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MIC2550
Micrel
MIC2550
Universal Serial Bus Transceiver Advance Information
General Description
The MIC2550 is a single-chip transceiver that complies with the physical layer specifications for Universal Serial Bus (USB). The MIC2550 supports full-speed (12Mb/s) dual supply voltage operation (patent pending) and low-speed (1.5Mb/s) operation. A unique dual supply voltage operation allows the MIC2550 to reference the system I/F I/O signals to a supply voltage down to 2.5V while independently powered by the USB VBUS. This allows the system interface to operate at its core voltage without addition of buffering logic and also reduce system operating current.
Features
Compliant to USB Specification Revision 1.1 Operation down to 2.5V Dual supply voltage operation Supports full-speed (12Mb/s) and low-speed (1.5Mb/s) operation * Speed-select termination supply * Very low power consumption meets USB suspend-current requirements * Small 14-pin TSSOP * * * *
Applications
* Personal digital assistants (PDA) * Palmtop computers * Cellular telephones
Ordering Information
Part Number MIC2550BTS Junction Temp. Range -40C to +85C Package 14-Pin TSSOP
System Diagram
1.5k
HIGH SPEED LOW SPEED
System Supply Voltage 0.47F System Interface
MIC2550 VIF OE# RCV VP VM GND SUS GND VTRM D+ D- SPD VBUS
VBUS D+ D- GND USB Interface Connector
24 24 1F
Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
October 4, 1999
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MIC2550
MIC2550
Micrel
Pin Configuration
VIF 1 SPD 2 RCV 3 VP 4 VM 5 NC 6 GND 7 14 VBUS 13 NC 12 VTRM 11 D+ 10 D- 9 OE# 8 SUS
14-Pin TSSOP (TM)
Pin Description
Pin Number 1 2 3 4 5 6, 13 7 8 9 Pin Name VIF SPD RCV VP VM NC GND SUS OE# Pin Function System Interface Supply Voltage (Input): Determines logic voltage levels for system interface signaling to logic controller. Speed (Input): Edge rate control. Logic high selects full-speed edge rates. Logic low selects low-speed edge rates. Receive Data (Output): System interface receive data interface to logic controller. Plus (Input/Output): System interface signal to logic controller. If OE# is logic 1, VP is a receiver output (+); If OE# is logic 0, VP is a driver input (+). Minus (Input/Output): System interface signal to logic controller. If OE# is logic 1, VM is a receiver output (-); If OE# is logic 0, VM is a driver input (-). not internally connected Ground: Power supply return and signal reference. Suspend (Input): Logic high turns off internal circuits to reduce supply current. Output Enable (Input): Active-low system interface input signal from from logic controller. Logic low causes transceiver to transmit data onto the bus. Logic high causes the transceiver to receive data from the bus. USB Differential Data Line - (Input/Output) USB Differential Data Line + (Input/Output) Termination Supply (Output): 3.3V speed termination resistor supply output. USB Supply Voltage (Input): Transceiver supply.
10 11 12 14
D- D+ VTRM VBUS
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Absolute Maximum Ratings (Note 1)
