1893AFLF IDT, 1893AFLF Datasheet - Page 29

• Manufacturer Part Number: 1893AFLF
• Description: Ethernet ICs 3.3V 10/100 BASE TX INTEGRATED PHYCEIVER
• Manufacturer: IDT
• Type: Integrated PHY Transceiverr

Specifications of 1893AFLF

• Rohs: yes
• Product: Ethernet Transceivers
• Data Rate: 10 Mb/s, 100 Mb/s
• Supply Voltage - Max: 3.47 V
• Supply Voltage - Min: 3.14 V
• Maximum Operating Temperature: + 70 C
• Package / Case: SSOP-48
• Ethernet Connection Type: 100Base-TX, 10Base-T
• Maximum Supply Current: 160 mA
• Minimum Operating Temperature: 0 C
• Standard Supported: 802.3
• Part # Aliases: ICS1893AFLF

6.4 Clock Reference Interface
ICS1893AF, Rev. D 10/26/04
Oscillator
The REF_IN pin provides the ICS1893AF Clock Reference Interface. The ICS1893AF 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
ICS1893AF 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 6.1.
Figure 6-3. Crystal or Oscillator Operation
Crystal
ICS1893AF Data Sheet - Release
33 pF
CMOS
25.000
MHz
REF_OUT
REF_OUT
46
NC
46
25.000MHz
33 Ohm
Copyright © 2004, Integrated Circuit Systems, Inc.
REF_IN
REF_IN
All rights reserved.
47
47
29
33 pF
10 pF
Chapter 6 Interface Overviews
October, 2004