MIC2551A-2.5
Micrel, Inc.
MIC2551A-2.5
USB Transceiver
General Description
The MIC2551A is a single chip transceiver that complies
with the physical layer specifications of the Universal Serial
Bus (USB) 2.0. It supports both full speed (12Mbps) and low
speed (1.5Mbps) operation and introduces superior edge rate
control, producing crisper eye diagrams. This in turn, eases
the task of passing USB compliance testing.
A unique, patented, dual supply voltage operation allows
the MIC2551A to reference the system I/F I/O signals to a
supply voltage down to 1.6V while independently powered
by the USB V
BUS
. This reduces system operating current
and allows the system to operate at its core voltage without
additional buffering logic.
MIC2551A-2.5 is differentiated from MIC2551A by a smaller
space saving MLF
®
package (2.5mm × 2.5mm) and ±15kV
ESD protection which eliminates the need for separate ESD
protection devices on the D+, D- data lines.
Data sheets and support documentation can be found on
Micrel's web site at www.micrel.com.
Features
• ±15kV ESD protection on V
BUS
, D+ and D-
• Smaller 2.5mm × 2.5mm MLF
®
package
• USB 1.1 and 2.0 compliant transceiver (full speed -
12Mbs and low speed - 1.5Mbps) operation
• Separate I/O supply with operation down to 1.6V
• Integrated speed select termination supply
• Very-low power consumption to meet USB suspend
current requirements
• No power supply sequencing requirements
• Software controlled enumeration
Applications
•
•
•
•
PDAs
Palmtops
Cell phones
PC peripherals
Ordering Information
Part Number
MIC2551AYML25
Junction Temp. Range
-40°C to +85°C
Package - Pb Free
2.5mm×2.5mm MLF
®
Typical Application
MIC2551A
Transceiver
V I/O
VIF
CON
OE#
USB
Controller
RCV
VP
VM
SPD
SUS
VTRM
VPU
VBUS
D+
D–
1.5 k
20Ω 1%
20Ω 1%
1.0µF
V
BUS
D+
D–
GND
USB
Port
10µF
GND
GND
Typical Application Circuit
MicroLeadFrame and MLF are registered trademarks of Amkor Technology.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2010
1
M9999-030810
MIC2551A-2.5
Micrel, Inc.
Pin Configuration
VBUS
SPD
14
13
VIF
12
11
10
9
8
RCV
VP
VM
CON
1
2
3
4
5
6
7
VPU
VTRM
D+
D-
OE#
14-Pin MLF
®
(ML)
GND
SUS
Pin Description
Pin Number
1
2
3
4
5
6
7
8
9
10
11
Pin Name
RCV
VP
VM
CON
GND
SUS
OE#
D-
D+
VTRM
VPU
I
I
I/O
O
O
I/O
O
I/O
I/O
I
Pin Description
Receive Data: Output for USB differential data.
If OE# = 1, VP = Receive output (+) If OE# = 0, VP = Driver input (+).
If OE# = 1, VM = Receive output (-) If OE# = 0, VM = Driver input (-).
CONNECT (Input): Controls state of VPU. Refer to VPU pin description
for detail.
Ground Reference.
Suspend: Active-High. Turns off internal circuits to reduce supply
current.
Output Enable: Active-Low. Enables the transceiver to transmit data
onto the bus. When inactive, the trasceiver is in the receive mode.
Differential data lines conforming to the USB standard.
3.3V Reference Supply Output: Requires a minimum 0.1µF decoupling
capacitor for stability. A 1µF capacitor is recommended.
Pull-up Supply Voltage Output: Used to connect 1.5kΩ pull-up speed
detect resistor. If CON = 1, VPU is high impedance. If CON = 0, VPU =
3.3V.
USB Bus Supply Voltage: Used to power USB transceiver and internal
circuitry.
System Interface Supply Voltage: Used to provide reference supply
voltage for system I/O interface signaling.
Edge Rate Control: A logic HIGH operates at edge rates for "full speed"
operation. A logic LOW operates edge rates for "low-speed" operation.
12
13
14
VBUS
VIF
SPD
I
I
I
M9999-030810
2
March 2010
MIC2551A-2.5
Micrel, Inc.
SUS
0
0
1
1
OE#
0
1
0
1
D+, D–
Driving
Receiving
Hi-Z
Hi-Z
RCV
Active
Active
0
0
VP/VM
Active
Active
Not Active
Active
Function
Normal transmit mode.
Normal receive mode.
Low power state.
Receiving during suspend (low power
state) (Note 1)
Note 1. During suspend, VP and VM are active in order to detect out-of-band signaling conditions.
Table 1. Function Selection
OE# = 0:
Input
VP
0
0
1
1
OE# = 1:
Input
D+
0
0
1
1
X - Undefined
Output
VM
0
1
0
1
D+
0
0
1
1
D–
0
1
0
1
Output
D–
0
1
0
1
VP
0
0
1
1
VM
0
1
0
1
RCV
X
0
1
X
RCV
X
0
1
X
Result
SE0
Logic 0
Logic 1
Undefined
Result
SE0
Logic 0
Logic 1
Undefined
Table 2. Truth Table During Normal Mode
March 2010
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M9999-030810
MIC2551A-2.5
Micrel, Inc.
