Page 1
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.
Monolithic Linear IC
Video Switch for TV/VCR Use
Ordering number:ENN3353A
LA7956
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Features
• 4 inputs, 1 output, 75Ω termination, driver on-chip.
• 6dB amplifier on-chip.
• Excellent crosstalk characteristic.
• Wide band.
Specifications
Maximum Ratings at Ta = 25˚C
retemaraPlobmySsnoitidnoCsgnitaRtinU
egatlovylppusmumixaMV
V
1egatlovylppustupnimumixaM
2egatlovylppustupnimumixaMV
tnerructuptuomumixaMI
noitapissidrewopelbawollAxamdP 045Wm
erutarepmetgnitarepOrpoT 56+ot02–
erutarepmetegarotSgtsT 051+ot55–
4
V
xam 41V
7
V,xam
6
V,xam
8
9
V,xam
2
3
xam 01Am
1
Package Dimensions
unit:mm
3017D-SIP9
[LA7956]
22.0
(4.5)
1
(0.84)
,xam
xam
xamVCCV41=41V
Ta≤65˚C
2.54
0.5
9
0.51min
1.3
SANYO : SIP9
3.0
5.7max
3.2
0.25
1.35
8V
˚C
˚C
Operating Conditions at Ta = 25˚C
retemaraPlobmySsnoitidnoCsgnitaRtinU
egnaregatlovgnitarepOV
egatlovylppusdednemmoceRV
po 5.31ot5.01V
CC
CC
O2500TN (KT)/O3095MH/3260TA, TS No.3353–1/4
21V
Page 2
LA7953
Operating Characteristics at Ta = 25˚C, VCC=12V
retemaraPlobmySsnoitidnoC
niardtnerructnecseiuQI
egatlovsaibtupnIV
egatlovsaibtuptuOV
egatlovtesffoCDtuptuOV
egatlovdlohserhtlortnoC
tnerructupnilortnoCI
niagegatloVVGV,zHM1=f
scitsiretcarahcycneuqerF-VG
egnarcimanydtuptuOV
)2etoN(klatssorCC
The current flowing into the IC is defined as positive and current from the IC is defined as negative.
Video Switch Truth Table
2S
)2niP(
HH NOFFOFFOFFO
LH FFONOFFOFFO
HL FFOFFONOFFO
LL FFOFFOFFONO
3S
V
)3niP(
1NI
V
)4niP(
2NI
)6niP(
CC
4V,6V,8V,9
1
SO
VH2V,H3,3.2V
VL2V,
L3
2I,3
f
RD
T
V
3NI
)8niP(
)1etoN(05–005+Vm
NI
V,zHM01=f
NI
V,zHk51=f
V
V
V
NI
NI
NI
4NI
)9niP(
)1etoN(p-pV2=6.51.64.6Bd
)1etoN(zHk001=ftaBd0
p-pV1=
)1etoN(zHM3=f,p-pV1=)84(05)55(85Bd
)1etoN(zHM5=f,p-pV1=)54(54)25(55Bd
sgnitaR
nimpytxam
511203Am
5.38.31.4V
6.41.66.7V
7.0V
02–6–Aµ
3–0 Bd
)1etoN(p-pV5.1=4.15.1p-pV
tinU
Note 1 : Refer to this Truth Table and make measurements by switching S2, S3.
Note 2 : ( ) : Crosstalk between pins 8 and 9.
Input/Output Equivalent Circuit
Equivalent Circuit Block Diagram
No.3353–2/4
Page 3
Test Circuit
LA7953
Design Notes
An improvement in the DC clamp circuit has improved the sync signal compression attributable to the signal source
impedance, but the response time of the DC clamp is made longer accordingly than that of the LA7952. Make
adjustments by connecting a high resistance (several hundred kΩ) across input pin and GND (decreasing the resistance makes the sync signal compression larger).
No.3353–3/4
Page 4
LA7956
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 October, 2000. Specifications and information herein are subject
to change without notice.
PS No.3353–4/4
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