Digital Display of Clock/Receiving Frequency

for Radio Set Applications

Functions

Capable of selecting receiving frequency display/time
display.

Display of receiving frequency at each band of FM/MW/LW

Display element:

LED

Static/dynamic:

Static

Withstand voltage at output pin: 15 V
Maximum current:

18 mA
(V

= 6.0 to 10.0 V)

Number of display digits:

FM: 5 digits, MW, LW: 4 digits

Covers intermediate frequencies shown below.

FM:

+10.700, +10.725, +10.750, +10.675 MHz
10.700, 10.725, 10.675, 10.650 MHz

MW, LW:

+450 kHz (1) : 10 kHz-step display
+450 kHz (2) : 1 kHz-step display
+455 kHz

: 1 kHz-step display

+469 kHz

: 1 kHz-step display

In FM reception applications, the LB3500 (

8 prescaler) is

used jointly.

Two selections of display system (12-hour system with PM
sign, 24-hour system).

Easy to set time by the time signal.

Inhibit pin for inhibiting time setting with display unlighted.

7.2 MHz crystal oscillator for reference frequency.

Supply voltage V

: 4.5 to 10.0 V.

Package Dimensions

unit : mm

3025B-DIP42S

[LC7267]

SANYO : DIP42S

Ordering number: EN 1511B

CMOS IC

LC7267

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

63098HA (II) No.1511 - 1/10

Specifications

Absolute Maximum Ratings

at V

= 0 V

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

max

0.3 to +11

Input voltage

0.3 to V

+0.3

Output voltage

OUT

0.3 to V

+0.3

Output pins other than X

OUT

, output : off

0 to 15

Allowable power
dissipation

Pd max

65°C

550

Allowable power
dissipation of segment
outputs

Pd seg 1

PM V

= 4.5 to 6 V, I

= 50 mA

Pd seg 2

b&e V

= 4.5 to 6 V, I

= 33 mA

Pd seg 3

Other outputs V

= 4.5 to 6.5 V,

= 16.5 mA

Pd seg 4

PM V

= 6.0 to 10 V, I

= 54 mA

Pd seg 5

b&e V

= 6.0 to 10 V, I

= 36 mA

Pd seg 6

Other outputs V

= 6.0 to 10 V,

= 18 mA

Operating temperature

Topr

30 to +65

°C

Storage temperature

Tstg

40 to +125

°C

Allowable Operating Conditions

at Ta = 25°C, V

= 0 V, V

= 4.5 to 10 V

Parameter

Symbol

Conditions

min

typ

max

Unit

Supply voltage

4.5

Input high-level voltage

INHI, CTR/CLK, DEMAND

0.8V

SET, FM/AM

0.85V

FIF1, FIF2, FIF3
AIF1, AIF2, 12H/24H

0.9V

Input low-level voltage

INHI, CTR/CLK, DEMAND

0.2V

SET, FM/AM

0.15V

FIF1, FIF2, FIF3
AIF1, AIF2, 12H/24H

0.1V

Input medium-level
voltage

SET

0.45V

0.55V

Input frequency

FMI, sine wave, capacitive coupling, V

1 = 0.7Vp-p

MHz

AMI, sine wave, capacitive coupling, V

2 = 0.5Vp-p

0.5

MHz

XIN, sine wave, capacitive coupling, V

3 = 1Vp-p

0.2

7.5

MHz

Input amplitude

FMI, sine wave, capacitive coupling,
f

1 = 1 to 18 MHz

0.7

0.9V

Vp-p

AMI, sine wave, capacitive coupling,
f

2 = 0.5 to 3 MHz

0.5

0.9V

Vp-p

XIN, sine wave, capacitive coupling,
f

3 = 0.2 to 7.5 MHz

1.0

0.9V

Vp-p

Segment current

Iseg 1

Iseg 2

b&e

Iseg 3

Other outputs seg

Electrical Characteristics

at V

= 4.5 to 10 V, V

= 0 V

Parameter

Symbol

Conditions

min

typ

max

Unit

Input high-level current

FIF1 to FIF3, AIF1 to AIF2, SET, FM/AM, 12H/24H
CTR/CLK, V

= V

µA

INHI, V

= V

1000

µA

DEMAND, V

= V

1000

µA

Input low-level current

FIF1 to FIF3, AIF1 to AIF2, SET, FM/AM, 12H/24H,
CTR/CLK, V

= V

µA

Input floating voltage

INHI, V

= open

0.2

DEMAND, V

= open

0.1V

Continued next page.

