NPC SM1126 Datasheet

SM1126 Series

NIPPON PRECISION CIRCUITS INC.

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

■

2.0 to 3.6 V supply voltage

■

Maximum of 16 melody selections (15 in ROM +
1 in SRAM)

■

Level hold playback mode

■

External reference clock input versions and built­in RC oscillator versions available, set by master­slice option (RC oscillator versions require an
external resistor and capacitor).

■

Selectable clock frequencies (fixed for all melo­dies)

• 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

■

2-pin serial data melody selection and 1-pin mel­ody playback control

■

Parity check function

■

Delivery pattern alarm

■

Power save function

• External clock input versions
Clock gating in non-play modes

• Built-in RC oscillator versions
Oscillator stopped in non-play modes

Melody IC with Built-in SRAM

PINOUT

(T op V iew)

8-pin VSOP

OSC

SIO

SC
ST

PACKAGE DIMENSIONS

(Unit: mm)

0.575 TYP

1
2
3
4

3.1 0.3

1126××

4.4 0.2

1.15 0.05

8
7
6
5

6.4 0.3

0.15

+ 0.1

− 0.05

VSS
VDD
MTO
TEST

0.5 0.2

ORDERING INFORMATION

De vice Pack ag e

SM1126 ×× V 8-pin VSOP

0.65

0.10

0.22 0.1

0.1 0.05

0.12

+

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M

BLOCK DIAGRAM

OSC

OSC

SM1126 Series

Frequency

Master slice Master slice

SW1

Multiplier

SW2

VSS

SIO

SC

ST

Gate

Divider

Control

Circuit

Tempo Latch

Tempo Counter

Rhythm
Counter

Divider

Main
RAM

Scale

Counter

Scale

ROM

Main

ROM

Multi­Plexer

Address

Counter

Start

Address

Latch

VDD

MTO

TEST

(Pull-down resistance
built-in)

PIN DESCRIPTION

Number Name Function

1 OSC

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

4ST

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

Built-in RC oscillator option: External resistor and capacitor connection pins
External clock input option: External reference clock input (gate circuit b uilt-in)

Play mode: Playback start/stop control signal input
Write mode: Serial interface data write control signal input

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−

−

−

−

°

°

−

° C

−

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

Recommended Operating Conditions

V

= 0 V

SS

Parameter Symbol Condition Rating Unit

Supply voltage V
Operating temperature T

DD

V

SS
IN
D

stg
sld

sld

DD

opr

−

SM1126 Series

−

∆

0.3 to 5.0 V

V

SS

0.2 to V

+ 0.2 V

DD

100 mW

40 to 125

255

C
C

10 s

2.0 to 3.6 V
20 to 70

DC Characteristics

T

= − 20 to 70 ° C, V

a

Parameter Symbol Condition

Supply voltage V
Current consumption (1) I

Current consumption (2) I

Current consumption (3) I

Input voltage

Input current (1)

Input current (2) I
Start voltage V

Output voltage (1)

Output voltage (2)

Oscillator frequency f

Frequency stability
Oscillator start voltage V
Oscillator stop voltage V

= 0 V, V

SS

DD

DD1

DD2

DD3

V
V

I

IH1

IH

IL

= 2.0 to 3.6 V

DD

Non-playback mode, T
External clock input option: Playback mode,

MTO pin open
Built-in RC oscillator option: Playback mode,

MTO pin open
External clock input option: ST, SIO, SC and

OSC pins, Built-in RC oscillator option: ST ,
SIO and SC pins

V

= V

IH

DD

External clock input option: ST, SIO, SC and
OSC pins, Built-in RC oscillator option: ST ,
SIO and SC pins

V

= 0 V , T

IL

External clock input option: ST, SIO, SC and

I

IL1

OSC pins, Built-in RC oscillator option: ST ,
SIO and SC pins

TEST pin, V

IH2

TEST pin – – 0.1 V

OPN

V

V

V

V

OH1
OL1
OH2
OL2

SIO pin, I
SIO pin, I
MTO pin, I
MTO pin, I
Built-in RC oscillator option: NPC test board

