USB1T20 Universal Serial Bus Transceiver

September 2004
Revised September 2004

USB1T20
Universal Serial Bus Transceiver
General Description Features
The USB1T20 is a generic USB 2.0 compliant transceiver. ■ Complies with Universal Serial Bus specification 2.0 for
Using a single voltage supply, the USB1T20 provides an FS/LS applications
ideal USB interface solution for any electronic device able ■ Utilizes digital inputs and outputs to transmit and receive
to supply 3.0V to 3.6V. It is designed to allow 5.0V or 3.3V USB cable data
programmable and standard logic to interface with the
■ Supports 12Mbit/s “Full Speed” and 1.5Mbit/s
physical layer of the Universal Serial Bus. It is capable of
“Low Speed” serial data transmission
transmitting and receiving serial data at both full speed
(12Mbit/s) and low speed (1.5Mbit/s) data rates. ■ Supports single-ended and differential data interface as
function of MODE
Packaged in industry standard TSSOP and Fairchild’s
ultra-small 2.5mm x 2.5mm MLP package, the USB1T20 is ■ Single 3.3V supply
ideal for ultra-portable electronics and other space con- ■ ESD Performance: Human Body Model
strained applications. > 9.5 kV on D−, D+ pins only
> 4 kV on all other pins
■ Space saving 14-terminal MLP package

Ordering Code:
Order Number Package Number Package Description
USB1T20MPX MLP14D 14-Terminal Molded Leadless Package (MLP), 2.5mm Square
(Preliminary)
USB1T20MTC MTC14 14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
(Note 1)
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)

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USB1T20
Terminal and Pin Descriptions
Terminal or Pin
Terminal or Pin Number I/O Description
Name MLP14D MTC14
RCV 13 3 O Receive data. CMOS level output for USB differential input
OE 12 2 I Output Enable. Active LOW, enables the transceiver to transmit data on the
bus. When not active the transceiver is in receive mode.
MODE 11 1 I Mode. When left unconnected, a weak pull-up transistor pulls it to
VCC and in this GND, the Vmo/FSEO pin takes the function of FSEO
(Force SEO).
Vpo, 8, 9 12, 13 I Inputs to differential driver. (Outputs from SIE).
Vmo / FSEO MODE Vpo Vmo/FSEO RESULT
0 0 0 Logic “0”
0 1 SE0
1 0 Logic “1”
1 1 SE0
1 0 0 SE0
0 1 Logic “0”
1 0 Logic “1”
1 1 Illegal code
Vp, Vm 14, 1 4, 5 O 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).
Vp Vm RESULT
0 0 SE0
0 1 Low Speed
1 0 Full Speed
1 1 Error
D +, D− 7, 6 11, 10 AI/O Data+, Data−. Differential data bus conforming to the Universal Serial Bus
standard.
SUSPND 2 6 I 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.
SPEED 5 9 I Edge rate control. Logic “1” operates at edge rates for “full speed”.
Logic “0” operates edge rates for “low speed”.
VCC 10 14 — 3.0V to 3.6V power supply
GND 3 7 — Ground reference
NC 4 8 No Connect

Functional Truth Table

Input I/O Outputs
Mode Vpo Vmo/FSEO OE SUSPND D+ D− RCV Vp Vm Result
0 0 0 0 0 0 1 0 0 1 Logic 0
0 0 1 0 0 0 0 U 0 0 SE0
0 1 0 0 0 1 0 1 1 0 Logic 1
0 1 1 0 0 0 0 U 0 0 SE0
1 0 0 0 0 0 0 U 0 0 SE0
1 0 1 0 0 0 1 0 0 1 Logic 0
1 1 0 0 0 1 0 1 1 0 Logic 1
1 1 1 0 0 1 1 U U U Illegal Code
X X X 1 0 Z Z U U U D+/D− Hi-Z
X X X 1 1 Z Z U U U D+/D− Hi-Z
X = Don’t Care Z = 3-STATE U = Undefined State

