MICRF010 View Datasheet(PDF) - Micrel
Part Name
Description
Manufacturer
MICRF010 Datasheet PDF : 14 Pages
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Micrel
MICRF010
DO Pin
The output stage for the digital output (DO) is shown in
Figure 4. The output is a 45µA push and 45µA pull
switched-current stage. This output stage is capable of
driving CMOS loads. An external buffer-driver is
recommended for driving high capacitance loads.
VDD
Compa-
rator
45uA
DO
45uA
VSS
Figure 4. DO Pin
REFOSC Pin
The REFOSC input circuit is shown in Figure 5. Input
impedance is quite high (290kΩ). This is a Colpitts
oscillator, with internal 10pF capacitors.
Externally applied signals should be AC-coupled,
amplitude limited to approximately 0.5VPP. The nominal
DC bias voltage on this pin is 1.4V
REFOSC
10pF
Active
Bias
200k
250
VDD
10pF
30uA
VSS
VSS
Figure 5. REFOSC Pin
SHUT Pin
VDD
Q1
VSS
SHUT
Q2
to Interna
Circuits
Q3
VSS
Figure 6. SHUT Pin
Control input circuitry is shown in Figure 6. The standard
input is a logic inverter constructed with minimum geometry
MOSFETs (Q2, Q3). P-Channel MOSFET Q1 is a large
channel length device, which functions essentially as a
“weak” pull-up to VDDBB. Typical pull-up current is 5µA,
leading to an impedance to the VDD supply of typically
1MΩ.
June 2005
10
M9999-063005
(408) 955-1690
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