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G781 Datasheet(PDF) 3 Page - List of Unclassifed Manufacturers |
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G781 Datasheet(HTML) 3 Page - List of Unclassifed Manufacturers |
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Ver: 1.0 Oct 02, 2002 TEL: 886-3-5788833 http://www.gmt.com.tw 3 Global Mixed-mode Technology Inc. G781 Electrical Characteristics (continued) (VCC = + 3.3V, TA = 0 to +85°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS SMBus Interface Logic Input High Voltage STBY , SMBCLK, SMBDATA; Vcc = 3V to 5.5V 2.4 V Logic Input Low Voltage STBY , SMBCLK, SMBDATA; Vcc = 3V to 5.5V 0.8 V Logic Output Low Sink Current ALERT , SMBDATA forced to 0.4V 6 mA ALERT Output High Leakage Current ALERT forced to 5.5V 1 µA Logic Input Current Logic inputs forced to VCC or GND -2 2 µA SMBus Input Capacitance SMBCLK, SMBDATA 5 pF SMBus Clock Frequency 100 kHz SMBus Timeout SMBCLK low time for interface reset 30 ms SMBCLK Clock Low Time tLOW , 10% to 10% points 4.7 µs SMBCLK Clock High Time tHIGH , 90% to 90% points 4 µs SMBus Start-Condition Setup Time 4.7 µs SMBus Repeated Start-Condition Setup Time tSU : STA , 90% to 90% points 500 ns SMBus Start-Condition Hold Time tHD: STA , 10% of SMBDATA to 90% of SMBCLK 4 µs SMBus Stop-Condition Setup Time tSD: STO , 90% of SMBCLK to 10% of SMBDATA 4 µs SMBus Data Valid to SMBCLK Rising-Edge Time tSU: DAT , 10% or 90% of SMBDATA to 10% of SMBCLK 800 ns SMBus Data-Hold Time tHD : DAT 300 ns SMBCLK Falling Edge to SMBus Data-Valid Time Master clocking in data 1 µs Note 1: A remote diode is any diode-connected transistor from Table1. TR is the junction temperature of the remote of the remote diode. See Remote Diode Selection for remote diode forward voltage requirements. Note 2: Guaranteed by design but not 100% tested. Pin Description PIN NAME FUNCTION 1 VCC Supply Voltage Input, 3V to 5.5V. Bypass to GND with a 0.1µF capacitor. 2 DXP Combined Current Source and A/D Positive Input for remote-diode channel. Do not leave DXP float- ing; tie DXP to DXN if no remote diode is used. Place a 2200pF capacitor between DXP and DXN for noise filtering. 3 DXN Combined Current Sink and A/D Negative Input. 4 THERM Open-drain output. Requires pull-up to VCC. 5 GND Ground 6 ALERT SMBus Alert (interrupt) Output, open drain 7 SMBDATA SMBus Serial-Data Input / Output, open drain 8 SMBCLK SMBus Serial-Clock Input |
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