MIC2537-1YM TR Micrel Inc, MIC2537-1YM TR Datasheet - Page 10

• Manufacturer Part Number: MIC2537-1YM TR
• Description: Quad USB Switch ( )
• Manufacturer: Micrel Inc
• Type: USB Switchr

Specifications of MIC2537-1YM TR

• Number Of Outputs: 4
• Rds (on): 700 mOhm
• Internal Switch(s): Yes
• Current Limit: 250mA
• Voltage - Input: 3 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MIC2537-1YMTR; MIC2537-1YMTR

MIC2537
USB Voltage Regulation
USB specifications require a minimum downstream voltage
supply of 4.40V from a bus-powered hub port (See Applica-
tion Note 17 for details). The USB specification allows for a
100mV drop across the hub, leaving 250mV for PCB, up-
stream cable, and connector resistance. Therefore, the on-
resistance of the switch for each port, not including PCB
resistance, must be about 100mV
MIC2537 has a maximum on-resistance of 700m , which
easily satisfies this requirement.
December 1999
100mA = 1 . The
10
Overcurrent Indication
The USB Specification does not require bus-powered hubs to
report overcurrent conditions to the host since the hub is
already current-limited at the upstream port. However, if it is
desired to report overcurrent, the Hub Descriptor Status
Register must be programmed to indicate this. The MIC2537
provides a flag output for this application.
MIC2537
Micrel