NPC SM1350 Technical data

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SM1350 series

NIPPON PRECISION CIRCUITS INC.

OVERVIEW

The SM1350 series are single-chip high tone quality
melody ICs, fabricated using NPC’s Molybdenum­gate CMOS process. Melodies are selected in serial
or binary (parallel) mode, up to a maximum of 16
melody blocks. There are 4 sound generators
incorporated to produce 4 kinds of output tone
controlled by 16-tone data, making these ICs ideal
for mechanical clocks and similar applications where
high tone quality output is demanded.

FEATURES

■

Basic Functions

• 4.0 MHz oscillator frequency

• Power-save function

- Oscillator stopped when no output

- S0 to S3, MODE, LH pull-up resistors open

• BTL or A-class outputs

• Chattering prevention circuit (STN, STOP, S0
to S3)

• 10-bit D/A converter

■

Sound Generator Functions

• DWS (dual wave synthesis) sound generators

• 4 simultaneous sounds for 4 tones

• G2 to F#7 note range

• 16-tone programmable

■

Melody Functions

• Up to 16 programmable melodies (singly or in
medleys)

• 1024-step length (notes, rests, jumps, end
codes)

• Level hold/one-shot melody modes

• Serial/binary (parallel) select modes

• 4.8 to 605.6 tempo range in 127 steps

• 12 rhythm values

3

xx3ee3q . e q3hq .hh .w

• Ties and slurs programmable

■

Control Signal Outputs

• BUSYN signal LOW during melody output

• CT signal output for external control

■

2.4 to 5.5 V supply voltage

■

Package

• 24-pin SSOP (SM1350 ××× )

■

Molybdenum-gate CMOS

High Tone Quality Melody LSI

PINOUT

PACKAGE DIMENSIONS

24-pin SSOP (Unit: mm)

ORDERING INFOMATION

(TOP VIEW)

1

VDD

S0
S1
S2
S3

MODE

LH

STOP MSB

STN

BUSYN

CT

ICN VSS

10.05 0.20

10.20 0.30

0.7 0.8

SM1
350

12 13

5.40 0.20

0.36 0.10

7.80 0.30

1.80 0.10

2.10MAX

0.10 0.10

24

0.50 0.20

Device Package

SM1350 ××× M 24pin SSOP

XT
XTN
TO
T3N
T2N
T1N
MSBN

SP
SPN
VOL

0.15

0.1

+

0.05

−

010

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BLOCK DIAGRAM

SM1350 series

MODE

LH

STOP

STN

TO
T1N
T2N
T3N

XT

XTN

S3
S2
S1
S0

Input Circuit

Oscillator

Wave ROM
Arithmetic block Circuit

Parameter ROM

Control Circuit

Score ROM

+

DAC

SP
SPN

VOL

MSB
MSBN
BUSYN
CT

ICN
VDD
VSS

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PIN DESCRIPTION

SM1350 series

Number Name I/O State

1 VDD – – Supply pin
2S0ISU
3S1ISU
4S2ISU
5S3ISU
6 MODE I SU Melody select mode control. Binary mode when LOW, and serial mode when HIGH.
7 LH I SU Melody output mode control. One-shot when LOW, and level hold when HIGH.

8 STOP I U or O

9 STN I U or O Melody start control
10 BUSYN O C Busy output signal. LOW when a melody is output.
11 CT O C External control pulse output
12 ICN I U Initialization clear input
13 VSS – – Ground pin
14 VOL I – Volume adjust control. Volume adjusted using an external resistor.

15 SPN O P

16 SP O P

O C BTL output mode: Signed-bit output. HIGH when no melody is output.

17 MSB

I U A-class output mode: BUSYIN input

18 MSBN O C

19 T1N I U

21 T3N I U
22 TO O C Test signal output. 62.5 kHz output when not in test mode.
23 XTN O – Oscillator output
24 XT I – Oscillator input

1

Binary select mode: Phrase select pins.
Serial select mode: S0 and S1 control melody output.

One-shot melody mode: Melody output stop control.
Level hold melody mode: Invalid input.

9-bit D/A converter output in BTL output mode.
VOL current output in A-class output mode.

BTL output mode: 9-bit D/A converter output.
A-class output mode: 10-bit D/A converter output.

