Fairchild USB1T20 service manual

USB1T20
Universal Serial Bus Transceiver

USB1T20 Universal Serial Bus Transceiver

September 2004
Revised January 2005

General Description

The USB1T20 is a generic USB 2.0 compli ant tra nsceiver.
Using a single volta ge supply, the USB1T20 provides an
ideal USB interface solu tion for any electronic devi ce able
to supply 3.0V to 3.6V. It is designed to allo w 5.0 V or 3.3V
programmable and standard logic to interface with the
physical layer of the Universal Ser ial Bus. It is capable of
transmitting and receiving serial data at both full speed
(12Mbit/s) and low speed (1.5Mbi t/s) dat a rate s.

Packaged in industry standard TSSOP and Fairchild’s
ultra-small 2.5mm x 2. 5m m M LP pa ckag e, th e U SB 1T20 is
ideal for ultra-portable electronics and other space con­strained applications.

Features

■ Complies with Universal Serial Bus specification 2.0 for
FS/LS applications

■ Utilizes digital inputs and outputs to transmit and receive
USB cable data

■ Supports 12Mbit/s “Full Speed” and 1.5Mbi t/s
“Low Speed” serial data transmission

■ Supports single-end ed and differen tial data inte rface as
function of MODE

■ Single 3. 3V supply

■ ESD Performance: Human Body Model

> 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
(Preliminary)

USB1T20MTC
(Note 1)

Note 1: Devices also available in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.

MLP14D 14-Terminal Molded Leadless Package (MLP), 2.5mm Square

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

Logic Diagram Connection Diagrams

Te rminal Assignments for MLP (Preliminary)

(Top View)

Pin Assignments for TSSOP

(Top View)

© 2005 Fairchild Semiconductor Corporation DS500894 www.fairchildsemi.com

Terminal and Pin Descriptions

Terminal or Pin

Ter minal or Pin

USB1T20

Name

Number

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

MODE 11 1 I Mode. When left unconnected, a weak pull-up transistor pulls it to

V

, 8, 9 12, 13 I Inputs to differential driver. (Outputs from SIE).

po

V

/ F

mo

SEO

V

, V

p

m

D

+, D− 7, 6 11, 10 AI/O Data+, Data−. Differential data bus conforming to the Universal Serial Bus

14, 1 4, 5 O Gated version of D− and D+. Outputs are logic “0” and logic “1”. Used to

SUSPND 2 6 I Suspend. Enables a low power state while the USB bus is inactive. While

SPEED 5 9 I Edge rate control. Logic “1” operates at edge rates for “full speed”.

V

CC

10 14 — 3.0V to 3.6V power supply

GND 3 7 — Ground reference

NC 4 8 No Connect

I/O Description

bus. When not active the transceiver is in receive mode.

and in this GND, the Vmo/F

V

CC

(Force SEO).

MODE V

pin takes the function of F

SEO

po

Vmo/F

SEO

000Logic “0”

01SE0
1 0 Logic “1”
11SE0

100SE0

0 1 Logic “0”
1 0 Logic “1”
1 1 Illegal code

detect single ended zero (SE0

), error conditions, and interconnect speed.

(Input to SIE).

V

p

V

m

RESULT

0 0 SE0
0 1 Low Speed
1 0 Full Speed
11Error

standard.

the SUSPND pin is active it will drive the RCV pin to a logic “0” state. Both

+ and D− are 3-STATE.

D

Logic “0” operates edge rates for “low speed”.

SEO

RESULT

Functional Truth Table

Input I/O Outputs

Mode

Vmo/F

V

po

OE SUSPND D+ D− RCV

SEO

V

0 0 0 0 0 0 1 0 0 1 Logic 0
00 1 0000U00SE0

0 1 0 0 0 1 0 1 1 0 Logic 1
01 1 0000U00SE0
10 0 0000U00SE0

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 ZZUUUD
X X X 1 1 ZZUUUD

X = Don’t Care Z = 3-STATE U = Undefined State

www.fairchildsemi.com 2

V

p

m

Result

+/D− Hi-Z
+/D− Hi-Z

Absolute Maximum Ratings(Note 2) Recommended Operating

DC Supply Voltage (VCC) −0.5V to +7.0V
DC Input Diode Current (I

V

< 0 −50 mA

I

Input Voltage (V

)

I

(Note 3)

Input Voltage (V

I/O

Output Diode Current (I

V

> VCC or VO < 0 ±50 mA

O

Output Voltage (V

(Note 3)

Output Source or Sink Current (I

V

, RCV Pins

p.Vm

= 0V to V

V

O

CC

Output Source or Sink Current (I

D

+/D− Pins

= 0V to V

V

O

V

or GND Current (ICC, I

CC

CC

Storage Temperature (T

)

IK

−0.5V to +5.5V

) −0.5V to VCC + 0.5V

)

OK

)

O

)

O

−0.5V to V

CC

+ 0.5V

±15 mA

)

O

±50 mA

) ±100 mA

GND

) −60°C to + 150°C

STO

Conditions

Supply Voltage V
Input Voltage (V
Input Range for AI/O (V
Output Voltage (VO)0V to V
Operating Ambient Temperature

in Free Air (T

Note 2: The Absolute Maxi mum Ratings are thos e values beyond which
the safety of the d evice cannot b e guaranteed . The device sh ould not be
operated at these limit s. The parametric values defi ned in the Electrical
Characteristic tables are not guaranteed at the absolute maximum rating.
The “Recomm ended O peratin g Cond itions ” table will defin e the condition s
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.

CC

) 0V to 5.5V

I

AMB

)0V to V

AI/O

) −40°C to +85°C

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

Symbol Parameter Test Conditions

Input Levels

V

IL

V

IH

Output Levels

V

OL

V

OH

Leakage Current

I

L

I

CCFS

I

CCLS

I

CCQ

I

CCS

LOW Level Input Voltage 0.8 V
HIGH Level Input Voltage 2.0 V

LOW Level Output Voltage IOL = 4 mA 0.4

HIGH Level Output Voltage IOH = 4 mA 2.4

Input Leakage Current VCC = 3.0 to 3.6 ±5 µA
Supply Current (Full Speed) VCC = 3.0 to 3.6 5 mA
Supply Current (Low Speed) VCC = 3.0 to 3.6 5 mA
Quiescent Current VCC = 3.0 to 3.6

Supply Current in Suspend VCC = 3.0 to 3.6; Mode = V

IOL = 20 µA0.1

= 20 µAV

I

OH

VIN = VCC or GND

CC

Min Typ Max

CC

Limits

– 0.1

USB1T20

3.0V to 3.6V

CC
CC

UnitTemperature = −40°C to +85°C

V

V

5mA

10 µA

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