Silan
Semiconductors
INFRARED REMOTE CONTROL
TRANSMITTER
DESCRIPTION
The SC7461 is a remote control transmitter utilizing CMOS
Technology specially designed for infrared applications. It is
capable of controlling 32 function keys and 3 double keys. SC7461 is
housed in 24 pins, SO Package and provides 13 bits Custom Code.
SC7461
FEATURES
* CMOS Technology
* Low Power Consumption
* 32+3 Function Keys
* Least External Components
* Wide range of operating voltage: V
DD
=2.0~5.5V
* Double key operation(No order of priority given)
* On-Chip Oscillator can be constructed using an externally
connected ceramic resonator
* Up to 64 Custom Codes may be selected externally for SC7461
SOP-24
ORDERING INFORMATION
Part No.
SC7461
Package
SOP-24-375-1.27
APPLICATIONS
* TV and VCR
* Audio Equipment
* Audio Cassette Deck
* Air Conditioner
* Multi-Media DVD Player
ORDERING INFORMATION
Valid Part Number
SC7461-100
SC7461-101
SC7461-103
SC7461-104
Package
SOP-24
SOP-24
SOP-24
SOP-24
Custom Code in Mask ROM
C6~C12=1000000
C6~C12=0000000
C6~C12=0010000
C6~C12=1010000
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2
2002-02-28.
1
Silan
Semiconductors
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
24
23
22
21
20
SC7461
KI0
KI1
KI2
KI3
C4
C5
OUT
V
DD
TEST
OSCI
C3
C2
C1
C0
KO0
KO1
KO2
KO3
KO4
KO5
KO6
KO7
SC7461
19
18
17
16
15
14
13
OSCO
11
V
ss
12
BLOCK DIAGRAM
OSCI
OSCO
V
DD
V
SS
10
KI0
KI1
KI2
KI3
11
8
Output Circuit
12
7
21
OUT
C0
C1
C2
C3
C4
C5
1
OSC Circuit
2
3
4
Key
Input
Scan
Circuit
Timing
Generation
&Control Circuit
Custom
Code
Register
22
23
24
5
Code Generation Circuit
Key Output Timing Signal Generator
6
13
KO7
9
TEST
20
KO0
19
KO1
18
KO2
17
KO3
16
KO4
14
KO5
14
KO6
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2
2002-02-28.
2
Silan
Semiconductors
ABSOLUTE MAXIMUM RATING
(Tamb=25
°C,
unless otherwise specified)
Characteristic
Maximum Supply Voltage
Input Voltage
Output Voltage
Output Current
Allowable Power Dissipation
Storage Temperature
Operating Temperature
SC7461
Description
V
DD
Each Input pin
--
OUT
Ta<=85°C
--
--
Symbol
V
DD(max)
V
IN
V
OUT
I
OUT
Pd
(max)
T
stg
T
opr
Value
Vss-0.3~10
Vss-0.3~V
DD
+0.3
Vss-0.3~V
DD
+0.3
-35
150
-40~+125
-10~+70
Unit
V
V
V
mA
mW
°C
°C
ELECTRICAL CHARACTERISTICS
(Tamb=25
°C
, V
DD
=3.0V,unless otherwise specified)
Parameter
Operating Supply Current
Quiescent Supply Current
High Level Output Current
High Level Output Voltage
Low Level Output Voltage
Output OFF-State Leakage Current
Custom Code High Level Input Current
Custom Code Low Level Input Current
Input Floating Voltage
Input Pull-Down Resistance
Symbol
I
DD
I
DS
I
OH1
I
OH2
V
OH
V
OL
I
OFF
I
IH
I
IL
V
IF
R
IN
Test conditions
Key ON, Output: no load
All keys OFF, OSC stops
V
DD
=1.8V, V
OH
=1.0V
V
DD
=3.0V, V
OH
=2.0V
I
OH
=1mA
I
OL
=1mA
--
V
IN
= V
DD
V
IN
= V
SS
--
--
Min
Typ
Max
1
1
Unit
mA
µA
mA
mA
V
-8
-25
2.4
0.2
1
1
-1
0.1V
DD
75
100
125
V
µA
µA
µA
V
kΩ
RECOMMENDED OPERATING CONDITIONS
(Tamb=25°C, fosc=455kHz,unless otherwise specified)
Characteristic
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
Oscillation Frequency
Symbol
V
DD
V
IH
V
IL
fosc
Min.
2.0
0.7V
DD
Vss
400
Typ.
3.0
Max.
3.3
V
DD
0.3V
DD
Unit
V
V
V
KHz
455
500
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2
2002-02-28.
3
Silan
Semiconductors
PIN DESCRIPTION
Pin No.
1~4
7
8
9
10
11
12
13~20
21~24
5,6
SC7461
I/O
I
O
--
I
I
O
--
O
I
Key Input Pins
Output Pins For Transit LED Drive
Power Supply
LSI Test Pin. This pin is normally set to High State or Floating.
Oscillator Input Pin
Oscillator Output Pin
Power Supply Vss=GND
Key Scan Timing Signal Output Pins
Custom Code Input Pins. Capable of externally setting 6 out of
13 bits for custom coding.
Symbol
KI0~KI3
OUT
V
DD
TEST
OSCI
OSCO
V
SS
KO7~KO0
C0~C3
C4~C5
Description
FUNCTIONAL DESCRIPTION
1.OSCILLATION CIRCUIT
A self-biased type amplifier is housed by a CMOS Inverter Method. Thus, an oscillation circuit can be
constructed by connecting a ceramic resonator. Please refer to Figure 4 for the oscillation circuit diagram.
V
DD
100pF
455KHz
100pF
SC7461
FIGURE 1. OSCILLATION CIRCUIT DIAGRAM
Unless the keys are being operated, the oscillation is normally stopped. Thus, power consumption is considerably
reduced.
2.KEY INPUT
A total of 32 keys can be connected by Key Inputs--KI0~KI3 and Timing Signals--KO0~KO7. Double Key
Operation is possible for only Key No.20 in combination with the other keys connected to the KO5 line, namely: Key
No.21, 22 or 23. Thus, only the following key combinations may be used for the double key operation:
1).Key Nos.20 and 21
2).Key Nos.20 and 22
3).Key Nos.20 and 23
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2
2002-02-28.
4
Silan
Semiconductors
SC7461
There is no order of priority given in key input. This means that keys designated for the double keying operation
may be pressed in any sequence. When two keys (designated for the double key operation) are pressed
simultaneously, a series of pulse is outputted according to each key input. Pressing other keys that are NOT
intended for the double key operation do NOT generate any output.
The Key Matrix is given in the following diagram.
KO0 KO1 KO2 KO3 KO4 KO5 KO6 KO7
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
KI0
KI1
KI2
KI3
FIGURE 2. KEY MATRIX
3.DOUBLE KEY OPERATION
Double Key Operation is useful for tape deck recording operation. The following table shows the Key Data
corresponding to the double keys pressed. Also refer to the Key Input Section.
Key
K20+K21
K20+K22
K20+K23
D0
1
0
1
D1
0
1
1
D2
1
1
1
D3
0
0
0
D4
1
1
1
D5
1
1
1
D6
0
0
0
D7
0
0
0
NOTE: Key Data--D6 and D7 may be preset to "0", "1" by mask option.
Key 20
(H=Key-ON)
Key 21
Key 22
Key 20&21
Key 21
Key 22
Key 20&22
Key 20
Transmission
Transmission Transmission
Transmission Transmission Transmission
Stops
Data
Data
Data
Data
Data
FIGURE 3. TRANSMISSION DATA DIAGRAM
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2
2002-02-28.
5
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