DP83257VF National Semiconductor, DP83257VF Datasheet - Page 120

• Manufacturer Part Number: DP83257VF
• Description: IC FDDI LAYER CTRLR 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83257VF

• Controller Type: physical layer controller
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-BFQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Interface: -
• Other names: *DP83257VF

7 0 Electrical Characteristics
AC Characteristics for the PMD Interface
The following signals are covered PMD Indicate Data (PMID) Signal Detect (SD) and PMD Request Data (PMRD)
Note 1 This only applies when the Alternate PMD Interface is disabled APMDREG APMDEN
Note 2 This parameter is not tested but is assured by correlation with characterization data
Symbol
T36
T37
T38
T39
PMID
SD Minimum Pulse Width
PMRD Rise Time
PMRD Fall Time
g
to PMRD
Parameter
g
Latency
FIGURE 7-10 Primary PMD Timing Diagrams
(Continued)
Looped Back through
Configuration Switch
LBC1
In Lock
(Note 1)
(Note 2)
(Note 2)
Conditions
e
120
12 5 MHz
e
0
Min
120
Typ
5
TL F 11708– 36
Max
1 5
1 5
Cycles
Units
LBC
ns
ns
ns