MIC2550 Datasheet, PDF (2/8 Pages) Micrel Semiconductor – Universal Serial Bus Transceiver Advance Information

MIC2550
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)
Micrel
Pin Description
Pin Number
1
2
3
4
5
6, 13
7
8
9
10
11
12
14
Pin Name
VIF
SPD
RCV
VP
VM
NC
GND
SUS
OE#
D–
D+
VTRM
VBUS
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.
MIC2550
2
October 4, 1999