MIC834 Micrel Semiconductor, MIC834 Datasheet - Page 4

• Manufacturer Part Number: MIC834
• Description: Comparator with Reference Advance Information
• Manufacturer: Micrel Semiconductor

MIC834
Block Diagram
Functional Description
The MIC834 monitors the input voltage and detects when it
is higher than a programmed level (plus V
tion asserts the active-high output. An external pull-up resis-
tor is used to produce a logic-one output. When the input
voltage falls below the programmed threshold (V
the output stage is on.
Voltage Low Output
The voltage-low output (OUT) is an active-high, open-drain
output which sinks current when the MIC834 detects a low
input voltage.
MIC834
V
TH
V
HYST
IN
INP
). This condi-
1
INP
< V
2
GND
REF
1.24V
Bandgap
Reference
High-Voltage
),
5
V
4
DD
VDD
Detect
Trip Points
Input voltage is monitored by a comparator via a voltage
divider network. The divided voltage is compared to an
internal reference voltage. When the voltage at the input pin
INP exceeds the internal reference voltage (plus V
output is pulled high by an external resistor.
V
threshold voltage for positive-going inputs. Decreasing in-
puts trip at the user-programmed threshold voltage.
The tolerance of the switching threshold on the falling edge
is equal to the tolerance of just the voltage reference. The
tolerance of the switching threshold on the rising edge is
equal to the tolerance of the voltage reference plus the
tolerance of the hysteresis voltage.
HYST
MIC834
is typically 23mV, and is added to the programmed
OUT
4
April 2000
HYST
Micrel
), the