Page 1
Ordering number: EN 1197F
CMOS IC
LC7265
Received Frequency Display for Radio Receivers
Features
.
Displays received frequency of each band of FM, MW, LW
(LED static display).
.
Counts local oscillation frequency and displays received
frequency.
.
Number of display digits : FM-5 digits, MW-4 digits, LW-3
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 : 10 kHz step display
+450 kHz : 1 kHz step display
+455 kHz : 1 kHz step display
.
Contains blanking circuit to turn off display.
.
Contains hold circuit to hold display contents.
.
Uses crystal resonator having 7.2 MHz reference frequency.
.
Uses LB3500 (÷8 prescaler) jointly at the time of FM
reception.
.
Supply voltage VDD:4.5Vto10V
+469 kHz : 1 kHz step display
Specifications
Package Dimensions
unit : mm
3025B-DIP42S
[LC7265]
SANYO : DIP42S
Absolute Maximum Ratings atTa=25°C, VSS=0V
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Input voltage V
Output voltage V
Allowable power dissipation Pd max Ta % 65°C 550 mW
Allowable power dissipation of
segment outputs
Operating temperature Topr –30 to +65
Storage temperature Tstg –40 to +125
max –0.3 to +11 V
DD
IN
1X
O
V
2 Output pins other than VO1 0 to 15 V
O
Pd (seg)1 MHz, b&c, b&e, V
Pd (seg) 2 Other outputs, V
Pd (seg) 3 MHz, b&c, b&e, V
Pd (seg) 4 Other outputs, V
All input pins –0.3 to VDD+0.3 V
, HLD, 50 Hz, output: off –0.3 to VDD+0.3 V
OUT
IOL=33mA
I
= 16.5 mA
OL
IOL=36mA
I
=18mA
OL
= 4.5 to 6.5 V,
DD
= 4.5 to 6.5 V,
DD
= 6.0 to 10 V,
DD
= 6.0 to 10 V,
DD
30 mW
15 mW
25 mW
12 mW
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
63098HA(II)/6088YT/9105KI/3173KI/D162KI/7162KI/6242KI,TS No.1197-1/6
C
°
C
°
Page 2
LC7265
Allowable Operating Ranges atTa=25°C, VDD= 4.5 to 10 V, VSS=0V
Parameter Symbol Conditions min typ max Unit
Supply voltage V
Input high-level voltage
Input low-level voltage
Input frequency
Input amplitude
Segment current
DD
V
1 A/F, BLK 0.7V
IH
V
2 FIF1, FIF2, FIF3, AIF1, AIF2 0.9V
IH
V
1 A/F, BLK 0 0.3V
IL
V
2 FIF1, FIF2, FIF3, AIF1, AIF2 0 0.1V
IL
f
IN
f
IN
f
IN
V
V
V
FMI, sine wave, capacitive coupling,
1
V
1 = 0.7Vp-p
IN
AMI, sine wave, capacitive coupling,
2
V
2 = 0.5Vp-p*
IN
3X
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
, sine wave, capacitive coupling,
X
IN
3
IN
f
3 = 0.2 to 7.5 MHz
IN
Iseg1 MHz, b&e, b&c
Iseg2 Other outputs 0 15 mA
4.5 10 V
DD
DD
V
V
DD
DD
DD
DD
V
V
V
V
1 18 MHz
0.5 3 MHz
0.2 7.5 MHz
0.7 0.9V
0.5* 0.9V
1.0 0.9V
DD
DD
DD
Vp-p
Vp-p
Vp-p
030mA
*: For fIN2 = 0.5 MHz to 0.9 MHz and VDD=8to10V,VIN2 min = 1.0 Vp-p applies.
Electrical Characteristics atTa=25°C, VDD= 4.5 to 10 V, VSS=0V
Parameter Symbol Conditions min typ max Unit
I
1 FIF1, FIF2, FIF3, AIF1, AIF2 VI=V
Input high-level current
Input low-level current
Input floating voltage V
Input/output high-level leakage
current
Output low-level voltage
IH
I
2 BLK VI=V
IH
1 FIF1, FIF2, FIF3, AIF1, AIF2 VI=V
I
IL
I
2 BLK VI=V
IL
I
3 A/F VI=V
IL
A/F VI= open 0.8V
IF
I
OFF
V
OL
V
OL
V
OL
V
OL
HLD, output off, VI=V
1 HLD, output on, IO=1mA 01V
b&e, b&c, MHz V
2
IOL=30mA
Segments other than above
3
V
DD
4 50 Hz, IO= 0.2 mA 0 1.0 V
Input high-level threshold voltage Vth HLD
Output off leakage current I
2 All segments output pins, VO= 13 V, output off 0 10 µA
OFF
FM mode, A/F = open or VDD,fIN1 = 18 MHz,
0.7Vp-p or (AM mode, A/F = VSS,fIN2=
3 MHz, 0.5Vp-p) fIN3 = 7.2 MHz, 1Vp-p
Current drain I
FIF1, FIF2, FIF3 = V
DD
AIF1, AIF2 = V
HLD, BLK = V
other pins open
DD
SS
SS
DD
= 4.5 to 10 V,
DD
= 4.5 to 10 V, IOL=15mA
DD
DD
DD
DD
SS
010µA
02µA
010µA
02µA
20 500 µA
DD
V
DD
V
02µA
0 0.7 V
0 0.7 V
0.4VDD0.5VDD0.7V
DD
V
018mA
Pin Assignment
Top view
No.1197-2/6
Page 3
Equivalent Circuit Block Diagram
LC7265
1. Display
1-1 Display font
1-2 Lighting system
.
