USB97C100QFP datasheet(7/64 Pages) SMSC

7 / 64 page

SMSC DS – USB97C100

Page 7

Rev. 01/03/2001

QFP PIN

NUMBER

SYMBOL

PIN DESCRIPTION

BUFFER

TYPE

PWRGD

Active high input.

This signal is used to indicate to that chip that a good power

level has been reached. When inactive/low, all pins are Tri-

stated except TST_OUT and a POR is generated.

RESET_IN

Power on reset; active high

This signal is used by the system to reset the chip. It also

generates an internal POR.

TST_OUT

AND tree output

This signal is used for testing the chip via an internal AND tree.

nTEST

Test input

This signal is a manufacturing test pin. User can pull it high or

leave it unconnected.

[96:81]

No connect

BUFFER TYPE DESCRIPTIONS

Table 2 - USB97C100 Buffer Type Description

BUFFER

DESCRIPTION

Input (no pull-up)

Input 90µA with internal pull-up

Output with 8mA drive

I/O8

Input/output with 8mA drive

I/O16

Input/output with 16mA drive

O24

Output, 24mA sink, 12mA source.

I/ODP24

Input/Output drain , 24mA sink, 12mA source with 90µA pull-up

ICLKx

XTAL clock input

OCLKx

XTAL clock output

ICLK

Clock input (TTL levels)

I/O-U

Defined in USB specification; uses VCC3.3

Note: These DC Characteristics/drive strengths apply to 5V operation only. See the DC Characteristics section for

additional details.

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