Datasheets SM5128A1 Datasheet

DISCONTINUED

PRODUCT

SM5128A1

NIPPON PRECISION CIRCUITS INC.

OVERVIEW

The SM5128A1 is a CB transceiver system CMOS
IC that incorporates a PLL synthesizer, USA-fre­quency specification code ROM, channel up/down
control circuit, LCD driver and channel-change
unlock signal generator. All these features in a single
chip allow the overall system cost to be reduced.

FEATURES

USA-specification code ROM

■

Channel up/down control circuit

■

Unlock signal generator circuit

■

Channel/PA display decoder

■

LCD driver

■

Channel-change confirmation tone output signal

■

Amplifier for an active low-pass filter

■

Single-crystal PLL synthesizer

■

4.5 to 5.5 V supply voltage

■

10.24 MHz crystal oscillator circuit

■

28-pin shrink DIP (SM5128A1N)

■

28-pin VSOP(SM5128A1V)

■

Molybdenum-gate CMOS process

■

PINOUT

Top View

1COMC

2S1

3S2

4S3

SM5128A1

5S4

6S5

7S6

8HL

9LB

10PA

11TEST

12XOUT

13XIN

14VSS 15 FIN

28 COMB

27 COMA

26 UP

25 DN

24 EMG

23 TR

22 CE

21 CHO

20 LD

19 AO

18 AI

17 DO

16 VDD

CB Transceiver System LSI

PACKAGE DIMENSIONS

Unit: mm

28-pin Shrink DIP

9.10 0.25

+ 0.20

26.00

− 0.30

+ 0.50

1.00

− 0

1.778MAX

28-pin VSOP

0.675 TYP
+

9.8 0.2

-

0.65

ORDERING INFOMATION

Device Package

SM5128A1N 28pin SDIP

1.778 0.18

0.45 0.10

+

-

0.22

0.1

0.05

0.51MIN

4.85MAX

0.2

0.2

-

-

+

+

5.6

7.6

-

+

-

+

1.15 0.1

0.10 0.05

3.00MIN

+

0.5 0.2

-

10.16TYP

0

0.25 0.05

10

015

0.1

+

0.05

-

0.15

SM5128A1V 28pin VSOP

NIPPON PRECISION CIRCUITS—1

BLOCK DIAGRAM

COMA

COMB

COMC

S1

S2

S3

S4

S5

S6

LB

HL

FIN

XIN

LCD
COM

LCD

DRIVER

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SM5128A1

PRODUCT

SW2

LCD DRIVING
SIGNAL
GENERATOR

UP/DN COUNTER

MULTI PLEXER

CHANNEL ROM

PROGRAMMABLE

DIVIDER

SW1

REFERENCE

DIVIDER

CONTROLLER

LD CONTROLLER

AMP

PHASE DETECTOR

TEST

CE

PA

UP

DN

EMG

TR

CHO

LD

AI

AO

DO

VDD

XOUT

PIN DESCRIPTION

Number Name Description

1 COMC LCD common drive signal output

2 to 7 S1 to S6 LCD segment drive signal output

8HL

9LB“LOW BATTERY” display indicator input. “LOW BATTERY” indicator when LOW or open. Pull-down resistor built-in.

10 PA PA input. PA mode when HIGH. Pull-down resistor built-in.

11 TEST Test input. Tie LOW or open for normal operation.

12 XOUT

13 XIN

14 VSS Ground

15 FIN Programmable counter input. Feedback resistor built-in.

16 VDD 4.5 to 5.5 V supply voltage

17 DO Phase detector output. Three-state output pin.

18 AI

19 AO

20 LD Unlock signal output. Unlocked when LOW, and locked when HIGH.

21 CHO Channel-change confirmation tone output. Active-HIGH pulse of approximately 50 ms duration.

“HIGH POWER”/”LOW POWER” display indicator control input. “HIGH POWER” indicator when HIGH, and “LOW
POWER” indicator when LOW or open. Pull-down resistor built-in.