Static lighting
1-3 Display range (High-order 1 digit : zero blanking)
.
FM : 00.00 MHz to 199.95 MHz 50 kHz step
.
MW, LW : 000 kHz to 1999 kHz 10 kHz or 1 kHz step
2. Pin Description
.
2-1
a to g, b&c, b&e, MHz, kHz : LED
2-2.VDD,VSS: Power supply pins
.
2-3
XIN,X
: Crystal resonator or input amp pin
OUT
No.1197-3/6
Page 4
2-4.FIF1, FIF2, FIF3 : FM IF select pins
FIF1 00001111
FIF2 00110011
FIF3 01010101
IF (MHz) +10.700 +10.725 +10.675 +10.750 –10.700 –10.725 –10.675 –10.650
2-5.AIF1, AIF2 : AM IF select pins
LC7265
AIF1 0011
AIF2 0101
IF (kHz) +450 (2) +450 (1) +455 +469
(Note) 450 kHz(1) : 10 kHz step display, others : 1 kHz step display
.
2-6
HLD : Display contents hold pin
Normally, this pin is set at high level. To hold display contents, this pin is set at low level. Connecting time constant circuit
to this pin makes it possible to hold display contents for a certain period of time at the time of FM/MW, LW band
selection.
Internal clock
A/F
HLD
.
2-7
BLK : Display blanking pin
Example of blanking misdisplay
at the time of application of power.
1 : High level (V
0 : Low level (V
Depending on C, R
Display contents hold
)
DD
)
SS
Threshold
voltage of
e
2-8.FMI, AMI : Local oscillation signal input pins
FMI — For FM : 0.7Vp-p input sensitivity
AMI — For MW, LW : 1.0Vp-p input sensitivity (V
0.5Vp-p input sensitivity (other than above)
.
A/F : FM/MW, LW select pin
2-9
FM — Pin open or high level
MW, LW — Low level
.
50 Hz : 50 Hz time base output pin
2-10
=8to10V,fIN= 0.5 to 0.9 MHz)
DD
No.1197-4/6
Page 5
LC7265
Hold time – time constant connected to HLD pin
To obtain 1-s hold time make time
constant connected to HLD pin 720 ms.
Note: time constant connected to HLD
pin must be 100 ms or more.
C = 2.2 µF
R = 470 kΩ
Hold time – ms
Time constant connected to HLD pin, (t = CR) – ms
I
DD–VDD
For FMI input : 18 MHz, 0.7Vp-p,
For AMI input : 3 MHz, 0.5Vp-p,
A/F=V
A/F=V
DD
SS
–mA
DD
Common conditions
Other pins open
For FMI input
For AMI input
Time constant connected to BLK pin − VDDrise time
If VDDrise time is 200 ms,
make time constant externally
Time constant connected
to BLK pin (t = CR) – ms
connected to BLK pin 200 ms
or more.
C=1µF
R = 200 kΩ
or more
VDDrise time – ms
IDD–Ta
For FMI input : 18 MHz, 0.7Vp-p, A/F = V
For AMI input : 3 MHz, 0.5Vp-p,A/F = V
DD
SS
–mA
DD
For FMI input
For AMI input
Current drain, I
Supply voltage, VDD–V
Vp-p – fIN1
Input amplitude – mVp-p
FMI input frequency, f
VDD–fIN1
Upper standard value. VDD= 15 V or more
–V
DD
1–Hz
IN
Current drain, I
Input amplitude – mVp-p
–V
DD
Common conditions
Other pins open
Ambient temperature, Ta –°C
Vp-p – fIN2
AMI input frequency, f
VDD–fIN2
Upper standard value
2–Hz
IN
Lower standard value
Supply voltage, V
FMI input frequency, fIN1 – MHz
Lower standard value
Supply voltage, V
AMI input frequency, fIN2 – MHz
No.1197-5/6
Page 6
LC7265
–V
t
HLD threshold voltage, V
– Ω
OUT
Vt–V
DD
Upper standard value
high-level threshold voltage
Lower standard value
low-level threshold voltage
Supply voltage, VDD–V
R
OUT–VDD
Segment outputs (IOL= 15 mA)
other than 5b&e, 1b&c, MHz
–V
t
BLK threshold voltage, V
Segment outputs other
than MHz, b&c, b&e
This data is in case of
flowing current to one
segment only.
–mA
OL
Vt–V
DD
Supply voltage, VDD–V
IOL–V
OL
Output current, I
Output impedance, R
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
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information hereinisaccurateand reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
Segment outputs (IOL= 30 mA)
of 5b&e, 1b&c, MHz
Supply voltage, VDD–V
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:
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Output voltage, VOL–V
This catalog provides information as of June, 1998. Specifications and information herein are subject to change without notice.
No.1197-6/6
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