USB1T20 Universal Serial Bus Transceiver
September 2004
Revised January 2005
USB1T20
Universal Serial Bus Transceiver
General Description
The USB1T20 is a generic USB 2.0 compliant transceiver.
Using a single voltage supply, the USB1T20 provides an
ideal USB interface solution for any electronic device able
to supply 3.0V to 3.6V. It is designed to allow 5.0V or 3.3V
programmable and standard logic to interface with the
physical layer of the Universal Serial Bus. It is capable of
transmitting and receiving serial data at both full speed
(12Mbit/s) and low speed (1.5Mbit/s) data rates.
Packaged in industry standard TSSOP and Fairchild’s
ultra-small 2.5mm x 2.5mm MLP package, the USB1T20 is
ideal for ultra-portable electronics and other space con-
strained applications.
Features
s
Complies with Universal Serial Bus specification 2.0 for
FS/LS applications
s
Utilizes digital inputs and outputs to transmit and receive
USB cable data
s
Supports 12Mbit/s “Full Speed” and 1.5Mbit/s
“Low Speed” serial data transmission
s
Supports single-ended and differential data interface as
function of MODE
s
Single 3.3V supply
s
ESD Performance: Human Body Model
>
9.5 kV on D
−
, D
+
pins only
>
4 kV on all other pins
s
Space saving 14-terminal MLP package
Ordering Code:
Order Number
USB1T20MPX
(Preliminary)
USB1T20MTC
(Note 1)
Package Number
MLP14D
MTC14
Package Description
14-Terminal Molded Leadless Package (MLP), 2.5mm Square
14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Note 1:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Diagram
Connection Diagrams
Terminal Assignments for MLP (Preliminary)
(Top View)
Pin Assignments for TSSOP
(Top View)
© 2005 Fairchild Semiconductor Corporation
DS500894
www.fairchildsemi.com
USB1T20
Terminal and Pin Descriptions
Terminal or Pin
Name
MLP14D MTC14
RCV
OE
MODE
13
12
11
3
2
1
Terminal or Pin
Number
I/O
O
I
I
Description
Receive data. CMOS level output for USB differential input
Output Enable. Active LOW, enables the transceiver to transmit data on the
bus. When not active the transceiver is in receive mode.
Mode. When left unconnected, a weak pull-up transistor pulls it to
V
CC
and in this GND, the V
mo
/F
SEO
pin takes the function of F
SEO
(Force SEO).
Inputs to differential driver. (Outputs from SIE).
MODE
0
V
po
0
0
1
1
1
0
0
1
1
V
p
, V
m
14, 1
4, 5
O
V
mo
/F
SEO
0
1
0
1
0
1
0
1
RESULT
Logic “0”
SE0
Logic “1”
SE0
SE0
Logic “0”
Logic “1”
Illegal code
V
po
,
V
mo
/ F
SEO
8, 9
12, 13
I
Gated version of D
−
and D
+
. Outputs are logic “0” and logic “1”. Used to
detect single ended zero (SE0), error conditions, and interconnect speed.
(Input to SIE).
V
p
0
0
1
1
V
m
0
1
0
1
RESULT
SE0
Low Speed
Full Speed
Error
D
+
, D
−
SUSPND
7, 6
2
11, 10
6
AI/O
I
Data
+
, Data
−
. Differential data bus conforming to the Universal Serial Bus
standard.
Suspend. Enables a low power state while the USB bus is inactive. While
the SUSPND pin is active it will drive the RCV pin to a logic “0” state. Both
D
+
and D
−
are 3-STATE.
Edge rate control. Logic “1” operates at edge rates for “full speed”.
Logic “0” operates edge rates for “low speed”.
