MIC2551A
Micrel, Inc.
MIC2551A
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, which ease 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 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 2.0 for full
speed (12Mbs) and low speed (1.5Mbps) operation
• Compliant to IEC-61000-4.2 (Level 3)
• 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
• Small TSSOP and MLF
®
packages
• No power supply sequencing requirements
• Software controlled re-enumeration
Applications
• PDAs
• Palmtops
• Cell phones
Ordering Information
Part Number
Standard
Pb-Free
MIC2551ABTS
MIC2551ABML
MIC2551AYTS
MIC2551AYML
Package
14-Pin TSSOP
16-Pin MLF
®
Typical Application
System
Supply Voltage
VCC GPIO
MIC2551A
VIF
CON
OE#
RCV
VP
VM
SPD
SUS
GND
VTRM
VBUS
VPU
V
BUS
R
S
20Ω/±1%
USB SIE
Controller
1.5k
D+
D–
D+
D–
GND
USB
Port
R
S
20Ω/±1%
1.0µF (min)
10µF (max)
1µF
41206ESDA SurgX
(See “Applications Information”
for additional suppliers.)
Typical Application Circuit
Micro
LeadFrame and MLF are registered trademarks of Amkor Technology.
SurgX is a registered trademark of Cooper Electronics Technologies.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
November 2008
1
M9999-112008
MIC2551A
Micrel, Inc.
Pin Configuration
NC
VIF
VBUS
VPU
16 15 14 13
SPD
RCV
VP
VM
1
2
3
4
5 6 7 8
CON
GND
SUS
NC
12
11
10
9
VTRM
D+
D–
OE#
VIF 1
SPD 2
RCV 3
VP 4
VM 5
CON 6
GND 7
14 VBUS
13 VPU
12 VTRM
11 D+
10 D-
9 OE#
8 SUS
14-Pin TSSOP
16-Pin MLF
®
(ML)
Pin Description
Pin Number
Pin Number
MIC2551ABTS MIC2551ABML
1
2
15
1
Pin Name
VIF
SPD
I/O
I
I
Pin Function
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.
Receive Data: Output for USB differential data.
If OE# = 1, VP = Receiver output (+)
If OE# = 0, VP = Driver input (+)
If OE# = 1 VM, = Receiver output (-)
If OE# = 0, VM = Driver input (-)
CONNECT (Input): Controls state of VPU. Refer to VPU pin
description for detail.
Ground Reference.
I
I
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 transceiver 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 recom-
mended
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.
No connect.
3
4
5
6
7
8
9
2
3
4
5
6
7
9
RCV*
VP*
VM*
CON
GND
SUS
OE#*
O
I/O
I/O
I
10/11
12
10/11
12
D–, D+*
VTRM
I/O
O
13
13
VPU
O
14
14
8,16
VBUS
NC
I
* See Table 1 for description of logic states.
M9999-112008
2
November 2008
MIC2551A
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
RCV
X
0
1
X
Result
SE0
Logic 0
Logic 1
Undefined
Output
D-
0
1
0
1
VP
0
0
1
1
VM
0
1
0
1
RCV
X
0
1
X
Result
SE0
Logic 0
Logic 1
Undefined
Table 2. Truth Table During Normal Mode
November 2008
3
M9999-112008
MIC2551A
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– ........................................................
±11KV
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
TSSOP (θ
JA
) .................................................. 100(°C/W)
MLF
®
(θ
JA
) ....................................................... 59(°C/W)
DC Electrical Characteristics (System and USB Interface)
(Note 7)
V
IF
= 3.6V, V
BUS
= 5V unless otherwise noted; T
A
= 25°C.
Bold
indicates specifications over temperature, –40°C to 85°C.
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
= 50 pF,
Note 7
f = 750kHz
CLOAD = 600 pF
Note 7
Conditions
Voltage
Load
1
1
1
1
1
325
5
5
5
5
5
650
µA
µA
µA
µA
µA
µA
I
OH
= 20µA
I
OL
= 20µA
–5
Min
Typ
Conditions
Min
4.0
1.6
V
IF
–0.3
0.85V
IF
0.9V
IF
0.1
5
Max
Typ
Max
5.25
3.6
0.15V
IF
V
IF
+0.3
Units
V
V
V
V
V
V
µA
Units
0
1
1
0
0
I
VBUS
VBUS Supply Current
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
= 50 pF,
Note 7
f = 750kHz
CLOAD = 600 pF
Note 7
–5
–5
3.0
7.3
0
I
VPULEAK
I
VIFLEAK
V
PU
R
SW
VPU Leakage Current
VIF Leakage Current
Pull-Up Output Voltage
Internal Pull-Up Termination
0
0
CON = 1, V
PU
= 0V
V
IF
= 3.6V, V
BUS
= 0V
3.6
5
5
5
mA
µA
µA
V
Ω
kV
kV
I
TERM
= 200µA, V
BUS
= 4.0 to 5.25V
I
TERM
= 10mA, V
BUS
= 4.0 to 5.25V
10 pulses
10 pulses
3.3
10
3.6
ESD Protection
IEC-1000-4-2 Air Discharge
(D+, D–,
V
BUS
only)
M9999-112008
±8
±9
Contact Discharge
4
November 2008
MIC2551A
Micrel, Inc.
DC Electrical Characteristics (Transceiver)
(Note 7)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Leakage Current
I
LO
Input Levels
V
DI
V
CM
V
SE
Output Levels
V
OL
V
OH
Capacitance
C
IN
Z
DRV
Transceiver Capacitance
Driver Output Resistance
Pin to GND
Steady state drive
8
10
16
24
pF
Ω
Static Output Low
Static Output High
R
L
= 1.5kΩ to 3.6V
R
L
= 15kΩ to GND
2.8
0.3
3.6
V
V
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
V
V
V
mV
Hi-Z State Data Line Leakage
(Suspend Mode)
0V < V
IN
< 3.3V, SUS = 1
–10
10
µA
AC Electrical Characteristics
(Notes 6, 7)
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
PHL
t
PLH
t
PHL
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Transition Rise Time
Transition Fall Time
Rise/Fall Time Matching
Output Signal Crossover Voltage
C
L
= 50pF, Figure 2
C
L
= 600pF
C
L
= 50pF, Figure 2
C
L
= 600pF
(T
R
, T
F
)
75
300
75
300
80
1.3
125
2.0
ns
ns
%
V
Driver Characteristics (Full Speed)
Transition Rise Time
Transition Fall Time
Rise/Fall Time Matching
Output Signal Crossover Voltage
C
L
= 50pF, Figure 2
C
L
= 50pF, Figure 2
(T
R
, T
F
)
4
4
90
1.3
20
20
111.11
2.0
ns
ns
%
V
Transceiver Timing
OE# to RCVR Tri-State Delay
Receiver Tri-State to Transmit Delay
OE# to DRVR Tri-State Delay
Driver Tri-State to Receive Delay
VP, VM to D+, D– Propagation Delay
D+, D– to RCV Propagation Delay
D+, D– to V
P
, V
M
Propagation Delay
Figure 1
Figure 1
Figure 1
Figure 1
Figure 4
Figure 3
Figure 3
15
15
15
8
15
15
15
ns
ns
ns
ns
ns
ns
ns
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, RCV, CON, RCV, VP, VM, OE#.
Characterized specification(s), but not production tested.
All AC parameters guaranteed by design but not production tested.
Specification for packaged product only.
November 2008
5
M9999-112008
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