MCS7705
USB 1.1 to Single Printer Port
MosChip Semiconductor ♦ 3335 Kifer Rd, Santa Clara, CA 95051 ♦ Tel (408) 737-7141 ♦ Fax (408) 737-7708
General Description
The MCS7705 controller provides bridging between
the Universal Serial Bus (USB) port, and a Parallel
Printer port. This device contains all the necessary
logic to communicate with the host computer via
the USB Bus. It supports Printers with hardware
accelerated SPP mode.
In addition, the MCS7705 contains a 3.3V regulator
and operates in Bus-Powered mode.
The MCS7705 has a reduced frequency (6MHz)
crystal oscillator. This combination of features
allows signicant cost savings in system design
along with straightforward implementation of
Parallel Printer port functionality into PC peripherals
using the host’s USB port.
Ordering Information
Commercial Grade (0° C to +70° C)
MCS7705CQ 48-QFP Standard
MCS7705CQ-GR 48-QFP RoHS
Features
• Single 5V Operation
• Low Power
• USB Specication 1.1 compliant
• Operation over the extended USB Bus
voltage range (4.5 to 5.5V)
• On-Chip 3.3V Voltage Regulator
• Internal Power-On Reset
• Single Printer Port Interface
• 2KV In-Circuit ESD protection for lower
cost of external components
• Available in 48-Pin QFP Package
Applications
• Printer Server
• Printer Interface
Application Note
• AN-7705
Evaluation Board
• MCS7705-EVB
MCS7705
USB 1.1 to Single Printer Port
Page 2 Rev. 1.7
Block Diagram
PLL & Clock
Generator
USB
Interface
Serial
Interface
Engine
Descriptor
Table
Standard
Printer Port
FIFO
FIFO
DP
DM
XTAL1
XTAL2
TEST
TSTMODE
PD0 - PD7
nFAULT, SLCT, PE
nACK, BUSY
nSTROBE, nAUTOFDX
nINIT, nSLCTIN
MCS7705
USB 1.1 to Single Printer Port
Page 3
Rev. 1.7
Pin-out
nINIT
PD2
nSLCTIN
PD3
PD4
3.3V
GND
PD5
N.C.
PD6
PD7
nACK
5V
3.3V
XTAL1
XTAL2
GND
TSTPLL
TSTMODE
GND
DM
DP
3.3V
RESET
VOUT
GND
GND
N.C.
N.C.
3.3V
nSTROBE
nAUTOFDX
PD0
GND
nFAULT
PD1
GND
GND
N.C.
3.3V
GND
N.C.
N.C.
N.C.
GND
SLCT
PE
BUSY
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
MCS7705CQ
MCS7705
USB 1.1 to Single Printer Port
Page 4 Rev. 1.7
Pin Assignments
Pin Name Pin Type Description
XTAL1 3 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.
XTAL2 4 O Crystal Oscillator output. See XTAL1 description.
TSTPLL 6 I 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.
TSTMODE 7 I Internal Test Mode (active low, internal pull-up).
When this pin is tied to GND, the Internal Test Mode is enabled.
DM 9 I/O Upstream USB port differential Data Minus (D-), analog.
DP 10 I/O Upstream USB port differential Data Plus (D+), analog.
RESET 12 I 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.
SLCT 22 I Peripheral/Printer Selected (internal pull-up).
This pin is set high by the peripheral/printer when it is selected.
PE 23 I Paper Empty (internal pull-up).
This pin is set high by the peripheral/printer when printer paper is
empty.
BUSY 24 I 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.
nACK 25 I 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.
PD7 26 I/O Parallel printer port Data bit 7.
PD6 27 I/O Parallel printer port Data bit 6.
PD5 29 I/O Parallel printer port Data bit 5.
PD4 32 I/O Parallel printer port Data bit 4.
PD3 33 I/O Parallel printer port Data bit 3.
MCS7705
USB 1.1 to Single Printer Port
Page 5
Rev. 1.7
Pin Name Pin Type Description
nSLCTIN 34 I/O Peripheral/Printer Select (open-drain).
