CS8952-IQZ Cirrus Logic Inc, CS8952-IQZ Datasheet - Page 64

• Manufacturer Part Number: CS8952-IQZ
• Description: IC TXRX 100/10 PHY 100TQFP
• Manufacturer: Cirrus Logic Inc
• Type: Transceiverr

Specifications of CS8952-IQZ

• Package / Case: 100-TQFP, 100-VQFP
• Protocol: MII
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Product: Ethernet Transceivers
• Number Of Transceivers: 1
• Standard Supported: 100BASE-FX or 100BASE-TX or 10BASE-T
• Data Rate: 10 Mbps or 100 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
• Number Of Drivers/receivers: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 598-1208

plied through the XTAL_I pin, or using an external
clock source supplied through the TX_CLK pin.
When a 25 MHz crystal is used, it should be placed
within one inch of the XTAL_I and XTAL_O pins
of the CS8952. The crystal traces should be short,
have no vias, and run on the component side.
Table 7 lists examples of manufacturers of suitable
crystals. The designer should evaluate their crystal
selection for suitability in their specific design.
An external CMOS clock source may be connected
to the XTAL_I pin, with the XTAL_O pin left
open. The input capacitance of the XTAL_I pin is
larger than the other inputs (a maximum of 35pF),
since it includes the additional load capacitance of
the crystal oscillator. Care should be taken to as-
sure any external clock source attached to XTAL_I
is capable of driving higher capacitive loads. The
clock signal should be 25 MHz ±0.01% with a duty
cycle between 45% and 55%.
When the XTAL_I pin load is a problem, or only a
TTL level clock source is available, the CS8952
can be clocked through the TX_CLK pin, provid-
ing the TX_CLK mode is set appropriately using
the TCM pin. The clock frequency will be depen-
dent on the operating mode.
7.5
The CS8952 requires an isolation transformer with
a 1:1 turns ratio for both the transmit and receive
signals. Table 7 lists examples of manufacturers
CrystalLAN™ 100BASE-X and 10BASE-T Transceiver
DS206F1
Figure 8. Biasing Resistor Connection and Layout
Recommended Magnetics
CS8952
RES
VSS
VSS
87
86
85
4.99 k Ω
Via to
Ground Plane
with transformers meeting these requirements.
However, the designer should evaluate the magnet-
ics for suitability in their specific design.
7.6
The CS8952 supports connection to either a 3.3 V
or 5.0 V MII. When connected to a +5.0 V MII, all
power pins should be provided +5.0 V +/- 5%, and
all signal inputs should be referenced to +5.0V.
When interfaced with a 3.3 V MII, VDD_MII pow-
er pins should be provided +3.3 V +/- 5%, VDD
power pins should be provided +5.0 V +/- 5%, and
all signal inputs should be referenced to +3.3 V.
Crystal
Transformer
Fiber
Interface
Each CS8952 power pin should be connected to a
0.1 µF bypass capacitor and then to the power
plane. The bypass capacitors should be located as
close to its corresponding power pin as possible.
Connect ground pins directly to the ground plane.
Component
Table 7. Support Component Manufactures
Power Supply and Decoupling
Raltron Electronics Corp.
10651 NW 19th St.
Miami, FL 33172
[phone]
www.raltron.com
Halo Electronics, Inc.
P.O. Box 5826
Redwood City, CA 94063
USA
[phone]
www.haloelectronics.com
Bel Fuse, Inc.
198 Van Vorst Street
Jersey City, NJ 07302
USA
[phone]
www.belfuse.com
Pulse Engineering
12220 World Trade Drive
San Diego, CA 92128
USA
[phone]
www.pulseeng.com
Hewlett Packard
Component Sales
Response Center
[phone]
www.hp.com/HP-COMP
Manufacturer
AS-25.000-15-F-
EXT-SMD-TR-
CIR
TG22-3506ND
S5558-5999-46
PE-68515
HFBR-5103
Part Number
CS8952
64