MIC2551A_11 Datasheet, PDF (2/11 Pages) Micrel Semiconductor – USB Transceiver

MIC2551A
Pin Configuration
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
Micrel, Inc.
16 15 14 13
SPD ¹
12 _VTRM
RCV 2
11 _D+
VP 3
10 D–
VM 4
9 OE#
5678
16-Pin MLF^® (ML)
Pin Description
Pin Number Pin Number
MIC2551ABTS MIC2551ABML
1
15
Pin Name
VIF
2
1
SPD
3
2
4
3
5
4
6
5
7
6
8
7
9
9
RCV*
VP*
VM*
CON
GND
SUS
OE#*
10/11
12
10/11
12
D–, D+*
VTRM
13
13
VPU
14
14
VBUS
8,16
NC
* See Table 1 for description of logic states.
M9999-112008
I/O Pin Function
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.
O
Receive Data: Output for USB differential data.
I/O If OE# = 1, VP = Receiver output (+)
If OE# = 0, VP = Driver input (+)
I/O If OE# = 1 VM, = Receiver 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 transceiver 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 recom-
mended
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.
No connect.
2
November 2008