ne56605-42 NXP Semiconductors, ne56605-42 Datasheet
ne56605-42
Related parts for ne56605-42
ne56605-42 Summary of contents
Page 1
... NE56605-42 System reset with built-in watchdog timer Product data Supersedes data of 2001 Aug 22 INTEGRATED CIRCUITS 2003 Oct 15 ...
Page 2
... Philips Semiconductors System reset with built-in watchdog timer GENERAL DESCRIPTION The NE56605-42 is designed to generate a reset signal 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 NE56605-42 has a built-in Watchdog Timer to monitor the microprocessor and ensure it is operating properly ...
Page 3
... Storage temperature stg P Power dissipation 2003 Oct 15 PIN CONFIGURATION DESCRIPTION , t adjustment pin times are dependent on the value of external times. WDM WDR PR PARAMETER 3 Product data NE56605-42 TOP VIEW RESET T RESET CLK GND SL01279 Figure 2 ...
Page 4
... open RESET 1 open during CT C watchdog operation during power-on reset operation V = 0.4 V; RESET RESET current = 0 – 0.1 V; RESET resistor (pin 2 to GND) 4 Product data NE56605-42 MIN. TYP. MAX. UNIT – 0.7 1.0 mA 4.05 4.20 4.35 V 4.15 4.30 4.45 V – 0.01 – 100 150 mV 0.8 1 ...
Page 5
... C = 100 RESET exceeds the upper detection threshold ( and power-on reset delay time (t WDR , t , and t values: PR WDM WDR ( Product data NE56605-42 MIN. TYP. MAX. UNIT 5.0 V 8.0 – – s 3.0 – – – – 1.0 2 ...
Page 6
... Figure 6. Detection threshold versus temperature. 600 RESET PULL- 2.2 k 500 400 T amb 300 200 100 T = –25 C amb 0 –1.4 –1.6 –1.8 0 –2 SL01300 Figure 8. RESET saturation versus sink current. 6 Product data NE56605- – amb 2.0 3.0 4.0 5.0 6.0 7.0 8 POWER SUPPLY VOLTAGE (V) CC SL01304 ) ...
Page 7
... Open CT 120 100 100 –40 –20 SL01296 Figure 12. Watchdog monitoring time versus temperature 100 SL01294 7 Product data NE56605-42 –4.0 –6.0 –8.0 –10 –12 –14 –16 , RESET HIGH OUTPUT LEAKAGE CURRENT ( A) SL01297 100 T , AMBIENT TEMPERATURE ( C) amb SL01295 ...
Page 8
... C , CAPACITANCE ( F) T Figure 16. Watchdog reset time versus C 2003 Oct 5 amb 10 1.0 –1 10 –2 10 –3 1 SL01290 . Figure 15. Watchdog reset time versus C T 1.0 10 SL01292 . T 8 Product data NE56605-42 –2 – 1 CAPACITANCE ( F) T SL01291 . T ...
Page 9
... If the microprocessor clock signal ceases or becomes erratic, the NE56605-42 outputs a reset signal to the microprocessor. If the microprocessor supply voltage sags to 4.2 volts or less, the NE56605-42 outputs a reset signal for the duration of the supply voltage deficiency. The undervoltage reset signal allows the microprocessor to shut down in an orderly manner to avoid system corruption ...
Page 10
... decays even further, RESET also decreases to zero WDM WDR TIME Figure 18. Timing diagram. 10 Product data NE56605-42 causes the RESET signal CC is within normal T continues reaches the T starts falling, CC undervoltage SL ...
Page 11
... RESET 4.9 CLK 4.8 RESET 4.7 4.6 GND 4.5 4.4 4.3 0 100 200 R , EXTERNAL PIN 7 TO GROUND RESISTOR ( SL01287 Figure 22. Reset detection threshold versus external R 11 Product data NE56605- shown in Figure 19. See CC to use use 300 400 500 600 700 RESISTOR ( SL01289 . 5.0 V ...
Page 12
... HIGH state when I CLK value when V (observed on CRT ) transitions to an abrupt LOW state. The value when V (observed on CRT ) starts to track the Product data NE56605- Read CLK CT RESET RESET 5 – – 3.0 V 3.0 V – – ...
Page 13
... V A – 5 – 5 – 5 – 5 – 5 – 5 – 5 – 5 Product data NE56605- CRT CLKA CLK – – – – 5 – ...
Page 14
... Philips Semiconductors System reset with built-in watchdog timer PACKING METHOD The NE56605-42 is packed in reels, as shown in Figure 25. GUARD TAPE BAND BARCODE LABEL BOX 2003 Oct 15 REEL ASSEMBLY Figure 25. Tape and reel packing method 14 Product data NE56605-42 TAPE DETAIL COVER TAPE CARRIER TAPE ...
Page 15
... Philips Semiconductors System reset with built-in watchdog timer SO8: plastic small outline package; 8 leads; body width 3.9 mm 2003 Oct 15 15 Product data NE56605-42 SOP005 ...
Page 16
... Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Fax: + 24825 Document order number: 16 Product data NE56605-42 Koninklijke Philips Electronics N.V. 2003 All rights reserved. Printed in U.S.A. Date of release: 10-03 9397 750 12123 ...