CMOS IC
Infrared Remote Control Transmitter IC
Ordering number:ENN *3588
LC7464M
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
Preliminary
Overview
The LC7464M is a 64-key infrared remote control transmitter IC that incorporates all key-scanning, oscillator and
timing function on-chip, resulting in a very low external
component count.
The LC7464M generates 71 function codes using the 64
function keys. The output data format comprises the maskprogrammed custom code, the parity field, the mask-programmed system code, the product code, the function code
and the data check code.
The LC7464M operates from a 2.0 to 3.6 V supply and is
available in 24-pin MFPs.
Features
• Low external component count.
• 64 function keys.
• 71 function codes.
• Mask-programmable custom and system codes.
• 64 product codes.
• Output conforms to Japan’s Association for Electric Home
Appliances recommended standards for infrared remote
controls.
• On-chip input pull-down resistors.
• 2.0 to 3.6 V supply.
• 24-pin MFP.
Package Dimensions
unit:mm
3045B-MFP24
[LC7464M]
24
1
15.3
0.35
1.27
Pin Assignment
KI2
1
KI3
2
KI4
3
KI5
4
KI6
5
KI7
6
LC7464M
7
REM
V
8
DD
TEST
9
OSC1
10
11
OSC2
V
SS
12
13
12
2.15
0.1
0.67
SANYO : MFP24
24
KI1
23
KI0
22
KO0
KO1
21
20
KO2
19
KO3
18
KO4
KO5
17
16
KO6
KO7
15
GCL
14
GCH
13
7.9
0.15
2.5max
9.0
0.75
10.5
(Top View)
71901TN (KT)/2132JN No.3588–1/7
Block Diagram
LC7464M
Pin Description
rebmuNemaNtiucrictnelaviuqEnoitpircseD
42,32,6ot17IKot0IK stupnigninnacshctiwsyeK
7MERtuptuorevirdDEL
8V
9TSET noitarepolamronrofnepotfelroHGIHdeitebdluohsTSET.tupnitseT
011CSO noitcennoctupnirotallicsocimareC
112CSO noitcennoctuptuorotallicsocimareC
21V
41,31HCG,LCG stupnitcelesedoctcudorP
22ot517OKot0OK stuptuogninnacshctiwsyeK
DD
SS
egatlovylppuS
dnuorG
No.3588–2/7
LC7464M
Specifications
Absolute Maximum Ratings at Ta = 25˚C
retemaraPlobmySsnoitidnoCsgnitaRtinU
egatlovylppuSV
egnaregatlovtupnIV
egnaregatlovtuptuOV
tnerructuptuOI
noitapissidrewoPxamdP 051Wm
egnarerutarepmetgnitarepOrpoT –58+ot04
egnarerutarepmetegarotSgtsT –521+ot05
Recommended Operating Conditions at Ta = –40 to +85˚C
retemaraPlobmySsnoitidnoC
egatlovylppuSV
egatlov
egatlov
ycneuqerfrotallicsOf
tupnilevel-hgihHCGdnaLCG,7IKot0IK
tupnilevel-wolHCGdnaLCG,7IKot0IK
xamDD
I
O
O
Ta≤85˚C
DD
V
HI
V
LI
CSO
VSS–5.5+ot3.0V
VSS–Vot3.0
VSS–Vot3.0
sgnitaR
nimpytxam
0.2
V7.0
DD
V
SS
334554
3.0+
DD
3.0+
DD
–53Am
0.36.3V
V
DD
V3.0
DD
774
V
V
˚C
˚C
tinU
V
V
zHk
Electrical Characteristics at Ta = –40 to +85˚C, V
retemaraPlobmySsnoitidnoC
tnerrucylppusgnitarepOI
tnerrucylppusybdnatSI
tnerructuptuolevel-hgihMERI
egatlovtuptuolevel-hgih7OKot0OKV
egatlovtuptuolevel-wolMERdna7OKot0OKV
tnerructupnilevel-hgihHCGdnaLCGI
tnerructupnilevel-wolHCGdnaLCGI
egatlovgnitaolftupni7IKot0IKV
ecnatsisernwod-lluptupni7IKot0IKR
DD
SD
V
HO
HO
LO
HI
LI
FI
NI
DD
V
DD
IHO=– Am1.0
I
LO
VIV=
VIV=
= 2.0 to 3.6 V
DD
sgnitaR
nimpytxam
daolon,desserpyeK 1Am
deppotsrotallicso,desserpyekoN 1Aµ
V,V2=
V,V3=
Am1.0= 3.0V
DD
SS
–V1–5.2
HOV=DD
–V1–11
HOV=DD
VDD–3.0
1Aµ
–1 Aµ
V1.0
DD
57001
521
tinU
Am
V
V
kΩ
No.3588–3/7
LC7464M
Functional Description
Key Inputs
An eight-by-eight matrix is formed with the keyswitch
scanning outputs KO0 to KO7 and the keyswitch scanning inputs KI0 to KI7 as shown in the following figure.