BTL output mode: Signed-bit output. HIGH when no melody is output.
A-class output mode: ENDN output. HIGH when no melody is output.

Test signal inputs20 T2N I U

Description

2

1. U = pull-up resistor connection, SU : pull-up resistor connection only when melody output starts,
P = p-channel open drain, C = complementary output.
U or O = pull-up resistance or open drain (master slice)

2. BTL/A-class output mode is selected by mask option.

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−

−

−

°

°

−

° C

SPECIFICATIONS

Absolute Maximum Ratings

V

= 0 V

SS

Parameter Symbol Condition Rating Unit

Supply voltage V
Input voltage V
Storage temperature T
Power dissipation P
Soldering temperature T
Soldering time t

Recommended Operating Conditions

V

= 0 V

SS

Parameter Symbol Condition

Supply voltage V
Operating temperature T

DD

IN

stg

D

sld

sld

DD

opr

SM1350 series

0.3 to 7.0 V

V

0.3 to V

SS

min typ max

2.4 – 5.5 V
20 – 80

+ 0.3 V

DD

40 to 125

650 mW
255

10 s

Rating

C

C

Unit

Master slice

Specifications Function Selected condition

Serial-mode melody selections 1 to 16
Melody output circuit BTL / A-class
Level-hold melody select change retrigger Yes / No

Pull-up/pull-down resistance

STN U

STOP U / O

Underlined entries are the default standard options. Throughout this datasheet, the standard options are
assumed unless otherwise specified.
U: pull-up resistance O: open input

/ O

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DC Characteristics

V

= 3 V, T

DD

Minimum operating supply voltage
Maximum operating supply voltage
Standby current consumption I

Operating current consumption I

XT external capacitance C
XTN external capacitance C
Clock frequency
Clock duty cycle
S0 to S3, MODE, LH, STOP, STN, ICN

HIGH-level input voltage
S0 to S3, MODE, LH, STOP, STN, ICN

LOW-level input voltage
S0 to S3, MODE, LH, STOP, STN, ICN

HIGH-level input current
S0 to S3, MODE, LH, STOP, STN, ICN

LOW-level input current
BUSYN, CT, TO HIGH-level output

current
BUSYN, CT , TO LOW-lev el output current I
MSB , MSBN HIGH-level output current I
MSB, MSBN LOW -level output current I
SP, SPN output current

= 25 ° C, V

a

= 0 V, f

SS

Parameter Symbol Condition

1

1

2

2

3

= 4.0 MHz

O

V

MIN

V

MAX

STBY

DD

G

D

f

XTI

R

XTI

V

IH

V

IL

I

IH

I

IL

I

OH1

OL1

OH2

OL2

I

OH3

−

−

−

−

SM1350 series

Rating

min typ max

– – 2.4 V

5.5 – – V

No melody output – – 1.0 µA
BUSYN, CT, TO, SP, SPN,

MSB, MSBN all open

V

= V

IH

DD

V

= V

IL

SS

V

= V

OH1

V

OL1

V

OH2

V

OL2

V

OH3

0.7 2.0 – – mA

DD

= V

+ 0.7 2.0 – – mA

SS

= V

0.7 3.0 – – mA

DD

= V

+ 0.7 3.0 – – mA

SS

= V

+ 0.7 – – 4.0 mA

SS

– – 3.5 mA

–30–pF
–30–pF

3.8 4.0 4.2 MHz

40 50 60 %

V

0.3 – V

DD

V

SS

–V

DD

+ 0.3 V

SS

–1020µA

–1020µA

Unit

V

1.Supply voltage ratings shown are with oscillator running and all functions operating normally.

2.Clock frequency and duty cycle are ratings for the clock input on pin XT.

3.Output current when 20 k Ω volume control resistor is connected to VOL, and all D/A con verter bits ON, measured using the circuit of the next page.