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 USB1T20
Absolute Maximum Ratings(Note 2) Recommended Operating
DC Supply Voltage (VCC) −0.5V to +7.0V Conditions
DC Input Diode Current (IIK) Supply Voltage VCC 3.0V to 3.6V
VI < 0 −50 mA Input Voltage (VI) 0V to 5.5V
Input Voltage (VI) Input Range for AI/O (VAI/O) 0V to VCC
(Note 3) −0.5V to +5.5V Output Voltage (VO) 0V to VCC
Input Voltage (VI/O) −0.5V to VCC + 0.5V Operating Ambient Temperature
Output Diode Current (IOK) in Free Air (TAMB) −40°C to +85°C
VO > VCC or VO < 0 ±50 mA
Output Voltage (VO)
(Note 3) −0.5V to VCC + 0.5V
Output Source or Sink Current (IO)
Vp.Vm, RCV Pins
VO = 0V to VCC ±15 mA
Output Source or Sink Current (IO) Note 2: The Absolute Maximum Ratings are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
D+/D− Pins
operated at these limits. The parametric values defined in the Electrical
VO = 0V to VCC ±50 mA Characteristic tables are not guaranteed at the absolute maximum rating.
The “Recommended Operating Conditions” table will define the conditions
VCC or GND Current (ICC , IGND) ±100 mA for actual device operation.
Storage Temperature (TSTO) −60°C to + 150°C Note 3: The input and output voltage ratings may be exceeded if the input
and output clamp current ratings are observed.

DC Electrical Characteristics (Digital Pins)

Over recommended range of supply voltage and operating free air temperature (unless otherwise noted). VCC = 3.0V to 3.6V
Limits
Symbol Parameter Test Conditions Temperature = −40°C to +85°C Unit
Min Typ Max
Input Levels
VIL LOW Level Input Voltage 0.8 V
VIH HIGH Level Input Voltage 2.0 V
Output Levels
VOL LOW Level Output Voltage IOL = 4 mA 0.4
V
IOL = 20 µA 0.1
VOH HIGH Level Output Voltage IOH = 4 mA 2.4
V
IOH = 20 µA VCC – 0.1
Leakage Current
IL Input Leakage Current VCC = 3.0 to 3.6 ±5 µA
ICCFS Supply Current (Full Speed) VCC = 3.0 to 3.6 5 mA
ICCLS Supply Current (Low Speed) VCC = 3.0 to 3.6 5 mA
ICCQ Quiescent Current VCC = 3.0 to 3.6
5 mA
VIN = VCC or GND
ICCS Supply Current in Suspend VCC = 3.0 to 3.6; Mode = VCC 10 µA

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USB1T20
DC Electrical Characteristics (D+/D− Pins)
Over recommended range of supply voltage and operating free air temperature (unless otherwise noted). VCC = 3.0V to 3.6V
Limits
Symbol Parameter Test Conditions Temperature = −40°C to +85°C Units
Min Typ Max
Input Levels
VDI Differential Input Sensitivity |(D+) – (D−)| 0.2 V
VCM Differential Common Mode Range Includes VDI Range 0.8 2.5 V
VSE Single Ended Receiver Threshold 0.8 2.0 V
Output Levels
VOL Static Output LOW Voltage RL of 1.5 kΩ to 3.6V 0.3 V
VOH Static Output HIGH Voltage RL of 15 kΩ to GND 2.8 3.6 V
VCR Differential Crossover 1.3 2.0 V
Leakage Current
IOZ High Z State Data Line Leakage Current 0V < VIN < 3.3V ±5 µA
Capacitance
CIN Transceiver Capacitance Pin-to-GND 10 pF
(Note 5) Capacitance Match 10 %
Output Resistance
ZDRV Driver Output Resistance Steady State Drive 4 20 Ω
(Note 4) Resistance Match 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).
VCC = 3.0V to 3.6V; CL = 50 pF; RL = 1.5 kΩ on D+ to VCC
Limits
Symbol Parameter Test Condition Temperature = −40°C to +85°C Units
Min Typ Max
Driver Characteristics
10% and 90%
tR Rise Time Figure 1 4 20 ns
tF Fall Time Figure 1 4 20
tRFM Rise/Fall Time Matching (tR/tF) 90 110 %
VCRS Output Signal Crossover Voltage 1.3 2.0 V
Driver Timings
tPLH Driver Propagation Delay Figure 2 18 ns
tPLH (Vpo, Vmo/FSEO to D+/D−) Figure 2 18 ns
tPHZ Driver Disable Delay Figure 4 13 ns

