DS1239-10 Maxim Integrated Products, DS1239-10 Datasheet - Page 2

• Manufacturer Part Number: DS1239-10
• Description: IC MICROMAN W/FRESH 10% 16-DIP
• Manufacturer: Maxim Integrated Products
• Series: MicroManagerr
• Type: Battery Backup Circuitr

Specifications of DS1239-10

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 25 ms Minimum
• Voltage - Threshold: 4.37V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

DS1239 is identical to the DS1236 with two exceptions. The RC and RST pins have been replaced with
POWER SUPPLY CONTROL
The DS1239 facilitates the power-up and power-down sequencing of a main power supply from a
keyboard or pushbutton. The Power Supply Control Input (
are used for this purpose. Prior to establishing a voltage on V
level at all times with the V
connected to the V
directly to an optically isolated SCR to initiate an AC to DC power-up sequence. This in turn will provide
the supply voltage for V
output will supply a connection to the V
the supply voltage on V
and track the V
high level, the PSO output will return to tristate. Once the PSO output and V
subsequent falling edge on
current supplied by the
circuit. The battery size for this application must be selected to provide the SCR on-current for the power
supply response time and is consequently application-specific.
POWER SUPPLY CONTROL Figure 1
PSI
and PSO, respectively. Other pins and functions operate exactly as the DS1236 in NMOS mode.
CC
input. If V
BAT
to provide a high level. As shown in Figure 1, this active high signal can be wired
CC
PSI
CC
rises above the V
. The timing is illustrated in Figure 2. Holding the
BAT
CC
PSI
pin allows the use of a 0.1 F capacitor as a simple pushbutton debounce
does not rise above V
supply. When
will tristate PSO to initiate a shut down condition. The 10 microamp
BAT
BAT
pin until the V
PSI
level before the t
2 of 4
is forced low via a keypad or other source, the PSO is
BAT
before either t
PSI
CC
CC
reaches V
) and Power Supply Control Output (PSO)
(+5V), the
PSI
timeout, the PSO pin will remain high
PSI
BAT
or
PSI
, or a maximum of 500 ms. If
PSI
CC
is internally held at a high
PSI
are set at a high level, a
is allowed to return to a
input low, the PSO
DS1239