Supply Voltage (VIF) ................................................... +6.5V Input Voltage (VBUS) ........................ -0.5V(min)/5.5V(max) Output Current (ID+, ID-)........................................... 50mA Output Current (all others) ....................................... 15mA Input Current ............................................................ 50mA Power Dissipation (PD) ................................................ TBD Storage Temperature (TS) .......................... -65 to +150C ESD, Note 3
Operating Ratings (Note 2)
Supply Voltage (VBUS) ................................. 4.0V to 5.25V Temperature Range (TA) ........................... -40C to +85C Junction Temperature (TJ) ........................................ 160C Package Thermal Resistance TSSOP (JA) ..................................................... 100C/W
Electrical Characteristics
TA = 25C, bold values indicate -40C TA +85C; typical values at VBUS = 5.0V, VIF = 3.0V; minimum and maximum values at VBUS = 4.0V to 5.25V, VIF = 2.5V to 3.6V; unless noted. Symbol Parameter Condition Min Typ Max Units System and USB Interface DC Characteristics VBUS VIF VIL VIH VOH VOL IIL IIF USB Supply Voltage System I/F Supply voltage Low-Level Input Voltage, Note 4 High-Level Input Voltage, Note 4 High-Level Output Voltage, Note 4 Low-Level Output Voltage, Note 4 Input Leakage Current, Note 4 System I/F Supply Current D- and D+ are idle, VIF = 3.6V, VBUS = 5.25V SUS = 1, OE# = 1 D- and D+ are idle, VIF = 3.6V, VBUS = 5.25V SUS = 0, OE# = 1 D- and D+ active, CLOAD = 50pF, SPD = 1, SUS = 0, VIF = 3.6V, OE# = 0 D- and D+ active, CLOAD = 600pF, SPD = 0, SUS = 0, VIF = 3.6V, OE# = 0 IBUS USB Supply Current D- and D+ are idle, VBUS = 5.25V, SPD = 0 SUS = 1, OE# = 1 D- and D+ are idle, VBUS = 5.25V, SPD = 1 SUS = 1, OE# = 1 D- and D+ are idle, VBUS = 5.25V, SPD = 0 SUS = 0, OE# = 0 D- and D+ are idle, VBUS = 5.25V, SPD = 1 SUS = 0, OE# = 1 D- and D+ active, CLOAD = 50pF, SPD = 1, SUS = 0, VBUS = 5.25V D- and D+ active, CLOAD = 600pF, SPD = 0 SUS = 0, VBUS = 5.25V VTRM Termination Voltage ITRM = 2.5mA 3.0 3.6 1 1 2 2 140 140 140 200 200 200 200 350 IOH = 20A IOL = 20A 0.85VIF 0.9VIF 0.1 5 4.0 2.5 5.25 5.25 0.15VIF V V V V V V A A A A A A A A A mA mA V
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Symbol Parameter Condition Min Typ Max
Micrel
Units A V 2.5 2.0 200 OE# = 0, RL = 1.5k to 3.6V OE# = 0, RL = 15k to GND 2.8 1.3 pin to GND steady state drive, Note 6 6 0.3 3.6 2.0 20 18 V V mV V V V pF
Transceiver DC Characteristics ILO VDI VCM VSE VOL VOH VCRS CIN ZDRV tR tF tR/tF VCRS tR tF tR/tF VCRS
Note 1. Note 2. Note 3. Note 4. Note 5. Note 6.
Hi-Z State Data Line Leakage Differential Input Sensitivity Differential Common-Mode Range Single-Ended Receiver Threshold Receiver Hysteresis, Note 6 Static Output Low, Note 5 Static Output High, Note 5 Output Signal Crossover Voltage Note 6 Transceiver Capacitance, Note 6 Driver Output Resistance
0V < VBUS < 3.3V, D+, D-, OE# = 1 pins only (D+) - (D-), VIN = 0.8V - 2.5V includes VDI range
-10 0.2 0.8 0.8
+10
Low-Speed Driver Characteristics Transition Rise Time Transition Fall Time Rise and Fall Time Matching Output Signal Crossover Voltage CL = 50pF CL = 600pF CL = 50pF CL = 600pF TR / TF 75 300 75 300 80 1.3 125 2.0 ns ns ns ns % V
Full-Speed Driver Characteristics Transition Rise Time Transition Fall Time Rise and Fall Time Matching Output Signal Crossover Voltage
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended. Applies to the VP, VM, RCV, OE#, SPD, and SUS pins. Applies to D+, D- Not production tested. Guaranteed by design.