Crystal oscillator circuit input and output

Inverter input and output. AI is HIGH in standby mode.

VSS

NIPPON PRECISION CIRCUITS—2

−

−

°

−

°

°

−

−

−

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SM5128A1

PRODUCT

Number Name Description

22 CE PLL start pin. Start when HIGH, and standby mode when LOW. Pull-down resistor built-in.

23 TR Transmit/Receive switch input. Transmit when HIGH, and receive when LOW or open. Pull-down resistor built-in.

24 EMG

25 UP Channel-change up control input. Change up when HIGH. Pull-down resistor built-in.

26 DN Channel-change down control input. Change down when HIGH. Pull-down resistor built-in.

27 COMA

28 COMB

SPECIFICATIONS

Absolute Maximum Ratings

V

= 0 V

SS

Parameter Symbol Condition Rating Unit

Supply voltage V

Input voltage range V

Power dissipation P

Operating temperature T

Storage temperature range T

Soldering temperature T

Soldering time t

Output current I

Emergency channel select input. Channel 9 when HIGH, and the previously set channel with channel up/down
control when LOW or open. Pull-down resistor built-in.

LCD common drive signal outputs

DD

IN

D

opr

stg

sld

sld

O

0.3 to 7.0 V

V

to V

SS

DD

150 mW

30 to 80

40 to 125

255

10 s

10 mA

V

C

C

C

Recommended Operating Conditions

V

= 0 V

SS

Parameter Symbol Condition

Supply voltage V

DD

Electrical Characteristics

V

= 0 V, Ta=–30 to 80 ˚C, V

SS

Parameter Symbol Condition

Operating consumption current

1

FIN maximum operating frequency f

XIN maximum operating frequency f

FIN operating input voltage V

XIN operating input voltage V

LOW-level input voltage

HIGH-level input voltage

2

2

FIN and XIN start voltage V

=4.5 to 5.5V unless otherwise noted

DD

I

DD

max1

max2

IN1

IN2

V

IL1

V

IH1

IO

1.0 Vp-p sine wave 18 ––MHz

1.0 Vp-p sine wave 12 ––MHz

18 MHz sine wave 1.0 – V

10.24 MHz sine wave 1.0 – V

V

DD

Rating

min typ max

Unit

4.5 5.0 5.5 V

Rating

min typ max

Unit

––10 mA

1Vp-p

DD

1Vp-p

DD

––0.4 V

V

0.4 ––V

DD

= 5.0 V 2.0 2.5 3.0 V

NIPPON PRECISION CIRCUITS—3

µ

µ

µ

µ

µ

µ

µ

−

−

−

−

−

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PRODUCT

Parameter Symbol Condition

FIN and XIN LOW-level input current I

FIN and XIN HIGH-level input current I

LOW-level input current

HIGH-level input current

2

2

AI LOW-level input current I

AI HIGH-level input current I

Standby current I

COMA, COMB, COMC LOW-level
output voltage

COMA, COMB, COMC HIGH-level
output voltage

S1 to S6 LOW-level output voltage V

S1 to S6 HIGH-level output voltage V

LD, CHO, DO LOW-level output
voltage

LD, CHO, DO HIGH-level output
voltage

AO LOW-level output voltage V

AO HIGH-level output voltage V

XOUT LOW-level output voltage V

XOUT HIGH-level output voltage V

DO, AI HIGH-level leakage current I

DO, AI LOW-level leakage current I

V

V

V

V

IL1

IH1

I

