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TUSB2046B/B1
Universal Serial Bus (USB) Version 1.1
Compliant
≤
32-Pin LQFP
Package With a 0.8 mm Pin
Pitch
3.3-V Low Power ASIC Logic
Integrated USB Transceivers
State Machine Implementation Requires No
Firmware Programming
One Upstream Port and Four Downstream
Ports
All Downstream Ports Support Full-Speed
and Low-Speed Operations
Two Power Source Modes
± Self-Powered Mode
± Bus-Powered Mode
Power Switching and Over-current
Reporting Is Provided Ganged or Per Port
Supports Suspend and Resume Operations
Supports Programmable Vendor ID and
Product ID With External Serial EEPROM
3-State EEPROM Interface Allows EEPROM
Sharing
Push-Pull Outputs for PWRON Eliminate
the Need for External Pullup Resistors
Noise Filtering on OVRCUR Provides
Immunity to Voltage Spikes
Package Pinout Allows 2-Layer PCB
Low EMI Emission Achieved by a 6-MHz
Crystal Input
Migrated From Proven TUSB2040 Hub
Lower Cost Than the TUSB2040 Hub
Enhanced System ESD Performance
Supports 6 MHz Operation Through a
Crystal Input or a 48 MHz Input Clock
description
The TUSB2046B is a 3.3-V CMOS hub device that provides one upstream port and four downstream ports in
compliance with the 1.1 Universal Serial Bus (USB) specification. Because this device is implemented with a
digital state machine instead of a microcontroller, no firmware programming is required. Fully compliant USB
transceivers are integrated into the ASIC for all upstream and downstream ports. The downstream ports support
both full-speed and low-speed devices by automatically setting the slew rate according to the speed of the
device attached to the ports. The configuration of the BUSPWR pin selects either the bus-powered or the
self-powered mode.
32
31 30 29 28 27
DP0
1
DM0
2
V
3
CC
4
RESET
5
EECLK
EEDATA/GANGED
6
GND
7
BUSPWR
8
9 10
--18--
VF PACKAGE
(TOP VIEW)
26
25
24
DP4
23
DM4
22
OVRCUR4
21
PWRON4
20
DP3
19
DM3
18
OVRCUR3
17
PWRON3
11 12 13 14 15 16
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