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78Q8430

10/100 Ethernet MAC and PHY

Teridian Semiconductor Corporation 

DS_8430_001

78Q8430 Data Sheet

4.4 Digital I/O Characteristics

Table 15: Digital I/O Characteristics

Parameter

Symbol Conditions

Min

Nom

Max Unit

Input Voltage Low

Input Voltage High

Input Current

Input Capacitance

Output Voltage Low

Output Voltage

High**

V IL

V IH

IIL, IIH

C IN

V OL

V OH

IOL = 8 mA

IOH = -8 mA

–

–

0.8

V

2.0

–

–

V

-1

–

1

µA

–

8

–

pF

–

–

0.4

V

2.4

–

–

V

Output Transition TT

Time

Tri-state Output

IZ

Leakage Current*

CL = 20 pF

–

–

IOH = -8 ma (H to Z )

Type tri-state only

-1

–

6

ns

1

µA

**PMEB and INTB are active low outputs requiring external pull-up resistors. VOH for these outputs is not

specified.

4.5 Analog Electrical Characteristics

4.5.1 100Base-TX Transmitter

Table 16: MII 100Base-TX Transmit Timing

Parameter

Conditions

Min Nom Max Unit

Peak Output Amplitude (|VP+|, |VP-|) Best-fit over 14 bit times; 950

(see note below)

0.4 dB Transformer loss

Output Amplitude Symmetry

|VP +|

0.98

|VP -|

Output Overshoot

Percent of VP+, VP-

–

Rise/Fall time (tR, tF)

10-90% of VP+, VP-

3

Rise/Fall time Imbalance

|tR - tF|

–

Duty Cycle Distortion

Deviation from best-fit

–

time-grid;

010101... Sequence

– 1050 mVpk

– 1.02

–

5

%

–

5

ns

– 500 ps

– ±250 ps

Jitter

Scrambled Idle, Internal

–

–

1.4

ns

Oscillator Mode

Note: Measured at the line side of the transformer. Test Condition: Transformer P/N: TLA-6T103. Line

Termination: 100 Ω±1%

4.5.2 100Base-TX Transmitter (Informative)

Table 17: MII 100Base-TX Transmitter (Informative)

Parameter

Conditions

Min

Max

Unit

Return Loss

2 < f < 30 MHz

30 < f < 60 MHz

60 < f < 80 MHz

16

–

dB

16 − 20 log f 

 30MHz 

10

Open-Circuit Inductance

-8 < IIN < 8 mA

350

–

µH

Note: The specifications in the preceding table are included for information only. They are mainly a

function of the external transformer and termination resistors used for measurements.

Rev. 1.2

19

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