TUSB2077A_17 Datasheet, PDF (9/26 Pages) Texas Instruments – 7-Port Hub for the Universal Serial Bus With Optional Serial EEPROM Interface

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8 Detailed Description
TUSB2077A
SLLS414F – MARCH 2000 – REVISED AUGUST 2015
8.1 Overview
The TUSB2077A hub is a 3.3-V CMOS device that provides up to seven downstream ports in compliance with
the USB 2.0 specification. Because this device is implemented with a digital state machine instead of a
microcontroller, no software programming is required. Fully compliant USB transceivers are integrated into the
ASIC for all upstream and downstream ports. The downstream ports support full-speed and low-speed devices
by automatically setting the slew rate according to the speed of the device attached to the ports.
8.2 Functional Block Diagram
DP0
DM0
3
4
USB
Transceiver
Hub Repeater
Suspend /Resume
Logic and
Frame Timer
1
SUSPND
1
M
U
X
0
OSC/PLL
45
XTAL1/CLK48
44
SIE
XTAL2
48
MODE
6
RESET
2 _DP0PUR
47 _EXTMEM
Port 4
Logic
Port 1
Logic
SIE Interface
Logic
Serial
EEPROM
Interface
Hub /Device
Command
Decoder
8 _{EEDATA/GANGED}
7 _EECLK
40 _HUBCFG
42 _PORTDIS
41 _PORTPWR
10 _BUSPWR
USB
Transceiver
39 38
DP7 DM7
USB
Transceiver
14 13
DP1 DM1
Hub
Power
Logic
12, 16, 20, 25, 29, 33, 37
11, 15, 19, 23,28, 32, 36
OVRCUR1 - OVRCUR7
PWRON1 - PWRON7
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Product Folder Links: TUSB2077A
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