SOCS025B - FEBRUARY 1991
The TMS3472A serial driver is a monolithic CMOS integrated circuit designed to drive the serial-register gate (SRGn) and transfer gate (TRG) inputs of the Texas Instruments TC241(monochrome) CCD image sensor. The TMS3472A interfaces the TI TMS3471C or a user-defined timing generator to the TC241; it receives TTL signals from the timing generator and outputs level-shifted and slew-rate-adjusted signals to the image sensor. The TMS3472A contains three noninverting serial drivers and one noninverting transfer driver as well as circuitry for slew-rate adjustment.
The voltage levels on outputs SRG1OUT, SRG2OUT, SRG3OUT, and TRGOUT are controlled by the levels on the two dc supply inputs VSS and VCC. The inputs DLADJ\, PD\, SRG1IN, SRG2,3IN, and TRGIN are TTL compatible. A high level on the PD\ input allows the TMS3472 to operate normally with the level-shifted and slew-rate-adjusted outputs following the inputs. When PD\ is low, the device is in a low-power-consumption mode and all outputs are at VCC.
The slew rate of the SRG1OUT, SRG2OUT, and SRG3OUT outputs is controlled by connecting a resistor between VCC and the SSR input. The TRGOUT output slew rate is controlled by connecting a resistor between VCC and TSR. The larger the resistor values are, the longer the rise and fall times will be.
The TMS3472A is available in the surface-mount package (DW) and is characterized for operation from -20°C to 45°C.
This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic fields. These circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according to MIL-STD-883C, Method 3015; however, precautions should be taken to avoid application of any voltage higher than maximum-rated voltages to these high-impedance circuits. During storage or handling, the device leads should be shorted together or the device should be placed in conductive foam. In a circuit, unused inputs should always be connected to an appropriated logic voltage level, preferably either VCC or ground. Specific guidelines for handling devices of this type are contained in the publication Guidelines for Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies available from Texas Instruments.
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