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PDF PT7M7809 Data sheet ( Hoja de datos )
| Número de pieza | PT7M7809 | |
| Descripción | (PT7M7xxx) uP Supervisor Circuits | |
| Fabricantes | Pericom Technology | |
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Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
µP Supervisor Circuits
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Features
Discription
• Precision supply-voltage monitor
- 4.63V (PT7M7xxxL)
- 4.38V (PT7M7xxxM)
- 3.08V (PT7M7xxxT)
- 2.93V (PT7M7xxxS)
- 2.63V (PT7M7xxxR)
- 2.32V (PT7M7xxxZ)
- 2.20V (PT7M7xxxY)
- 4.00V (PT7M7xxxJ)
• 200ms reset pulse width
• Debounced CMOS-compatible manual-reset input
(7811, 7812, 7823, 7825, 7342-7344)
• Reset Output Signal for Watchdog and Power
Abnormal, Manual Reset
• Reset Push-Pull output (PT7M7809,7811,7823,
7824,7825,7342,7345)
• Reset Open-Drain output (PT7M7803/7343)
• Voltage monitor for power-fail or low battery warning
• Guaranteed RESET/RESET valid at VCC = 1.0V
Ordering Information
The PT7M7xxx family microprocessor (µP) supervisory
circuits are targeted to improve reliability and accuracy
of power-supply circuitry in µP systems. These devices
reduce the complexity and number of components
required to monitor power-supply and battery functions.
The main functions are:
1. Asserting reset output during power-up, power-down
and brownout conditions for µP system;
2. Detecting power failure or low-battery conditions with
a 1.25V threshold detector;
3. Watchdog functions;
4. Manual reset.
Applications
• Power-supply circuitry in µP systems
Note: lead free package is available by adding E at the end of each part no. For example: PT7M7803XTE for
SOT23-3 lead free package.
Suffix: X -- Monitored Voltage
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Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
µP Supervisor Circuits
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Pin Description
Pin Name Type
Description
M anual-Reset: (CM OS). Active low. Pull low to force a reset. Reset remains asserted for the duration
MR I of the Reset Timeout Period after MR transitions from low to high. Leave unconnected or connected to
VCC if not used.
Vcc
GND
Power
Ground
Power Supply: Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset remains
asserted until V rises above V and keep asserted for the duration of the Reset Timeout Period (t )
CC RST
RS
once VCC rises above VRST.
Ground Reference for all signals
PFI
I
Power-Fail Voltage M onitor Input. When PFI <VPFT , PFO goes low. Connect PFI to GND or Vcc
when not used.
PFO
O
Power-Fail Output: it gets low and sinks current when PFI is less than 1.25V; otherwise PFO stays
high.
Watchdog Input (CM OS). If WDI remains high or low for the duration of the watchdog timeout period
WDI
I
(tWD), the internal watchdog timer trigger a reset output. Floating WDI or connecting WDI to a high-
impedance three-state buffer disables the watchdog feature. The internal watchdog timer clears whenever
reset is asserted or WDI occurs a rising or falling edge.
RESET
RESET
Active-Low Reset Output (Push-Pull or Open-Drain). It goes low when Vcc is below the reset
O threshold. It remains low for about 200ms after one of the following occurs: Vcc rises above the reset
threshold (VRST), the watchdog triggers a reset, or MR goes from low to high.
O The inverse of RESET, active high. Whenever RESET is high, RESET is low.
NC - No connection
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Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
µP Supervisor Circuits
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Detailed Specifications
Absolute Maximum Ratings
Storage Temperature ......................................................... -65oC to +150oC
Ambient Temperature with PowerApplied ...........................-40oC to +85oC
Supply Voltage to Ground Potential (Vcc to GND) ............... -0.3Vto+7.0V
DC Input Voltage (All inputs except Vcc and GND) ......... -0.3VtoVCC+0.3V
DC Output Current (All outputs) ..................................................... 20mA
Power Dissipation ......................................................................... 320mW
(Depend on package)
Note:
Stresses greater than those listed under MAXI-
MUM RATINGS may cause permanent damage to
the device. This is a stress rating only and func-
tional operation of the device at these or any other
conditions above those indicated in the operational
sections of this specification is not implied. Expo-
sure to absolute maximum rating conditions for ex-
tended periods may affect reliability.
Recommended Operation Condition
DC Electrical Characteristics
Sym Description
Supply Voltage for 7xxxL/M/J
Supply Voltage for 7xxxT/S
VCC
Supply Voltage for 7xxxR/Z/Y
VIH Input High Voltage
V Input Low Voltage
IL
TA Operating Temperature
Test Conditions
Min Typ Max Unit
4.5 5.0 5.5 V
3.0 3.3 5.5 V
2.7 3.0 5.5 V
0.7VCC
-40
0.3V
CC
85
V
V
OC
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| PDF Descargar | [ Datasheet PT7M7809.PDF ] | |
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