KS8721B Micrel Inc, KS8721B Datasheet - Page 24

• Manufacturer Part Number: KS8721B
• Description: Special Function IC
• Manufacturer: Micrel Inc
• Type: Transceiverr

Specifications of KS8721B

• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Number Of Drivers/receivers: 1/1
• Protocol: MII, RMII
• Voltage - Supply: 2.375 V ~ 2.625 V
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: 576-1006 - BOARD EVAL EXPERIMENT KS8721B
• Lead Free Status / RoHS Status: Not Compliant, Contains lead / RoHS non-compliant

KS8721B/BT
Timing Diagrams
Symbol
t
t
t
t
t
t
t
t
t
M9999-041405
SU1
SU2
HD1
HD2
CRS1
CRS2
LAT
SQE
SQEP
Parameter
TXD [3:0] Set-Up to TXC High
TXEN Set-Up to TXC High
TXD [3:0] Hold After TXC High
TXEN Hold After TXC High
TXEN High to CRS Asserted Latency
TXEN Low to CRS De-Asserted Latency
TXEN High to TXP/TXM Output (TX Latency)
COL (SQE) Delay Aftter TXEN Ae-Asserted
COL (SQE) Pulse Duration
SQE Timing
TXC
TXEN
TXD[3:0]
CRS
TXP/TXM
TXC
TXEN
COL
Table 2. 10BaseT MII Transmit Timing Parameters
t
SU2
t
SU1
Figure 4. 10BaseT MII Transmit Timing
t
LAT
t
CRS1
t
SQE
t
HD2
t
HD1
Valid
Data
24
t
SQEP
t
CRS2
Min
10
10
0
0
Typ
2.5
1.0
4
8
4
Max
Micrel, Inc.
April 2005
Units
BT
BT
BT
ns
ns
ns
ns
µs
µs