3.0V to 3.6V power supply
Ground reference
No Connect
SPEED
V
CC
GND
NC
5
10
3
4
9
14
7
8
I
—
—
Functional Truth Table
Input
Mode
0
0
0
0
1
1
1
1
X
X
X
=
Don’t Care
I/O
OE
0
0
0
0
0
0
0
0
1
1
SUSPND
0
0
0
0
0
0
0
0
0
1
D
+
0
0
1
0
0
0
1
1
Z
Z
D
−
1
0
0
0
0
1
0
1
Z
Z
RCV
0
U
1
U
U
0
1
U
U
U
Outputs
V
p
0
0
1
0
0
0
1
U
U
U
V
m
1
0
0
0
0
1
0
U
U
U
Result
Logic 0
SE0
Logic 1
SE0
SE0
Logic 0
Logic 1
Illegal Code
D
+
/D
−
Hi-Z
D
+
/D
−
Hi-Z
V
po
0
0
1
1
0
0
1
1
X
X
V
mo
/F
SEO
0
1
0
1
0
1
0
1
X
X
Z
=
3-STATE
U
=
Undefined State
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2
USB1T20
Absolute Maximum Ratings
(Note 2)
DC Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
<
0
Input Voltage (V
I
)
(Note 3)
Input Voltage (V
I/O
)
Output Diode Current (I
OK
)
V
O
>
V
CC
or V
O
<
0
Output Voltage (V
O
)
(Note 3)
Output Source or Sink Current (I
O
)
V
p
.V
m
, RCV Pins
V
O
=
0V to V
CC
Output Source or Sink Current (I
O
)
D
+
/D
−
Pins
V
O
=
0V to V
CC
V
CC
or GND Current (I
CC
, I
GND
)
Storage Temperature (T
STO
)
−
0.5V to
+
7.0V
−
50 mA
−
0.5V to
+
5.5V
−
0.5V to V
CC
+
0.5V
±
50 mA
−
0.5V to V
CC
+
0.5V
Recommended Operating
Conditions
Supply Voltage V
CC
Input Voltage (V
I
)
Input Range for AI/O (V
AI/O
)
Output Voltage (V
O
)
Operating Ambient Temperature
in Free Air (T
AMB
)
3.0V to 3.6V
0V to 5.5V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
±
15 mA
Note 2:
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 guaranteed at the absolute maximum rating.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Note 3:
The input and output voltage ratings may be exceeded if the input
and output clamp current ratings are observed.
±
50 mA
±
100 mA
−
60
°
C to
+
150
°
C
DC Electrical Characteristics
(Digital Pins)
Over recommended range of supply voltage and operating free air temperature (unless otherwise noted). V
CC
=
3.0V to 3.6V
Limits
Symbol
Input Levels
V
IL
V
IH
V
OL
V
OH
LOW Level Input Voltage
HIGH Level Input Voltage
LOW Level Output Voltage
HIGH Level Output Voltage
I
OL
=
4 mA
I
OL
=
20
µA
I
OH
=
4 mA
I
OH
=
20
µA
Leakage Current
I
L
I
CCFS
I
CCLS
I
CCQ
I
CCS
Input Leakage Current
Supply Current (Full Speed)
Supply Current (Low Speed)
Quiescent Current
Supply Current in Suspend
V
CC
=
3.0 to 3.6
V
CC
=
3.0 to 3.6
V
CC
=
3.0 to 3.6
V
CC
=
3.0 to 3.6
V
IN
=
V
CC
or GND
V
CC
=
3.0 to 3.6; Mode
=
V
CC
±5
5
5
5
10
µA
mA
mA
mA
µA
2.4
V
CC
– 0.1
2.0
0.4
0.1
0.8
V
V
Parameter
Test Conditions
Temperature
= −40°C
to
+85°C
Min
Typ
Max
Unit
Output Levels
V
V
3
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USB1T20
DC Electrical Characteristics
Symbol
Input Levels
V
DI
V
CM
V
SE
Output Levels
V
OL
V
OH
V
CR
I
OZ
Capacitance
C
IN
(Note 5)
Z
DRV
(Note 4)
Transceiver Capacitance
Capacitance Match
Driver Output Resistance
Resistance Match
Static Output LOW Voltage
Static Output HIGH Voltage
Differential Crossover
Differential Input Sensitivity
Differential Common Mode Range
Single Ended Receiver Threshold
Parameter
(D
+
/D
−
Pins)
Limits
Test Conditions
Temperature
= −40°C
to
+85°C
Min
Typ
Max
V
2.5
2.0
0.3
2.8
1.3
3.6
2.0
±5
10
10
V
V
V
V
V
µA
pF
%
Ω
%
Units
Over recommended range of supply voltage and operating free air temperature (unless otherwise noted). V
CC
=
3.0V to 3.6V
|(D+) – (D−)|
Includes V
DI
Range
0.2
0.8
0.8
R
L
of 1.5 kΩ to 3.6V
R
L
of 15 kΩ to GND
Leakage Current
High Z State Data Line Leakage Current 0V
<
V
IN
<
3.3V
Pin-to-GND
Output Resistance
Steady State Drive
4
20
10
Note 4:
Excludes external resistor. In order to comply with USB Specification 1.1, external series resistors of 24Ω
±
1% each on D+ and D− are recom-
mended. This specification is guaranteed by design and statistical process distribution.