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
BUS
) .................................................. 6.5V
All Other Inputs ...............................................–0.5V to 5.5V
Ambient Storage Temperature.................. –65°C to +150°C
Output Current (D+, D–) .......................................... ± 50mA
Output Current (all others) ........................................ ±15mA
Input Current............................................................. ±50mA
ESD,
Note 3
V
BUS
, D+, D– .........................................................±15KV
All other pins ............................................................±2KV
Operating Ratings
(Note 2)
Supply Voltage (V
BUS
) ...................................4.0V to 5.25V
Ambient Operating Temperature ................ –40°C to +85°C
Package Thermal Resistance
MLF
®
(θ
JA
) .........................................................59(°C/W)
DC Electrical Characteristics (System and USB Interface)
(Note 6)
Symbol
V
BUS
V
IF
V
IL
V
IH
V
OH
V
OL
I
IL
Symbol
Parameter
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
Parameter
SPD
1
1
0
I
IF
VIF Supply Current
0
0
1
SUS
0
0
0
0
1
0
OE#
1
0
1
0
0
0
VBUS = 5.25V
VIF = 3.6V
f = 6MHz
CLOAD = 50pF,
Note 6
f = 750MHz
CLOAD = 600pF,
Note 6
Conditions
Voltage
Load
I
OH
= 20µA
I
OL
= 20µA
Conditions
V
IF
= 3.6V, V
BUS
= 5V unless otherwise noted; T
A
= 25°C.
Bold
indicates specifications over temperature, -40°C to 85°C.
Min
4.0
1.6
V
IF
-0.3
0.85V
IF
0.9V
IF
0.1
-5
Min
Typ
5
Max
Typ
Max
5.25
3.6
0.15V
IF
V
IF
+0.3
Units
V
V
V
V
V
V
µA
Units
1
5
µA
325
650
µA
0
1
1
0
I
VBUS
VBUS Supply Current
0
0
1
0
0
0
0
0
1
0
0
1
0
1
0
0
0
VBUS = 5.25V
VIF = 3.6V
40
800
3000
230
400
130
75
1100
5000
350
700
200
10
µA
µA
µA
µA
µA
µA
mA
f = 6MHz
CLOAD = 50pF,
Note 6
f = 750MHz
CLOAD = 600pF,
Note 6
Min
-5
-5
3.0
7.3
0
Symbol
I
VPULEAK
I
VIFLEAK
V
PU
R
SW
Parameter
VPU Leakage Current
VIF Leakage Current
Pull-Up Output Voltage
Internal Pull-Up Termination
0
0
Conditions
CON = 1, V
PU
= 0V
V
IF
= 3.6V, V
BUS
= 0V
3.6
Typ
5
Max
5
5
mA
Units
µA
µA
V
Ω
I
TERM
= 200µA, V
BUS
= 4.0 to 5.25V
I
TERM
= 10mA, V
BUS
= 4.0 to 5.25V
3.3
10
3.6
M9999-030810
4
March 2010
MIC2551A-2.5
Symbol
Parameter
Conditions
10 pulses
10 pulses
Min
Typ
±15
±15
Max
ESD Protection
IEC-1000-4-2 Air Discharge
(D+, D-, V
BUS
Contact Discharge
only)
Leakage Current
I
LO
Input Levels
V
DI
V
CM
V
SE
Output Levels
V
OL
V
OH
Capacitance
C
IN
Z
RDV
Transceiver Capacitance
Driver Output Resistance
Pin to GND
Steady-state drive
8
10
16
24
Static Output Low
Static Output High
R
L
= 1.5kΩ to 3.6V
R
L
= 1.5kΩ to GND
2.8
0.3
3.6
Differential Input Sensitivity
Differential Common Mode Range
Single-Ended Receiver Threshold
Receiver Hysteresis
|(D+) - (D-)|
Includes V
DI
range
0.2
0.8
0.8
200
2.5
2.0
Hi-Z State Data Line Leakage
(Suspend Mode)
0V < V
IN
< 3.3V, SUS = 1
-10
10
Micrel, Inc.
Units
kV
kV
DC Electrical Characteristics (Transceiver)
(Note 6)
µA
V
V
V
mV
V
V
pF
Ω
AC Electrical Characteristics
(Notes 5)
Transition Rise Time
Transition Fall Time
Rise/Fall Time Matching
Output Signal Crossover Voltage
Transition Rise Time
Transition Fall Time
Rise/Fall Time Matching
Output Signal Crossover Voltage
OE# to RCVR Tri-State Delay
Receiver Tri-State to Transmit
Delay
OE# to DRVR Tri-State Delay
Driver Tri-State to Receiver Delay
VP, VM to D+, D- Propagation
Delay
D+, D- to RCV Propagation Delay
D+, D- to VP, VM Propagation
Delay
Figure 1
Figure 1
Figure 1
Figure 1
Figure 4
Figure 3
Figure 3
15
15
15
8
15
15
C
L
= 50pF, Figure 2
C
L
= 50pF, Figure 2
(T
R
, T
F
)
C
L
= 50pF, Figure 2
C
L
= 600pF
C
L
= 50pF, Figure 2
C
L
= 600pF
(T
R
, T
F
)
75
75
80
1.3
4
4
90
1.3
300
300
125
2.0
20
20
111.11
2.0
15
ns
ns
%
V
ns
ns
%
V
ns
ns
ns
ns
ns
ns
ns
Driver Characteristics (Low Speed)
T
R
T
F
T
R
, T
F
V
CRS
T
R
T
F
T
R
, T
F
V
CRS
t
PVZ
t
PZD
t
PDZ
t
PZV
t
PLH
t
PHL
t
PLH
t
PH
L
t
PLH
t
PHL
Driver Characteristics (Full Speed)
Transceiver Timing
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
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. Human body model, 1.5k in series with 100pF.
Specification applies to the following pins: SUS, SPD, CON, RCV, VP, VM, OE#.
All AC parameters guaranteed by design but not production tested.
Specification for packaged product only.
March 2010
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M9999-030810
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