When a key is held down, either the normal or abbreviated continuation code is output continously, depending
on the mask option selected.
Normally, only one key can be pressed at a time. If more
than one key is pressed, all keys are ignored and no
output is generated. However, when the appropriate mask
option is selected, up to three extra codes can be generated by holding down key 8 and either key 16, 24, 32, 40,
48, 56 or 64 as shown in table 1.
KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7
KO0
1
9
17
25
33
KO1
2
10
18
26
34
KO2
3
11
19
27
35
KO3
4
12
20
28
36
KO4
5
13
21
29
37
KO5
6
14
22
30
38
KO6
7
15
23
31
39
KO7
8
16
24
32
40
Table 1. Function code generation
noitanibmocyeK
0CF1CF2CF3CF4CF5CF6CF7CF
61,8 11101001
42,8 11100101
23,8 11101101
04,8 11100011
84,8 11101011
65,8 11100111
46,8 11101111
41
49
57
42
50
58
43
51
59
44
52
60
45
53
61
46
54
62
47
55
63
48
56
64
edocnoitcnuF
Output Data Configuration
The 48-bit output data configuration is shown in the
following figure. Note that the data is sent least-significant bit first.
C0 to C15
16-bit custom code 4-bit parity 4-bit system code 8-bit product code 8-bit function code 8-bit data check code
P0 to P3 SC0 to SC3 GC0 to GC7 FC0 to FC7 DC0 to DC7
Custom code
The 16-bit mask-programmable custom code (C0 to C15)
is a unique code registered with the Association for
Electric Home Appliances.
Parity bits
The four parity bits (P0 to P3) are used for error detection. Their value is given by the following equation.
Pn=Cn ⊕ C(n+4) ⊕ C(n+8) ⊕ C(n+12)
where n=0 to 3.
System code
The four-bit system code (SC0 to SC3) is mask-programmed into the LC7464M during fabrication.
Product code
The eight-bit product code (GC0 to GC7) consists of two
mask-programmable bits and six bits that are set by
connecting each of GCL and GCH to one of KO0 to
KO7. The block diagram of the product code generator is
shown in the following figure. GC1 and GC3 are the
mask-programmable bits, shown set to zero.
No.3588–4/7
LC7464M
Tables 2 and 3 show the relationships between GCL and
L0 to L2, and between GCH and H0 to H2, respectively.
Table 2. GCL product codes
niP
0OK 000
1OK 100
2OK 010
3OK 110
4OK 001
5OK 101
6OK 011
7OK 111
0L1L2L
detarenegedoC
Table 3. GCH product codes
niP
0OK 000
1OK 100
2OK 010
3OK 110
4OK 001
5OK 101
6OK 011
7OK 111
0H1H2H
detarenegedoC
Function code
The eight-bit function code (FC0 to FC7) is determined
by the number of the key pressed as shown in the following figure, Note that when the appropriate mask option is
selected, function codes 97H, A7H, B7H, C7H, D7H,
E7H and F7H can be generated by holding down key 8
and one of keys 16, 24, 32, 40, 48, 56 and 64.
Data Transmission Waveforms
Abbreviated transmission mode
Abbreviated mode detail
Data check code
The eight-bit data check code (DC0 to DC7) is generated
by adding the carry bits from the system code to the
product and function code bits. This code is used for
error detection. The data chek code is calculated using
the following equation.
DC=SC+GC0 to GC3+GC4 to GC7+FC0 to
FC3+FC4 to FC7
For example, when
SC=0H, GC=0B1H, FC=35H
DC=0H+1H+0BH+5H+3H=14H
No.3588–5/7
Normal transmission mode
LC7464M
Oscillator
The LC7464M contains a self-biasing CMOS inverter
that is used as an oscillator when connected to a ceramic
resonator as shown in the following figure. To reduce
power, the oscillator operates only when a key is pressed.
T ypical Application
No.3588–6/7
LC7464M
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer's
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer's products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products(including technical data,services) described or
contained herein are controlled under any of applicable local export control laws and regulations,
such products must not be exported without obtaining the export license from the authorities
concerned in accordance with the above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co. , Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification"
for the SANYO product that you intend to use.
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.
This catalog provides information as of July, 2001. Specifications and information herein are subject to
change without notice.
No.3588–7/7
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