Voltage References

MAXIMUM RATINGS
MC44615A
Rating Symbol Value Unit
Supply Voltage - Positive Vee +6.0 Vdc
-Negative VEE -6.0
Ambient Temperature TA 01070 °e
Storage Temperature Tstg -6510+150 °e
Junction Temperature TJ 150 °e
RECOMMENDED OPERATING CONDITIONS
Characteristics Pln(s) Symbol Value Unit
Supply Voltage - Positive 1 Vee +4.5 to +5.5 Vdc
-Negative 40 VEE -5.5to-4.5
Horizontal Sync 3 Hin kHz
Frequency - Max 63
-Min 10
Pulse Width - Max 12 I1S
-Min 2.0
Pulse Amplitude - Max Voltage (Tip) Vee Vdc
- Min Voltage (Baseline) (see Figure 2) VEE +0.5
Vertical Sync 39 Vin Hz
Frequency - Max 120
-Min 45
Pulse Width - Max 12
-Min 5.0
Pulse Amplitude - Max Voltage (Tip) Vee Vdc
- Min Voltage (Baseline) (see Figure 2) VEE +0.5
Peak Output Load eurrent 11-14, IL ±2.5 rnA
16/17,19/20,
22123, 25/26,
28/29, 32133,
35/36
Introduction
The MC44615A will provide 9 pairs, a function and its
complement, of waveforms. These waveforms can then be
used by the projection control circuitry for convergence.
The inputs ofthe MC44615A are the horizontal and vertical
frequencies and an optional blanking input. Adapting this
device to these frequencies is made by choosing external
resistor - capacitor pairs. The enable input, a threshold sense
that trips nominally at 2.5 V, can be used to delay the
appearance of the waveforms and/or to tum off the waveforms
during the blanking interval (or at any other time).
Inputs
Waveforms to the horizontal and vertical inputs (Pins 3, 39)
must meet similar requirements except for the frequencies
involved. The requirements can be described as follows:
3.0 V < Yin Peak < 5.0 V;
-4.5 V < Yin Baseline :s; 2.0 V.
2.0 11S:s; Pulse Width < 1/(fH) (Horizontal Input);
2.0 11S:s; Pulse Width < 1/(fv) (Vertical Input);
and the allowable frequencies of operation are:
10 kHz:s; fH:S; 63 kHz,
50 Hz:s; fH:S; 120 Hz
FUNCTIONAL DESCRIPTION
Figure 2 shows these requirements.
Figure 2. Valid Input Levels for Both
Horizontal (Pin 3) and Vertical (Pin 39) Inputs
5.DVmax
3.DVmin
2.DVmax
MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA
9-260
-4.5 Vmin •• - - - - -
The blanking input, Pin 2, presents at least 500 kn to
external signals and has a threshold of approximately
+2.5Vdc. At voltages greater than this threshold, the outputs
are present. This pin can be biased high to keep the
waveforms on, controlled by an external voltage to blank the
output waveforms when desired, or charged-up with an
external RC to delay the appearance of the output waveforms
during power-up. During blanking, the output voltages are
o Vdc ± 50 mV and power supply current remains unchanged.
Since the input pins are all equipped with ESD diodes,
voltages on these pins should never exceed VCC or VEE by
more than 0.5V.