MAX6895AAL MAXIM [Maxim Integrated Products], MAX6895AAL Datasheet - Page 6

• Manufacturer Part Number: MAX6895AAL
• Description: Ultra-Small, Adjustable Sequencing/Supervisory Circuits
• Manufacturer: MAXIM [Maxim Integrated Products]

Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
Figure 1. MAX6895/MAX6899 Functional Diagram
The MAX6895–MAX6899 is a family of ultra-small, low-
power, sequencing/supervisory circuits. These devices
provide adjustable voltage monitoring for inputs down to
0.5V. They are ideal for use in power-supply sequenc-
ing, reset sequencing, and power-switching applica-
tions. Multiple devices can be cascaded for complex
sequencing applications.
Voltage monitoring is performed through a high-imped-
ance input (IN) with an internally fixed 0.5V threshold.
When the voltage at IN falls below 0.5V or when the
enable input is deasserted (ENABLE = low or ENABLE =
high), the output deasserts (OUT goes low or OUT goes
high). When V
asserted (ENABLE = high or ENABLE = low), the output
asserts (OUT goes high or OUT goes low) after a capaci-
tor-programmable time delay.
With V
turn the output on or off. After the enable input is assert-
ed, the output turns on with a capacitor-programmable
delay period (A version) or with a 150ns propagation
delay (P version). Tables 1, 2, and 3 detail the output
state depending on the various input and enable condi-
tions.
6
IN
_______________________________________________________________________________________
IN
0.5V
250nA
above 0.5V, the enable input can be used to
IN
ENABLE (MAX6895)
ENABLE (MAX6899)
rises above 0.5V and the enable input is
1.0V
CDELAY
Detailed Description
LOGIC
GND
MAX6895
MAX6899
V
CC
OUT
The device operates with a V
1.5V to 5.5V. To maintain a 1.8% accurate threshold,
V
UVLO threshold, the output deasserts. When V
below 1.2V the output state cannot be determined. For
noisy systems, connect a 0.1µF ceramic capacitor from
V
push-pull active-high output option, a 100kΩ external
pulldown resistor to ground ensures the correct logic
state for V
Table 1. MAX6895/MAX6897 Output
Table 2. MAX6896/MAX6898 Output
Table 3. MAX6899 Output
CC
CC
V
V
V
V
V
V
V
V
IN
IN
IN
IN
IN
IN
IN
IN
to GND as close to the device as possible. For the
V
V
V
V
must be above 1.5V. When V
IN
< V
< V
> V
> V
IN
IN
IN
IN
IN
< V
< V
> V
> V
IN
< V
< V
> V
> V
TH
TH
TH
TH
CC
TH
TH
TH
TH
TH
TH
TH
TH
down to 0.
ENABLE
High
High
ENABLE
Low
Low
High
High
Low
Low
ENABLE
High
High
Low
Low
OUT = V
OUT = high impedance
(MAX6898)
OUT = V
OUT = high impedance
(MAX6898)
Low
OUT = V
OUT = high impedance
(MAX6898)
CC
Low
Low
Low
OUT = V
OUT = high impedance
(MAX6897)
Supply Input (V
supply voltage from
CC
CC
CC
CC
(MAX6896)
(MAX6896)
(MAX6896)
CC
OUT
falls below the
OUT
(MAX6895)
OUT
High
Low
Low
Low
CC
CC
falls
)