SM1125 series
Multimelody IC for Pagers
OVERVIEW
The SM1125 series are melody ICs fabricated in NPC’s Molybdenum-gate CMOS for use in mobile telecom-
munications equipment. A maximum of 16 melodies can be stored in programmable ROM.
FEATURES
I
PINOUT
(Top view)
OSC
SI
SC
ST
1
2
3
4
8
7
6
5
VSS
VDD
MTO
TEST
I
I
I
I
I
I
I
Maximum of 16 melody selections (with up to 512
steps)
Level hold playback mode
External reference clock input versions and built-
in RC oscillator versions available, set by master-
slice option (RC oscillator versions require an
external resistor and capacitor).
12 selectable clock frequencies (fixed for all melo-
dies)
• External clock input versions (12 frequencies)
- 32.768kHz system: 32.768, 65.536 and
131.072kHz
- 37.5kHz system: 37.5, 75.0 and 150.0kHz
- 38.4kHz system: 38.4, 76.8 and 153.6kHz
- 48.0kHz system: 48.0, 96.0 and 192.0kHz
• Built-in oscillator versions (4 frequencies)
- 38.4kHz (standard oscillator frequency)
- 32.768kHz
- 37.5kHz
- 48.0kHz
2-pin serial data melody selection and 1-pin mel-
ody playback control
Power save function
• External clock input versions
Clock gating in no-play modes
• Built-in RC oscillator versions
Oscillator stopped in no-play modes
Molybdenum-gate CMOS process
8-pin plastic VSOP package
PACKAGE DIMENSIONS
(Unit: mm)
4.4 ± 0.2
6.4 ± 0.3
0.575 TYP
3.1 ± 0.3
1.15 ± 0.05
0.15
−
0.05
+ 0.1
0.65
0.10
0.22 ± 0.1
0.1 ± 0.05
+
0.12 M
ORDERING INFORMATION
Device
SM1125××V
Package
8pin VSOP
SEIKO NPC CORPORATION —1
0.5 ± 0.2
SM1125 series
BLOCK DIAGRAM
OSC
OSC
Gate
Master slice
VSS
1/2 or 1/4
SW2
VDD
SW1
Divider
1/128
Scale
Counter
MTO
SI
SC
ST
Control
Circuit
Scale
ROM
Main
ROM
TEST
Tempo Latch
Rhythm
Counter
Multi-
Plexer
Tempo Counter
Address
Counter
Start
Address
Latch
PIN DESCRIPTION
Number
1
2
3
4
5
6
7
8
Name
OSC
SI
SC
ST
TEST
MTO
VDD
VSS
I/O
I
I
I
I
I
O
–
–
Function
Built-in RC oscillator option: External resistor and capacitor connection pins
External clock input option: External reference clock input (gate circuit built-in)
Playback control serial interface data input
Playback control serial interface clock input
Playback start/stop control signal input
Test input pin. Leave open or tie to VSS. (Pull-down resistance built-in)
Playback melody signal output
Supply pin (+)
Ground pin
SEIKO NPC CORPORATION —2
SM1125 series
SPECIFICATIONS
Absolute Maximum Ratings
Parameter
Supply voltage range
Input voltage range
Power dissipation
Storage temperature range
Symbol
V
DD
−
V
SS
V
IN
P
D
T
stg
Condition
Rating
−
0.3 to 5.0
V
SS
−
0.2 to V
DD
+ 0.2
100
−
40 to 125
Unit
V
V
mW
°C
Recommended Operating Conditions
V
SS
= 0V
Parameter
Supply voltage
Operating temperature
Symbol
V
DD
T
opr
Condition
Rating
2.0 to 3.6
−20
to 70
Unit
V
°C
DC Characteristics
Unless otherwise noted Ta =
−20
to 70°C, V
SS
= 0V, V
DD
= 1.5 to 3.6V
Rating
Parameter
Supply voltage (1)
Supply voltage (2)
Current consumption (1)
Current consumption (2)
Current consumption (3)
Symbol
V
DD1
V
DD2
I
DD1
I
DD2
I
DD3
V
IH
V
IL
I
IH1
Input current (1)
I
IL1
Input current (2)
Open voltage
Output voltage
I
IH2
V
OPN
V
OH
V
OL
Oscillator frequency
Frequency stability
Oscillator start voltage
Oscillator stop voltage
f
OSC
∆f/f
V
DOB
V
DOS
Condition
min
External clock input option
Built-in RC oscillator option
Non-playback mode, Ta = 25°C
External clock input option: Playback mode,
MTO pin open
Built-in RC oscillator option: Playback mode,
MTO pin open
ST, SI, SC and OSC (External clock input