Selects the peripheral/printer when it is set low.
PD2 35 I/O Parallel printer port Data bit 2.
nINIT 36 I/O Initialize the peripheral/printer (open drain).
When set low, the peripheral/printer starts its initialization routine.
PD1 37 I/O Parallel printer port Data bit 1.
nFAULT 38 I Peripheral/Printer data error (internal pull-up).
This pin is set low by the peripheral/printer during an error condition.
PD0 40 I/O Parallel printer port Data bit 0.
nAUTOFDX 41 I/O Peripheral/Printer Auto Feed (open-drain).
Continuous autofed paper is selected when this pin is set low.
nSTROBE 42 I/O Peripheral/Printer data Strobe (open drain).
Data is latched into the peripheral/printer when the nSTROBE is low.
VOUT 48 PWR +3.3V Voltage Regulator output.
GND 5,8,13,46,
14, 17,21,
30, 39,47 PWR Power and Signal Ground.
3.3V 2, 11, 16,
31, 43 PWR Device Supply Inputs.
All should be connected to the VOUT pin.
VOUT voltage is gated by RESET.
5V 1 PWR Main Power Input.
Connect to USB VBUS or local VDD.
Note: All names with “n” prex are active low.
MCS7705
USB 1.1 to Single Printer Port
Page 6 Rev. 1.7
USB Description
Analog Transceivers
The on-chip transceivers are connected directly to USB cables through external series resistors. They
transmit and receive serial data at both full-speed (12Mbit/s) and low-speed (1.5Mbit/s) data rates. Slew rates
are automatically adjusted according to the speed of the device connected and lie within the range dened in
the USB Specication Rev. 1.1.
Serial Interface Engine
This engine implements the complete USB protocol layer including: parallel /serial conversion,
synchronization pattern recognition, CRC checking/generation, bit (de)stufng, packet identier (PID)
verication/generation, address recognition and handshake evaluation/generation.
Bit Clock Recovery
The bit clock recovery circuit recovers the clock from the incoming USB data stream using 4x over sampling.
It is able to track in the presence of jitter and frequency drift as specied by the USB Specication Rev. 1.1.
3.3V Source
A 5V to 3.3V DC-DC regulator is integral to the chip relieving the need for a +3.3V source. It supplies the
analog transceivers and internal logic and can be used to supply the 1.5kΩ pull-up resistor on the DP line of
the upstream connection.
PLL Clock Multiplier
An integral Phase-Locked Loop (PLL) performs 6 to 48MHz clock multiplication and requires no external
components except the crystal. This allows for the use of low-cost 6MHz crystals which reduce high
frequency radiated Electro-Magnetic Interference (EMI).
MCS7705
USB 1.1 to Single Printer Port
Page 7
Rev. 1.7
Host Requests
All standard USB requests from the host are handled via Control Endpoint-0. The Control Endpoint can
handle a maximum of 8 Bytes per transfer.
This table shows the supported standard USB requests.
Note: the USB data transmission order is Least Signicant Bit (LSB) rst. In the following tables Multi-Byte
variables are displayed least signicant Byte rst.
Standard USB Requests
RequestName bmRequestType
Byte 0 [7:0]
(bin)
bRequest
Byte 1
(hex)
wValue
Byte 2, 3
(hex)
wIndex
Byte 4, 5
(hex)
wLength
Byte 6, 7
(hex) Data
Address Set Address X000 0000 05 address** 00,00 00,00 none
Conguration
Get Conguration 1000 0000 08 00,00 00,00 01,00 Conguration Value = 0x01
Set Conguration-0 X000 0000 09 00,00 00,00 00,00 none
Set Conguration-1 X000 0000 09 01,00 00,00 00,00 none
Descriptor
Get Conguration Descriptor 1000 0000 06 00,02 00,00 length*** Conguration, Interface, and
Endpoint Descriptors
Get Device Descriptor 1000 0000 06 00,01 00,00 length*** Device Descriptor
Feature Clear Feature
(REMOTE_WAKEUP) X000 0000 01 01,00 00,00 00,00 none
Clear Endpoint (1) Feature
(HALT/STALL) X000 0010 01 00,00 81,00 00,00 none
Status
Get Device Status 1000 0000 00 00,00 00,00 02,00 Device Status
Get Interface Status 1000 0001 00 00,00 00,00 02,00 zero
Get Endpoint (0) Status 1000 0010 00 00,00 00/80, 00* 02,00 Endpoint-0 Status
Get Endpoint (1) Status 1000 0010 00 00,00 81,00 02,00 Endpoint-1 Status
* The MSB species endpoint direction: 0 = OUT, 1 = IN. Either value is accepted.
