CS8900A-CQ3Z Cirrus Logic Inc, CS8900A-CQ3Z Datasheet - Page 121

• Manufacturer Part Number: CS8900A-CQ3Z
• Description: IC LAN ETHERNET CTLR 3V 100LQFP
• Manufacturer: Cirrus Logic Inc
• Type: Single Chipr

Specifications of CS8900A-CQ3Z

• Package / Case: 100-LQFP
• Controller Type: Ethernet Controller (IEEE 802.3)
• Interface: ISA-BUS
• Voltage - Supply: 3V, 5V
• Current - Supply: 95mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Ethernet Connection Type: 10BASE- 2 or 10BASE- 5 or 10BASE- F or 10BASE- T
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Product: Ethernet Controllers
• Standard Supported: IEEE 802.3
• Data Rate: 10 Mbps
• Supply Voltage (max): 6 V
• Supply Voltage (min): - 0.3 V
• Supply Current (max): +/- 10 mA
• Maximum Operating Temperature: + 70 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1163 - KIT EVAL FOR CS8900A
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 598-1127

DS271F5
7.5 10BASE-T WIRING
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CS8900A
Crystal LAN™ Ethernet Controller
CS8900A
If a center tap transformer is used on the RXD+ and RXD- inputs, replace the pair of Rr re-
sistors with a single 2xRr resistor.
The Rt and Rr resistors are ±1% tolerance.
The CS8900A supports 100, 120, and 150 Ω unshielded twisted pair cables. The proper val-
ues of Rt and Rr, for a given cable impedance, are shown below:
Note: for 3.3V operation the turns ratio on TXD+ and TXD- is 1:2.5, rt is 8
and the 68pF cap changes to 560pF.
+
-
TXD +
TXD -
RXD+
RXD-
Cable Impedance (Ω)
Rt
Rt
0.01 μ F
100
120
150
CIRRUS LOGIC PRODUCT DATASHEET
0.01 μ F
68 pF
Rr
Rr
Rt (Ω)
24.3
30.1
37.4
1 :
1 : 1
2
RD +
Rr (Ω)
TD +
RD -
TD -
49.9
60.4
75
1
2
3
6
Ω
for 100
RJ45
Ω
cable
121