Page 1
Ordering number: EN 1511B
CMOS IC
LC7267
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)
DD
.
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 VDD: 4.5 to 10.0 V.
Package Dimensions
unit : mm
3025B-DIP42S
[LC7267]
SANYO : DIP42S
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
Page 2
LC7267
Specifications
Absolute Maximum Ratings at VSS=0V
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Input voltage V
Output voltage V
Allowable power
dissipation
Allowable power
dissipation of segment
outputs
Operating temperature Topr –30 to +65 °C
Storage temperature Tstg –40 to +125 °C
max –0.3 to +11 V
DD
IN
1X
O
V
2 Output pins other than X
O
OUT
, output : off 0 to 15 V
OUT
–0.3 to VDD+0.3 V
–0.3 to VDD+0.3 V
Pd max Ta % 65°C 550 mW
Pd seg 1 PM V
Pd seg 2 b&e V
Pd seg 3 Other outputs V
I
OL
Pd seg 4 PM V
Pd seg 5 b&e V
Pd seg 6 Other outputs V
I
OL
= 4.5 to 6 V,IOL=50mA 35 mW
DD
= 4.5 to 6 V,IOL=33mA 30 mW
DD
= 4.5 to 6.5 V,
= 16.5 mA
DD
DD
=18mA
DD
= 6.0 to 10 V,IOL=54mA 38 mW
= 6.0 to 10 V,IOL=36mA 25 mW
= 6.0 to 10 V,
DD
15 mW
13 mW
Allowable Operating Conditions at Ta = 25°C, VSS=0V,VDD= 4.5 to 10 V
Parameter Symbol Conditions min typ max Unit
Supply voltage V
Input high-level voltage
Input low-level voltage
Input medium-level
voltage
Input frequency
Input amplitude
Segment current
DD
1 INHI, CTR/CLK, DEMAND 0.8V
V
IH
V
2 SET, FM/AM 0.85V
IH
V
V
V
V
V
f
f
f
V
V
V
FIF1, FIF2, FIF3
3
IH
AIF1, AIF2, 12H/24H
1 INHI, CTR/CLK, DEMAND 0 0.2V
IL
2 SET, FM/AM 0 0.15V
IL
FIF1, FIF2, FIF3
3
IL
AIF1, AIF2, 12H/24H
SET 0.45V
IM
1 FMI, sine wave, capacitive coupling, VIN1 = 0.7Vp-p 1 18 MHz
IN
2 AMI, sine wave, capacitive coupling, VIN2 = 0.5Vp-p 0.5 3 MHz
IN
3 XIN, sine wave, capacitive coupling, VIN3 = 1Vp-p 0.2 7.5 MHz
IN
FMI, sine wave, capacitive coupling,
1
IN
f
1=1to18MHz
IN
AMI, sine wave, capacitive coupling,
2
IN
f
2 = 0.5 to 3 MHz
IN
XIN, sine wave, capacitive coupling,
3
IN
f
3 = 0.2 to 7.5 MHz
IN
0.9V
Iseg 1 PM
Iseg 2 b&e
Iseg 3 Other outputs seg 15 mA
4.5 10 V
0.55V
V
DD
V
DD
V
DD
DD
DD
DD
DD
Vp-p
DD
Vp-p
DD
Vp-p
DD
DD
DD
DD
0 0.1V
DD
0.7 0.9V
0.5 0.9V
1.0 0.9V
45 mA
30 mA
V
V
V
V
V
V
V
Electrical Characteristics at VDD= 4.5 to 10 V, VSS=0V
Parameter Symbol Conditions min typ max Unit
FIF1 to FIF3, AIF1 to AIF2, SET, FM/AM, 12H/24H
1
I
IH
Input high-level current
Input low-level current I
Input floating voltage
CTR/CLK, V
I
2 INHI, VI=V
IH
I
3 DEMAND, VI=V
IH
FIF1 to FIF3, AIF1 to AIF2, SET, FM/AM, 12H/24H,
IL
CTR/CLK, V
V
1 INHI, VI= open 0 0.2 V
IF
V
2 DEMAND, VI= open 0 0.1V
IF
I=VDD
SS
DD
I=VSS
010µA
40 1000 µA
40 1000 µA
–10 0 µA
V
DD
Continued next page.
No. 1511- 2/10
Page 3
Continued from preceding page.
Parameter Symbol Conditions min typ max Unit
Output low-level voltage
Output off leakage current I
Current drain I
Pin Assignment
LC7267
V
1PMVDD= 4.5 to 10 V, IOL=45mA 0 1.0 V
OL
V
2 b&e VDD= 4.5 to 10 V, IOL=30mA 0 1.0 V
OL
V
3 Other outputs seg, VDD= 4.5 to 10 V, IOL=15mA 0 1.0 V
OL
OFF
DD
All segments output pins, V
FM mode, FM/AM = VDD,fIN1 = 18 MHz, 0.7Vp-p
(or AM mode, FM/AM = V
f
3 = 7.2 MHz, 1Vp-p,
IN
FIF1, FIF2, FIF3 = V
AIF1, AIF2 = V
12H/24H, CTR/CLK, INHI, DEMAND = V
DD
DD
=13V 0 10 µA
OUT
2 = 3 MHz, 0.5Vp-p)
SS,fIN
DD
18 mA
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.
Font
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
No. 1511- 3/10
Page 4
LC7267
.
VDD,VSS: Power supply pin
.
XIN,X
.
FIF1, FIF2, FIF3: FM IF offset value select pin
.