** Device Address: 0 to 127
*** Returned Value (in Bytes)
Standard USB Descriptors
These are the supported Standard USB Descriptors:
• Device
• Conguration
• Interface
• Endpoint
MCS7705
USB 1.1 to Single Printer Port
Page 8 Rev. 1.7
Device Descriptors
Offset
(Bytes) Field Name Size
(Bytes) Value
(hex) Comments
0 bLength 1 12 Descriptor Length = 18 Bytes
1 bDescriptorType 1 01 Type = DEVICE
2 bcdUSB 2 10,01 USB Specication Rev-1.1
4 bDeviceClass 1 FF Vendor Class
5 bDeviceSubClass 1 00 n/a
6 bDeviceProtocol 1 FF Vendor Class
7 bMaxPacketSize0 1 08 Packet Size = 8 Bytes
8 idVendor 2 10,97 the MosChip Vendor-ID (9710)
10 idProduct 2 05,77 the MCS7705 Product-ID
12 bcdDevice 2 00,01 the silicon revision (1.0)
14 iManufacturer 1 00 no manufacturer string
15 iProduct 1 00 no product string
16 iSerialNumber 1 00 no serial number string
17 bNumCongurations 1 01 one conguration
Conguration Descriptors
Offset
(Bytes) Field Name Size
(Bytes) Value
(hex) Comments
0 bLength 1 09 Descriptor Length = 9 Bytes
1 bDescriptorType 1 02 Type = CONFIGURATION
2 wTotalLength 2 27,00 Combined Length of Conguration,
+ Interface, + all Endpoint Descriptors
(39 Bytes)
4 bNumInterfaces 1 01 one Interface
5bConguration 1 01 Conguration Value = 1
6iConguration 1 00 no conguration string
7 bmAttributes 1 A0 Bus-Powered with remote wake-up
8 MaxPower 1 32 100mA default
Interface Descriptors
Offset
(Bytes) Field Name Size
(Bytes) Value
(hex) Comments
0 bLength 1 09 Descriptor Length = 9 Bytes
1 bDescriptorType 1 04 Type = INTERFACE
2 bInterfaceNumber 1 00 n/a
3 bAlternateSetting 1 00 no alternate setting
4 bNumEndpoints 1 03 Three Endpoints
5 bInterfaceClass 1 FF Vendor Class
6 bInterfaceSubClass 1 00 n/a
7 bInterfaceProtocol 1 FF Vendor Class
8 bInterface 1 00 no interface string
MCS7705
USB 1.1 to Single Printer Port
Page 9
Rev. 1.7
Endpoint Descriptions
There are three end points apart from the Control Endpoint
Endpoint Type Function Size
0 Control Endpoint Default Functionality
1 Bulk-In Parallel Printer Port 32Bytes
2 Bulk-Out Parallel Printer Port 32 Bytes
3 Interrupt Status Endpoint 4 Bytes
Endpoint
Descriptor #1
Bulk-In
(Parallel Port)
Offset
(Bytes) Field Name Size
(Bytes) Value
(hex) Comments
0 bLength 1 07 Descriptor Length = 7 Bytes
1 bDescriptorType 1 05 Type = ENDPOINT
2 bEndpointAddress 1 81 Endpoint-1, direction: IN
3 bmAddress 1 02 Bulk Endpoint
4 wMaxPacketSize 2 20,00 Packet Size = 32 Bytes
6 bInterval 1 FF Polling Interval (255mS)
Endpoint
Descriptor #2
Bulk-Out
(Parallel Port)
Offset
(Bytes) Field Name Size
(Bytes) Value
(hex) Comments
0 bLength 1 07 Descriptor Length = 7 Bytes
