ICS1893CY-10LFT IDT, Integrated Device Technology Inc, ICS1893CY-10LFT Datasheet - Page 31

• Manufacturer Part Number: ICS1893CY-10LFT
• Description: PHYCEIVER LOW PWR 3.3V 64-TQFP
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: PHYceiver™r
• Type: PHY Transceiverr

Specifications of ICS1893CY-10LFT

• Protocol: MII
• Voltage - Supply: 3.14 V ~ 3.47 V
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Drivers/receivers: -
• Other names: 1893CY-10LFT

5.6 Clock Reference Interface
ICS1893CY-10 Rev 1/07
Oscillator
The REF_IN pin provides the ICS1893CY-10 Clock Reference Interface. The ICS1893CY-10 requires a
single clock reference with a frequency of 25 MHz ±50 parts per million. This accuracy is necessary to meet
the interface requirements of the ISO/IEEE 8802-3 standard, specifically clauses 22.2.2.1 and 24.2.3.4.
The ICS1893CY-10 supports two clock source configurations: a CMOS oscillator or a CMOS driver. The
input to REF_IN is CMOS (10% to 90% VDD), not TTL. Alternately, a 25MHz crystal may be used. The
Oscillator specifications are shown in Table 5.4.
Figure 5-2. Crystal or Oscillator Operation
Crystal
ICS1893CY-10 - Release
33 pF
CMOS
25.000
MHz
REF_OUT
REF_OUT
52
NC
52
25.000MHz
33 Ohm
Copyright © 2007, Integrated Device Technology, Inc.
REF_IN
REF_IN
All rights reserved.
53
53
31
33 pF
10 pF
Chapter 5 Interface Overviews