PT7M7809STEX Pericom Semiconductor, PT7M7809STEX Datasheet - Page 2

• Manufacturer Part Number: PT7M7809STEX
• Description: IC SUPERVISOR 2.93V SOT23-3
• Manufacturer: Pericom Semiconductor
• Type: Simple Reset/Power-On Resetr

Specifications of PT7M7809STEX

• Number Of Voltages Monitored: 1
• Output: Push-Pull, Totem Pole
• Reset: Active Low
• Reset Timeout: 140 ms Minimum
• Voltage - Threshold: 2.93V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PT7M7809STEXTR

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Pin Configuration
Pin Description
Functional Description
Reset Output
A microprocessor (µP) reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in
reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout
conditions.
On power-up, once Vcc reaches about 1.0V, /RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, /RESET stays low.
When Vcc rises above the reset threshold, an internal timer releases /RESET after about 200ms. /RESET pulses low whenever
Vcc drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse,
the pulse continues for at least another 200ms. On power-down, once Vcc falls below the reset threshold, /RESET stays low and is
guaranteed to be 0.4V or less until Vcc drops below 1.0V. Reset Timing Diagram shows the timing relationship.
PT0249(08/09)
RESET
GND
VCC
Pin
Type
O
-
-
Supply Voltage. Reset is asserted when V
remains asserted until V
Period (t
Ground
Active-Low Reset Output (Push-Pull). It goes low when Vcc is below the reset threshold. It remains
low for about 200ms after Vcc rises above the reset threshold (V
RS
) once V
CC
Description
rises above V
CC
rises above V
1
2
RST
PT7M7803/09/10XT
GND
RESET
.
SOT23-3
RST
2
CC
and keep asserted for the duration of the Reset Timeout
drops below the Reset Threshold Voltage (V
VCC
3
RST
).
µP Supervisor Circuits
PT7M7803/09/10
Data Sheet
RST
). Reset
Ver: 8