dp83223 National Semiconductor Corporation, dp83223 Datasheet - Page 10

• Manufacturer Part Number: dp83223
• Description: Dp83223 Twister High Speed Networking Transceiver Device
• Manufacturer: National Semiconductor Corporation

4.0 DC and AC Specifications
Note 1:Guaranteed by characterization over process, temperature, and Vcc.
Note 2:It is recommended that the CDET control input be tied directly to Vcc or GND to ensure proper operation. If CDET is to be driven from a gate, it is
recommended that the gate be capable of true CMOS logic levels.
Note 3:The median voltage level for EQSEL is normally accomplished by floating that pin.
Note 4:ICC is a measure of total device current in normal MLT-3 mode with a 125Mb/s random data pattern applied to the PMRD+/- inputs to allow the
TXO+/- outputs to switch at a nominal 2V pk-pk differential amplitude into a standard 50 differential load. ICC is minus the current through the PECL inputs.
Device configuration: LBEN=0, CDET=0, ENCSEL=0, EQSEL=float, PMRD+/-=125Mb/s data, RXI+/-=125Mb/s data.
Note 5:ICC does not include the current through the PECL outputs. Standard 50 Thevenin equivalent PECL terminations (figure 10) require approximately
14 mA per pin, or a total of 56 mA. 100 PECL terminations require approximately 7 mA per pin, or a total of 28 mA. These external PECL termination current
requirements should be considered when analyzing system power requirements.
Note 6:TXO output current is a measure of the total differential current present at the TXO+/- outputs into a standard 50 differential load. Device configu-
ration: R
Note 7:I
Device configuration: R
Note 8:Signal Detect Assert Threshold is a measure of the pk-pk differential signal amplitude at the RXI+/- inputs of the RJ45 required to cause the Signal
Detect differential output to assert. Device configuration: LBEN=0, CDET=0, ENCSEL=0, EQSEL=float, PMRD+/-=static, RXI+/-=125Mb/s data with swept
amplitude.
Note 9:Signal Detect De-assert Threshold is a measure of the pk-pk differential signal amplitude at the RXI+/- inputs of the RJ45 required to cause the Signal
Detect differential output to de-assert. Device configuration: LBEN=0, CDET=0, ENCSEL=0, EQSEL=float, PMRD+/-=static, RXI+/-=125Mb/s data with
swept amplitude
TXOmatch
REF
VCC
=510 , LBEN=0, CDET=0, ENCSEL=0, EQSEL=float, RXI+/-=static.
+
-
refers to the percentage of mismatch in current between TXO+ and TXO- referenced to the total output current as defined by:
REF
=510 , ENCSEL=0, PMRD+=0, PMRD-=1.
510
ICC
(Continued)
Figure 4-1. ICC / Load Diagram
TXREF
I
TXOmatch
TXVCC
TXGND RXGND GND
=
I
I
RXVCC
TXO+
TXO+
10
DP83223
+ I
- I
TXO-
TXO-
x 100
VCC
TXO+ TXO-
25
EXTVCC
PMID+
PMID-
SD+
SD-
25
VCC - 2V
ICC
external
50
+
-
50
50
50