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DS1232LP 데이터시트(PDF) 1 Page - Dallas Semiconductor |
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DS1232LP 데이터시트(HTML) 1 Page - Dallas Semiconductor |
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1 / 7 page ![]() DS1232LP/LPS Low Power MicroMonitor Chip DS1232LP/LPS 062698 1/7 FEATURES • Super low-power version of DS1232 • 50 mA quiescent current • Halts and restarts an out–of–control microprocessor • Automatically restarts microprocessor after power failure • Monitors pushbutton for external override • Accurate 5% or 10% microprocessor power supply monitoring • 8–pin DIP, 8–pin SOIC or space saving µ–SOP pack- age available • Optional 16–pin SOIC package available • Industrialtemperature–40°Cto+85°Cavailable,des- ignated N PIN ASSIGNMENT 1 2 3 4 8 7 6 5 VCC ST RST RST PBRST TD TOL GND DS1232LP 8–Pin DIP (300 Mil) See Mech. Drawings Section DS1232LPS 16–Pin SOIC (300 Mil) See Mech. Drawings Section 1 2 3 4 5 6 7 8 TD TOL GND PBRST VCC ST RST RST DS1232LPS–2 8–Pin SOIC (150 Mil) See Mech. Drawings Section NC PBRST NC TD NC TOL NC GND NC VCC NC ST NC RST NC RST 1 11 12 13 14 2 3 4 5 6 7 8 9 10 15 16 DS1232LP µ (118 MIL µ–SOP) See Mech. Drawings Section VCC ST RST RST 8 7 6 5 1 2 3 4 PBRST TD TOL GND PIN DESCRIPTION PBRST – Pushbutton Reset Input TD – Time Delay Set TOL – Selects 5% or 10% VCC Detect GND – Ground RST – Reset Output (Active High) RST – Reset Output (Active Low, open drain) ST – Strobe Input VCC – +5 Volt Power DESCRIPTION The DS1232LP/LPS Low Power MicroMonitor Chip monitors three vital conditions for a microprocessor: power supply, software execution, and external over- ride. First, a precision temperature–compensated refer- ence and comparator circuit monitors the status of VCC. When an out–of–tolerance condition occurs, an internal power fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condi- tion, the reset signals are kept in the active state for a minimum of 250 ms to allow the power supply and pro- cessor to stabilize. The second function the DS1232LP/LPS performs is pushbutton reset control. The DS1232LP/LPS de- bounces the pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third function is a watchdog timer. The DS1232LP/LPS has an inter- nal timer that forces the reset signals to the active state if |
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