ICS1894-34
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH MII INTERFACE PHYCEIVER
IDT®
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH MII INTERFACE 28
ICS1894-34 REV B 052112
DC and AC Operating Conditions
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS1894-34. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Recommended Operating Conditions
Parameter Rating
VDD (measured to VSS) -0.3 V to 3.6V
Digital Inputs / Outputs -0.3 V to VDD +0.3 V
Storage Temperature -55° C to +150° C
Junction Temperature 125° C
Soldering Temperature 260° C
Power Dissipation See section “DC Operating Conditions for Supply Current”
Parameter Symbol Min. Max. Units
Ambient Operating Temperature - Commercial T
A
0+70°C
Ambient Operating Temperature - Industrial T
A
-40 +85 ° C
Power Supply Voltage (measured to VSS) VDD +3.14 +3.47 V
ICS1894-34
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH MII INTERFACE PHYCEIVER
IDT®
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH MII INTERFACE 29
ICS1894-34 REV B 052112
Recommended Component Values
ICS1894-34 TCSR
Parameter Minimum Typical Maximum Tolerance Units
TCSR Resistor Value 1.91kΩ to GND
18.7kΩ to VDD
–1%Ω
LED Resistor Value 1k Ω
Note:
1. The bias resistor network sets the 10baseT and 100baseTX output amplitude levels.
2. Amplitude is directly related to current sourced out of the TCSR pin.
3. Resistor values shown above are typical. User should check amplitudes and adjust for transformer effects.
4. The 18.7KΩ resistor provides negative feedback to compensate for VDD changes. Reducing the value of
this resistor will lower the 100baseT amplitude. Reducing the value of the resistor to ground on the other
hand will increase the output signal amplitude.
ICS1894-34
78
VDD TCSR
VDD
18.7KΩ 1%
1.91KΩ 1%
ICS1894-34
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH MII INTERFACE PHYCEIVER
IDT®
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH MII INTERFACE 30
ICS1894-34 REV B 052112
DC Operating Characteristics for Supply Current
The table below lists the DC operating characteristics for the supply current to the ICS1894-34 under various
conditions.
Deep Power Down Current Consumption Table
Condition VDDIO (V) VDD and VDDD (V) Current (mA) (typical)
Autonegotiation 3.3 3.3 68
1.8 3.3 66
100BaseTX FD and Linked 3.3 3.3 102
10BaseTX FD and Linked 3.3 3.3 97
Power Down (Reg0:11 = 1) 3.3 3.3 16
Case 1 Case 2 Case 3 Case 4 Case 5
Register 24:8 DPD Enable
Register 24:7 TPLL_100 DPD Enable
Register 24:6 RX_100 DPD Enable
Register 24:5 Admix_TX DPD Enable
Register 24:4 CDR100_cdr DPD Enable
Current (mA) (typical) 68 39 26 24 16

1894K-34LFT

Mfr. #:
Manufacturer:
IDT
Description:
Ethernet ICs 3.3V 10/100 PHY RMII
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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