1 bDescriptorType 1 05 Type = ENDPOINT
2 bEndpointAddress 1 02 Endpoint-2, direction: OUT
3 bmAddress 1 02 Bulk Endpoint
4 wMaxPacketSize 2 20,00 Packet Size = 32 Bytes
6 bInterval 1 FF
MCS7705
USB 1.1 to Single Printer Port
Page 10 Rev. 1.7
Endpoint
Descriptor #3
Status Endpoint
Offset
(Bytes) Field Name Size
(Bytes) Value
(hex) Comments
0 bLength 1 07 Descriptor Length = 7 Bytes
1 bDescriptorType 1 05 Type = ENDPOINT
2 bEndpointAddress 1 87 Endpoint-7, direction: IN
3 bmAddress 1 03 Interrupt Endpoint
4 wMaxPacketSize 2 04,00 Packet Size = 4 Bytes
6 bInterval 1 01 Polling Interval (1mS)
Status Endpoint:
The Status Endpoint returns 4 Bytes every 1 millisecond. These four Bytes are status information of the
Parallel Printer port.
• Byte-1: Reserved (Unused)
• Byte-2: Reserved (Unused)
• Byte-3: Device Status Register of the Parallel Printer port (DSR)
• Byte-4: FIFO status of the Parallel Printer port.
Description for Byte-4 of Status Endpoint.
Bit[7] Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0]
Reserved Reserved Reserved Reserved ParOutFifo
Empty ParOutFifo
Full ParInFifo
Empty ParInFifo
Full
Bit Description
ParInFifo Full 1 Indicates the Bulk-In FIFO is full. (Parallel Printer Port)
ParInFifo Empty 1 Indicates the Bulk-In FIFO is empty. (Parallel Printer Port)
ParOutFifo Full 1 Indicates the Bulk-Out FIFO is full. (Parallel Printer Port)
ParOutFifo Empty 1 Indicates the Bulk-Out FIFO is empty. (Parallel Printer Port)
MCS7705
USB 1.1 to Single Printer Port
Page 11
Rev. 1.7
USB Vendor Specic Commands:
The purpose of the vendor commands is to congure the Parallel Printer port.
The following tables provide information for the Vendor Specic Commands.
PARALLEL PRINTER PORT
Get Application
Vendor Specic Command
(Parallel Printer Port)
BmrequestType Brequest Wvalue Windex Wlength Register Name
0xC0 0x0D 0x01xx 0x0000 0x0001 PP_DPR
0xC0 0x0D 0x01xx 0x0001 0x0001 PP_DSR
0xC0 0x0D 0x01xx 0x0002 0x0001 PP_DCR
0xC0 0x0D 0x01xx 0x0008 0x0001 PP_C_FIFO
0xC0 0x0D 0x01xx 0x0008 0x0001 PP_CONF_A
0xC0 0x0D 0x01xx 0x0009 0x0001 PP_CONF_B
0xC0 0x0D 0x01xx 0x000A 0x0001 PP_ECR
Set Application
Vendor Specic Command
(Parallel Printer Port)
BmrequestType Brequest Wvalue Windex Wlength Register Name
0x40 0x0E 0x01xx 0x0000 0x0000 PP_DPR
0x40 0x0E 0x01xx 0x0001 0x0000 PP_DSR
0x40 0x0E 0x01xx 0x0002 0x0000 PP_DCR
0x40 0x0E 0x01xx 0x0008 0x0000 PP_C_FIFO
0x40 0x0E 0x01xx 0x0008 0x0000 PP_CONF_A
0x40 0x0E 0x01xx 0x0009 0x0000 PP_CONF_B
0x40 0x0E 0x01xx 0x000A 0x0000 PP_ECR
Vendor Specic Command Parameters
Brequest: species whether to Read or Write
0x0E = write to the application register.
