MIC2551A-2.5 Datasheet, PDF (2/10 Pages) Micrel Semiconductor – USB Transceiver

MIC2551A-2.5
Pin Configuration
14 13 12 11
RCV 1
10
VTRM
VP 2
9 D+
VM 3
8 D-
45 67
Micrel, Inc.
14-Pin MLF™ (ML)
Pin Description
Pin Number
1
2
3
4
Pin Name
RCV
VP
VM
CON
5
GND
6
SUS
7
OE#
8
D-
9
D+
10
VTRM
11
VPU
12
VBUS
13
VIF
14
SPD
I/O Pin Description
O Receive Data: Output for USB differential data.
I/O If OE# = 1, VP = Receive output (+) If OE# = 0, VP = Driver input (+).
I/O If OE# = 1, VM = Receive output (-) If OE# = 0, VM = Driver input (-).
I CONNECT (Input): Controls state of VPU. Refer to VPU pin description
for detail.
Ground Reference.
I Suspend: Active-High. Turns off internal circuits to reduce supply
current.
I Output Enable: Active-Low. Enables the transceiver to transmit data
onto the bus. When inactive, the trasceiver is in the receive mode.
I/O Differential data lines conforming to the USB standard.
O 3.3V Reference Supply Output: Requires a minimum 0.1µF decoupling
capacitor for stability. A 1µF capacitor is recommended.
O 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.
I USB Bus Supply Voltage: Used to power USB transceiver and internal
circuitry.
I System Interface Supply Voltage: Used to provide reference supply
voltage for system I/O interface signaling.
I Edge Rate Control: A logic HIGH operates at edge rates for "full speed"
operation. A logic LOW operates edge rates for "low-speed" operation.
M9999-031306
2
March 2006