TMC57750PM

Application Specific Clock/Timing Overview

The TMC57750PM is a monolithic integrated circuit designed to supply timing signals for the Texas Instruments TC255 monochrome CCD image sensor. It generates CCD drive signals and EIA-170 television-synchronization signals at standard video rates. The device requires a single 5-V supply voltage and a 25-MHz timing crystal or oscillator. Key features include antiblooming-frequency selection, external synchronization, fixed electronic-shutter selection, electronic auto-iris, and window selection. It operates from -20°C to 45°C in a 64-pin plastic flat package.

Application Specific Clock/Timing Feature Summary

• Generates EIA-170 timing and synchronization signals including composite sync, blank, and field index.
• Supports multiple operational modes: Auto-iris, Random shutter, Flickerless, and Manual shutter.
• Provides configurable antiblooming gate frequencies (6.25 MHz or 12.5 MHz) via ABGSEL input.
• Includes electronic-windowing options with selectable regions to optimize exposure.

Application Specific Clock/Timing Applications

• Driving the TI TC255 monochrome CCD image sensor.
• Providing sampling, clamping, and synchronizing signals for the SN76121OFR video processor.
• Video camera systems requiring RS-170 standard timing.

Application Specific Clock/Timing Procurement Notes

Verify the specific suffix PM indicates the 64-pin LQFP plastic quad flatpack package as described in the datasheet. Confirm the operating temperature range of -20°C to 45°C meets system requirements. Ensure the design accommodates the required 25-MHz crystal or oscillator connection on XIN/XOUT or CLKIN pins.

Application Specific Clock/Timing Selection Notes

Select this component specifically for driving the TI TC255 CCD sensor. Verify compatibility with the 5-V supply voltage and 25-MHz master clock requirement. Consider the need for level-shifting devices like the TMC57253 if interfacing directly with the CCD. Check if the available shutter modes and windowing options satisfy the application's imaging constraints.

Application Specific Clock/Timing Part Context

The TMC57750 is part of Texas Instruments' legacy lineup of CCD timer controllers. It was published in June 1994 (SOCS041). It serves as a dedicated interface between video processing logic and CCD sensors, handling complex timing sequences for parallel transfer, serial readout, and optical black clamping.

Application Specific Clock/Timing Replacement Considerations

No direct public substitute part numbers are listed in the provided documentation. Legacy CCD timer solutions may require redesigning the timing circuitry due to differences in pinouts and control logic compared to modern digital timers.

Application Specific Clock/Timing FAQ

What is the maximum supply voltage for the TMC57750?

The recommended operating supply voltage (VCC) is 5 V, with a maximum absolute rating of 6 V.

How is the antiblooming frequency selected?

The ABGSEL input selects the frequency. A high state selects 6.25 MHz, while a low state selects 12.5 MHz.

What crystal frequency is required?

A 25-MHz timing crystal or crystal oscillator is required to generate the master clock.