Datasheet
Applications Information
Interfacing to a Microcontroller Clock Input
The MAX7375 clock output is a push-pull, CMOS, logic
output, which directly drives any microprocessor (µP) or
microcontroller (µC) clock input. There are no impedance-
matching issues when using the MAX7375. Operate
the MAX7375 and microcontroller (or other clock input
device) from the same supply voltage level. Refer to the
microcontroller data sheet for clock input compatibility
with external clock signals.
The MAX7375 requires no biasing components or load
capacitance. When using the MAX7375 to retrofit a crys-
tal oscillator, remove all biasing components from the
oscillator input.
Startup Performance
The MAX7375 oscillator output stabilizes within a few
cycles of operation after V+ rises to a sufficient voltage to
start the oscillator, typically 1.65V at +25°C. Use a reset
or similar voltage-detection circuit to disable devices con-
nected to the MAX7375 until 5µs after the voltage on V+
has risen above 2.7V.
Extended Temperature Operation
The MAX7375 was tested to +135°C during product
characterization and shown to function normally at this
temperature (see Typical Operating Characteristics).
However, production test and qualification is only per-
formed from -40°C to +125°C at this time. Contact the
factory if operation outside this range is required.
Power-Supply Considerations
The MAX7375 operates with power-supply voltages in
the 2.7V to 5.5V range. Good power-supply decoupling
is needed to maintain the power-supply rejection per-
formance of the MAX7375. Use a 0.1µF surface-mount
ceramic capacitor connected between V+ and GND and
mounted as close as possible to the device. If possible,
mount the MAX7375 close to the microcontroller’s decou-
pling capacitor so that additional decoupling is not required.
A larger value of bypass capacitor is recommended if the
MAX7375 is to operate with a large capacitive load. Use
a bypass capacitor value of at least 1000 times that of the
output load capacitance.
PART FREQUENCY (MHz) TOP MARK
MAX7375AXR105 1.00 AOV
MAX7375AXR185 1.84 AOU
MAX7375AXR365 3.58 AOT
MAX7375AXR375 3.69 AOS
MAX7375AXR405 4.00 AOR
MAX7375AXR425 4.19 AOQ
MAX7375AXR805 8.00 AOP
CLOCK
1
3 GND
V+
MAX7375AXR
SC70
TOP VIEW
2
Chip Information
PROCESS: BiCMOS
MAX7375 3-Pin Silicon Oscillator
www.maximintegrated.com
Maxim Integrated
│
5
Selector Guide Pin Conguration