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
NIPPON PRECISION CIRCUITS—1
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
NIPPON PRECISION CIRCUITS—2
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.
NIPPON PRECISION CIRCUITS—3
°
°
° 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
NIPPON PRECISION CIRCUITS—4
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
–102A
–102A
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 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
–305A
–V
DD
+ 0.3 V
SS
V
NIPPON PRECISION CIRCUITS—5
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
–305A
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 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
20k
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.
NIPPON PRECISION CIRCUITS—6
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)
NIPPON PRECISION CIRCUITS—7
S0 to S3 chattering prevention function
SM1350 series
In binary select mode, S0 to S3 are sampled in sync with the 15.26 Hz clock during level-hold melody output. The chatter prevention function compares the data sampled 65.5 ms after a data transition on S0 to S3 with the data sampled 65.5 ms before the data transition. If the 2 data samples are the same, then the data transition is considered invalid. However, if they are the not the same indicating a true transition
15.26Hz
S0 to S3
Melody Output
#N #N
65.5 ms
#N
65.5 ms
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.
Figure 3. S0 to S3 chattering prevention timing
has occurred, melody output stops and only restarts again after 2 consecutive identical melody select data samples occur.
Note that except for the “Select change retrigger [No]” master slice option and binary select mode with level hold output, the S0 to S3 chattering prevention circuit is disabled.
65.5 ms
#M
#M
65.5 ms
65.5 ms
65.5 ms
#S
#S
Initialization
When power on and ICN goes LOW, all pins and internal states are initialized to the states shown below. ICN initialization has priority over all other inputs.
Output pins
• SP, SPN Open
• MSB, MSBN V
•CT V
• BUSYN V
Serial melody counter
Reset to first melody (S0 to S3 all 1)
Oscillator circuit
Stopped
DD SS DD
NIPPON PRECISION CIRCUITS—8
Melody Output Circuit
SM1350 series
The volume control circuit comprises a P-channel current-summing D/A converter, a built-in constant­current source and an external variable resistor. The circuit is set for either BTL output or A-class output by master-slice option.
VDD
MSB
MSBN
SP
VSS VOL
SPN
BTLoutput
The BTL output comprises a pair of 9-bit D/A converters and 4 external transistors (2 × NPN + 2 × PNP) to drive a speaker.
VDD
C
SPEAKER
Figure 4. BTL output circuit
A-class output circuit
The A-class output circuit comprises a single 10-bit D/A converter with current output on SP. The D/A converter MSB is set ON immediately after the oscillator starts, and the current output that results is the center point above and below which the converter current output varies in response to the waveform
VDD
BUSYN
VSS VOL
SP
VSS
amplitude. The SP output is current-to-voltage converted for connection to audio equipment or amplifiers. In A-class output mode, the 4 sound generator waveforms are time multiplexed, so an integrating circuit must be connected between SP and the amplifier to recover the signal.
VDD
AMP
SPEAKER
VSS
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics.
Figure 5. A-class output circuit
NIPPON PRECISION CIRCUITS—9
SM1350 series
Pin Functions
Binary select mode (MODE = LOW)
A melody (1 to 16) is selected according to the condition (H or L) of each 4 terminals (S0 to S3).
S3 S2 S1 S0 ST Melody S3 S2 S1 S0 ST Melody
H H H H 1st melody L H H H 9th melody H H H L 2nd melody L H H L 10th melody H H L H 3rd melody LHLH 11th melody H H L L 4th melody L H L L 12th melody H L H H 5th melody L L H H 13th melody H L H L 6th melody L L H L 14th melody H L L H 7th melody L L L H 15th melody H L L L 8th melody LLLL 16th melody
H : V
DD
level, L : V
Note:Don’t select any address with no melody recorded.
One-shot melody output (LH = LOW)
STN
SS
level
S0 to S3
Melody Output
#N
#N
#M
#M
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 6. One-shot mode (binary select)
NIPPON PRECISION CIRCUITS—10
Level hold melody output (LH = HIGH)
STN
SM1350 series
S0 to S3
Melody Output
#N
#N #N
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 7. Level hold mode (binary select) with “Select change retrigger [No]” mask option
If the “Select change retrigger [Yes]” mask option is selected, a new melody starts playing from the
STN
S0 to S3
Melody Output
#N
#N
leading note when any of the S0 to S3 inputs changes state.
