SM1126 Series
NIPPON PRECISION CIRCUITS--1
NIPPON PRECISION CIRCUITS INC.
Melody IC with Built-in SRAM
OVERVIEW
The SM1126 Series are melody ICs for use in mobile
telecommunications equipment. A maximum of 15
melodies can be stored in programmable ROM and
one in built-in read/write SRAM.
FEATURES
s
2.0 to 3.6 V supply voltage
s
Maximum of 16 melody selections (15 in ROM +
1 in SRAM)
s
Level hold playback mode
s
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).
s
Selectable clock frequencies (fixed for all melo-
dies)
External clock input versions (6 frequencies)
- 32.768 kHz system: 32.768, 65.536 and
131.072 kHz
- 38.4 kHz system: 38.4, 76.8 and 153.6 kHz
Built-in RC oscillator versions (1 frequency)
- 131.072 kHz
s
2-pin serial data melody selection and 1-pin mel-
ody playback control
s
Parity check function
s
Delivery pattern alarm
s
Power save function
External clock input versions
Clock gating in non-play modes
Built-in RC oscillator versions
Oscillator stopped in non-play modes
ORDERING INFORMATION
PINOUT
(Top View)
8-pin VSOP
PACKAGE DIMENSIONS
(Unit: mm)
D e vice
P a ck ag e
SM1126
V
8-pin VSOP
OSC
SIO
SC
ST
VSS
VDD
MTO
TEST
1
4
5
6
1126
2
3
7
8
4.4 0.2
6.4 0.3
3.1 0.3
0.65
0.22 0.1
1.15 0.05
0.5 0.2
0.575 TYP
0.15
+
0.1
-
0.05
0.12
+
M
0.10
0.1 0.05
SM1126 Series
NIPPON PRECISION CIRCUITS--2
BLOCK DIAGRAM
PIN DESCRIPTION
N u m b e r
N a m e
Function
1
OSC
Built-in RC oscillator option: External resistor and capacitor connection pins
External clock input option: External reference clock input (gate circuit built-in)
2
SIO
Playback control serial interface data input. During parity check, the G flag is output while ST is HIGH.
3
SC
Playback control serial interface clock input
4
ST
Play mode: Playback start/stop control signal input
Write mode: Serial interface data write control signal input
5
TEST
Test input. Pull-down resistor built-in. Leave open or connect to VSS.
6
MTO
Playback melody signal output
7
VDD
Supply
8
VSS
Ground
Gate
Frequency
Multiplier
SW2
Divider
Scale
Counter
Scale
ROM
Tempo Latch
Tempo Counter
Rhythm
Counter
Address
Counter
Start
Address
Latch
Main
ROM
Control
Circuit
OSC
SIO
SC
ST
VSS
VDD
MTO
TEST
Multi-
Plexer
OSC
SW1
Divider
Main
RAM
Master slice
Master slice
(Pull-down resistance
built-in)
SM1126 Series
NIPPON PRECISION CIRCUITS--3
SPECIFICATIONS
Absolute Maximum Ratings
Recommended Operating Conditions
V
SS
= 0 V
DC Characteristics
T
a
=
-
20 to 70
C, V
SS
= 0 V, V
DD
= 2.0 to 3.6 V
P arameter
S y m b o l
Condition
Rating
Unit
Supply voltage range
V
DD
-
V
SS
-
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
100
mW
Storage temperature range
T
stg
-
40 to 125
C
Soldering temperature
T
sld
255
C
Soldering time
t
sld
10
s
P arameter
S y m b o l
Condition
Rating
Unit
Supply voltage
V
DD
2.0 to 3.6
V
Operating temperature
T
opr
-
20 to 70
C
P arameter
S y m b o l
Condition
Rating
Unit
m i n
typ
m a x
Supply voltage
V
DD
2.0
3.0
3.6
V
Current consumption (1)
I
DD1
Non-playback mode, T
