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TUSB2077A Datasheet(PDF) 12 Page - Texas Instruments |
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TUSB2077A Datasheet(HTML) 12 Page - Texas Instruments |
12 / 16 page TUSB2077A 7-PORT HUB FOR THE UNIVERSAL SERIAL BUS WITH OPTIONAL SERIAL EEPROM INTERFACE SLLS414 – MARCH 2000 12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION bus-powered hub, ganged port power management When used in bus-powered mode, the TUSB2077A supports up to four downstream ports by controlling a TPS2041 device which is capable of supplying 100 mA of current to each downstream port. Bus-powered hubs must implement power switching to ensure current demand is held below 100 mA when the hub is hot-plugged into the system. Utliizing the TPS2041 for ganged power management provides over-current protection for the downstream ports. The SN75240 transient suppressors reduce inrush current and voltage spikes on the data lines. The OVRCUR signals should be tied together for a ganged operation. † TPS2041 and SN75240 are Texas Instruments devices. ‡ 120 µF per hub is the minimum required per the USB specification, version 1.1. However, TI recommends a 100 µF low ESR tantulum capacitor per port for immunity to voltage droop. § LDO is a 5 V to 3.3 V voltage regulator. TPS76333 from Texas Instruments can be used. DP1 DM1 DP2 DM2 DP3 DM3 DP4 PWRON1 PWRON2 PWRON3 PWRON4 OVRCUR1 OVRCUR2 OVRCUR3 OVRCUR4 DM4 DP0 DM0 VCC XTAL1 XTAL2 EXTMEM RESET SN75240† EN IN OC OUT D + D – 5 V GND D + D – 5 V D + D – 5 V D + D – 5 V Downstream Ports TUSB2077A TPS2041† A B C D 100 µF‡ SN75240† A B C D GND GND GND 1 µF 100 µF‡ 100 µF‡ 100 µF‡ 5 V 3.3 V GND D + D – Upstream Port 3.3 V LDO§ SN75240† A B 5 V GND C D 4.7 µF 0.1 µF 4.7 µF GND Ferrite Beads Ferrite Beads Ferrite Beads Ferrite Beads EEDATA/GANGED 6-MHz Clock Signal BUSPWR System Power-On Reset OUT OUT IN 3.3 V 1.5 k Ω 15 k Ω 15 k Ω 15 k Ω 15 k Ω 15 k Ω 15 k Ω 15 k Ω 15 k Ω DP5–DP7 DM5–DM7 PWRON5–7 OVRCUR5–7 NC 3.3 V MODE DP0PUR Figure 9. TUSB2077A Bus-Powered Hub, Ganged Port Power Management Application |
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