= 2.5V
0.5 1.5 − mA
Output Current
I
OH
V
OH
= 0.3V
1.8 5.2 − mA
I
OL
V
OL
= 0.4V
1.7 5.1 − mA
Input Voltage
V
IH
R1 to R5, M/B, HS 0.8V
DD
− V
DD
V
V
IL
C1 to C5, MDS/RDS, HS V
SS
− 0.2V
DD
V
Input Current
I
I1
R1 to R5, V
IN
= V
SS
− − 50 µA
I
I2
R1 to R5, V
IN
= V
SS VDD
= 2.5V
− − 30 µA
Column to Row Tone Ratio dBcr Tone Mode 1 2 3 dB
Row Tone Output
V
OH(TONE)RL
= 5.0Kohm
−18 − −16
dBV
V
OL(TONE)VDD
= 2.5V, RL = 5.0Kohm
−18 − −16
Tone Distortion THD − − 1 4 %
Valid Key Entry Time t
KD
− − 33.3 − mS
Pause Time t
PA
P Key Depress − 3.6 − Sec
Pulse Interdigit
t
PIDP1
MDS/DRS = V
DD
(20 PPS)
− 600 −
Pause Time t
PIDP2
MDS/DRS = OPEN(10 PPS) − 800 −
Tone interdigit pause time
t
TIDP
MDS/DRS = V
SS
− 103.5 − mS
Tone Duration t
TD
− − 101 −
Pulse to tone auto pause time t
PTPA
− − 3.6 −
Make/Break Time
t
M/B
MDS/DRS =
OPEN (10 PPS)
M/B = V
DD
− 33.5/67.0 −
mS
M/B = V
SS
− 40.2/60.3 −
MDS/DRS =
VDD (20 PPS)
M/B = V
DD
− 16.7/33.5 −
M/B = V
SS
− 20.1/30.2 −
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S5T5855A UNIVERSAL 15 MEMORY DIALER
6
APPLICATION INFORMATION KEY DESCRIPTION
• 1, 2, 3, 4, 5, 6, 7, 8, 9, 0
These are Tone/Pulse dialing signal keys in normal mode.
• T/
∗
Pulse Mode : Pulse to Tone Switching Key
Tone Mode : Data Key
• #
Pulse Mode : No Operation
Tone Mode : Data key
• EM1, EM2, EM3, EM4
DIRECT REPERTORY DIALING KEY.
The cascade 32 digit dialing is available and the exceed 32 digit dialing accepted one by one after all 32 digits
is dialed out.
In store mode, pressing EM1 to EM4 key will cause the 16 digits of buffer memory storing to corresponding
repertory memory.
• RD/P KEY
If press this key first after off- hook, it will operate as a redial key, otherwise it will operate as a pause key.
• ST : Store
This key will accept as store key if press it first key after off or on - hook.
The store mode will be released by pressing this key again or hooking once.
• R/L
This key will be allowed recall or location selection in indirect memory operation
Pre-digit Pause Time
t
PTPA
MDS/DRS = VDD, M/B = V
DD
− 17 −
mS
MDS/DRS = OPEN, M/B = V
DD
− 37 −
MDS/DRS = VDD, M/B = V
SS
− 20 −
MDS/DRS = OPEN, M/B = V
SS
− 30 −
Pulse to X’MUTE overlap time
t
PMO
− − 3.0 − mS
Flash Time
t
FL
F1 Key Depress − 100 −
F2 Key Depress − 303 − mS
F3 Key Depress − 604 −
Characteristic Symbol Test conditions Min. Typ. Max. Unit
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UNIVERSAL 15 MEMORY DIALER S5T5855A
7
• F : Flash (i = 1, 2,3)
If the Flash key pressed, DP and X’MUTE will be forced to low during the t
FL
(Flash Time)
• HFI
Hands-Free dialing input.
Hands-Free dialing output controlled by the keyboard (HFl)
• HDI
Hold function input.
