SM1124 Datasheet, PDF (2/10 Pages) Nippon Precision Circuits Inc – Multimelody IC for Pagers

BLOCK DIAGRAM
SM1124 Series
CLK*
SI*
SC*
ST*
Gate
1/2 or 1/4
Divider
1/128
Control
Circuit
SW
Scale
Counter
Scale
ROM
Main
ROM
Tempo
Latch
Tempo
Counter
Rhythm
Counter
Multi-
plexer
Address
Counter
Start
Address
Latch
*: Built-in Schmmit-Triger Circuit.
VSS
VDD
MTO
TEST
PIN DESCRIPTION
Number
1
2
3
4
5
6
7
8
Name
CLK
SI
SC
ST
TEST
MTO
VDD
VSS
I/O
Function
I External reference clock input (Schmitt-trigger circuit and gate circuit built-in)
I Playback control serial interface data input pin¹
I Playback control serial interface clock input pin¹
I Playback start/stop control signal input pin¹
I Test input pin. Leave open or tie to VSS. (Pull-down resistance built-in)
O Playback signal output pin
– Supply pin (+)
– Ground pin
1. Pins SI, SC and ST have a built-in Schmitt-trigger circuit.
SPECIFICATIONS
Absolute Maximum Ratings
Parameter
Supply voltage range
Input voltage range
Power dissipation
Storage temperature range
Soldering temperature
Soldering time
Symbol
V_DD
V _IN
P_D
T _stg
T _sld
t_sld
Condition
Rating
Unit
−0.3 to 5.0
V
V_SS − 0.2 to V_DD + 0.2
V
150
mW
−40 to 125
°C
255
°C
10
s
NIPPON PRECISION CIRCUITS—2