SM1124 Series
NIPPON PRECISION CIRCUITS--1
NIPPON PRECISION CIRCUITS INC.
Multimelody IC for Pagers
OVERVIEW
The SM1124 Series are melody pager multi-melody
ICs fabricated in NPC's Molybdenum-gate CMOS.
A maximum of 16 tunes can be stored in
programmable ROM, and the Molybdenum-gate
CMOS process realizes small-sized packages and
low power dissipation.
FEATURES
s
Maximum of 16 tune selections (with up to 512
steps)
s
Level hold playback mode
s
External reference clock input. The frequency can
be selected from the following 12 settings.
Playback frequency of each song varies (8
frequencies)
- 32.768 kHz system: 32.768 and 65.536 kHz
- 37.5 kHz system: 37.5 and 75.0 kHz
- 38.4 kHz system: 38.4 and 76.8 kHz
- 48.0 kHz system: 48.0 and 96.0 kHz
Playback frequency of all songs is fixed (4
frequencies)
- 32.768 kHz system: 131.072 kHz
- 37.5 kHz system: 150.0 kHz
- 38.4 kHz system: 153.6 kHz
- 48.0 kHz system: 192.0 kHz
s
2-pin serial data tune selection
s
Power save function
s
External clock gating in non-play mode.
s
2.4 to 3.6 V supply voltage
s
8-pin plastic SOP package
s
Molybdenum-gate CMOS process
PINOUT
8-pin SOP
PACKAGE DIMENSIONS
Unit: mm
CLK
SI
SC
ST
VSS
VDD
MTO
TEST
1
4
5
8
124
4.4 0.2
6.2 0.3
0.4 0.1
1.27
0.05 0.05
1.5 0.1
0.4 0.2
0 10
5.2 0.3
0.15
+
0.10
-
0.05
0.695TYP
SM1124 Series
NIPPON PRECISION CIRCUITS--2
BLOCK DIAGRAM
PIN DESCRIPTION
SPECIFICATIONS
Absolute Maximum Ratings
N u m b e r
N a m e
I/O
Function
1
CLK
I
External reference clock input (Schmitt-trigger circuit and gate circuit built-in)
2
SI
I
Playback control serial interface data input pin
1
1. Pins SI, SC and ST have a built-in Schmitt-trigger circuit.
3
SC
I
Playback control serial interface clock input pin
1
4
ST
I
Playback start/stop control signal input pin
1
5
TEST
I
Test input pin. Leave open or tie to VSS. (Pull-down resistance built-in)
6
MTO
O
Playback signal output pin
7
VDD
Supply pin (+)
8
VSS
Ground pin
P arameter
S y m b o l
Condition
Rating
Unit
Supply voltage range
V
DD
-
0.3 to 5.0
V
Input voltage range
V
IN
V
SS
-
0.2 to V
DD
+ 0.2
V
Power dissipation
P
D
150
mW
Storage temperature range
T
stg
-
40 to 125
C
Soldering temperature
T
sld
255
C
Soldering time
t
sld
10
s
Gate
1/2 or 1/4
SW
Divider
1/128
Scale
Counter
Scale
ROM
Tempo
Latch
Tempo
Counter
Rhythm
Counter
Address
Counter
Start
Address
Latch
Main
ROM
Control
Circuit
CLK*
SI*
SC*
ST*
VSS
VDD
MTO
TEST
Multi-
plexer
*: Built-in Schmmit-Triger Circuit.
