LC7267
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
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
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
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