CMOS LSI
Ordering number : EN4305A
52295TH (OT) No. 4305-1/3
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Dual VCO
LC7444
Overview
The LC7444 consists of two independent VCO (voltage
controlled oscillator) circuits.
These circuits support VCO operation with only the
addition of external resistors that determine the oscillation
range.
Features
• Two independent VCO circuits
• The oscillator frequency range can be set with external
resistors.
• Good linearity in the voltage - frequency conversion
characteristics
• High-impedance oscillator control voltage input
• CMOS clock output
• Fabricated in a CMOS process for lower power
• Oscillator frequency range: 8 to 32 MHz
• Operating supply voltage: 5 V ± 10%
• Package: DIP14
Package Dimensions
unit: mm
3003A-DIP14
Specifications
Absolute Maximum Ratings at Ta = 25 ± 2°C, VSS1 = VSS2 = 0 V, VDD= VDD1, VDD2
Allowable Operating Ranges at Ta = –10 to +70°C, VSS1 = VSS2 = 0 V, VDD= VDD1, VDD2
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
DD
max –0.3 to +7.0 V
Maximum input voltage V
IN
max –0.3 to VDD+ 0.3 V
Maximum output voltage V
OUT
max –0.3 to VDD+ 0.3 V
Allowable power dissipation Pd max 300 mW
Operating temperature Topr –10 to +70 °C
Storage temperature Tstg –55 to +125 °C
Parameter Symbol Conditions min typ max Unit
Supply voltage V
DD
4.5 5.0 5.5 V
Input high level voltage V
IH
ENA1, ENA2 0.7 V
DD
V
Input low level voltage V
IL
ENA1, ENA2 0.3 V
DD
V
Oscillator range resistors Rrng R1, R2 6.8 13 kΩ
[LC7444]
SANYO: DIP14
Electrical Characteristics at Ta = 25 ± 2°C, VDD= 5 V ± 10%, VSS1 = VSS2 = 0 V, VDD= VDD1, VDD2
Note: 1.
2. Duty: Du
Du =
× 100
Pin Assignment
tH
tH + tL
No. 4305-2/3
LC7444
Parameter Symbol Conditions min typ max Unit
Output high level voltage V
OH
OUT1, OUT2: IOH= –1 mA VDD– 0.4 V
Output low level voltage V
OL
OUT1, OUT2: IOL= 1 mA 0.4 V
Quiescent current I
DDS
ENA1, ENA2 = VDD, FC1, FC2 = V
SS
2 mA
Operating current drain I
DD
R1 = R2 = 7.5 kΩ, no output load,
7 mA
oscillator clock = 20 MHz
Input leakage current I
IH
, I
IL
–1 +1 µA
Oscillator clock frequency
fo
R1, R2 = 6.8 kΩ, FC1, FC2 = V
SS
to V
DD
*1
16 32 MHz
operating range
R1, R2 = 13 kΩ, FC1, FC2 = V
SS
to V
DD
*1
8 16 MHz
Duty Du *2 50 %
PS No. 4305-3/3
LC7444
Pin Functions
Sample Application
Pin No. Symbol Function
1 V
DD
1 Power supply
2 OUT1 VCO1 clock output
3 TEST1 Test pin. Must be tied low in normal operation.
4 ENA1 VCO1 enable input
5 R1 VCO1 oscillator range resistor
6 FC1 VCO1 control voltage input
7 V
SS
1 Ground
Pin No. Symbol Function
8 V
SS
2 Ground
9 FC2 VCO2 control voltage input
10 R2 VCO2 oscillator range resistor
11 ENA2 VCO2 enable input
12 TEST2 Test pin
13 OUT2 VCO2 clock output
14 V
DD
2 Power supply
This catalog provides information as of May, 1995. Specifications and information herein are subject to change
without notice.
■ 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:
➀ 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:
➁ 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.
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