mcs7717 MosChip, mcs7717 Datasheet - Page 4

• Manufacturer Part Number: mcs7717
• Description: Three Port Usb Hub With 1 Serial, 1 Printer
• Manufacturer: MosChip

Page 4
MCS7717
Three Port USB Hub with 1 Serial, 1 Printer
Pin Assignments
nUSB1PWR
TSTMODE
Pin Name
nUSB1OV
EE_CLK
TSTPLL
EE_DO
RESET
EE_CS
EE_EN
XTAL1
XTAL2
EE_DI
DM3
nCD
DP3
DM
DP
Pin
12
13
15
16
17
18
19
20
22
23
11
1
2
4
5
8
9
Type
I/O
I/O
I/O
I/O
O
O
O
O
O
I
I
I
I
I
I
I
I
Crystal Oscillator input, or External Clock input pin (6 MHz).
This signal input is used in conjunction with XTAL2 to form a
feedback circuit for the internal timing. Two (10 pF) external
capacitors connected from each side of the crystal to GND are
required to form a Crystal Oscillator.
Crystal Oscillator output. See XTAL1 description.
Test Mode (active low, internal pull-up).
When this pin is tied to GND, the internal PLL is bypassed and an
external 48 MHz clock is used as the reference clock.
Internal Test Mode (active low, internal pull-up).
When this pin is tied to GND, the Internal Test Mode is enabled.
Upstream USB port differential Data Minus (D-), analog.
Upstream USB port differential Data Plus (D+), analog.
Over-Current signal from external power management circuit for
USB expansion Port-1. This signal indicates that this external
circuit has sensed an Over-Current condition.
Power-On signal to external power management circuit for USB
expansion Port-1. This is a signal to apply power to the interface.
In the presence of an Over-Current sense, this output is driven
high (open drain output, 6 mA max). It can be used as a status
indicator, connected to an LED through a 330Ω resistor.
System Reset (active high).
Resets all internal registers, sequencers, and signals to a
consistent state. Connect to GND to use the internal Power-On-
Reset circuit.
External EEPROM serial data input.
External EEPROM serial data output.
External EEPROM clock.
External EEPROM chip select. After Power-On Reset, the
chip reads the EEPROM and loads the read-only configuration
registers sequentially from the first 64 Bytes in the EEPROM.
Enable/Disable external EEPROM (internal pull-up). External
EEPROM can be enabled when this pin is tied to GND or pulled
low. When external EEPROM is disabled, the default values for
the chip will be loaded into the configuration register.
Carrier-Detect signal.
When low, this indicates that the modem or data set has detected
the Data Carrier. nCD has no effect on the transmitter.
Downstream USB Port-3 differential Data Minus (D-)
Downstream USB Port-3 differential Data Plus (D+)
Description
Rev. 1.7