IL2

I

IH2

IL3

IH3

STB

OL1

OH1

OL2

OH2

OL3

OH3

OL4

OH4

OL5

OH5

LH

LL

1. FIN = 16.71 MHz and 1.0 Vp-p, XIN = 10.24 MHz and 1.0 Vp-p

2. Pins HL, LB, PA, TEST, CE, TR, EMG, DN, UP.

V

V

V

V

V
T

V
T

CE = open, T

I

OL

I

OH

I

OL

I

OH

I

OL

I

OH

I

OL

I

OH

I

OL

I

OH

V
T

V
T

SM5128A1

Rating

min typ max

= 0 V, V

IL1

= V

IH1

= 0 V, V

IL2

= V

IH2

= 0 V, V

IL3

= 25 ° C

a

= V

IH3

= 25 ° C

a

= 10 µ A ––0.4 V

= 10 µ AV

= 10 µ A ––0.4 V

= 10 µ AV

= 0.4 mA ––0.4 V

= 0.4 mA V

= 0.4 mA, AI = V

= 0.4 mA, AI = 0 V V

= 0.1 mA, XIN = V

= 0.1 mA, XIN = 0 V V

= VDD, VDD = 5.5 V,

IH4

= 25 °C

a

= 0 V, VDD = 5.5 V,

IL4

= 25 °C

a

= 5.5 V ––20

DD

, V

= 5.5 V ––20

DD

DD

= 5.5 V ––1

DD

, V

= 5.5 V – 100 200

DD

DD

= 5.5 V,

DD

, V

= 5.5 V,

DD

DD

= 25 ° C – 0.001 1

a

DD

DD

– 0.001 1

– 0.001 1

0.4 ––V

DD

0.4 ––V

DD

0.4 ––V

DD

––0.4 V

0.4 ––V

DD

––0.4 V

0.4 ––V

DD

––100 nA

––100 nA

Unit

A

A

A

A

A

A

A

NIPPON PRECISION CIRCUITS—4

TYPICAL APPLICATION

DISCONTINUED

SM5128A1

PRODUCT

VDD

LOW BATTERY

HIGH POWER

LOW POWER

RF

2

COMB

COMA

COMCS1S2

UP

1ST
MIX

MOD

DN

S3

EMG

S4

1ST

VCO

TR

S5

CE

S6

2ND

MIX

10.24MHz

LD

CHO

HL

LB

IF

2ND

IF

R3

C2

C1

R2

AI

AO

DO

PA

TEST

XOUT

VDD

VDD

R1

PIN

VDD

XIN

VSS

10.24MHz

DET

1000pF

AF

TONE OUT

Display Font

1/3 bias 1/3 duty

2ND MIX

NIPPON PRECISION CIRCUITS—5

LCD Segment Diagram



DISCONTINUED

SM5128A1

PRODUCT

S1

COMC

COMB

COMA

CommonS1S2S3S4S5S6

COMA LOW POWER 2d 2c 1e 1d –

COMB HIGH POWER 2e 2g 1f 1g 1c

COMC LOW BATTERY 2f 2a 2b 1a 1b

LOW BATTERY



HIGH POWER

LOW POWER

S2

S3 S4

2a

2f

2g

2e

2d

S5 S6

1a

2b

2e

1f

1e

1b

1g

1c

1d

FUNCTIONAL DESCRIPTION

Input Timing

The input timing for pins HL, LB, PA, TR and EMG
is shown in the following figure.

INPUT

SAMPLING CLOCK
(Internal)

INPUT CIRCUITS
OUTPUT

Note that data is read in on the falling edge of the
sampling clock.

51.2ms

NIPPON PRECISION CIRCUITS—6

Chattering Elimination Circuit

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SM5128A1

PRODUCT

A high-speed chattering elimination circuit is incor­porated in pins UP and DN. The chattering elimina­tion circuit recognizes the input state only after the

INPUT

SAMPLING CLOCK
(Internal)

Chatering circuits
OUTPUT

3.2 to 9.6ms

Note that the input is recognized during the LOW­level pulse interval, t

(32 ms), of the sampling

S

clock.

CE

CE is the chip enable pin. Normal operation is
selected when CE is HIGH, and standby mode is
selected when CE is LOW. CE incorporates a pull­down resistor.

In standby mode, the following states occur.

■ All pins except CE are ignored.

■ Crystal oscillator is stopped. XIN is HIGH, and

XOUT is LOW.

■ PLL operation is stopped. DO and LD are high

impedance, AI and FIN are HIGH, and AO and
CHO are LOW.

