ADM6305_12 Datasheet, PDF (1/12 Pages) Analog Devices – Multiple Input Programmable Supervisory ICs

Data Sheet
FEATURES
Adjustable input threshold voltage options: 0.4 V and 1.23 V
Pre-trimmed V_CC threshold options (ADM6306)
Increments between 2.5 V and 5 V
Manual reset input (ADM6306)
4 factory programmed reset timeout delays
1 ms, 20 ms, 140 ms, and 1.12 sec (minimum)
Reset output stage: active low, open drain
Low power consumption: 5 µA typical
Power supply glitch immunity
5-lead SOT-23 package
Temperature range: −40°C to +125°C
APPLICATIONS
Portable/battery-operated equipment
Microprocessor systems
Multivoltage applications
GENERAL DESCRIPTION
The ADM6305/ADM6306 are dual voltage supervisors
designed to monitor two supplies and provide a reset signal to
DSP- and microprocessor-based systems. Low supply current
and a small form factor make these devices suitable for portable
and battery-operated applications.
If a monitored power supply voltage falls below the minimum
voltage threshold, a single active low output asserts triggering a
system reset. Once all voltages rise above the selected threshold
level, the reset signal remains low for the reset timeout period.
Four reset timeout options are available.
The ADM6305 monitors two supplies via two adjustable
resistor-programmable undervoltage reset inputs. Both RST
IN1 and RST IN2 have a reset threshold of either 0.4 V or
1.23 V depending on the particular model; that is, the RST IN1
and RST IN2 threshold of the ADM6305DxARJZ model is
Multiple Input Programmable
Supervisory ICs
ADM6305/ADM6306
FUNCTIONAL BLOCK DIAGRAMS
V_CC
RST IN1
RST IN2
0.4V/1.23V
RESET
GENERATOR
RESET
0.4V/1.23V
ADM6305
GND
Figure 1.
V_CC
RST IN
1.23V
0.4V/1.23V
V_CC
MR
GLITCH
REJECTION
RESET
GENERATOR
RESET
ADM6306
GND
Figure 2.
1.23 V, while in the case of ADM6305DxARJZ1 model, it is
0.4 V. The V_CC input of the ADM6305 is not a monitored input.
The ADM6306 has one adjustable undervoltage reset input,
RST IN, which features a choice of reset threshold, 0.4 V or
1.23 V (see the Ordering Guide for more information). The
ADM6306 incorporates a variety of internally pretrimmed V_CC
undervoltage threshold options for monitoring supply voltages
in increments between 2.5 V and 5 V. The ADM6306 also
includes a manual reset input.
The ADM6305/ADM6306 RESET output remains valid as long
as V_CC exceeds 0.9 V.
The ADM6305/ADM6306 are available in a 5-lead SOT-23
package. These devices are specified over the temperature range
of −40°C to +125°C.
Rev. A
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