ICS1893BFIT IDT, Integrated Device Technology Inc, ICS1893BFIT Datasheet - Page 107

• Manufacturer Part Number: ICS1893BFIT
• Description: PHYCEIVER LOW PWR 3.3V 48-SSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: PHYceiver™r
• Type: PHY Transceiverr

Specifications of ICS1893BFIT

• Protocol: MII
• Voltage - Supply: 3.14 V ~ 3.47 V
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Drivers/receivers: -
• Lead Free Status / RoHS Status: Not Compliant, Contains lead / RoHS non-compliant
• Other names: 1893BFIT

9.3 Recommended Component Values
ICS1893BF, Rev. F, 5/13/10
VDD
Note:
1. The bias resistor networks set the 10baseT and 100baseTX output amplitude levels.
2. Amplitude is directly related to current sourced out of the 10TCSR and 100TCSR pins.
3. Resistor values shown above are typical. User should check amplitudes and adjust for transformer.
4. The VDD connection to the 12.1K resistor can connect to any VDD. The 12.1K resistor provides
5. The ICS1893BF 10baseT amplitude is below the IEEE spec but is adequate for 200m operation. This
Typical Board Layouts
10TCSR and 100TCSR Bias Resistors
Table 9-3. Recommended Component Values for ICS1893BF
† There are two IEEE Std. 802.3 requirements that drive the tolerance for the frequency of the oscillator.
Figure 9-1. ICS1893BF 10TCSR and 100TCSR
Oscillator Frequency
10TCSR Resistor Value
100TCSR Resistor Value
LED Resistor Value
negative feedback to compensate for VDD changes. Lowering the 12.1K value will lower the
100baseT amplitude.
is the effect of additional MUXes added for the Auto-MDIX function.
•
•
Clause 22.2.2.1 requires the MII TX_CLK to have an accuracy of ± 100 ppm.
Clause 24.2.3.4 is more stringent. It requires the code-bit timer to have an accuracy of 0.005% (that is, ±50 ppm).
ICS1893BF Data Sheet Rev. F - Release
18
VDD
Parameter
2.0KΩ 1%
10TCSR
Minimum
510
–
–
–
10TCSR
19
ICS1893BF
Copyright © 2009, IDT, Inc.
See
All rights reserved.
Typical
2.00k
Figure 9-1
107
25
1k
12.1 KΩ 1%
1.54KΩ 1%
100TCSR
Maximum
10k
–
–
–
Chapter 9 DC and AC Operating Conditions
100TCSR
20
± 50 ppm †
Tolerance
1%
1%
–
Units
MHz
May, 2010
Ω
Ω
Ω