Hold function controlled by the keyboard (HDl).
The output will control the melody enable.
KEYBOARD AND SWITCHE OPERATION
• SYMBOL DEFINITION
DP = PULSE DATA: 0,1,2,3,4,5,6,7,8,9,F, PAUSE
Dt = TONE DATA: 0,1,2,3,4,5,6,7,8,9, *,#,F, PAUSE
EM1 ~ EM4 = DIRECT MEMORY
REC = RECALL
LOC = LOCATION
ZiZiZi = Conversation Mode
OFF= OFF−HOOK
ON = ON-HOOK
= INPUT LEVEL LOW TO HIGH
= INPUT LEVEL HIGH TO LOW
• OPERATION MANUAL
− NORMAL DIALING IN PULSE MODE
OFF: Dp,−, Dp, : ZiZiZi: ON
− NORMAL DIALING IN TONE MODE
OFF: Dt,−, Dt, : ZiZiZi : ON
− NORMAL DIALING FROM PULSE TO TONE VIA T/* KEY
OFF: Dp,−, Dp, T/*, Dt, : ZiZiZi : ON
− NORMAL DIALING FROM PULSE TO TONE VIA MDS/DRS SWITCH
OFF: Dp,−, Dp, MDS/DRS, , D
t ,
----,Dt : ZiZiZi : ON
− REDIAL
OFF: RD/P : ZiZiZi : ON
NOTES :
1.All the key input will be ignored during the redial.
2.if the dialing digits exceed 32 digits, the redialing operation will be inhibited)
3.Cascade dialing (normal dialing after redialing) will be accepted.
F1 100mS
Flach time selectable on the keyboardF2 303mS
F3 604mS
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S5T5855A UNIVERSAL 15 MEMORY DIALER
8
− REPERTORY DIALING FOR CASCADED MEMORY
OFF:EMI (i =1,2,3,4) : ZiZiZi : ON: DIRECT
OFF: REC, LOCx (x=1,2,-, 0): ZiZiZi : ON : INDIRECT
− REPERTORY DIALING FOR CASCADED MEMORY
The cascade 32 digit dialing is available and exceed 32 digit dialing accepted one by one after all 32 digits are
dialed out.
NORMAL DIALING AFTER REPERTORY DIALING
OFF: EMI (i = 1,2,3,4) or REC, LOCx (x = 1,2,−, 0),
Dg,−, Dg, : ZiZiZi : ON
− STORE
ON/OFF, ST, Dg,-, Dg EMI OR LOCx
Store mode will be released by pressing store key again or hooking once.
− STORE
ON/OFF, ST, Dg,-, Dg, EMI OR LOCx
Store mode will be released by pressing store key again or hooking once.
− CHANGING STORE DATA VIA F KEY
ON/OFF, ST, D1 ,D2,D3,F,D4,D5,D6, -, Dn, EMI or LOCx
In above dialing sequence, the storing data are D4,D5,D6,Dn.
− HANDS FREE DIALING
ON : HFI, D1, D2,−, Dn, : OFF : ZiZiZi : ON
ON : HFI, D1, D2,−, Dn, HFI,RD
− HOLD FUNCTION
This pin controls the melody output enable and disable.
