NJU7291 Datasheet, PDF (1/10 Pages) New Japan Radio – SYSTEM RESET IC WITH WATCHDOG TIMER

NJU7291
SYSTEM RESET IC WITH WATCHDOG TIMER
■ GENERAL DESCRIPTION
■ PACKAGE OUTLINE
The NJU7291 is a system reset IC with watchdog timer. It
can detect an instantaneous voltage drop and break, and
generates a reset signal. The NJU7291 provides a fail-safe
function with an internal watchdog timer on various
microcomputer systems. It is available in 8-lead DIP and
MSOP (TVSP) packages.
NJU7291RB1
(MSOP8 (TVSP8))
NJU7291D
(DIP8)
■ FEATURES
● Supply Voltage Range
: V⁺ = 2.5 V to 7.0 V
● RESET Detection Voltage : V_RL = ± 1.0 % and Adjustable Detection Voltage with External Resistance
● Rising RESET Hold Time and Watchdog Timer RESET Time Setting Ratio = 30 : 1
● Configurable Watchdog Timer Watching Time Independent Setting
● Configurable Stopping Watchdog Timer Function
● Package Outline
: MSOP8 (TVSP8)*, DIP8
*MEET JEDEC MO-187-DA / THIN TYPE
■ PIN CONFIGRATION / PIN FUNCTION
PIN No. PIN NAME
FUNCTION
1.
CR External Capacitor Pin for Setting Reset Pin
1
8
2.
CW External Capacitor Pin for Clock Pin
2
7
3.
CK Clock Input Pin
4.
GND Ground Pin
3
6
5.
V⁺
Power Supply Pin
4
5
6.
WDEN External Register Pin for Setting Watchdog Timer Pin
7.
RSADJ External Register Pin for Setting Reset Pin
8.
RESET Reset Signal Output Pin
■ BLOCK DIAGRAM
RD1
RSADJ ₇
RD2
RD3
V⁺
5
REG
VREF
CR
Control
V⁺
CK ₃
100kΩ
4
GND
CW
Control
100kΩ
6
WDEN
Ver.2013-08-28
8 ^RESET
V⁺
CR
1
V⁺
C_R
CW
2
CW
-1-