SILAN SC7461-100, SC7461-101, SC7461-103, SC7461-104 Datasheet
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.
FEATURES
* CMOS Technology
* Low Power Consumption
* 32+3 Function Keys
* Least External Components
* Wide range of operating voltage: V
* 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
APPLICATIONS
* TV and VCR
* Audio Equipment
ORDERING INFORMATION
Valid Part Number Package Custom Code in Mask ROM
SC7461-100 SOP-24 C6~C12=1000000
SC7461-101 SOP-24 C6~C12=0000000
SC7461-103 SOP-24 C6~C12=0010000
SC7461-104 SOP-24 C6~C12=1010000
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
=2.0~5.5V
DD
ORDERING INFORMATION
Part No. Package
SC7461 SOP-24-375-1.27
* Audio Cassette Deck
* Air Conditioner
* Multi-Media DVD Player
1
SC7461
SOP-24
Rev: 2.2 2002-02-28.
Silan
Semiconductors
PIN CONFIGURATION
BLOCK DIAGRAM
KI0
1
KI1
2
KI2
KI3
3
4
Input
Scan
Circuit
KI0
KI1
KI2
KI3
C4
C5
OUT
V
DD
TEST
OSCI
OSCO
ss
V
OSCI OSCO V
OSC Circuit
Key
Timing
Generation
&Control Circuit
Code GenerationCircuit
Key OutputTiming SignalGenerator
1
2
3
4
5
6
SC7461
7
8
9
10
11
12
1110 8 12
Output Circuit
C3
24
C2
23
C1
22
C0
21
KO0
20
KO1
19
KO2
18
KO3
17
KO4
16
KO5
15
KO6
14
KO7
13
DDVSS
SC7461
OUT
7
C0
21
C1
22
Custom
Code
Register
23
24
C2
C3
C4
5
C5
6
1920 1718 1416 13149
TEST
KO0 KO1 KO2 KO3 KO4 KO5 KO6 KO7
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2 2002-02-28.
2
Silan
Semiconductors
ABSOLUTE MAXIMUM RATING
Characteristic Symbol Description Value Unit
Maximum Supply Voltage V
Input Voltage V
Output Voltage V
Output Current I
Allowable Power Dissipation Pd
Storage Temperature T
Operating Temperature T
(Tamb=25°C, unless otherwise specified)
V
DD(max)
IN
OUT
OUT
(max)
stg
opr
DD
Each Input pin Vss-0.3~VDD+0.3 V
-- Vss-0.3~VDD+0.3 V
OUT -35 mA
Ta<=85°C
-- -40~+125
-- -10~+70
ELECTRICAL CHARACTERISTICS
Parameter Symbol Test conditions Min Typ Max Unit
Operating Supply Current I
Quiescent Supply Current I
High Level Output Current
High Level Output Voltage V
Low Level Output Voltage V
Output OFF-State Leakage Current I
Custom Code High Level Input Current I
Custom Code Low Level Input Current I
Input Floating Voltage V
Input Pull-Down Resistance R
(Tamb=25°C,VDD=3.0V,unless otherwise specified)
Key ON, Output: no load 1 mA
DD
All keys OFF, OSC stops 1
DS
I
OH1
I
OH2
OFF
OH
OL
IH
IL
VDD=1.8V, VOH=1.0V -8 mA
VDD=3.0V, VOH=2.0V -25 mA
IOH=1mA 2.4 V
IOL=1mA 0.2 V
-- 1
VIN=V
DD
VIN=V
SS
IF
IN
-- 0.1V
-- 75 100 125
-1
RECOMMENDED OPERATING CONDITIONS
(Tamb=25°C, fosc=455kHz,unless otherwise specified)
Characteristic Symbol Min. Typ. Max. Unit
Supply Voltage V
High Level Input Voltage V
Low Level Input Voltage V
Oscillation Frequency fosc 400 455 500 KHz
DD
IH
IL
2.0 3.0 3.3 V
0.7V
DD
Vss 0.3V
SC7461
Vss-0.3~10 V
150 mW
1
DD
V
DD
DD
°C
°C
V
V
µA
µA
µA
µA
V
kΩ
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2 2002-02-28.
3
Silan
Semiconductors
PIN DESCRIPTION
Pin No. Symbol I/O Description
1~4 KI0~KI3 I Key Input Pins
7 OUT O Output Pins For Transit LED Drive
8VDD-- Power Supply
9 TEST I LSI Test Pin. This pin is normally set to High State or Floating.
10 OSCI I Oscillator Input Pin
11 OSCO O Oscillator Output Pin
12 V
13~20 KO7~KO0 O Key Scan Timing Signal Output Pins
21~24
5,6
SS
C0~C3
C4~C5
-- Power Supply Vss=GND
Custom Code Input Pins. Capable of externally setting 6 out of
I
13 bits for custom coding.
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.
SC7461
V
DD
100pF
455KHz
100pF
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
SC7461
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2 2002-02-28.
4
Silan
Semiconductors
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
SC7461
84 1612 24200 28
51 139 2117 2925
62 1410 2218 3026
73 1511 2319 3127
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.
KI0
KI1
KI2
KI3
Key D0 D1 D2 D3 D4 D5 D6 D7
K20+K2110101100
K20+K2201101100
K20+K2311101100
NOTE: Key Data--D6 and D7 may be preset to "0", "1" by mask option.
Key 20
Key 21
(H=Key-ON)
Key 22
Key 20
Transmission
Key 20&21
Transmission
Data
FIGURE 3. TRANSMISSION DATA DI AGRAM
Data
Key 21
Transmission
Data
Transmission
Stops
Key 22
Transmission
Data
Key 20&22
Transmission
Data
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 2.2 2002-02-28.
5
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