(Refer to state diagram of hands-free dialing & hold function)
TRUTH TABLE OF HANDS-FREE INPUT & HOLD FUNCTION
*Comment :
X : Don’t Care
P : Previous State
NO
CURRENT STATE
INPUT
NEXT STATE
HOOK STATE HFO HDO HFO HDO DIALING
1
2
3
4
5
6
7
8
9
10
11
12
13
ON/OFF HOOK
ON HOOK
OFF HOOK
ON HOOK
OFF HOOK
OFF HOOK
OFF HOOK
ON HOOK
ON HOOK
ON HOOK
OFF HOOK
OFF HOOK
ON/OFF HOOK
L
H
H
X
X
L
H
L
H
H
X
X
X
L
L
L
X
H
L
L
X
L
H
L
H
H
HFI KEY IN
HFI KEY IN
HFI KEY IN
OFF HOOK
ON HOOK
ON HOOK
ON HOOK
HDI KEY IN
HDI KEY IN
HDI KEY IN
HDI KEY IN
HDI KEY IN
HDI KEY IN
H
L
L
L
P
L
H
L
H
H
P
P
P
L
L
L
L
P
L
L
P
H
L
H
L
H
YES
NO
YES
YES
MELODY ON
NO
YES
NO
MELODY ON
YES
MELODY ON
YES
MELODY ON
Page 9
UNIVERSAL 15 MEMORY DIALER S5T5855A
9
TIMING DIAGRAM
PULSE MODE
TONE MODE
HS
KEY INPUT
DP
1 2 F RD
X’ MUTE
t
PDPA
t
B
t
M
t
PMO
t
PMO
t
PIDP
t
FL
1 P 3 RD
TONE
HS
KEY INPUT
X’ MUTE
t
PA
t
PA
t
TD
Page 10
S5T5855A UNIVERSAL 15 MEMORY DIALER
10
PULSE TO TONE DIALING
HANDS-FREE DIALING & HOLD FUNCTION
X’ MUTE
HS
KEY INPUT
MDS/DRS
DP
TONE
1 2 3 4
3 4
t
PTPA
HS
HDI
KEY
INPUT
HDO
KEY INPUT
DP
HDI
KEY INPUT
HDO
X’ MUTE
1 2 5 1
Page 11
UNIVERSAL 15 MEMORY DIALER S5T5855A
11
APPLICATION CIRCUIT
R5R1R2R3R4
HS
HFO
C4C3C2
C1
DP
MB MUTE
MODE TONE
OCI GND
OCO VDD
KIT HOLDO
1
23465
7
8
9
10
11
222120
19
18
17
16
15
14
13
12
8 7 6 5
RING
TIP RC AVA OUT
GND SWP OFC
1 2 ST3 EM1
4 5 R/L6 EM2
7 8
RD/P
9 EM3
T/' 0 F3# EM4
HR
HDI
F2F1
S5T5855A
321
VL
1
2
CI
CO
3
4 BIAS
5
MFI
MUTE
6
7VR8
GND
VCC
16
RXO
15
RFO
13
RXI
14CC12
MIC
11
MIC+
TOF
10
9
8
IC5
7 6 5
S1T8602B
Mute Out GND
INT1 INT2 OUT VCC
TIP
RING
BRIDGE-D
R1
2M
SW1
A1156
R2
150K
<H/S>
R3
470K
C1
1µF-250V
R4
300K
R5
1M
Q2
C945
C4
104
R6
470K
R8
6.8K
C2
10µF
S1T2418G01
C2
1 2 3 4
104
R9
22K
PIEZO
1 2 3 4
C21
4.7µ
R34 51K
C11331
C18
1000µ
Z-2
7V
Z-1
C5
470
µ
SW2
SW3
Q3
C1009Y
S5T5855A
R10
100K
R17
330
D2
1.5-T1
3H
R20
6.2K
R25
5.1K
R24 620
R26
10K
C8
104
C9
220
µ
R18
100K
D3
R21
150
R22
43
R23
15
D4
R13
120K
R11
47K
R12
470K
Q4
C945
R14
20K
C6
104
R15
5.1K
R19
8.2K
C7
123
R16
47K
Q5
C945
MEMORY
KS531A
C10
22µ
D5
100K
R33
100K
C22
22µ
R36
330
R35
33K
C33
103
C14
0.33µ
R37
3.3K
VR
100K
R39
20K
C16
104
C15
330
R38
390K
C17
1µ
MIC
SW4
R40
1K
R20
104
R41
560
C19
22µ
R42
3K
D1
Page 12
S5T5855A UNIVERSAL 15 MEMORY DIALER
12
NOTES
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