|
Details, datasheet, quote on part number:NUF2221W1T2G
| |
Datasheet text preview:
NUF2221W1T2 USB Upstream Terminator with ESD Protection
T h i s device is designed for applications requiring Line Termination, EMI Filtering and ESD Protection. It is intended for use in upstream USB ports, Cellular phones, Wireless equipment and computer applications. This device offers an integrated solution in a small package (SC-88/SOT-363) reducing PCB space and cost.
Features: http://onsemi.com CIRCUIT DESCRIPTION
D1(c) 6 Rup Rs Rs VBUS 5 D2(c) 4
· Provides USB Line Termination, Filtering and ESD Protection · Single IC Offers Cost Savings · Bi-directional EMI Filtering Prevents Noise from Entering/Leaving
the System · Compliance with IEC61000-4-2 (Level 4) 8 kV (Contact) 15 kV (Air) · Flexible Pull-up Line Termination to Meet USB 1.1 Low Speed and High Speed Specification · ESD Ratings: Machine Model = C ESD Ratings: Human Body Model = 3B
Benefits:
C1
C1
1 D1(i)
2 GND 4
3 D2(i)
· SC-88 Package Minimizes PCB Space · Integrated Circuit Increases System Reliability versus Discrete
Component Implementation · TVs Devices Provide ESD Protection That is Better than a Discrete Implementation because the Small IC minimizes Parasitic Inductances
Typical Applications:
5 6
3 2 1 SC-88 / SOT-363 CASE 419B PLASTIC
· USB Hubs · Computer Peripherals Using USB
MAXIMUM RATINGS (TA = 25°C)
Rating Steady State Power Maximum Junction Temperature Operating Temperature Range Storage Temperature Range Lead Solder Temperature (10 second duration) Symbol PD TJ(max) TJ Tstg TL Value 225 125 -55 to +125 -55 to +125 260 Unit mW °C °C °C °C
MARKING DIAGRAM
6 5 4
022 D
1 022 D
2
3
= NUF2221W1T2 = Date Code
ORDERING INFORMATION
Device NUF2221W1T2 RS (W) 22 Pkg. SC-88 Shipping 3000/Tape & Reel
© Semiconductor Components Industries, LLC, 2003
1
June, 2003 - Rev. 1
Publication Order Number: NUF2221W1T2/D
NUF2221W1T2
ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted)
Line Capacitance Vdc = 2.5 V f = 1 MHz pF (Note 1) Min 37.6 Typ 42 Max 56.4
Device NUF2221W1T2
VRWM (Volts) 5.25
VBR @ 1 mA (Volts) Min 5.6 Typ 6.8 Max 8.0
IR @ 3.3 V (nA) Min Typ 10 Max 100
Series Resistor RS (W) Min 17.6 Typ 22 Max 26.4
Pull-up Resistor Rup (kW) Min 1.2 Typ 1.5 Max 1.8
1. Measured between pins 1, 3, 4, 6 and ground with pin 5 also grounded. 2. For other resistance values (e.g. 15 W, 33 W), please contact your local ON Semiconductor sales representative.
TYPICAL CHARACTERISTICS
0 -5 -10 (dB) -15 -20 -25 Temp = 25°C -30 0.10 1.00 10.00 FREQUENCY (MHz) 100.00 1000.00
Figure 1. Insertion Loss Characteristics
24.5 RS = Typical 24.0 23.5 RS (W) 23.0 22.5 22.0 21.5 -20 1580 1560 RUP (W) 1540 1520 1500 1480 1460 -20 -10 1600 RUP = Typical
-10
0
10
20
30
40
50
60
70
0
10
20
30
40
50
60
70
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 2. RS versus Temperature
Figure 3. RUP versus Temperature
http://onsemi.com
2
NUF2221W1T2 APPLICATIONS BACKGROUND
What is USB?
The USB is not a serial port, it is a serial bus, a fact that enables a single port on the computer to be a link for a myriad of devices, (up to 127 devices in a USB system). We can easily chain one device to another and use one port as a connecting point of many devices by using a hub. All these enable us to look at the USB system as a small network of devices. The Universal Serial Bus (USB) makes connecting devices to your computer faster, easier and virtually limitless. High-Speed USB devices are capable of communicating at speeds up to 12 megabytes-without shutting down and without having to open your computer.
Typical USB System
Monitor Telephone
devices, handling the power management for devices that are bus-powered (get power from the bus), and responsibility for bus error detection and recovery. Another important role of the hub is to manage both full and low speed devices. When a device is attached to the system the hub detects the speed, which the device operates in, and through the whole communication on the bus prevents from full speed traffic to reach low seed device and vice versa prevent from low speed traffic to reach full speed device.
The Device
Scanner HUB Printer
Computer PC CPU
Plotter
KeyBoard
Mouse
The Device is defined as everything in the USB system, which is not a host (including hubs). A device provides one or more USB functions. Most of the devices provide only one function but there may be some, which provides more than one and called compound devices. We refer to two kinds of devices - self powered or bus powered devices. A device that gets its power from the bus is called bus powered and on the other hand a device which supplies its own power is called self powered. There are two kinds of devices for USB 1.1: Full-speed devices - operates in 12 Mb/s Low-speed devices that work in 1.5 Mb/s.
NUF2221W1T2 Device Information
Figure 4. Typical USB System
Typically the USB system consists of one host, hubs and devices.
The Host
The host in the USB system, is responsible to the whole complexity of the protocol (simplifies the designing of USB devices). The host controls the media access, therefore, no one can access the bus unless it got an approval required from the host.
The Hub
The hub provides an interconnect point, which enables many devices to connect to a single USB port. The logical topology of the USB is a star structure, all the devices are connected (logically) directly to the host. It is totally transparent to the device what is its' hub tier (the number of hubs the data has to flow through). The hub is connected to the USB host in the upstream direction (data flows "up" to the host) and is connected to the USB device in the downstream direction (data flows "down" from the host to the device). The hubs' main functionality is the responsibility of detecting an attachment and detachment of
The Universal Serial Bus (USB) specification revision 1.1 requires the USB drivers to have certain impedance characteristics. The series resistance plus the USB driver output resistance must be close to the USB cable's impedance of 45 W unbalanced (90 W balance) to minimize transmission line reflections. In addition USB 1.1 also requires upstream ports to be terminated with a pull-up resistor (usually 1.5 KW) from D+ or D- lines to VCC=3.3 V (VCC is usually taken from VBUS by using a 5 V - 3.3 V regulator). In case of EMI, the radiated and conducted EMI should be kept within the required levels as specified by the FCC regulations. Actual FCC regulations requires that class B computing devices meet the specifications of maximum levels for both radiated and conducted EMI (Radiated EMI covers the frequency range from 30 MHz to 1 GHz and Conducted EMI covers the 450 kHz to 30MHz range). The NUF2221W1T2 device from On Semiconductor provides series termination, EMI filtering and ESD protection for the two data lines (D+, D-) as well as for the VBUS. The ESD device's ratings comply with IEC61000-4-2 (Level 4), HBM class 3B and MM class C. All these futures are offered in an integrated solution placed in a small and single package (SC-88, Case 419B). The NUF2221W1T2 device is shown in the Figure 5.
http://onsemi.com
3
|
|