0x0D = read from the application register.
Wvalue: Species the Application Number.
0x0100 is the application number for the Parallel Printer port.
0x0200 is reserved.
0x0000 is the application number provided for accessing the other control registers to control the
Parallel Printer port (i.e. Setting the clock frequency, etc.)
xx species the Byte value to be written into the register.
Windex: Is the offset of the register to Read/Write.
Wlength: Is the length of the data we are going to read or write.
MCS7705
USB 1.1 to Single Printer Port
Page 12 Rev. 1.7
Parallel Printer Port Register Descriptions
Data Register
The Data Register is cleared at initialization by RESET. During a write operation, the contents of this register
are buffered and output onto the PD7-PD0 ports. During a read operation PD7-PD0 ports are buffered and
output to the host CPU.
Register: PP_DPR
Description: Parallel Printer Data Register
Offset: 000
Permissions: Read/Write
Access Condition: Application Number = 0x0100
Bit[7] Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0]
Parallel Printer Data
Device Status Register
The bits of the status register are dened as follows:
Register: DSR
Description: Device Status Register
Offset: 001
Permissions: Read
Access Condition: Application Number = 0x0100
Bit[7] Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0]
nBUSY nACK PE SLCT FAULT Unused Unused Unused
Bit Name Description
0 Unused Not used, set to 0
1 Unused Not used, set to 0
2 Unused Not used, set to 0
3 FAULT Logic 0 = Printer reports error condition
Logic 1 = Normal operation.
4 SLCT Logic 0 = Printer is off line.
Logic 1 = Printer is on line.
5 PE Logic 0 = Normal operation
Logic 1 = Paper end/empty is detected
6 nACK Logic 0 = State of the nACK pin (ACK = High).
Logic 1 = State of the nACK pin (ACK = Low).
7 nBUSY Logic 0 = nBUSY pin is high, printer is not ready to take data.
Logic 1 = nBUSY pin is low, printer is ready to take data.
MCS7705
USB 1.1 to Single Printer Port
Page 13
Rev. 1.7
Device Control Register
Register: DCR
Description: Device Control Register
Offset: 002
Permissions: Read/Write
Access Condition: Application Number = 0x0100
Bit[7] Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0]
Unused Unused DIR Unused nSLCTIN INIT nAUTOFD nSTROBE
Bit Name Description
0 nSTROBE Logic 0 = Sets the nSTROBE pin to high.
Logic 1 = Sets the nSTROBE pin to low. PD7-PD0 data are latched into
printer
1 nAUTOFD Logic 0 = Sets the nAUTOFD pin to high. Printer generates auto line feed
after each line is printed.
Logic 1 = Sets the nAUTOFD pin to low. No auto feed function.
2 INIT Logic 0 = Sets the INIT pin to high.
Logic 1 = Sets the INIT pin to low. Peripheral/printer starts its initialization
routine.
3 nSLCTIN Logic 0 = Sets the nSLCTIN pin to high. Selects the printer.
Logic 1 = Sets the nSLCTIN pin to low. Printer is not selected.
4 Unused Not uset set to 0
5 DIR Logic 0 = PD7-PD0 pins are congured for output mode.
Logic 1 = PD7-PD0 pins are congured for input mode.
6 Unused Not used, set to 0.
7 Unused Not used, set to 0.
MCS7705
USB 1.1 to Single Printer Port
Page 14 Rev. 1.7
Extended Control Register (ECR)
This register controls the Parallel Port mode selection operation.
Register: PP_ECR
Description: Parallel Printer Port Extended Control Register
Offset: 0x0A
Permissions: Read/Write
Access Condition: Application Number = 0x0100
Bit[7] Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0]
Parallel Port Mode Reserved Reserved Reserved Reserved Reserved
Bit-7 Bit-6 Bit-5 Operating Mode
0 0 0 SPP
0 0 1 Nibble
0 1 0 CB-FIFO mode
0 1 1 Not Used
1 0 0 Not Used
1 0 1 Not used
1 1 0 Not Used
1 1 1 Not Used
MCS7705
USB 1.1 to Single Printer Port
Page 15
Rev. 1.7
Mode Changes
After a hardware reset Nibble Mode is selected as the default mode. It is required to select mode 000 or 001
before any other mode conguration.