AIF1, AIF2: AM IF offset value select pin
: Crystal oscillator, input amplifier pin
OUT
Crystal oscillator Input amplifier
FIF1 00001111
FIF2 00110011
FIF3 01010101
IF (MHz) +10.700 +10.725 +10.675 +10.750 –10.700 –10.725 –10.675 –10.650
AIF1 0011
AIF2 1001
IF (kHz) +450 (1) +450 (2) +455 +469
Display step 10 kHz 1 kHz step
(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
0 1 Mode of setting by the time signal and hours-minutes setting mode
0 0 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 ata2Hzrate 1.2 seconds after the pin is set to ‘‘H’’ level.
Low level: Execution of setting by the time signal and minutes setting
Advance ata2Hzrate 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
1: High level
0: Low level
No. 1511- 4/10
Page 5
Make connection of the highest-order digit as shown below.
LC7267
12-hour system
Timing Chart
Time setting (CTR/CLK = ‘‘L’’)
DEMAND pin
Setting by the
time signal and
minutes setting
Hours setting
and minutes
setting
SET pin
DEMAND pin
SET pin
(Hours setting)
Execution of counting
30min. or more as 1hr.
and disregarding 29min. or less
Flashing (2 Hz)
for setting by
the time signal
24-hour system
Flashing (2Hz) for setting by
the time signal
Mode of setting by
the time signal
Within 1.0 s.
Hours-minutes
setting mode
Flashing stop
Execution of hours
1.2s
setting
(Advance at a 2 Hz rate)
t: Approximately 100 ms.
1.2 s. or more
Hours-minutes display
Flashing (2 Hz)
for setting by
the time signal
Flashing stop
Hours-minutes
setting mode
Minutes
advance at
a 2 Hz rate
Hours-minutes
setting mode
Flashing stop
1.2s
Execution of minutes
setting
(Advance at a 2 Hz rate)
Hours-minutes
display
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
Execute setting by
the time signal with
the SET pin.
Flashing ata2Hzrate when in
the mode of setting by the time
signal
Hours-minutes display: Display of PM 12:34
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
Hours-minutes setting: Setting to PM 11:45 from PM 11:23
Set the SET pin to
or VSS. After
V
DD
lapse of 1.2 s,
flashing stops and
PM sign Flashing at
a 2 Hz rate
hours or minutes
advance at a 2 Hz
rate.
PM
sign
Flashing at a 2 Hz rate
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).
Set the SET pin to V
setting is executed.
Set the SET pin to V
setting is executed.
SS
DD
, and
, and
No. 1511- 5/10
Page 6
Equivalent Circuit Block Diagram
LC7267
No. 1511- 6/10
Page 7
Sample Application Circuit 1
5-digit display in FM use
LC7267
Surge voltage eliminator
LED display tube (anode common)
Interface
AM
local
select SW
FM/AM display
LB3500
1/8 prescaler
Inter-
face
FM
local
Hours-
minutes
setting SW
(Must be mounted as close to
each pin as possible.)
*: Ceramic capacitor
No. 1511- 7/10
Page 8
Sample Application Circuit 2
4-digit display in FM use
(For details, see LED catalog.)
Reference: LED display tube
LED display tube (anode common)
LC7267
Surge voltage eliminator
Hours-
minutes
setting SW
1/8 prescaler
LB3500
Inter-
select SW
FM/AM display
FM
face
local
(Must be mounted as close to
each pin as possible.)
*: Ceramic capacitor
Interface
AM
local
(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.
No. 1511- 8/10
Page 9
LC7267
I
DD
DD–VDD
DD
For FMI input
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
–mA
FIF1, FIF2, FIF3 = V
AIF1, AIF2 = V
DD
Current drain, I
Supply voltage, VDD–V
Vp-p – f
DD
For AMI input
I1
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
FIF1, FIF2, FIF3 = V
AIF1, AIF2 = V
–mA
12H/24H, CTR/CLK, INHI, DEMAND = V
DD
DD
DD
For AMI input
Current drain, I
Ambient temperature, Ta – °C
IDD–Ta
For FMI input
Vp-p – f
DD
I2
Input amplitude, Vp-p – Ω
FM/AM = V
Upper standard value
VDD= 15 V or more
–V
DD
Supply voltage, V
–V
t
FMI input frequency, fI1–Hz
V
DD–fI1
DD
FMI input frequency, fI1–Hz
Vt–V
DD
Input amplitude, Vp-p – Ω
–V
DD
Supply voltage, V
–V
t
AMI input frequency, fI2–Hz
VDD–f
Upper standard value
Lower standard value
I2
AMI Input Frequency, fI2–Hz
Vt–V
DD
High-level
threshold voltage
Upper standard
value
INHI threshold voltage, V
SET threshold voltage, V
Supply voltage, VDD–V
Low-level threshold voltage
Supply Voltage, VDD–V
Lower standard value
No. 1511- 9/10
Page 10
I
OL–VOL
Segment outputs other than PM, 5b&e
This data is in case of flowing current to one
segment only.
–mA
OL
LC7267
– Ω
OUT
Segment
output
=30mA)
(I
OL
of 5b&e
R
OUT–VDD
Segment outputs
= 15 mA) other than PM, 5b&e
(I
OL
Output current, I
Output impedance, R
Output voltage, VOL–V
Segment output
= 45 mA) of PM
(I
OL
Supply voltage , VDD–V
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:
1 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:
2 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.
PS No. 1511- 10/10
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