Output Enable: Active LOW enables the transceiver to transmit data on the bus. When not
active the transceiver is in the receive mode (CMOS level is relative to V
CCIO
)
Receive Data Output: Non-inverted CMOS level output for USB differential Input (CMOS
output level is relative to V
CCIO
). Driven LOW when SUSPN is HIGH; RCV output is stable
and preserved during SE0 condition.
Single-ended D
receiver output V
P
(CMOS level relative to V
CCIO
): Used for external
detection of SEO, error conditions, speed of connected device; Driven HIGH when no
supply connected to V
CC
and V
REG
.
Single-ended D
receiver output V
m
(CMOS level relative to V
CCIO
): Used for external
detection of SEO, error conditions, speed of connected device; Driven HIGH when no
supply connected to V
CC
and V
REG
.
Suspend: Enables a low power state (CMOS level is relative to V
CCIO
).
While the SUSPND pin is active (HIGH) it will drive the RCV pin to logic “0” state.
MODE input (CMOS level is relative to V
CCIO
). A HIGH selects the differential input MODE
(V
po
, V
mo
) whereas a LOW enables the single-ended MODE (V
o
, V
FSEO
) see Table 2 and
Table 4
Supply Voltage for digital I/O pins (1.65V to 3.6V): When not connected the D
and D
pins are in 3-STATE. This supply bus is totally independent of V
CC
(5V) and V
REG
(3.3V).
3
V
p
O
4
V
m
O
5
6
SUSPND
MODE
I
I
7
8
10, 9
11
12
13
14
15
V
CCIO
Vbusmon
D
, D
V
po
/ V
o
V
mo
/ F
SEO
V
REG
(3.3V)
V
CC
(5.0V)
V
PU
(3.3V)
O
AI/O
I
I
Vbus monitor output (CMOS level relative to V
CCIO
): When Vbus
!
4.1V then
Vbusmon = HIGH and when Vbus
3.6V then Vbusmon = LOW.
Data
, Data
: Differential data bus conforming to the USB standard.
Driver Data Input (CMOS level is relative to V
CCIO
); Schmitt trigger input; see Table 2 and
Table 3
Driver Data Input (CMOS level is relative to V
CCIO
); Schmitt trigger input; see Table 2 and
Table 3
Internal Regulator Option: Regulated supply output voltage (3.0V to 3.6V) during 5V oper-
ation; decoupling capacitor of at least 0.1
P
F is required.
Internal Regulator Option: Used as supply voltage input (4.0V to 5.5V); can be connected
directly to USB line Vbus.
Pull-up Supply Voltage (3.3V
r
10%): Connect an external 1.5k
:
resistor on D
(FS data
rate); Pin function is controlled by Config input pin:
Config = LOW
V
PU
(3.3V) is floating (High Impedance) for zero pull-up current.
Config = HIGH
V
PU
(3.3V) = 3.3V; internally connected to V
REG
(3.3V).
16
Config
I
USB connect or disconnect software control input. Configures 3.3V to external 1.5k
:
resistor on D
when HIGH.
www.fairchildsemi.com
2
USB1T1104
Terminal
Number
Exposed
Diepad
Terminal
Name
GND
I/O
GND
Terminal Description
GND supply down bonded to exposed diepad to be connected to the PCB GND.
Functional Description
The USB1T1104 transceiver is designed to convert CMOS data
into USB differential bus signal levels and to convert USB differ-
ential bus signal to CMOS data.
To minimize EMI and noise the outputs are edge rate controlled
with the rise and fall times controlled and defined for full speed
data rates. The rise, fall times are balanced between the differ-
ential pins to minimize skew.
Table 1 describes the specific pin functionality selection.
Table 2, Table 3, and Table 4 describe the specific Truth Tables
for Driver and Receiver operating functions.
The USB1T1104 also has the capability of various power supply
configurations to support mixed voltage supply applications (see
Table 5) and Power Supply Configurations and Options for
detailed descriptions.
Functional Tables
TABLE 1. Function Select
SUSPND
L
L
H
H
OE
L
H
L
H
D, D
Driving &
Receiving
Receiving
(Note 1)
Driving
3-STATE
(Note 1)
RCV
Active
Active
Inactive
(Note 2)
Inactive
(Note 2)
V
p
/V
m
Active
Active
Active
Active
Function
Normal Driving (Differential Receiver Active)
Receiving
Driving during Suspend
(Differential Receiver Inactive)
Low Power State
Note 1:
Signal levels is function of connection and/or pull-up/pull-down resistors.
Note 2:
For SUSPND = HIGH mode the differential receiver is inactive and the output RCV output is forced LOW. The out-of-suspend signaling (K) is detected via the single-
ended receiver outputs of the V
p
and V
m
pins.
