Lm1881

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LM1881 Video Sync Separator

May 2006

LM1881 Video Sync Separator
General Description
The LM1881 Video sync separator extracts timing information including composite and vertical sync, burst/back porch timing, and odd/even field information from standard negative going sync NTSC, PAL* and SECAM video signals with amplitude from 0.5V to 2V p-p. The integrated circuit is also capable ofproviding sync separation for non-standard, faster horizontal rate video signals. The vertical output is produced on the rising edge of the first serration in the vertical sync period. A default vertical output is produced after a time delay if the rising edge mentioned above does not occur within the externally set delay period, such as might be the case for a non-standard video signal.

Featuresn n n n n n n n n AC coupled composite input signal > 10 kΩ input resistance < 10 mA power supply drain current Composite sync and vertical outputs Odd/even field output Burst gate/back porch output Horizontal scan rates to 150 kHz Edge triggered vertical output Default triggered vertical output for non-standard video signal (video games-home computers)

Connection Diagram
LM1881N

00915001Order Number LM1881M or LM1881N (0˚C to +70˚C) See NS Package Number M08A or N08E

*PAL in this datasheet refers to European broadcast TV standard “Phase Alternating Line”, and not to Programmable Array Logic.

© 2006 National Semiconductor Corporation

DS009150

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LM1881

Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, pleasecontact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Input Voltage Output Sink Currents; Pins, 1, 3, 5 Output Sink Current; Pin 7 Package Dissipation (Note 2) 13.2V 3 VP-P (VCC = 5V) 6 VP-P (VCC ≥ 8V) 5 mA 2 mA 1100 mW

Storage Temperature Range ESD Susceptibility (Note 3) ESD Susceptibility (Note 4) Soldering Information Dual-In-LinePackage (10 sec.) Small Outline Package Vapor Phase (60 sec.) Infrared (15 sec.)

−65˚C to +150˚C 2 kV 200 V 260˚C 215˚C 220˚C

Electrical Characteristics LM1881
VCC = 5V; RSET = 680 kΩ; TA = 0˚C to +70˚C by correlation with 100% electrical testing at TA=25˚C Parameter Supply Current DC Input Voltage Input Threshold Voltage Input Discharge Current Input Clamp Charge Current RSET PinReference Voltage Composite Sync. & Vertical Outputs Outputs at Logic 1 Pin 2 (Note 6) Pin 2; VIN = 2V Pin 2; VIN = 1V Pin 6; (Note 7) IOUT = 40 µA; Logic 1 IOUT = 1.6 mA Logic 1 Burst Gate & Odd/Even Outputs Composite Sync. Output Vertical Sync. Output Burst Gate Output Odd/Even Output Vertical Sync Width Burst Gate Width Vertical Default Time 2.7 kΩ from Pin 5 to VCC (Note 8) IOUT = 40 µA; Logic 1 VCC =5V VCC = 12V VCC = 5V VCC = 12V VCC = 5V VCC = 12V Conditions VCC = 5V VCC = 12V 1.3 55 6 0.2 1.10 4.0 11.0 2.4 10.0 4.0 11.0 Min Typ (Note 5) 5.2 5.5 1.5 70 11 0.8 1.22 4.5 3.6 4.5 0.2 0.2 0.2 0.2 190 2.5 32 230 4 65 0.8 0.8 0.8 0.8 300 4.7 90 1.35 Max 10 12 1.8 85 16 Units mA V mV µA mA V V V V V V V V µs µs µs

IOUT = −1.6 mA; Logic 0; Pin 1 IOUT = −1.6 mA; Logic 0; Pin 3 IOUT = −1.6 mA;Logic 0; Pin 5 IOUT = −1.6 mA; Logic 0; Pin 7

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LM1881

Electrical Characteristics LM1881

(Continued)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Note 2: Foroperation in ambient temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a package thermal resistance of 110˚C/W, junction to ambient. Note 3: ESD susceptibility test uses the “human body model, 100 pF discharged through a 1.5 kΩ resistor”. Note 4: Machine Model, 220 pF – 240 pF discharged through all pins. Note 5: Typicals are at TJ = 25˚C and...
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