Mode “000”
SPP/Centronics/Compatible Mode
Forward direction only. The direction bit is forced to “0” and PD7-PD0 are set to the output direction. The
Parallel Port is under software control. This mode denes the protocol used by most PCs to transfer data to
a printer. It is commonly called the “Centronics” mode and is the method utilized with the Standard Parallel
Printer port. Data is placed on the PD7-PD0 ports, and the printer status is checked via the DSR register.
If no error condition is agged and the printer is not busy, software toggles the nSTROBE pin to latch the
PD7-PD0 data into the printer. This operating cycle continues when the printer/peripheral issues the data
acknowledge signal (pulses the ACK and nBUSY pins).
Mode “001”
Nibble Mode
The Nibble Mode is the most common way to get reverse channel data from the printer or peripheral.
This mode is usually combined with the SPP Mode or a proprietary forward channel mode to create a Bi-
Directional channel. In this mode printer status bits are used as Nibble bits.
Pin Data Bit
nBUSY Bit-7
PE Bit-6
SLCT Bit-5
nFAULT Bit-4
nBUSY Bit-3
PE Bit-2
SLCT Bit-1
nFAULT Bit-0
Bit Order for Nibble Mode
Mode “010”
FIFO Output Mode
In this mode, Bytes written to the FIFO are transmitted automatically using the SPP/Centronics standard
protocol.
MCS7705
USB 1.1 to Single Printer Port
Page 16 Rev. 1.7
PP_REGISTER:
This register is used for internal debugging of UDC controller & bridge circuitry. There is a bit which resets the
Parallel Printer port. There are bits which control the input clock fed to the Parallel Printer port.
Register: PP_REG
Description: Parallel Printer Port Register
Offset: 0x04
Permissions: Read/Write
Access Condition: Application Number = 0x0000
Bit[7] Bit[6] Bit[5] Bit[4] Bit[3] Bit[2] Bit[1] Bit[0]
pp_reset clk_freq_select pp_bi_clear pp_bo_clear Reserved udc_loop
Bit Description
udc_loop When enabled, loops the data from the Bulk-Out FIFO to the Bulk-In FIFO.
Reserved Reserved
pp_bo_clear Reset the Bulk-Out FIFO
pp_bi_clear Reset the Bulk-In FIFO
clk_freq_select Changes the clock fed to the Parallel Printer port.
pp_reset Resets the Parallel Printer port
pp reset: This bit will reset the Parallel Printer port.
When this bit is a 1 the Parallel Printer port is under
the Reset process. Whenever the frequency is to
be changed, rst set the Reset bit, change the clk_
frequency, and nally clear the Reset bit to 0.
clk_freq_select: Changes the clock fed to the
Parallel Printer port as shown in the table below.