CL = 50pF CL = 50pF TR / TF
4 4 90 1.3
20 20 111.11 2.0
ns ns % V
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Symbol Parameter Condition Min Typ Max
Micrel
Units
Transceiver Timing tPVZ tPZD tPDZ tPZV tPLH tPHL tPLH tPHL tPLH tPHL OE# to RCVR Tristate Delay Receiver Tristate to Transmit Delay OE# to DRVR Tristate Delay Driver Tri-state to Receiver Delay V+/V- to D+/D- Propagation Delay V+/V- to D+/D- Propagation Delay D+/D- to RCV Propagation Delay D+/D- to RCV Propagation Delay D+/D- to V+/D- Propagation Delay D+/D- to V+/D- Propagation Delay Figure 1 Figure 1 Figure 1 Figure 1 Figure 4 Figure 4 Figure 3 Figure 3 Figure 3 Figure 3 15 15 15 15 15 8 8 15 15 15 ns ns ns ns ns ns ns ns ns ns
H
VOE#
L
tPVZ VP VP/VM VM tPZD VD+ VD+/VD- VD-
tPZV
Figure 1. Enable and Disable Times
VD+ Differential 90% Data Lines 10% VD-
VCRS tR tF
Figure 2. Rise and Fall Times
Differential VD+ Data Lines V D- VOH Output V OL VSS
tPLH
tPHL
Figure 3. Receiver Propagaion Delay D+/D- to RCV, VP, and VM
VOI Input V OL VSS Differential VD+ Data Lines V D-
tPLH
tPHL
Figure 4. Driver Propagation Delay VP and VM to D+/D-
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OE# = 0 (Transmit): Input VP 0 0 1 1 OE# = 1 (Receive): Input D+ 0 0 1 1 D- 0 1 0 1 VP 0 0 1 1 Output VM 0 1 0 1 RCV X 0 1 X Result SE0 Logic 0 Logic 1 Undefined VM 0 1 0 1 D+ 0 0 1 1 Output D- 0 1 0 1 RCV X 0 1 X Result SE0 Logic 0 Logic 1 Undefined
Table 1. Truth Table
Test Circuits
Device Under Test 24 Test Point 500 V
50pF For D+/D-: V = 0V for tPZH and tPHZ V = VBUS for tPZL and tPLZ
Load for Enable and Disable Time (D+/D-)
Device Under Test
25pF
VP, VM, and RCV Load
VTRM 1.5k*
Device Under Test
24 15k CL
CL = 50pF, full speed CL = 50pF, low speed (minimum timing) CL = 600pF, low speed (maximum timing) *1.5k on D- for low speed or D+ for high speed
D+ and D- Load MIC2550 6 October 4, 1999
MIC2550
Micrel
Block Diagram
SYSTEM I/F VOLTAGE DOMAIN USB VOLTAGE DOMAIN
VIF
Regulator
TO INTERNAL CIRCUITS
VBUS VTRM
SPD
D- D+
OE#
RCV
VP
VM SUS GND
Applications Information
The MIC2550 is designed to provide USB connectivity in mobile systems where system supply voltages are not available to satisfy USB requirements. The MIC2550 can operate down to supply voltages of 2.5V and still meet USB physical layer specifications. As shown in the system diagram, the MIC2550 takes advantage of USB's supply voltage, VBUS, to operate the transceiver. The system voltage, VIF, is used to set the reference voltage used by the digital I/O lines (VP, VM, RCV, OE#, SPD, and SUS pins) interfacing to the system. Internal circuitry provides translation between the USB and system voltage domains. VIF will typically be the main supply voltage rail for the system. In addition, a 3.3V, 10% termination supply voltage, VTRM, is provided to support speed selection. A 0.47F (minimum) capacitor from VTRM to ground is required to ensure stability. A 1.5K resistor is required between this pin and the D+ or D- lines to respectively specify full-speed or low-speed operation. Suspend When the suspend pin (SUS) is high, power consumption is reduced to a minimum. VTRM is not disabled. RCV, VP and VM are still functional to enable the device to detect USB activity. For minimal current consumption in suspend mode, it is recommended that OE# = 1. October 4, 1999 7
External ESD Protection The use of ESD transient protection devices is not required for operation, but is recommended. Nonmultiplexed Bus To save pin count for the USB logic controller interface, the MIC2550 was designed with VP and VM as bidirectional pins. To interface the MIC2550 with a nonmultiplexed data bus, resistors can be used for low cost isolation as shown in Figure 6.
USB Logic Controller (SIE) VP 10k VPO VM 10k VMO VM
MIC2550 VP
Figure 6. MIC2550 Interface to Nonmultiplexed Data Bus.
MIC2550
MIC2550
Micrel
Package Information
4.50 (0.177) 6.4 BSC (0.252) 4.30 (0.169)
DIMENSIONS: MM (INCH)
0.30 (0.012) 0.19 (0.007) 5.10 (0.200) 4.90 (0.193) 1.10 MAX (0.043) 0.20 (0.008) 0.09 (0.003)
0.65 BSC (0.026)
0.15 (0.006) 0.05 (0.002)
8 0
1.00 (0.039) REF 0.70 (0.028) 0.50 (0.020)
14-Pin TSSOP (TS)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 1999 Micrel Incorporated
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