a
= 25
C
0.5
A
Current consumption (2)
I
DD2
External clock input option: Playback mode,
MTO pin open
25
200
A
Current consumption (3)
I
DD3
Built-in RC oscillator option: Playback mode,
MTO pin open
215
600
A
Input voltage
V
IH
External clock input option: ST, SIO, SC and
OSC pins, Built-in RC oscillator option: ST,
SIO and SC pins
V
DD
-
0.2
V
DD
V
V
IL
V
SS
V
SS
+ 0.2
V
Input current (1)
I
IH1
V
IH
= V
DD
, T
a
= 25
C
External clock input option: ST, SIO, SC and
OSC pins, Built-in RC oscillator option: ST,
SIO and SC pins
0.5
A
I
IL1
V
IL
= 0 V, T
a
= 25
C
External clock input option: ST, SIO, SC and
OSC pins, Built-in RC oscillator option: ST,
SIO and SC pins
0.5
A
Input current (2)
I
IH2
TEST pin, V
IH
= V
DD
200
A
Start voltage
V
OPN
TEST pin
0.1
V
Output voltage (1)
V
OH1
SIO pin, I
OH1
= 1 mA, V
DD
= 2.4 V
V
DD
-
0.4
V
DD
V
V
OL1
SIO pin, I
OL1
= 1 mA, V
DD
= 2.4 V
V
SS
V
SS
+ 0.4
V
Output voltage (2)
V
OH2
MTO pin, I
OH2
= 1 mA
V
DD
-
0.4
V
DD
V
V
OL2
MTO pin, I
OL2
= 1 mA
V
SS
V
SS
+ 0.4
V
Oscillator frequency
f
OSC
Built-in RC oscillator option: NPC test board
measurement, V
DD
= 3.0 V, R
O
= 82 k
,
C
O
= 130 pF
117.965
131.072
144.179
kHz
Frequency stability
f/f
Built-in RC oscillator option
0.2
%/0.1V
Oscillator start voltage
V
DOB
Built-in RC oscillator option
1.6
V
Oscillator stop voltage
V
DOS
Built-in RC oscillator option
1.6
V
SM1126 Series
NIPPON PRECISION CIRCUITS--4
AC Characteristics
T
a
=
-
20 to 70
C, V
SS
= 0 V, V
DD
= 2.0 to 3.6 V
OSC input pulse (external clock input version)
SC input pulse
P arameter
S y m b o l
Condition
Rating
Unit
m i n
typ
m a x
OSC pulse cycle
t
OSC
"OSC input pulse (external clock
input version)" timing
4.0
s
OSC HIGH-level pulsewidth
t
OWH
2.0
s
OSC LOW-level pulsewidth
t
OWL
2.0
s
OSC pulse rise time
t
Or
200
ns
OSC pulse fall time
t
Of
200
ns
SC pulsewidth
t
SC
"SC input pulse" timing
4.0
s
SC HIGH-level pulsewidth
t
SWH
2.0
s
SC LOW-level pulsewidth
t
SWL
2.0
s
SC pulse rise time
t
Sr
200
ns
SC pulse fall time
t
Sf
200
ns
SIO-SC setup time
t
DS
"SC-SIO-ST serial input pulse"
timing
2.0
s
SIO-SC hold time
t
DH
2.0
s
ST input write pulsewidth
t
WP
2.0
s
ST input write pulse rise time
t
Wr
200
ns
ST input write pulse fall time
t
Wf
200
ns
SIO output enable delay
t
OE
"SIO parity check G-flag output
data" timing
600
ns
SIO output disable delay
t
OD
600
ns
V
DD
V
SS
0.5V
DD
t
Of
t
Or
OWH
t
t
OSC
t
0.1V
DD
0.9V
DD
OWL
V
DD
V
SS
OWL
0.5V
DD
t
Sf
t
Sr
SWH
t
SWL
t
SC
t
0.1V
DD
0.9V
DD
SM1126 Series
NIPPON PRECISION CIRCUITS--5
SC-SIO-ST serial input pulse
SIO parity check G-flag output data
ST must be set to LOW when switching ST
ST must be set to LOW when switching ST
SC
SIO
DS
t
DH
t
ST
0.9V
DD
0.1V
DD
Wr
t
WP
t
Wf
t
V
DD
V
SS
0.5V
DD
V
DD
V
SS
0.5V
DD
V
DD
V
SS
0.5V
DD
SC
SIO
ST
V
DD
V
SS
0.5V
DD
V
DD
V
SS
0.5V
DD
V
DD
V
SS
0.5V
DD
INPUT MODE
OUTPUT MODE (G FLAG OUTPUT)
INPUT MODE
OE
t
OD
t
0.9V
DD
0.1V
DD
0.1V
DD
0.9V
DD
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