SG536
Low EMI Clock Generator for Multi-Function Products
Approved Product
PIN DESCRIPTION
OSCin, OSCout
- These pins form an on-chip reference oscillator when connected to terminals of an external parallel
resonant crystal. OSCin may also serve as an input for an externally generated CMOS level or AC coupled reference
signal.
CPUsel(0:1)
- Input controls pins used to select the clock frequency of the CPUclk output. See table page 1. These
pins have internal pull-ups.
MODsel -
This pin is used to control the Spectrum Spread enable/disable. When Low, Spectrum Spread is not applied
to the CPUclk output. When High (default), this pin enables the CPUclk to be modulated at +/-1.25 % of its center
frequency as described in figure 2, Page 4 and reduces EMI as described in figure 1. It has an internal pull-up.
CPUclk
- SSCG modulated clock output for system CPU. Frequency may be selected based on the table on page 1.
SCNclk -
Non-modulated clock output for system scanner processing. It is centered exactly at 40.00000 MHz.
- Non-modulated clock output for system engine logic. It is centered exactly at 60.00000 MHz.
- Circuit positive power supply.
VIDclk
VDD
VSS
- Circuit ground.
A bypass capacitor (0.1µF) should be placed as close as possible to each VDD pin. If these bypass capacitors
are not close to the pins their high frequency filtering characteristic will be canceled by the lead inductances of
the traces.
MAXIMUM RATINGS
This device contains circuitry to protect the inputs
against damage due to high static voltages or electric
Voltage Relative to VSS:
Voltage Relative to VDD:
Storage Temperature:
Ambient Temperature:
Maximum Power Supply:
-0.3V
0.3V
field; however, precautions should be taken to avoid
application of any voltage higher than the maximum
rated voltages to this circuit. For proper operation, Vin
and Vout should be constrained to the range:
-65ºC to + 150ºC
-55ºC to +125ºC
7V
VSS<(Vin or Vout)<VDD
Unused inputs must always be tied to an appropriate
logic voltage level (either VSS or VDD).
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Rev.1.1
6/26/97
Page 2 of 6