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Details, datasheet, quote on part number:NE56604-42D
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Datasheet text preview:
INTEGRATED CIRCUITS
NE56604-42 System reset with built-in watchdog timer
Product data Supersedes data of 2001 Jun 19 File under Integrated Circuits, Standard Analog 2001 Aug 22
Philips Semiconductors
Philips Semiconductors
Product data
System reset with built-in watchdog timer
NE56604-42
GENERAL DESCRIPTION
The NE56604-42 is designed to generate a reset signal at a threshold voltage of 4.2 V 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 NE56604-42 has a built-in Watchdog Timer to monitor the microprocessor and ensure it is operating properly. Any abnormal system operations due to microprocessor malfunctions are terminated by a system reset generated by the watchdog. The NE56604-42 has a watchdog monitoring time of 100 ms (typical). The NE56604-42 is offered in the SO8 surface mount package.
FEATURES
· Both positive and negative logic reset output signals are available · Accurate threshold detection · Internal power-on reset delay · Internal watchdog timer programmable with external resistor · Watchdog monitoring time of 100 ms (typical) · Reset assertion with VCC down to 0.8 VDC (typical) · Few external components required.
APPLICATIONS
· Microcomputer systems · Logic systems.
SIMPLIFIED SYSTEM DIAGRAM
VCC R CT 5 6 R CT
R VS 7
NE56604-42
8 RESET GENERATOR 2 RESET
LOGIC SYSTEM RESET
RESET CLK
RESET CLK GND
R C
V REF PROGRAMMABLE WATCHDOG TIMER 3
4 GND
1 CT
SL01281
Figure 1. Simplified system diagram.
ORDERING INFORMATION
PACKAGE TYPE NUMBER NUMBER NE56604-42D 2001 Aug 22 NAME SO8 DESCRIPTION plastic small outline package; 8 leads; body width 3.9 mm 2 TEMPERATURE RANGE 20 to +70 °C 8532250 26949
Philips Semiconductors
Product data
System reset with built-in watchdog timer
NE56604-42
Part number marking
The package is marked with a four letter code in the first line to the right of the logo. The first three letters designate the product. The fourth letter, represented by `x', is a date tracking code. The remaining two or three lines of characters are internal manufacturing codes.
PIN CONFIGURATION
TOP VIEW CT RESET CLK GND 7 6 1 2 8 7 RESET VS R CT VCC
SO8
3 4 6 5
8
5
SL01280
Figure 2. Pin configuration.
1
2
3
Part number NE56604-42
Marking AA D x
PIN DESCRIPTION
PIN 1 CT SYMBOL DESCRIPTION tWDM, tWDR, tPR adjustment pin. tWDM, tWDR, tPR times are dependent on the value of external CT capacitor used. See Figure 20 (Timing Diagram) for definition of tWDM, tWDR, tPR times. Reset HIGH output pin. Clock input pin from logic system for watchdog timer. Circuit ground. Power supply pin for circuit. Watchdog timer control and program pin. Serves to ENABLE the watchdog function when connected to pull-up resistor (RCT) to VCC, and DISABLE the watchdog when connected to ground. Used in conjunction with CT pin to program tWDM time. Detection threshold adjustment pin. The detection threshold can be increased by connecting this pin to VCC with a pull-up resistor. The detection threshold can be decreased by connecting this pin to ground with a pull-down resistor. Reset LOW output pin.
2 3 4 5 6
RESET CLK GND VCC RC T
7
VS
8
RESET
MAXIMUM RATINGS
SYMBOL VCC VVS VCLK VOH Toper Tstg P Power supply voltage VS pin voltage CLK pin voltage RESET and RESET pin voltage Operating temperature Storage temperature Power dissipation PARAMETER MIN. 0.3 0.3 0.3 0.3 20 40 MAX. 10 10 10 10 70 125 250 UNIT V V V V °C °C mW
4
2001 Aug 22
3
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