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Last update: 29 March 2006

IC number:MC1377
IC function:RGB to PAL/NTSC encoder
Related components:CXA1145 (video encoder used in newer Amigas)

Component documentation
IC numberManufacturerDocumentation
MC1377MotorolaNot available

Component versions
IC numberPackageCBM part numberCBM part description
MC1377P20-pin DIP390085-01Video encoder - MC 1377

Positions
DevicePositionPackage
A1000U7ADIP
A1300U21DIP
A2032U1DIP
A520IC1DIP

Pinout
PinNameDescription
1trExternal components at this pin set the rise time of the internal ramp function generator.
2SyncComposite sync input. Presents 10k Ohm resistance to input.
3RRed signal input. Presents 10k Ohm impedance to input. 1.0 Vpp required for 100% saturation.
4GGreen signal input. Presents 10k Ohm impedance to input. 1.0 Vpp required for 100% saturation.
5BBlue signal Input. Presents 10k Ohm impedance to input. 1.0 Vpp required for 100% saturation.
6-YoutLuma (-Y) output. Allows external setting of luma delay time.
7VclampVideo Clamp pin. Typical connection is a 0.01 µF capacitor to ground.
8-YinLuma (-Y) input. Presents 10k Ohm input impedance.
9CVoutComposite Video output. 50 Ohm output impedance.
10ChromainChroma input. Presents 10k Ohm input impedance.
11B-YclampB-Y clamp. Clamps B-Y during blanking with a 0.1 µF capacitor to ground. Also used with R-Y clamp to null residual color subcarrier in output.
12R-YclampR-Y clamp. Clamps R-Y during blanking with a 0.1 µF capacitor to ground. Also used with B-Y clamp to null residual color subcarrier in output.
13ChromaoutChroma output. 50 Ohm output impedance.
14VCCPower supply pin for the IC; +12, ± 2.0 V, required at 35 mA (typical).
15GndGround pin.
16VB8.2 V reference from an internal regulator capable of delivering 10 mA to external circuitry.
17OscinOscillator input. A transistor base presents 5.0k Ohm to an external subcarrier input, or is available for constructing a Colpitts oscillator.
18OscoutOscillator output. The emitter of the transistor, with base access at Pin 17, is accessible for completing the Colpitts oscillator.
19ømQuad decoupler. With external circuitry, R-Y to B-Y relative angle errors can be corrected. Typically, requires a 0.01 µF capacitor to ground.
20NTSC/PAL SelectNTSC/PAL switch. When grounded, the MC1377 is in the NTSC mode; if unconnected, in the PAL mode.

Copyright © 2003-2006 Ronald van Dijk - All rights reserved