Note 5:
This specification is guaranteed by design and statistical process distribution.
AC Electrical Characteristics
(D
+
/D
−
Pins, Full Speed)
Over recommended range of supply voltage and operating free air temperature (unless otherwise noted).
V
CC
=
3.0V to 3.6V; C
L
=
50 pF; R
L
=
1.5 k
Ω
on D
+
to V
CC
Limits
Symbol
Driver Characteristics
10% and 90%
t
R
t
F
t
RFM
V
CRS
t
PLH
t
PLH
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PLH
t
PHL
t
PLH
t
PHL
Rise Time
Fall Time
Rise/Fall Time Matching
Output Signal Crossover Voltage
Driver Propagation Delay
(V
po
, V
mo
/F
SEO
to D+/D−)
Driver Disable Delay
(OE to D+/D−)
Driver Enable Delay
(OE to D+/D−)
Receiver Propagation Delay
(D+, D− to RCV)
Single-ended Receiver Delay
(D+, D− to V
p
, V
m
)
Figure 2
Figure 2
Figure 4
Figure 4
Figure 4
Figure 4
Figure 3
Figure 3
Figure 3
Figure 3
Figure 1
Figure 1
(t
R
/t
F
)
4
4
90
1.3
20
20
110
2.0
18
18
13
13
17
17
16
19
8
8
%
V
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Parameter
Test Condition
Temperature
= −40°C
to
+85°C
Min
Typ
Max
Units
Driver Timings
Receiver Timings
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4
USB1T20
AC Electrical Characteristics
(D
+
/D
−
Pins, Low Speed)
Over recommended range of supply voltage and operating free air temperature (unless otherwise noted).
V
CC
=
3.0V to 3.6V; C
L
=
200 pF to 600 pF; R
L
=
1.5k
Ω
on D
−
to V
CC
Limits
Symbol
Driver Characteristics
10% and 90%
t
LR
t
LF
t
RFM
V
CRS
t
PLH
t
PHL
t
PHZ
t
PLZ
t
PZH
t
PZL
t
PLH
t
PHL
t
PLH
t
PHL
Rise Time
Fall Time
Rise/Fall Time Matching
Output Signal Crossover Voltage
Driver Propagation Delay
(V
po
, V
mo
/F
SEO
to D+/D−)
Driver Disable Delay
(OE to D+/D−)
Driver Enable Delay
(OE to D+/D−)
Receiver Propagation Delay
(D+, D− to RCV)
Single-ended Receiver Delay
(D+, D− to V
p
, V
m
)
Figure 2
Figure 2
Figure 4
Figure 4
Figure 4
Figure 4
Figure 3
Figure 3
Figure 3
Figure 3
Figure 1
Figure 1
(t
R
/t
F
)
75
75
80
1.3
300
300
120
2.0
300
300
13
13
205
205
18
18
28
28
%
V
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Parameter
Test Conditions
Min
T
AMB
= −40°C
to
+85°C
Typ
Max
Unit
Driver Timings
Receiver Timings
5
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