option) pins
ST, SI, SC and OSC (External clock input
option) pins, V
IH
= V
DD
, Ta = 25°C
ST, SI, SC and OSC (External clock input
option) pins, V
IL
= 0 V, Ta = 25°C
TEST pin, V
IH
= V
DD
TEST pin
MTO pin, I
OH
= 1mA
MTO pin, I
OL
= 1mA
Built-in RC oscillator option: NPC test board
measurement, R
O
= 91kΩ, C
O
= 200pF
V
DD
= 2.0 to 3.6V
Built-in RC oscillator option
Built-in RC oscillator option
Built-in RC oscillator option
1.5
2.0
–
–
–
V
DD
−
0.2
V
SS
–
–
–
–
V
DD
−
0.4
V
SS
34.5
–
–
–
typ
3.0
3.0
–
25
215
–
–
–
–
–
–
–
–
38.4
0.1
–
–
max
3.6
3.6
0.5
200
600
V
DD
V
SS
+ 0.2
0.5
0.5
200
0.1
V
DD
V
SS
+ 0.4
42.5
–
1.6
1.6
V
V
µA
µA
µA
V
V
µA
µA
µA
V
V
V
kHz
%/0.1V
V
V
Unit
Input voltage
SEIKO NPC CORPORATION —3
SM1125 series
AC Characteristics
Unless otherwise noted Ta =
−20
to 70°C, V
SS
= 0V, V
DD
= 1.5 to 3.6V
Rating
Parameter
OSC pulse cycle
OSC HIGH-level pulsewidth
OSC LOW-level pulsewidth
OSC pulse rise time
OSC pulse fall time
SC pulse cycle
SC HIGH-level pulsewidth
SC LOW-level pulsewidth
SC pulse rise time
SC pulse fall time
SI-SC setup time
SI-SC hold time
Symbol
t
OSC
t
OWH
t
OWL
t
Or
t
Of
t
SC
t
SWH
t
SWL
t
Sr
t
Sf
t
DS
t
DH
“SC-SI serial input pulse” timing
2.0
–
–
µs
“SC input pulse” timing
“OSC input pulse (External clock
input option)” timing
Condition
min
5.0
2.0
2.0
–
–
5.0
2.0
2.0
–
–
2.0
typ
–
–
–
–
–
–
–
–
–
–
–
max
–
–
–
200
200
–
–
–
200
200
–
µs
µs
µs
ns
ns
µs
µs
µs
ns
ns
µs
Unit
OSC input pulse (External clock input option)
V
IH
0.5V
DD
V
IL
t
Or
0.9V
DD
0.1V
DD
t
OWH
t
OSC
t
OWL
t
Of
SC input pulse
V
IH
0.5V
DD
V
IL
t
Sr
0.9V
DD
0.1V
DD
t
SWH
t
SC
t
SWL
t
Sf
SC-SI serial input pulse
V
IH
0.5V
DD
V
IL
t
DS
SI
SC
t
DH
V
IH
0.5V
DD
V
IL
SEIKO NPC CORPORATION —4
SM1125 series
FUNCTIONAL DESCRIPTION
Control Functions
Reference clock
SM1125 series devices are available in external clock input versions and built-in RC oscillator versions, set by
master-slice option. In the case of the built-in RC oscillator option, an external resistor and capacitor is
required for the oscillator function.
SM1125 series can operate at 12 selectable reference clock frequencies. All melodies playback at the fixed
speed set by the reference clock frequency. External clock input versions operate at one of 12 selectable clock
frequencies, as shown in table 1. Built-in RC oscillator versions operate at one of 4 selectable oscillator fre-
quencies—32.768kHz, 37.5kHz, 38.4kHz (standard frequency) and 48.0kHz.
Table 1. Reference clock frequencies
Frequency
system
32.768kHz
37.5kHz
38.4kHz
48.0kHz
Selectable frequencies
32.768kHz
37.5kHz
38.4kHz
48.0kHz
65.536kHz
75.0kHz
76.8kHz
96.0kHz
131.072kHz
150.0kHz
153.6kHz
192.0kHz
In external clock input versions, the external reference clock input is used during playback mode only and is
otherwise ignored. If a clock signal is input when not in playback mode (when ST is LOW), the gate circuit
switches to cutoff the external reference clock signal from entering the device, preventing unwanted current
flow.
In built-in RC oscillator versions, the oscillator is stopped when not in playback mode (when ST is LOW), pre-
venting unwanted current flow.
ST
OSC
Figure 1. External clock input version: Input during playback mode only
ST
OSC
Figure 2. External clock input version: Input during non-playback mode
ST
OSC
CR
Oscillator
Figure 3. Built-in RC oscillator version
SEIKO NPC CORPORATION —5
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