mcs7717 MosChip, mcs7717 Datasheet - Page 5

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

Rev. 1.7
nUSB3PWR
Pin Name
nUSB3OV
nSLCTIN
nDSR
BUSY
nACK
nRTS
SLCT
DM1
PD7
PD6
PD5
DP1
PD4
PD3
PD2
RX
PE
TX
Pin
24
25
26
28
29
30
31
32
33
34
35
36
37
39
40
42
43
44
45
Type
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
O
I
I
I
I
I
I
I
Data-Set-Ready signal.
When low, this indicates the modem or data set is ready to
establish a communication link.
UART Serial Data Input.
Request-To-Send signal.
It is set high (inactive) after a hardware reset or during internal
loop-back mode. When low, this indicates that the UART is ready
to exchange data. nRTS has no effect on the transmitter or
receiver.
Power-On signal to external power management circuit for USB
expansion Port-3. 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.
Over-Current signal from external power management circuit for
USB expansion Port-3. This signal indicates that this external
circuit has sensed an Over-Current condition.
Peripheral/Printer Selected (internal pull-up).
This pin is set high by the peripheral/printer when it is selected.
Paper Empty (internal pull-up).
This pin is set high by the peripheral/printer when printer paper is
empty.
Peripheral/Printer Busy (internal pull-up).
This pin is set high by the peripheral/printer when the printer or
peripheral is not ready to accept data.
Peripheral/Printer data Acknowledge (internal pull-up).
This pin is set low by the peripheral/printer to indicate a successful
data transfer has taken place.
Parallel printer port Data bit 7.
Parallel printer port Data bit 6.
UART Serial Data Output.
Parallel printer port Data bit 5.
Downstream USB Port-1 differential Data Plus (D+)
Downstream USB Port-1 differential Data Minus (D-)
Parallel printer port Data bit 4.
Parallel printer port Data bit 3.
Peripheral/Printer Select (open-drain).
Selects the peripheral/printer when it is set low.
Parallel printer port Data bit 2.
Three Port USB Hub with 1 Serial, 1 Printer
Description
MCS7717
Page 5