78Q2123/F1 Maxim Integrated, 78Q2123/F1 Datasheet - Page 29

• Manufacturer Part Number: 78Q2123/F1
• Description: Ethernet ICs
• Manufacturer: Maxim Integrated

Specifications of 78Q2123/F1

• Rohs: yes

802.3.
DS_21x3_001
4.6.3 100BASE-TX System Timing
System timing requirements for 100BASE-TX operation are listed in Table 24-2 of Clause 24 of IEEE
4.6.4 10BASE-T System Timing
* Guarantee by design. The specifications in the following table are included for information only.
Rev. 1.6
Parameter
TX_EN Sampled to first bit of “J” on MDI
output
First bit of “J” on MDI input to CRS assert
First bit of “T” on MDI input to CRS
de-assert
First bit of “J” on MDI input to COL assert
First bit of “T” on MDI input to COL
de-assert
TX_EN Sampled to CRS assert
TX_EN sampled to CRS de-assert
Parameter
TX_EN (MII) to TD Delay
RD to RXD at (MII) Delay
Collision delay
SQE test wait
SQE test duration
Jabber on-time*
Jabber off-time*
Condition
RPTR = low
RPTR = low
Condition
Min
250
20
78Q2123/78Q2133 Data Sheet
Nom
1
1
Nom
12
16
23
20
24
6
6
Max
150
750
6
6
9
Unit
BT
BT
BT
BT
BT
BT
BT
Unit
ms
ms
BT
BT
BT
µs
µs
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