LMH1251MT National Semiconductor, LMH1251MT Datasheet - Page 2

• Manufacturer Part Number: LMH1251MT
• Description: IC,TV/VIDEO CIRCUIT,Video Switch,TSSOP,24PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LMH1251MT

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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Truth Table
TABLE 1. Input Select
TABLE 2.
Note: * When Pin 23 is set high, the LMH1251 is in Auto Mode, in which it can
TABLE 3. Power Save
Ordering Information
24-Pin TSSOP
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
Package
Pin 23
0
0
1
1
Pin 21
0
1
*Outputs 0
*Outputs 1
Pin 22
Pin 24
0
1
LMH1251MTX
Part Number
LMH1251MT
0
1
Tri-Level
Tri-Level
Bi-Level
Bi-Level
SYNC
Package Marking
LMH1251MT
2
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.
Format Detection
Low Power Mode
2.5k Units Tape and Reel
Manual
Manual
Enabled
Transport Media
Auto
Auto
Disable
61 Units/Rail
RGBhv input Ch
YP
B
P
R
OUT
input Ch
Decoding Scheme
720p/1080i
720p/180i
480p
480p
NSC Drawing
MTC24