V

= 5 V, T

DD

= 25 ° C, V

a

= 0 V, f

SS

= 4.0 MHz

O

Rating

Parameter Symbol Condition

Unit

min typ max

Minimum operating supply voltage
Maximum operating supply voltage
Standby current consumption I

Operating current consumption I

XT external capacitance C
XTN external capacitance C
Clock frequency
Clock duty cycle

2

2

S0 to S3, MODE, LH, STOP, STN, ICN
HIGH-level input voltage

S0 to S3, MODE, LH, STOP, STN, ICN
LOW-level input voltage

S0 to S3, MODE, LH, STOP, STN, ICN
HIGH-level input current

1

1

V

V

MAX

STBY

DD

f

XTI

R

V

V

I

MIN

XTI

IH

IL

IH

– – 2.4 V

5.5 – – V

No melody output – – 1.0 µA
BUSYN, CT, TO, SP, SPN,

MSB, MSBN all open

G

D

– – 9.5 mA

–30–pF
–30–pF

3.8 4.0 4.2 MHz

40 50 60 %

V

0.3 – V

DD

V

SS

V

= V

IH

DD

–3050µA

–V

DD

+ 0.3 V

SS

V

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SM1350 series

−

−

Parameter Symbol Condition

Rating

min typ max

S0 to S3, MODE, LH, STOP, STN, ICN
LOW-level input current

BUSYN, CT, TO HIGH-level output
current

BUSYN, CT , TO LOW-lev el output current I
MSB , MSBN HIGH-level output current I
MSB, MSBN LOW -level output current I
SP, SPN output current

3

I

OH1

OL1

OH2

OL2

I

OH3

I

IL

V

= V

IL

SS

V

= V

OH1

V

OL1

V

OH2

V

OL2

V

OH3

0.7 2.0 – – mA

DD

= V

+ 0.7 2.0 – – mA

SS

= V

0.7 3.0 – – mA

DD

= V

+ 0.7 3.0 – – mA

SS

= V

+ 0.7 – – 7.7 mA

SS

–3050µA

1. Supply voltage ratings shown are with oscillator running and all functions operating normally.

2. Clock frequency and duty cycle are ratings for the clock input on pin XT.

3. Output current when 20 k Ω volume control resistor is connected to VOL, and all D/A con verter bits ON, measured using the following circuit.

VDD

SP,SPN

V

DD

VOL

VSS

A

0.7V

20kΩ

Unit

AC Characteristics

V

= 3 or 5 V, T

DD

Initialization clear time t
STN pulsewidth t
Oscillator start-up time
Oscillator stop time t
D/A converter rise delay time t
D/A converter fall delay time t
STN, STOP standby chattering time t
STN, STOP oscillator chattering time t
S0 to S3 melody select chattering time t
MODE, LH read timing t
S0 to S3 read timing t
BUSYN fall delay time t
BUSYN rise delay time
Melody start delay time t
STOP pulsewidth t
ENDN delay time t
ENDN pulsewidth t

= 25 ° C, V

a

SS

= 0 V

Parameter Symbol Condition

1

2

ICW

STW

t

XST

XEN

DAST

DAEN

CH1

CH2

CH3

MR

SR

BYST

t

BYEN

PYST

STPW1

EDST

EDW

Rating

Unit

min typ max

1.0 – – µsec

Pre-input option selected 81.9 – – msec

– – 500 µsec

180.2 – 196.7 msec
– 81.9 – msec

180.2 – 196.7 msec
– 81.9 – msec

Oscillator running 65.5 – 82.0 msec

65.5 – 131.1 msec
– 15.9 – µsec
– 31.9 – µsec
– 8.2 – msec
– – 8.2 msec
– 16.4 – msec

Pre-input option selected 81.9 – – msec
A-class output option – – 8.2 msec
A-class output option – 16.0 – µsec

1.Oscillator start - up time = [time from when STN goes LOW to when TO goes HIGH] - 25.0 µ s .

2.The time taken for fast damping to reduce the envelope to 0 level.

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FUNCTIONAL DESCRIPTION

Chattering Prevention

STN, STOP chattering prevention function

Standby Mode

SM1350 series

The oscillator starts when STN goes from HIGH to
LOW in standby mode. Input data is received and

Internal

Clock

81.9ms 81.9ms

STN

OSC

Input

Reception

Melody
Output

melody data output starts 81.9 ms after the oscillator
starts if STN is LOW.

Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.

Figure 1. STN, STOP chattering prevention timing (standby mode)

Oscillator starts running

After the oscillator starts running, input data is
considered valid 81.9 ms after STN and STOP have

Internal

Clock

STN or

STOP

Input

Reception

last changed state. Input data is considered invalid
for intervals less than 65.5 ms.

81.9ms65.5ms

Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.

Figure 2. STN, STOP chattering prevention timing ( oscillator running)

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