#M
#M
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 8. Level hold mode (binary select) with “Select change retrigger [Yes]” mask option
Serial select mode (MODE = HIGH)
In serial select mode, the next melody is selected by cycling through the melodies in the order #N #N+1 #N1 #N when the STN input goes
master-slice option. Note that when melody output is stopped using the STOP input, the melody-select counter increments.
LOW. The number of melodies in the cycle is set by
One-shot melody output (LH = LOW)
STN
Melody Output
#N #N+1 #N+2
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 9. One-shot mode (serial select)
NIPPON PRECISION CIRCUITS—11
Level hold melody output (LH = HIGH)
STN
SM1350 series
Melody Output
#N #N+1
#N+1
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 10. Level hold mode (serial select)
S0, S1 melody output control
The melody selection in serial mode is controlled by S0 and S1 as shown in the following table. When S1 is HIGH, S0 switches to a pull-up input configuration. The states of S0 and S1 are read in immediately after start­up and does not change during melody output.
Table 1. S0, S1 resistor and melody counter
S0 S1 Melody counter
LOW × Increments when melody output stops HIGH LOW No increment HIGH HIGH Increments when melody output starts
STN
S1
S0
Serection Counter
Melody Output
#N #N+1 #N+2 #N+2
#N #N+1 #N+2#N+2
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 11. S0, S1 melody output control timing
NIPPON PRECISION CIRCUITS—12
One-shot mode repeat function
SM1350 series
In one-shot melody mode, the output repeats the same melody while STN is LOW. When STN goes
STN
Melody Output
#N #N#N
HIGH, the output continues until the end of the currently playing melody and then stops.
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 12. One-shot melody repeat timing
One-shot mode perpetual repeat function
If the score ROM end code is set to the jump code, the melody will continue to play continuously once one-shot mode starts.
STOP pin
One-shot output mode stops when STOP goes from HIGH to LOW. The STOP input is ignored in level
mode when STN is LOW. Note that even when STOP is LOW, STN has higher priority.
hold output mode and is also ignored in one-shot
CT pin
A pulse in sync with selected notes or rests is output on CT. There are 2 modes for the output pulses— pulse mode and hold mode.
Pulse mode
jq q q .jq qjq
CT DATA
CT
Hold mode
In hold mode, the output pulse inverts when a note or rest occurs for which the corresponding CT data in score ROM is set to 1. The output goes LOW after
CT DATA
CT
1 01110
16.4msec
Figure 13. CT pulse mode output
qq .
1
e
e
0
1
In pulse mode, a 16.4 ms pulse is output when a note or rest occurs for which the corresponding CT data in score ROM is set to 1.
the start of a melody and when jumping to the leading note of a melody.
qe
1
0
1
Figure 14. CT hold mode output
NIPPON PRECISION CIRCUITS—13
Fast Damping
SM1350 series
When melody output stops, the D/A converter output amplitude does not fall to zero instantaneously, instead the output converges to zero within a maxi-
Also, when one-shot melody output mode is retrig­gered, melody output restarts after the fast damping interval.
mum of 8.2 ms to prevent noise being generated.
STOP
Melody Output
8.2msec(max)
Note: Refer to the "TIMING DIAGRAMS" section to confirm melody timing specifics
Figure 15. Fast damping timing
NIPPON PRECISION CIRCUITS—14
SM1350 series
Sound Generator
Synthesis mthod
The sound generators use the dual wave synthesis (DWS) method. The DWS method uses the envelope of 2 waveforms (main waveform and sub waveform) to synthesize the generated tone. Using this method makes possible high tone quality output that faithfully reproduces the tones of real musical instruments.
Main Wave
Envelope
Generated Sound
Synthesize
Sub Wave
Number of simultaneous sounds
The maximum number of tones that can be generated simultaneously is 4, making 4-part harmony
harmony
Generation possible (where each tone is derived from corresponding main and sub waveforms).
Sound range
The range of sounds covers 5 octaves from note G2 to F#7.
Waveform ROM
Waveforms are stored in a 10-bit × 128-word × 8-waveform capacity waveform ROM.
Number of programmable tones
Envelope
Figure 16.
The maximum number of programmable tones is 16. Note that 2 similar tones which have different envelope settings are considered to be separate tones.
Built-in ROMs
The built-in ROMs comprise 3 types of ROM—waveform ROM containing waveform data, score ROM containing musical score data, and parameter ROM containing envelope and jump data.
