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
MICREL [ MICREL SEMICONDUCTOR ]