■ Display segments are all OFF. COMA, COMB,

COMC, and S1 to S6 are LOW.

■ Current channel selection is stored.

input has been continuously LOW or HIGH for a
period of 3.2 to 6.4 ms. The output does not change
if the input state lasts less than 3.2 ms.

3.2ms(ts)

6.4ms

3.2 to 9.6ms

TR

TR is the transmit/receive select pin. Transmit is
selected when TR is HIGH, and receive is selected
when TR is LOW or open. When transmit mode is
selected, the channel up/down control is disabled,
and the state of pin EMG is accepted. TR incorpo­rates a pull-down resistor.

PA

PA is the PA display mode select pin. PA mode is
selected when pin PA is HIGH. When PA is open,
PLL operation is restored. PA incorporates a pull­down resistor.

In PA display mode, PLL operation is stopped and
the following states occur.

■ FIN and AI are HIGH.

■ CHO is LOW.

■ DO and LD are high impedance.

■ Current channel selection is stored.

■ “HIGH POWER” and “LOW POWER” display

indicators are OFF.

NIPPON PRECISION CIRCUITS—7

EMG

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SM5128A1

PRODUCT

EMG is the emergency channel select pin. The emer ­gency channel, channel 9, is selected when EMG is
HIGH, and the previously selected channel, deter-

EMG

0 to 51.2ms

25.6ms +Lock up time + 4.8ms

LD

25.6ms

PLL DATA

51.2ms 51.2ms

CHO

UP and DN

mined by the state of pins UP and DN, is selected
when EMG is LOW or open. EMG incorporates a
pull-down resistor.

25.6ms +Lock up time + 4.8ms

25.6ms

UP and DN are the channel up/down control pins,
respectively. They also serve as the fast up/down
function controls, in addition to their step up/down
functions. The fast change function is selected and
the channel change cycle becomes faster when a key
corresponding to either input pin is pressed continu­ously for a period longer than the wait time t

UP,DN

LD

25.6mS

PLL DATA

.

W

3.2 to 9.6mS

tW=870.4ms

51.2ms

Channel up/down operation is selected when EMG
and PA are LOW. Up/down operation is disabled
when CE is LOW (standby mode) and when TR is
HIGH (transmit mode).

25.6mS +Lock up time + 4.8mS

tF=102.4ms

NIPPON PRECISION CIRCUITS—8

LD

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SM5128A1

PRODUCT

LD is the unlock detector pin. The PLL is locked
when LD is HIGH, and the PLL is unlocked when
LD is LOW.

Inputs are LOW (case 1)

UP,DN

Phase
difference
(internal)

PLL DATA

LD

External disturbance (case 2)

Phase
difference
(internal)

LD goes LOW when UP, DN, TR and EMG are
LOW (case 1), and when the PLL becomes unlocked
due to an external disturbance (case 2).

tPW

tLD

tPW

tLD

LD

When the internal phase difference t

exceeds 1.6

PW

µs, the PLL unlocks and LD goes LOW. Subse­quently, when the difference is less than 1.6 µs for a
period of 4.8 ms, the hPLL locks and LD goes
HIGH.

NIPPON PRECISION CIRCUITS—9

Input Pin Priority

DISCONTINUED

SM5128A1

PRODUCT

The device operation for all possible input combina­tions is determined by the active level of the inputs
using the following input pin priority.

CE > PA > EMG > UP > DN

UP,DN

EMG

3.2 to 9.6ms

LD

PLL DATA

CHO

CHO

CHO is the channel change confirmation tone output,
and indicates that the frequency changed due to
switching UP, DN, TR and EMG. The output signal
is a 2.5 kHz tone of approximately 51.2 ms duration.

If a high priority pin goes LOW (active) while a
lower priority pin operation is in progress (from
when LD goes LOW until CHO output stops), the
operation stops and the higher priority pin operation
takes precedence.