LC7267

No. 1511- 2/10

Continued from preceding page.

Parameter

Symbol

Conditions

min

typ

max

Unit

Output low-level voltage

PM V

= 4.5 to 10 V, I

= 45 mA

1.0

b&e V

= 4.5 to 10 V, I

= 30 mA

1.0

Other outputs seg, V

= 4.5 to 10 V, I

= 15 mA

1.0

Output off leakage current

OFF

All segments output pins, V

OUT

= 13 V

µA

Current drain

FM mode, FM/AM = V

, f

1 = 18 MHz, 0.7Vp-p

(or AM mode, FM/AM = V

, f

2 = 3 MHz, 0.5Vp-p)

3 = 7.2 MHz, 1Vp-p,

FIF1, FIF2, FIF3 = V

AIF1, AIF2 = V

12H/24H, CTR/CLK, INHI, DEMAND = V

Pin Assignment

Configuration and Display Font

4 or 4-1/2-digit segment LED's are used to display time and frequency in the display font shown below.

Lighting System

Static lighting

Display Range

Frequency (MW, LW)

000 kHz to 1999 kHz (The highest-order digit ``0'' is blanked out.)

Frequency (FM)

00.00 MHz to 199.95 MHz (The highest-order digit ``0'' is blanked out.)

Clock (12-hour)

PM 12:00 to PM 11:59

12:00 to 11:59

Clock (24-hour)

0:00 to 23:59 (The highest-order digit ``0'' is blanked out.)

Pin Description

a to g, PM, b&e: LED driver pin

Font

LC7267

No. 1511- 3/10

, V

Power supply pin

, X

OUT

Crystal oscillator, input amplifier pin

FIF1, FIF2, FIF3: FM IF offset value select pin

FIF1

FIF2

FIF3

IF (MHz)

+10.700

+10.725

+10.675

+10.750

10.700

10.725

10.675

10.650

AIF1, AIF2: AM IF offset value select pin

AIF1

AIF2

IF (kHz)

+450 (1)

+450 (2)

+455

+469

Display step

10 kHz

1 kHz step

1: High level
0: Low level

(Note) 450 kHz (1): 10 kHz-step display, others: 1 kHz-step display

FMI, AMI: Local OSC signal input pin

FMI: For FM
AMI: For MW, LW

FM/AM:

FM/MW, LW select pin
FM:

High level

MW, LW: Low level

CTR/CLK: Frequency display/time display select pin

CTR (Counter): High level
CLK (Clock):

Low level

DEMAND: Input pin for instructing execution of setting

CTR/CLK

DEMAND

MODE

Mode of setting by the time signal and hours-minutes setting mode

Time display mode

SET:

Input pin for setting hours-minutes

This pin is set at ``M'' level normally. The input signal of ``H''/``L'' level acts as follows:
When in the mode of setting by the time signal and hours-minutes setting mode (CTR/CLK = ``L'', DEMAND = ``H'')

High level: Execution of hours setting

Advance at a 2 Hz rate 1.2 seconds after the pin is set to ``H'' level.

Low level: Execution of setting by the time signal and minutes setting

Advance at a 2 Hz rate 1.2 seconds after the pin is set to ``L'' level.
Setting by the time signal is executed when the pin is set off within 1.0 second after set to ``L'' level.
No carry to high-order digit occurs.

INHI:

Input pin for turning OFF the segment pins, inhibiting the SET/DEMAND pin from functioning, and preventing the
AMI amp from operating

High level: Normal operation
Low level: Segment pin OFF, SET/DEMAND pin function inhibit

12H/24H: Input pin for selecting 12-hour system with PM sign/24-hour system

High level: 12-hour system with PM sign
Low level: 24-hour system

Crystal oscillator

Input amplifier

LC7267

No. 1511- 4/10

Make connection of the highest-order digit as shown below.

Timing Chart

Time setting (CTR/CLK = ``L'')

Sample Display at Each Display

(Setting by the time signal, hours-minutes display, hours-minutes setting)

Setting by the time signal: Setting to PM 12:00

Hours-minutes display: Display of PM 12:34

Hours-minutes setting: Setting to PM 11:45 from PM 11:23

12-hour system

24-hour system

Setting by the
time signal and
minutes setting

DEMAND pin

Flashing (2Hz) for setting by
the time signal

Mode of setting by
the time signal

Flashing stop

Hours-minutes
setting mode

Minutes
advance at
a 2 Hz rate

Hours-minutes
display

1.2 s. or more

Execution of counting
30min. or more as 1hr.
and disregarding 29min. or less

SET pin

Within 1.0 s.