TABLE 2. Driver Function (OE = L) using Differential Input Interface Mode Pin = H
V
mo
L
L
H
H
Note 3:
SE0 = Single Ended Zero
V
po
L
H
L
H
Data
SE0 (Note 3)
Differential Logic 1
Differential Logic 0
Illegal State
TABLE 3. Driver Function (OE = L) using Single-ended Input Interface Mode Pin = L
FSE0
L
L
H
H
Note 4:
SE0 = Single Ended Zero
V
o
L
H
L
H
Data
Differential Logic 0
Differential Logic 1
SE0 (Note 4)
SE0 (Note 4)
3
www.fairchildsemi.com
USB1T1104
TABLE 4. Receiver Function (OE = H)
D, D
Differential Logic 1
Differential Logic 0
SE0
Sharing Mode
X = Don’t Care
RCV
H
L
X
L
V
p
H
L
L
H
V
m
L
H
L
H
Power Supply Configurations and Options
The three modes of power supply operation are:
• Normal Mode: Regulated Output
1. Regulated Output. V
CCIO
is connected and V
CC
(5.0) is
connected to 5V (4.0V to 5.5V) and the internal voltage
regulator then produces 3.3V for the USB connections.
For normal mode the V
CCIO
is an independent voltage source
(1.65V to 3.6V) that is a function of the external circuit config-
uration.
• Sharing Mode: V
CCIO
is only supply connected. V
CC
and
V
REG
are not connected. In this mode the D
and D
pins are
3-STATE and the USB1T1104 allows external signals up to
3.6V to share the D
and D
bus lines. Internally the circuitry
limits leakage from D
and D
pins (maximum 10
P
A) and
V
CCIO
such that device is in low power (suspended) state.
Pins Vbusmon and RCV are forced LOW as an indication of
this mode with Vbusmon being ignored during this state.
• Disable Mode: V
CCIO
is not connected and V
CC
(5V) is con-
nected. In this mode the D
and D
pins are 3-STATE and the
device is in low power state.
A summary of the Supply Configurations is described in Table 5.
TABLE 5. Power Supply Configuration Options
Pins
V
CC
(5V)
V
REG
(3.3V)
V
CCIO
V
PU
(3.3V)
D
, D
V
p
, V
m
RCV
OE, SUSPND, Config,
V
po
/V
o
, V
mo
/F
SEO
, MODE
Note 5:
Hi-Z or forced LOW.
Power Supply Mode Configuration
Sharing
3.6V
Pulled LOW
Regulator OFF
1.65V to 3.6V Source
3-STATE (Off)
3-STATE
H
L
Hi-Z
Disable
Connected to 5V Source
3.3V, 300
P
A
Regulated Output
Not Connected
3-STATE (Off)
3-STATE
Invalid
Invalid
Hi-Z
Normal (Regulated Output)
Connected to 5V Source
3.3V, 300
P
A
Regulated Output
1.65V to 3.6V Source
3.3V Available if
Config = HIGH
Function of
Mode Set Up
Function of
Mode Set Up
Function of
Mode Set Up
Function of
Mode Set Up
www.fairchildsemi.com
4
USB1T1104
Absolute Maximum Ratings
(Note 6)
Supply Voltage (V
CC
)(5V)
I/O Supply Voltage (V
CCIO
)
Latch-up Current (I
LU
)
V
I
=
1.8V to
5.4V
DC Input Current (I
IK
)
V
I
0
DC Input Voltage (V
I
)
(Note 7)
DC Output Diode Current (I
OK
)
V
O
!
V
CC
or V
O
0
DC Output Voltage (V
O
)
(Note 7)
Output Source or Sink Current (I
O
)
V
O
= 0 to V
CC
Current for D
, D
Pins
Current for RCV, V
m
/V
p
DC V
CC
or GND Current
(I
CC
, I
GND
)
ESD Immunity Voltage (V
ESD
);
Contact HBM
Pins D
, D
, and GND
All Other Pins
Storage Temperature (T
STO
)
Power Dissipation (P
TOT
)
I
CC
(5V)
I
CCIO
48 mW
9 mW
15kV
2.5kV
150 mA
Recommended Operating Conditions
DC Supply Voltage V
CC
(5V)
I/O DC Voltage V
CCIO
DC Input Voltage Range (V
I
)
DC Input Range for AI/O (V
IA/O
)
Pins D
and D
Operating Ambient Temperature
(T
AMB
)
4.0V to 5.5V
1.65V to 3.6V
0V to V
CCIO
0.5V
0V to 3.6V
0V to 3.6V
0.5V to
6.0V
0.5V to
4.6V
18 mA
0.5V to V
CCIO
0.5V
r
18 mA
0.5V to V
CCIO
0.5V
40
q
C to
85
q
C
r
12 mA
r
12 mA
r
100 mA
40
q
C to
125
q
C
Note 6:
The Absolute Maximum Ratings are those values beyond which the safety of
the device cannot be guaranteed. The device should not be operated at these limits.
The parametric values defined in the Electrical Characteristic tables are not guaran-
teed at the absolute maximum rating. The “Recommended Operating Conditions”
table will define the conditions for actual device operation.
Note 7:
IO Absolute Maximum Rating must be observed.
DC Electrical Characteristics
(Supply Pins)
Over recommended range of supply voltage and operating free air temperature (unless otherwise noted).
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