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LXT9883/9863 — Advanced 10/100 Unmanaged Repeater

Datasheet

Document #: 249115

Revision #: 003

Rev. Date: 08/07/01

Figure 24. 10 Mbps TP-to-IRB Timing

Table 33. 10 Mbps TP-to-IRB Timing Parameters

Parameter

Symbol

Min

Typ

Max

Units

Test Conditions

TPIP/N to IR10ENA Low

t13A

5.1

–

IR10CLK rising edge to

IR10DAT rising edge.

t13B

330

Ω pull-up, 150pF load on IR10DAT.

1 k

Ω pull-up, 150pF load on IRCLK.

IR10CLK rising edge to

IR10DAT falling edge.

t13C

1. This table contains propagation delays from the TP ports to the IRB for normal repeater operation. All values in this table are

output timings.

2. There is a delay of approximately 13 to 16 bit times between the assertion of IR10ENA and the assertion of IR10CLK and

IR10DAT. This delay does not affect repeater operation because downstream devices begin generating preamble as soon as

IR10ENA is asserted.

3. Typical values are at 25 °C and are for design aid only; not guaranteed and not subject to production testing.

4. Bit Time (BT) is the duration of one bit as transferred to/from the MAC and is the reciprocal of bit rate. BT for

10BASE-T = 10

-7 s or 100ns.

TPIP/N

IR10ENA

IR10DAT

t13A

t13B

IR10CLK

t13C

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