Features: • IEEE 802.3u D5 repeater and management compatible
• Support 5 TX/FX ports
• Support 8-scale utilization and collision rate LED display
• Asynchronous Expansion port clock supported for easily stackable application
• Separate jabber and partition state machines for each port
• On-chip elasticity buffer for PHY signal re-timing to the MX98746 clock source
• Contents of internal register loaded from EEPROM
• CMOS device features high integration and low power with a signle +5V supply
• 128-PIN PQFP
Pinout
Specifications
|
RATING |
VALUE |
| Supply Voltage (VCC) |
4.75V to 5.25V |
| DC Input Voltage (Vin) |
-0.5V to VCC+ 0.5V |
| DC Output Voltage (Vout) |
-0.5V to VCC+ 0.5V |
| Storage Temperature Range (TSTG) |
-55 to 150 |
| Operating Temperature Range |
0 °C to 70 °C |
| Power Dissipation (PD) |
750 mW |
| ESD rating (Rzap = 1.5K, Czap = 100pF) |
2000V |
Notice : Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cauase permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended period may affect reliability.
DescriptionThe MX98746, Second generation 100 Mb/s TX/FX Hub Controller, is designed specifically to meet the needs of today's high speed Fast Ethernet networking systems.The MX98746 is fully IEEE 802.3u D5 clause 27 repeater compatible. Difference from MX98741 and MX98745, MX98746 support 5 dedicated TX/FX ports.
All contents of internal registers are loaded from EEPROM in MX98746. If system application prefers default setting instead of using contents from EEPROM, EEPROM operation can be disabled by setting EECONF to low. This feature faciliates system modulization application.
8 scale of utilization and collision rate LED are also provided by MX98746. They are 1%, 3%, 5%, 10%, 20%,40%, 60% and 80+% for network utilization, and 1%,3%, 5%, 8%, 10%, 13%, 15% and 20+% for collision rate. The defination for utiliztion is Mbs Received/100 Mb within one second sampling period. Meanwhile, RX/LINK, Partition, Isolation and Collision status are also provided through LED display.
A great improvement in MX98746 (compared to MX98741) is that it also provides "asynchronous expansion port data transfer mode" to make stackable design more easier.
MX98746 Data Sheet