measurement, V

OSC

C

= 130 pF

O

f/f Built-in RC oscillator option – 0.2 – %/0.1V

Built-in RC oscillator option – – 1.6 V

DOB

Built-in RC oscillator option – – 1.6 V

DOS

= 25 ° C – – 0.5 µA

a

, T

= 25 ° C

a

= 25 ° C

a

= V

IH

DD

= 1 mA, V

OH1

= 1 mA, V

OL1

= 1 mA V

OH2

= 1 mA V

OL2

= 2.4 V V

DD

= 2.4 V V

DD

= 3.0 V, R

DD

= 82 k Ω ,

O

Rating

min typ max

2.0 3.0 3.6 V

– 25 200 µA

– 215 600 µA

V

0.2 – V

DD

V

SS

–V

DD

+ 0.2 V

SS

– – 0.5 µA

– – 0.5 µA

– – 200 µA

0.4 – V

DD

SS

0.4 – V

DD

SS

–V

–V

DD

+ 0.4 V

SS

DD

+ 0.4 V

SS

117.965 131.072 144.179 kHz

Unit

V

V

V

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AC Characteristics

T

= − 20 to 70 ° C, V

a

SS

= 0 V, V

= 2.0 to 3.6 V

DD

SM1126 Series

Parameter Symbol Condition

OSC pulse cycle t
OSC HIGH-level pulsewidth t
OSC LOW-level pulsewidth t
OSC pulse rise time t
OSC pulse fall time t
SC pulsewidth t
SC HIGH-level pulsewidth t
SC L OW-level pulsewidth t
SC pulse rise time t
SC pulse fall time t
SIO-SC setup time t
SIO-SC hold time t
ST input write pulsewidth t
ST input write pulse rise time t
ST input write pulse fall time t
SIO output enable delay t
SIO output disable delay t

OSC

OWH

OWL

Or

Of

SC

SWH

SWL

Sr

Sf

DS

DH

WP

Wr

Wf

OE

OD

“OSC input pulse (external clock
input version)” timing

“SC input pulse” timing

“SC-SIO-ST serial input pulse”
timing

“SIO parity check G-flag output
data” timing

Rating

Unit

min typ ma x

4.0 – – µs

2.0 – – µs

2.0 – – µs
– – 200 ns
– – 200 ns

4.0 – – µs

2.0 – – µs

2.0 – – µs
– – 200 ns
– – 200 ns

2.0 – – µs

2.0 – – µs

2.0 – – µs
– – 200 ns
– – 200 ns
– – 600 ns
– – 600 ns

OSC input pulse (external clock input version)

tt

OWH

t

OSC

OWL

SC input pulse

t

SWH

t

SC

t

SWL

OWL

V

0.9VDD

0.1VDD

t

Of

t

Or

0.9VDD

0.1VDD

t

Sf

t

Sr

DD

0.5VDD
V

SS

V

DD

0.5VDD
V

SS

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SC-SIO-ST serial input pulse

SC

t

DS

SIO

ST

SM1126 Series

t

DH

ST must be set to LOW when switching ST

V

DD

0.5VDD
V

SS

V

DD

0.5VDD
V

SS

t

WP

0.9VDD

0.1VDD

t

Wr

t

Wf

V

DD

0.5VDD
V

SS

SIO parity check G-flag output data

SC

SIO

ST

INPUT MODE

t

0.1VDD

OE

OUTPUT MODE (G FLAG OUTPUT) INPUT MODE

0.1VDD

ST must be set to LOW when switching ST

0.9VDD

0.9VDD

t

OD

V

DD

0.5VDD
V

SS

V

DD

0.5VDD
V

SS

V

DD

0.5VDD
V

SS

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SM1126 Series

FUNCTIONAL DESCRIPTION

Control Functions

External reference clock

SM1126 Series devices are available in external clock input versions and built-in RC oscillator versions, set
by master-slice option. In the case of the built-in RC oscillator option, an external resistor and capacitor is
required for the oscillator function.

SM1126 Series devices can operate at 6 selectable reference clock frequencies. All melodies playback at the
fixed speed set by the reference clock frequency. External clock input versions operate at one of 6 selectable
clock frequencies, as shown in table 1. Built-in RC oscillator versions operate at only one oscillator frequen­cies—131.072 kHz.

Table 1. Reference clock frequencies (external clock)

Frequency

system

32.768 kHz 32.768 kHz 65.536 kHz 131.072 kHz

38.4 kHz 38.4 kHz 76.8 kHz 153.6 kHz

Selectable frequencies

Power-save function

In external clock input versions, the external reference clock input is used during playback mode only and is
otherwise ignored. 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.

In built-in RC oscillator versions, the oscillator is stopped when not in playback mode (when ST is LOW),
preventing unwanted current flow.

ST

OSC

Figure 1. External clock input version: OSC input during playback mode only

OSC

OSC

ST

Figure 2. External clock input version: Continuous OSC input

ST

CR Oscillation

Figure 3. Built-in RC oscillator version

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