Rainbow Electronics MAX7375 - Manual (Page 4)

MAX7375
Detailed Description
The MAX7375 is a replacement for ceramic resonators,
crystals, and crystal oscillator modules as the clock
source for microcontrollers and UARTs in 3V, 3.3V, and
5V applications. The MAX7375 is an integrated oscilla-
tor, supplied at specific frequencies just like crystals
and resonators. A variety of popular standard frequen-
cies are available. No external components are
required for setting or adjusting the frequency.
Supply Voltages
The MAX7375 has been designed for use in systems
with nominal supply voltages of 3V, 3.3V, or 5V and is
specified for operation with supply voltages in the 2.7V
to 5.5V range. Operation outside this range is not guar-
anteed. See the Absolute Maximum Ratings table for
limit values of power-supply and pin voltages.
Oscillator
The clock output is a push-pull configuration and is
capable of driving a ground-connected 1k
Ω load or a
positive supply connected 500
Ω load to within 300mV
of either supply rail. The clock output remains stable
over the full operating voltage range and does not gen-
erate short output cycles during either power on or
power off. A typical startup characteristic is shown in
the Typical Operating Characteristics section.
Output Jitter
The MAX7375’s jitter performance is given in the
Electrical Characteristics table as a peak-to-peak value
obtained by observing the output of the MAX7375 for
20s with a 500MHz oscilloscope. Jitter measurements
are approximately proportional to the period of the out-
put frequency of the device. Thus, a 4MHz part has
approximately twice the jitter value of an 8MHz part.
The jitter performance of all clock sources degrades in
the presence of mechanical and electrical interference.
The MAX7375 is relatively immune to vibration, shock,
and EMI influences and thus provides a considerably
more robust clock source than crystal- or ceramic-res-
onator-based oscillator circuits.
3-Pin Silicon Oscillator
4 _______________________________________________________________________________________
PIN
SC70 SOT23
NAME FUNCTION
1 2 V+ Positive Supply Voltage
2 1 CLOCK Clock output. Output is push-pull.
3 3 GND Ground
Pin Description
Typical Operating Characteristics (continued)
(V+ = 5V, T A = +25 °C, C
L = 10pF, 8MHz output, unless otherwise noted.)
CLOCK OUTPUT WAVEFORM
WITH C L = 50pF
MAX7375 toc09
40ns/div
CLOCK
1V/div
V+ = 3.3V
CLOCK OUTPUT WAVEFORM
WITH C L = 100pF
MAX7375 toc10
40ns/div
CLOCK
1V/div
V+ = 3.3V