tPLZ (OE to D+/D−) Figure 4 13 ns

tPZH Driver Enable Delay Figure 4 17 ns

tPZL (OE to D+/D−) Figure 4 17 ns

Receiver Timings
tPLH Receiver Propagation Delay Figure 3 16 ns
tPHL (D+, D− to RCV) Figure 3 19 ns
tPLH Single-ended Receiver Delay Figure 3 8 ns
tPHL (D+, D− to Vp, Vm) Figure 3 8 ns

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 USB1T20
AC Electrical Characteristics (D+/D− Pins, Low Speed)
Over recommended range of supply voltage and operating free air temperature (unless otherwise noted).
VCC = 3.0V to 3.6V; CL = 200 pF to 600 pF; RL = 1.5kΩ on D− to VCC
Limits
Symbol Parameter Test Conditions TAMB = −40°C to +85°C Unit
Min Typ Max
Driver Characteristics
10% and 90%
tLR Rise Time Figure 1 75 300 ns
tLF Fall Time Figure 1 75 300
tRFM Rise/Fall Time Matching (tR/tF) 80 120 %
VCRS Output Signal Crossover Voltage 1.3 2.0 V
Driver Timings
tPLH Driver Propagation Delay Figure 2 300 ns
tPHL (Vpo, Vmo/FSEO to D+/D−) Figure 2 300 ns
tPHZ Driver Disable Delay Figure 4 13 ns

tPLZ (OE to D+/D−) Figure 4 13 ns

tPZH Driver Enable Delay Figure 4 205 ns

tPZL (OE to D+/D−) Figure 4 205 ns

Receiver Timings
tPLH Receiver Propagation Delay Figure 3 18 ns
tPHL (D+, D− to RCV) Figure 3 18 ns
tPLH Single-ended Receiver Delay Figure 3 28 ns
tPHL (D+, D− to Vp, Vm) Figure 3 28 ns

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USB1T20
AC Waveforms
VOL and VOH are the typical output voltage drops that occur with the output load. (VCC never goes below 3.0V)

FIGURE 1. Rise and Fall Times FIGURE 2. Vpi, Vmo/FSEO to D+/D−

FIGURE 3. D+/D− to RCV, Vp/Vm

FIGURE 4. OE to D+/D−

Test Circuits and Waveforms

Load for Vm/Vp and RCV

Load for Enable and Disable Times
Note:
V = 0 for tPZH, tPHZ
V = VCC for tPZL, tPLZ

Load for D+/D−

Test S1
CL = 50 pF, Full Speed D−/LS Close
CL = 200 pF, Low Speed (Minimum Timing) D+/LS Open
CL = 600 pF, Low Speed (Maximum Timing) D−/FS Open
1.5 kΩ on D− (Low Speed) or D+ (Full Speed) only D+/FS Close

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 USB1T20
Tape and Reel Specification
Tape Format for MLP
Package Tape Number Cavity Cover Tape
Designator Section Cavities Status Status
Leader (Start End) 125 (typ) Empty Sealed
MP Carrier 2500 Filled Sealed
Trailer (Hub End) 75 (typ) Empty Sealed

TAPE DIMENSIONS inches (millimeters)

REEL DIMENSIONS inches (millimeters)

A N W1 W2
Tape Size (mm) (Typical) (mm) (Max)
(mm) (mm)
12 mm 330 178 12.4 18.4

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USB1T20
Physical Dimensions inches (millimeters) unless otherwise noted

14-Terminal Molded Leadless Package (MLP), 2.5mm Square

Package Number MLP14D

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 USB1T20 Universal Serial Bus Transceiver
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

14-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Package Number MTC14

Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
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