NPC SM1124 Datasheet
SM1124 Series
NIPPON PRECISION CIRCUITS INC.
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
■
Maximum of 16 tune selections (with up to 512
steps)
■
Level hold playback mode
■
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
■
2-pin serial data tune selection
■
Power save function
■
External clock gating in non-play mode.
■
2.4 to 3.6 V supply voltage
■
8-pin plastic SOP package
■
Molybdenum-gate CMOS process
Multimelody IC for Pagers
PINOUT
8-pin SOP
SI
SC
ST
0.4 0.1
1.27
1
4
4.4 0.2
6.2 0.3
1.5 0.1
0.05 0.05
124
CLK
PACKAGE DIMENSIONS
Unit: mm
5.2 0.3
0.695TYP
8
VSS
VDD
MTO
5
TEST
+ 0.10
0.15
− 0.05
010
0.4 0.2
NIPPON PRECISION CIRCUITS—1
−
−
−
°
°
BLOCK DIAGRAM
SM1124 Series
CLK*
SI*
SC*
ST*
PIN DESCRIPTION
Gate
1/2 or 1/4 SW
Divider
1/128
Control
Circuit
Tempo
Latch
Tempo
Counter
*: Built-in Schmmit-Triger Circuit.
Rhythm
Counter
Scale
Counter
Scale
ROM
Main
ROM
Multi-
plexer
Address
Counter
Start
Address
Latch
VSS
VDD
MTO
TEST
Number Name 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
3 SC I Playback control serial interface clock input pin
4 ST I Playback start/stop control signal input pin
1
1
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
1. Pins SI, SC and ST have a built-in Schmitt-trigger circuit.
SPECIFICATIONS
Absolute Maximum Ratings
Parameter Symbol Condition Rating Unit
Supply voltage range V
Input voltage range V
Power dissipation P
Storage temperature range T
Soldering temperature T
Soldering time t
DD
IN
D
stg
sld
sld
V
0.3 to 5.0 V
SS
0.2 to V
+ 0.2 V
DD
150 mW
40 to 125
255
10 s
C
C
NIPPON PRECISION CIRCUITS—2
−
° C
−
Recommended Operating Conditions
V
= 0 V unless otherwise specified
SS
−
SM1124 Series
Parameter Symbol Condition
Supply voltage V
Operating temperature T
DC Characteristics
T
= − 20 to 70 ° C, V
a
Parameter Symbol Condition
Supply voltage V
Current consumption (1) I
Current consumption (2) I
Input voltage
Hysteresis width V
Input current
Open voltage V
Output voltage
= 0 V, V
SS
DD
min typ max
DD
opr
2.4 – 3.6 V
20 – 70
= 2.4 to 3.6 V unless otherwise specified
min typ max
2.4 3.0 3.6 V
– 25 200 µA
V
0.2 – V
DD
V
SS
0.2 1.0 – V
– – 0.5 µA
– – 0.5 µA
– – 200 µA
0.4 – V
DD
SS
V
V
V
DD
DD1
DD2
V
I
IH1
I
IL1
I
IH2
OPN
OH
OL
Non-playback mode, 25 ° C – – 0.5 µA
Playback mode, MTO pin
open
IH
IL
T
ST, SI, SC and CLK pins
ST, SI, SC and CLK pins,
V
= V
, 25 ° C
IH
DD
ST, SI, SC and CLK pins,
V
= 0 V, 25 ° C
IL
TEST pin, V
= V
IH
DD
TEST pin – – 0.1 V
MTO pin, I
MTO pin, I
= 1 mA V
OH
= 1 mA V
OL
Rating
Rating
–V
–V
SS
SS
Unit
Unit
DD
+ 0.2 V
DD
+ 0.4 V
V
V
AC Characteristics
T
= − 20 to 70 ° C, V
a
Parameter Symbol Condition
CLK pulse cycle t
CLK HIGH-level pulsewidth t
CLK LOW-level pulsewidth t
SC pulsewidth t
SC HIGH-level pulsewidth t
SC L OW-level pulsewidth t
SI-SC setup time t
SI-SC hold time t
= 0 V, V
SS
DD
= 2.4 to 3.6 V unless otherwise specified
min typ max
CLK
CWH
CWL
SC
SWH
SWL
DS
DH
“CLK input clock” timing
“SC input clock” timing
“Serial input” timing
5.0 – – µs
2.0 – – µs
2.0 – – µs
5.0 – – µs
2.0 – – µs
2.0 – – µs
2.0 – – µs
2.0 – – µs
Rating
Unit
NIPPON PRECISION CIRCUITS—3
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