asm1815-5ft Alliance Memory, Inc, asm1815-5ft Datasheet - Page 3

• Manufacturer Part Number: asm1815-5ft
• Description: Power, 3.3v/3.0v Reset Active Push-pull Output
• Manufacturer: Alliance Memory, Inc

February 2005
rev 1.4
Figure 1: Timing Diagram: Power-Up
Application Information
Operation - Power Monitor
The ASM1815 detects out-of-tolerance power supply
conditions. It resets a processor during power-up, power-
down and issues a reset to the system processor when the
monitored power supply voltage is below the reset threshold.
When an out-of-tolerance V
RESET signal is asserted. On power-up, RESET is kept
active (LOW) for approximatley 150ms after the power supply
voltage has reached the selected tolerance. This allows the
power supply and microprocessor to stablize before RESET
is released.
RESET
V
CC
V
CCTP
(MIN)
CC
t
R
Notice: The information in this document is subject to change without notice
voltage is detected, the
V
CCTP
V
t
RPU
CCTP
(MAX)
Low Power, 3.3V/3.0V µP Reset
V
OH
RESET
Output Conditions
The ASM1815 active LOW reset signal is valid as long as
V
ASM1815 uses a push-pull drive stage that can maintain a
valid output below 1.2V. To sink current with V
a resistor can be connected from the reset pin (RESET) to
Ground (see Figure 3). This configuration will give a valid
value on the RESET output with V
both power up and down, this configuration will draw current
when the RESET is in the high state. A value of 100kΩ
should be adequate to maintain a valid connection.
V
CC
CC
Figure 2: Timing Diagram: Power-Down
Figure 3: RESET Valid to 0V V
remains below 1.2V. The RESET output on the
ASM1815
RESET
V
CCTP
(MAX)
V
CCTP
100kΩ
t
CC
F
V
t
approaching 0V. During
OL
RPD
Microprocessor
RESET
CC
V
CCTP
ASM1815
CC
(MIN)
below 1.2V,
3 of 9