25.6ms

25.6ms

CH9

LB

LB is the “LOW BATTERY” display indicator con­trol input. The indicator is lit when LB is LOW or
open, and the indicator is OFF when LB is HIGH.
LB incorporates a pull-down resistor. The state of
LB does not affect PLL operation.

HL

HL is the “HIGH POWER” and “LOW POWER”
display indicators control input. The “HIGH
POWER” indicator is lit when HL is HIGH, and the
“LOW POWER” indicator is lit when HL is LOW or
open. HL incorporates a pull-down resistor. The state
of HL does not affect PLL operation.

NIPPON PRECISION CIRCUITS—10

DISCONTINUED

LCD Common/Segment Output
Waveforms

1.6mS

VDD

SM5128A1

PRODUCT

Internal
reffrence clock

COM1

COM2

COM3

VSS3

VSS2

VSS1

VDD

VSS3

VSS2

VSS1

VDD

VSS3

VSS2

VSS1

VDD

VSS3

VSS2

VSS1

VDD

S outoput

VSS3

VSS2

VSS1

Power-ON Initialization

When power is applied between VDD and VSS, the
channel up/down and other controls are disabled in
the current channel is channel 9.

NIPPON PRECISION CIRCUITS—11

FREQUENCY TABLE

USA-specication

DISCONTINUED

SM5128A1

PRODUCT

Channel

1 5393 13.4825 3254 16.27

2 5395 13.4875 3256 16.28

3 5397 13.4925 3258 16.29

4 5401 13.5025 3262 16.31

5 5403 13.5075 3264 16.32

6 5405 13.5125 3266 16.33

7 5407 13.5175 3268 16.34

8 5411 13.5275 3272 16.36

9 5413 13.5325 3274 16.37

10 5415 13.5375 3276 16.38

11 5417 13.5425 3278 16.39

12 5421 13.5525 3282 16.41

13 5423 13.5575 3284 16.42

14 5425 13.5625 3286 16.43

15 5427 13.5675 3288 16.44

16 5431 13.5775 3292 16.46

17 5433 13.5825 3294 16.47

18 5435 13.5875 3296 16.48

19 5437 13.5925 3298 16.49

20 5441 13.6025 3302 16.51

21 5443 13.6075 3304 16.52

22 5445 13.6125 3306 16.53

23 5451 13.6275 3312 16.56

24 5447 13.6175 3308 16.54

25 5449 13.6225 3310 16.55

26 5453 13.6325 3314 16.57

27 5455 13.6375 3316 16.58

28 5457 13.6425 3318 16.59

29 5459 13.6475 3320 16.60

30 5461 13.6525 3322 16.61

31 5463 13.6575 3324 16.62

32 5465 13.6625 3326 16.63

33 5467 13.6675 3328 16.64

34 5469 13.6725 3330 16.65

35 5471 13.6775 3332 16.66

36 5473 13.6825 3334 16.67

37 5475 13.6875 3336 16.68

38 5477 13.6925 3338 16.69

N (T) VCO (MHz) N (R) VCO (MHz)

TR = HIGH TR = LOW (open)

NIPPON PRECISION CIRCUITS—12

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SM5128A1

PRODUCT

Channel

39 5479 13.6975 3340 16.70

40 5481 13.7025 3342 16.71

N (T) VCO (MHz) N (R) VCO (MHz)

TR = HIGH TR = LOW (open)

NIPPON PRECISION CIRCUITS—13

DISCONTINUED

SM5128A1

PRODUCT

NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products contained 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 licence 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
PrecisionCircuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or
modification.Products contained in this data sheet are not intended to be the devices which mat directly affect human lives due to failure
or malfunction. Customers are requested to consult with the sales department of Nippon Precision Circuits Inc. prior to considering our
products in such a special case.

NIPPON PRECISION CIRCUITS INC.

4-3, 2-chome Fukuzumi
Koto-ku, Tokyo 135, Japan

NIPPON PRECISION CIRCUITS INC.

Telephone: [phone]
Facsimile: 03-3642-6698

NC9608BE 2001.06

NIPPON PRECISION CIRCUITS—14