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DS1239-10-DS1239S-10-DS1239S-5
MicroManager Chip
FEATURESProvides necessary control for start up and
shutdown of power supply from keyboardHolds microprocessor in check during power
transientsHalts and restarts an out-of-control
microprocessorMonitors push button for external overrideWarns microprocessor of an impending power
failureConverts CMOS SRAM into nonvolatile
memoryUnconditionally write-protects memory when
power supply is out of toleranceConsumes less than 100 nA of battery currentControls external power switch for high
current applicationsAccurate 10% power supply monitoringOptional 5% power supply monitoring
designated DS1239-5Provides orderly shutdown in nonvolatile
microprocessor applicationsSupplies necessary control for low-power
“stop mode” in battery operate hand-held
applicationsStandard 16-pin DIP or space-saving 16-pin
SOICOptional industrial temperature range -40°C
to +85°C
PIN ASSIGNMENT
PIN DESCRIPTIONVBAT - +3 Volt Battery Input
VCCO - Switched SRAM Supply Output
VCC - +5 Volt Power Supply Input
GND - Ground
PF - Power Fail (Active High) - Power Fail (Active Low)
WC/SC - Wake-Up Control (Sleep)
PSI - Power Supply Control Input
IN - Early Warning Input
NMI - Non-Maskable Interrupt - Strobe Input
CEO - Chip Enable Output
CEI - Chip Enable Input
PBRST - Pushbutton Reset Input
RST - Reset Output (Active low)
PSO - Power Supply Control Outputs
DESCRIPTIONThe DS1239 MicroManager provides all the necessary functions for power supply control and
monitoring, reset control, and memory backup in microprocessor-based systems. Using the DS1239, an
AC power switch is no longer required for microprocessor-based systems. A keyboard control system for
power supply start up and shutdown is provided through the use of the Power Supply Control Input and
DS1239
MicroManager Chip
www.dalsemi.comDS1239 16-Pin SOIC (300-mil)
See Mech. Drawings Section
VBAT
VCCO
VCC
PSO
RST
PBRST
GNDCEI413
WC/SC
CEO
NMI
PSIIN89
DS1239 16-Pin DIP (300-mil)
See Mech. Drawings Section
VBAT
VCCO
VCC
PSO
RST
PBRST
GNDCEI413
WC/SC
CEO
NMI
PSIIN89
DS1239
DS1239 is identical to the DS1236 with two exceptions. The RC and RST pins have been replaced with
PSI and PSO, respectively. Other pins and functions operate exactly as the DS1236 in NMOS mode.
POWER SUPPLY CONTROLThe DS1239 facilitates the power-up and power-down sequencing of a main power supply from a
keyboard or pushbutton. The Power Supply Control Input (PSI) and Power Supply Control Output (PSO)
are used for this purpose. Prior to establishing a voltage on VCC (+5V), the PSI is internally held at a high
level at all times with the VBAT supply. When PSI is forced low via a keypad or other source, the PSO is
connected to the VBAT to provide a high level. As shown in Figure 1, this active high signal can be wired
directly to an optically isolated SCR to initiate an AC to DC power-up sequence. This in turn will provide
the supply voltage for VCC. The timing is illustrated in Figure 2. Holding the PSI input low, the PSO
output will supply a connection to the VBAT pin until the VCC reaches VBAT, or a maximum of 500 ms. If
the supply voltage on VCC rises above the VBAT level before the tPSI timeout, the PSO pin will remain high
and track the VCC input. If VCC does not rise above VBAT before either tPSI or PSI is allowed to return to a
high level, the PSO output will return to tristate. Once the PSO output and VCC are set at a high level, a
subsequent falling edge on PSI will tristate PSO to initiate a shut down condition. The 10 microamp
current supplied by the PSI pin allows the use of a 0.1 μF capacitor as a simple pushbutton debounce
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
DS1239
POWER SUPPLY CONTROL TIMING Figure 2
ABSOLUTE MAXIMUM RATINGS*Voltage on VCC Pin Relative to Ground -0.5V to +7.0V
Voltage on I/O Relative to Ground -0.5V to VCC + 0.5V
Operating Temperature 0°C to 70°C
Operating Temperature (Industrial Version) -40°C to +85°C
Storage Temperature -55°C to +125°C
Soldering Temperature 260°C for 10 secondsThis is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
These specifications reflect the power supply control feature of the DS1239. For complete electrical
specifications, refer to the DS1236 data sheet.
DS1239
DC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC= 4.5V to 5.5V)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESPSI Output CurrentIPSI3μA
PSO Output CurrentIPSO10mA3
AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC= 4.5V to 5.5V)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESPSI to Valid VCCtPSI200ms1
PSI to PSO Tri-statetPST20ns
PSI to Valid PSOtPSO100ns
PSO Pulse WidthtPSP200500ms2
NOTES:1. Minimum turn-on response time for AC-to-DC power supply.
2. PSO pulse width for VCC held below VBAT.
3. PSO will typically source 1.5 mA at 1.5V with VCC= 0V, VBAT= 3V.
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
