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G684L400T1U Datasheet(PDF) 5 Page - Global Mixed-mode Technology Inc |
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G684L400T1U Datasheet(HTML) 5 Page - Global Mixed-mode Technology Inc |
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5 / 7 page  Ver: 1.2 Jun 03, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 5 G684/G685 Global Mixed-mode Technology Inc. Pin Description PIN NAME FUNCTION 1 N.C. No Connection. 2,3 GND Ground RESET (G684L/G685L) RESET Output remains low while VCC is below the reset threshold, and for 2ms typical after VCC rises above the reset threshold. 4 RESET (G684H) RESET Output remains high while VCC is below the reset threshold, and for 2ms typical after VCC rises above the reset threshold. 5 VCC Supply Voltage (+5V, +3.3V, +3.0V) Detailed Description A microprocessor’s (µP’s) reset input starts the µP in a known state. The G685L/G684L/G684H assert reset to prevent code-execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold (VTH-), VCC has risen above the high reset threshold VTH+ (VTH-+VHYS). The G685L uses an open-drain output, and the G684L/G684H have a push-pull output stage. Connect a pull-up resistor on the G685L’s RESET output to any supply between 0 and 5.5V. Ensuring a Valid Reset Output Down to VCC = 0 When VCC falls below 0.8V, the G684 RESET output no longer sinks current—it becomes an open circuit. Therefore, high-impedance CMOS logic inputs con- nected to RESET can drift to undetermined voltages. This presents no problem in most applications since most µP and other circuitry is inoperative with VCC be- low 0.8V. However, in applications where RESET ust be valid down to 0V, adding a pull-down resistor to RESET causes any stray leakage currents to flow to ground, holding RESET low (Figure 2). R1’s value is not critical; 100k Ω is large enough not to load RESET and small enough to pull RESET to ground. A 100k Ω pull-up resistor to VCC is also recommended for the G685L if RESET is required to remain valid for VCC < 0.8V. Figure2. RESET Valid to VCC = Ground Circuit V CC RESET GND G684 R1 100k V CC RESET GND G684 R1 100k |
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