SM1124 Series
NIPPON PRECISION CIRCUITS--3
Recommended Operating Conditions
V
SS
= 0 V unless otherwise specified
DC Characteristics
T
a
=
-
20 to 70
C, V
SS
= 0 V, V
DD
= 2.4 to 3.6 V unless otherwise specified
AC Characteristics
T
a
=
-
20 to 70
C, V
SS
= 0 V, V
DD
= 2.4 to 3.6 V unless otherwise specified
P arameter
S y m b o l
Condition
Rating
Unit
m i n
typ
m a x
Supply voltage
V
DD
2.4
3.6
V
Operating temperature
T
opr
-
20
70
C
P arameter
S y m b o l
Condition
Rating
Unit
m i n
typ
m a x
Supply voltage
V
DD
2.4
3.0
3.6
V
Current consumption (1)
I
DD1
Non-playback mode, 25
C
0.5
A
Current consumption (2)
I
DD2
Playback mode, MTO pin
open
25
200
A
Input voltage
V
IH
ST, SI, SC and CLK pins
V
DD
-
0.2
V
DD
V
V
IL
V
SS
V
SS
+ 0.2
V
Hysteresis width
V
T
0.2
1.0
V
Input current
I
IH1
ST, SI, SC and CLK pins,
V
IH
= V
DD
, 25
C
0.5
A
I
IL1
ST, SI, SC and CLK pins,
V
IL
= 0 V, 25
C
0.5
A
I
IH2
TEST pin, V
IH
= V
DD
200
A
Open voltage
V
OPN
TEST pin
0.1
V
Output voltage
V
OH
MTO pin, I
OH
= 1 mA
V
DD
-
0.4
V
DD
V
V
OL
MTO pin, I
OL
= 1 mA
V
SS
V
SS
+ 0.4
V
P arameter
S y m b o l
Condition
Rating
Unit
m i n
typ
m a x
CLK pulse cycle
t
CLK
"CLK input clock" timing
5.0
s
CLK HIGH-level pulsewidth
t
CWH
2.0
s
CLK LOW-level pulsewidth
t
CWL
2.0
s
SC pulsewidth
t
SC
"SC input clock" timing
5.0
s
SC HIGH-level pulsewidth
t
SWH
2.0
s
SC LOW-level pulsewidth
t
SWL
2.0
s
SI-SC setup time
t
DS
"Serial input" timing
2.0
s
SI-SC hold time
t
DH
2.0
s
SM1124 Series
NIPPON PRECISION CIRCUITS--4
CLK input clock
SC input clock
Serial input
FUNCTIONAL DESCRIPTION
Control Functions
External reference clock
The SM1124 can operate at 12 selectable external
reference clock frequencies. Of these, 8 are
selectable for each tune. When multiple external
clock frequencies are input to a single IC, the clock
must be switched during playback mode. Note that
when the frequency in parentheses is selected, all
tunes can only be played using that single fixed
frequency.
32.768 kHz system: 32.768 kHz, 65.536 kHz,
(131.072 kHz)
37.5 kHz system: 37.5 kHz, 75.0 kHz,
(150.0 kHz)
38.4 kHz system: 38.4 kHz, 76.8 kHz,
(153.6 kHz)
48.0 kHz system: 48.0 kHz, 96.0 kHz,
(192.0 kHz)
V
IH
V
IL
CWH
t
CWL
t
CLK
t
0.5V
DD
CLK
V
IH
V
IL
SWH
t
SWL
t
SC
t
0.5V
DD
SC
V
IH
V
IL
0.5V
DD
SC
V
IH
V
IL
0.5V
DD
SI
DS
t
DH
t
The external reference clock input is used at any time
as well as during playback mode. 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.
SM1124 Series
NIPPON PRECISION CIRCUITS--5
Input during playback mode only
Input during non-playback mode
Playback control
The ST pin controls the start of playback. While ST
is HIGH (VDD), the tune is played repeatedly, and
when ST goes LOW (VSS), playback stops. Tunes
are selected by the input serial data on pins SI and
ST
CLK
ST
CLK
SC. The final 4 bits form the valid selection data, and
this data is retained even after playback.
If serial data is input during playback, the SM1124
ignores this data and playback continues.
* Pin SC should be LOW when either a LOW-to-HIGH or HIGH-to-LOW transition occurs on pin ST.
,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,,,
SI
SC
ST
MTO
B3 B2 B1 B0
Invalid
Data
Valid
Data
Invalid
Data
Serial data selection
1
B 3
B 2
B 1
B 0
S T
Music selection
L
L
L
L
L
H
1st tune
L
L
L
H
L
H
2nd tune
L
L
H
L
L
H
3rd tune
L
L
H
H
L
H
4th tune
L
H
L
L
L
H
5th tune
L
H
L
H
L
H
6th tune
L
H
H
L
L
H
7th tune
L
H
H
H
L
H
8th tune
1. H = VDD level, L = VSS level
H
L
L
L
L
H
9th tune
H
L
L
H
L
H
10th tune
H
L
H
L
L
H
11th tune
H
L
H
H
L
H
12th tune
H
H
L
L
L
H
13th tune
H
H
L
H
L
H
14th tune
H
H
H
L
L
H
15th tune
H
H
H
H
L
H
16th tune
B 3
B 2
B 1
B 0
S T
Music selection
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