Hours-minutes display

Hours setting
and minutes
setting

DEMAND pin

Flashing (2 Hz)
for setting by
the time signal

SET pin
(Hours setting)

Hours-minutes
setting mode

Flashing stop

1.2s

t: Approximately 100 ms.

Flashing (2 Hz)
for setting by
the time signal

Hours-minutes
setting mode
Flashing stop

Execution of minutes
setting
(Advance at a 2 Hz rate)

1.2s

Execution of hours
setting
(Advance at a 2 Hz rate)

Execute setting by
the time signal with
the SET pin.

Flashing at a 2 Hz rate when in
the mode of setting by the time
signal

PM
sign

When setting by the time signal is
executed, minutes become 00. If the
minutes display is at 30 to 59, hours are
incremented by 1 (counting 30 or more
as 1 hr. and disregarding 29 or less).

Flashing at a 2 Hz rate

The PM sign flashes in the afternoon when in the mode of
setting by the time signal, hours-minutes display,
hours-minutes setting.
(for 12-hour system).

PM sign

Set the SET pin to
V

or V

After

lapse of 1.2 s,
flashing stops and
hours or minutes
advance at a 2 Hz
rate.

PM sign

Flashing at
a 2 Hz rate

PM
sign

Set the SET pin to V

and

setting is executed.

Set the SET pin to V

and

setting is executed.

LC7267

No. 1511- 5/10

Sample Application Circuit 2

4-digit display in FM use

(Note) How to reduce current dissipation when display is turned off

To reduce current dissipation when display is turned off (INHI: ``L''), the circuit shown below must be connected to the
FMI pin.

Surge

voltage

eliminator

Reference:

LED

display

tube

(For

details,

see

LED

catalog.)

LED

display

tube

(anode

common)

local

Interface

FM/AM

display

select

local

Inter-

face

1/8

prescaler

LB3500

Hours-

minutes

setting

Ceramic

capacitor

(Must

mounted

each

possible.)

LC7267

No. 1511- 8/10

Current

drain,

For FMI input: 18 MHz,
0.7 Vp-p FM/AM = ``H''
For AMI input: 3 MHz,
0.5 Vp-p FM/AM = ``L''
Common conditions
12H/24H, CTR/CLK, INHI, DEMAND = V

FIF1, FIF2, FIF3 = VDD
AIF1, AIF2 = VDD For FMI input

For AMI input

Supply voltage, V

For FMI input: 18 MHz,
0.7 Vp-p FM/AM = ``H''
For AMI input: 3 MHz,
0.5 Vp-p FM/AM = ``L''

 Ta

Common conditions
FIF1, FIF2, FIF3 = V

AIF1, AIF2 = V

12H/24H, CTR/CLK, INHI, DEMAND = V

Current

drain,

For FMI input

For AMI input

Ambient temperature, Ta °C

 V

Input

amplitude,

Vp-p

FMI input frequency, f

Input

amplitude,

Vp-p

AMI input frequency, f

Vp-p f

FM/AM = V

Upper standard value
V

= 15 V or more

Supply

voltage,

FMI input frequency, f

Supply

voltage,

Upper standard value

Lower standard value

AMI Input Frequency, f

 f

INHI

threshold

voltage,

Supply voltage, V

SET

threshold

voltage,

High-level
threshold voltage

Upper standard
value

Lower standard value

Low-level threshold voltage

Supply Voltage, V

Vt V

LC7267

No. 1511- 9/10

No products described or contained herein are intended for use in surgical implants, life-support systems,
aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like,
the failure of which may directly or indirectly cause injury, death or property loss.

Anyone purchasing any products described or contained herein for an above-mentioned use shall:

Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation
and all damages, cost and expenses associated with such use:

Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or
implied regarding its use or any infringements of intellectual property rights or other rights of third parties.

This catalog provides information as of June, 1998. Specifications and information herein are subject to change without notice.

Segment outputs other than PM, 5b&e
This data is in case of flowing current to one
segment only.

Output

current,

Output voltage, V

Output

impedance,

OUT

Segment outputs
(I

= 15 mA) other than PM, 5b&e

Segment
output
(I

= 30 mA)

of 5b&e

Segment output
(I

= 45 mA) of PM

Supply voltage , V

 V

OUT

 V

LC7267

PS No. 1511- 10/10

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