NIPPON PRECISION CIRCUITS—15
SM1350 series
Melodies
Number of melodies
The maximum number of program melodies is 16. Note that is the jump function is used to change the tone or tempo during melody output, then the maximum number of melodies reduces by the number of times the jump function was invoked.
Number of program steps
The maximum number of program steps that can be stored in score ROM (notes, rests, jump codes and end codes) is 1024.
Tempo
The basic quarter note tempo can be set in the range 4.8 to 605.6 in multiples of 4.8.
Note (rest) rhythm values
There are 12 note rhythm values and 13 rest rhythm values that can be used to construct a melody. Also, 2 or more notes can be combined using ties or slurs.
Table 2. Rhythm values Symbol Note Rest
0123456789ABC
Symbol
Note -
Rest
3¨3
3
x
Å
3
e
x
3
ä
Å
3
q
e
ä
3
Î
e. q
äÎ
3
h
q.hh.w
3
·
Î î î. î
NIPPON PRECISION CIRCUITS—16
SM1350 series
TIMING DIAGRAMS(Refer to AC CHARACTERISTICS)
One-shot Melody Mode
tICW
ICN
MODE
S0 to S3
BUSYN
MELODY
OUTPUT
STN
STOP
MODE
LH
STN
OSC
LH
tSTW
tXST
tCH1
tDAST
Figure 17. One-shot mode (standby to melody start)
t
STW
tSTPW
tMR
tCH2
tSR
tMR
tSR
#N
tBYST
tPYST
#N
S0 to S3
Melody Output
BUSYN
ENDN
OSC
#M
#N
tPYST
tCH2
#N
tBYEN
tEDW
tEDST
Figure 18. One-shot mode (retrigger to melody stop)
NIPPON PRECISION CIRCUITS—17
tDEAN
tXEN
SM1350 series
Level Hold Melody Mode 1 (master slice option: “Change select retrigger [Yes]”)
t
ICW
ICN
STN
t
XST
OSC
t
MR
t
MODE
CH1
LH
t
SR
S0 to S3
BUSYN
Melody Output
STN
S0 to S3
Melody Output
BUSYN
#M
#M
t
BYST
t
DAST
Figure 19. Level hold mode (standby to melody start)
#N
t
#N
CH2
t
BYEN
t
CH3
t
PYST
t
DAEN
#N
#N
ENDN
OSC
t
EDW
t
EDST
Figure 20. Level hold mode (retrigger to melody stop)
NIPPON PRECISION CIRCUITS—18
t
XEN
SM1350 series
Level Hold Melody Mode 2 (master slice option: “Change select retrigger [No]”)
tICW
ICN
STN
tXST
OSC
MODE
S0 to S3
BUSYN
Melody Output
STN
S0 to S3
Melody Output
BUSYN
ENDN
LH
Figure 21. Level hold mode (standby to melody start)
#N #N
tEDW
tCH2
tCH1
tDAST
tMR
tSR
#N
tBYST
tPYST
#N
tDAEN
tBYEN
tEDW
tEDST
OSC
tXEN
Figure 22. Level hold mode (repeating melody to melody stop)
NIPPON PRECISION CIRCUITS—19
MEASUREMENT CIRCUIT
SM1350 series
C
G
C
D
VDD
S0
S1
S2
S3
MODE
LH
STOP
STN
BUSYN
CT
ICN
XT
XTN
TO
T3N
T2N
T1N
NSBN
MSB
SPN
VOL
VSS
SP
4MHz
4.7 to 10 µF
(Nonpolarity)
0.1µF
Note that circuit constants are reference values.
Parameter Pin name Measurement state
1 Melody output circuit BTL 2 STN Pull-up 3 STOP Pull-up 4 ICN Pull-up 5 LH Pull-up 6 MODE Pull-up 7 S0 to S3 Pull-up
200K
NIPPON PRECISION CIRCUITS—20
SM1350 series
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warr anty that such applications will be suitab le for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies.
NIPPON PRECISION CIRCUITS INC. 4-3, 2-chome Fukuzumi
Koto-ku, Tokyo 135-8430, Japan
NIPPON PRECISION CIRCUITS INC.
Telephone: 03-3642-6661 Facsimile: 03-3642-6698
NC9611BE 1998.10
NIPPON PRECISION CIRCUITS—21
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