MICRF007 データシートの表示（PDF） - Micrel
部品番号
コンポーネント説明
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MICRF007 Datasheet PDF : 13 Pages
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MICRF007
VDD
Compa-
rator
1.5A
67.5A
CAGC
Timout
15A
675A
VSS
Figure 6. CAGC Pin
DO Pin
The output stage for the digital output (DO) in Figure 7.
The output is a 20µA push and 18µA 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
20µA
DO
18µA
VSS
Figure 7. DO Pin
REFOSC Pin
REFOSC
30pF
Active
Bias
VDDBB
200k
250
30pF
VSSBB
30µA
VSSBB
Micrel
Figure 8. REFOSC Pin
The reference oscillator (REFOSC) input circuit is shown in
Figure 8. Input impedance is high (290kΩ). This is a Colpitts
oscillator with internal 30pF capacitors. This input is intended
to work with standard crystal connected from this pin to the
VSS pin. The nominal DC bias voltage on this pin is 1.4V.
SHUT Pin
VDDBB
Q1
VSSBB
SHUT
Q2
to Internal
Circuits
Q3
VSSBB
Figure 9. SHUT Pin
Control input circuitry is shown in Figure 9. The standard
input is a logic inverter constructed with minimum geometry
MOSFETs (Q2, Q3). P-Channel MOSFET Q1 is a large chan-
nel length device, which functions essentially as a “weak”
pull-up to VDD. Typical pull-up current is 5µA.
M9999-021705
10
February 17, 2005
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