ne56625-20 NXP Semiconductors, ne56625-20 Datasheet - Page 2

• Manufacturer Part Number: ne56625-20
• Description: Ne56625-20 System Reset With Watchdog Timer
• Manufacturer: NXP Semiconductors

applications with low battery detection threshold at 2.2 V. It is offered
Philips Semiconductors
GENERAL DESCRIPTION
The NE56625-20 is comprised of a power-on reset, a Watchdog
timer and low battery detection circuit. The NE56625 is designed to
generate an Active-LOW reset signal for a variety of microprocessor
and logic systems. Accurate reset signals are generated during
momentary power interruptions or whenever power supply voltages
sag to intolerable levels. The built-in Watchdog timer monitors the
microprocessor and ensures it is operating properly. Any abnormal
system operations due to microprocessor malfunctions are
terminated by a system reset generated by the Watchdog. To
accommodate a wide range of system requirements, the Watchdog
Monitoring Time and power-on reset delay time are programmable
from 10 ms to 10 sec.
The NE56625-20 is designed for low voltage battery powered
in the 8-lead small outline surface mount package (SOP005).
FEATURES
SIMPLIFIED SYSTEM DIAGRAM
2003 Oct 15
Accurate threshold detection voltages:
– Low battery: 2.2 V 3%
– Power-on reset: 2.0 V 3%
Low hysteresis voltage (both low battery check and power-on
reset): 50 mV typ.
Low supply current: 150 A typ.
Programmable power-on reset detection voltage
Programmable power-on reset delay: 10 ms to 10 s
Internal Watchdog timer programmable with external resistor and
capacitor: 10 ms to 10 s
Reset assertion with V
Few external components required
System reset with Watchdog timer
C
CC
down to 0.8 V
V
S
7
V
5
CC
NE56625-20
V
REF
DC
4
(typical)
R
CT
GND
Figure 1. Simplified system diagram.
PROGRAMMABLE
6
WATCHDOG
R
GENERATOR
TIMER
CT
BATTERY
CHECK
RESET
1
C
T
2
APPLICATIONS
Microcomputer systems and logic systems
2 V cordless phones
Various portable, battery operated equipment
2
3
8
CLK
BC
RESET
NMI
RESET
CLK
LOGIC SYSTEM
GND
SL01593
NE56625-20
Product data