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LMH1251 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LMH1251
Description  YPBPR to RGB Decoder and 2:1 Video Switch
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 2 page
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Truth Table
TABLE 1. Input Select
Pin 24
OUT
0
RGBhv input Ch
1YP
BPR input Ch
TABLE 2.
Pin 23
Pin 22
SYNC
Format Detection
Decoding Scheme
0
0
Bi-Level
Manual
480p
0
1
Tri-Level
Manual
720p/180i
1
*Outputs 0
Bi-Level
Auto
480p
1
*Outputs 1
Tri-Level
Auto
720p/1080i
Note: * When Pin 23 is set high, the LMH1251 is in Auto Mode, in which it can
detect the incoming video format (SD or HD) and apply the appropriate
color decoding and sync processing. With Auto Mode, Pin 22 becomes
an output pin, and will either output a logic high or low to notify the user
of the format that is being detected by the LMH1251. If Pin 23 is set
low, the LMH1251 is in Manual Mode, in which the user must specify
the format with Pin 22. With Manual Mode, Pin 22 is an input pin. Since
Pin 22 is a bi-directional pin, care must be taken to not apply any
voltages to it when it is in the Auto Mode, in which it functions as an
output pin. The use of the Auto Mode with Pin 22 left floating is typically
recommended.
TABLE 3. Power Save
Pin 21
Low Power Mode
0
Disable
1
Enabled
Ordering Information
Package
Part Number
Package Marking
Transport Media
NSC Drawing
24-Pin TSSOP
LMH1251MT
LMH1251MT
61 Units/Rail
MTC24
LMH1251MTX
2.5k Units Tape and Reel
www.national.com
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