Option Input Clock Frequency
3’b000 12 MHz
3’b001 6 MHz
3’b010 3 MHz
3’b011 1.5 MHz
3’b100 0.75 MHz
MCS7705
USB 1.1 to Single Printer Port
Page 17
Rev. 1.7
Electrical Characteristics
Absolute Maximum Ratings
Supply Voltage 6 Volts
Input Voltage (I/O) -0.3 to VCC +0.3
Storage Temperature -60° C to +150° C
Recommended Operating Conditions
Supply Voltage 4.5 to 5.5 Volts
Input Voltage (I/O) 0 to 5.5 Volts
Ambient Operating Temperature (free air) 0° C to +70° C
Junction Operating Temperature 0° C to +115° C
Static Characteristics (Supply Pins)
VCC = 4.5V to 5.5V; GND = 0V; Temp = 0 to +70° C; unless otherwise specied
Symbol Parameter Conditions Min Typical Max Unit
Vreg (3.3V) Regulated Supply Voltage 3.0 3.3 3.6 V
ICC Operating Supply Current - 18 - mA
Static Characteristics
VCC = 4.5V to 5.5V; GND = 0V; Temp = 0 to +70° C; unless otherwise specied
Symbol Parameter Conditions Min Typical Max Unit
VIL LOW Level Input Voltage - - 0.3*Vcc V
VIH HIGH Level Input Voltage 0.7*Vcc - - V
Vth(LH) Positive going Threshold Voltage - 3.22 - V
Vth(HL) Negative going Threshold Voltage - 1.84 - V
ILI Input Leakage Current - - ±1 µA
IOZ Tri-State Leakage Current - - ±10 µA
VOL Output Voltage (Low ) - - 0.4 V
VOH Output Voltage (High ) 3.5 - - V
Dynamic Characteristics – Analog I/O Pins (DP, DM); Full-Speed Mode
VCC = 4.5V to 5.5V; GND = 0V; Temp = 0 to +70° C; unless otherwise specied
Symbol Parameter Condition Min Typical Max Unit
TFR Rise Time CL = 50pF
10% to 90% of |VOH - VOL|4 - 20 nS
TFF Fall Time CL = 50pF
10% to 90% of |VOH - VOL|4 - 20 nS
MCS7705
USB 1.1 to Single Printer Port
Page 18 Rev. 1.7
E
HE
D
HD
e
b
A2
A1
L
c
1
12
13 24
36
48
25
37
SYMBOL MILLIMETERS INCHES
MIN TYPICAL MAX MIN TYPICAL MAX
A1 0.05 0.15 0.002 0.006
A2 1.35 1.45 0.053 0.057
b0.17 0.27 0.007 0.011
c0.09 0.20 0.004 0.008
e0.50 0.0197
L0.45 0.75 0.018 0.030
HD 8.80 9.20 0.346 0.362
D7.20 6.80 0.283 0.268
HE 8.80 9.20 0.346 0.362
E7.20 6.80 0.2.83 0.268
48-Pin QFP
Package Dimensions
MCS7705
USB 1.1 to Single Printer Port
Page 19
Rev. 1.7
IMPORTANT NOTICE
MosChip Semiconductor Technology, LTD products are not authorized for use as critical components in life
support devices or systems. Life support devices are applications that may involve potential risks of death,
personal injury or severe property or environmental damages. These critical components are semiconductor
products whose failure to perform can be reasonably expected to cause the failure of the life support systems
or device, or to adversely impact its effectiveness or safety. The use of MosChip Semiconductor Technology
LTD’s products in such devices or systems is done so fully at the customer risk and liability.
As in all designs and applications it is recommended that the customer apply sufcient safeguards and guard
bands in both the design and operating parameters. MosChip Semiconductor Technology LTD assumes no
liability for customer’s applications assistance or for any customer’s product design(s) that use MosChip
Semiconductor Technology, LTD’s products.
MosChip Semiconductor Technology, LTD warrants the performance of its products to the current specications
in effect at the time of sale per MosChip Semiconductor Technology, LTD standard limited warranty. MosChip
Semiconductor Technology, LTD imposes testing and quality control processes that it deems necessary to
support this warranty. The customer should be aware that not all parameters are 100% tested for each device.
Sufcient testing is done to ensure product reliability in accordance with MosChip Semiconductor Technology
LTD’s warranty.
MosChip Semiconductor Technology, LTD believes the information in this document to be accurate and reliable
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The information contained herein is subject to change without notice and no responsibility is assumed by
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MCS7705
USB 1.1 to Single Printer Port
Page 20 Rev. 1.7
Revision History
Revision Changes Date
1.0 Preliminary Release 6-Nov-2002
1.1 Datasheet updated for Printer Port related details 7-Feb-2005
1.2 Revised Data Sheet 25-Oct-2005
1.3 Minor Layout Changes 17-Nov-2005
1.4 Changes to Printer Port Section 29-Nov-2005
1.5 Corrected Polling Intervals 30-Nov-2005
1.6
1.7 Corrected Electrical Characteristics and pin names
Pin No: 46 description corrected in data sheet 6-Jan-2006
6-Aug-2007
