YTD428 데이터 시트보기 (PDF) - Yamaha Corporation

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YTD428

IDSU ISDN DSU for Terminal Equipment

Yamaha Corporation 

- 20 -

ELECTRICAL CHARACTERISTICS

I T Reference Point Transmit Characteristic (TE mode)

(VDD = 5.0 ± 5% V, Top = -20 ~ 70 °C, CL = 50 pF)

Parameter

HTD, LTD Pulse Period

HTD, LTD Pulse Gap

HTD, LTD Rise Time

HTD, LTD Fall Time

Transmit Signal

Delay Time

Zero Cross Delay Time

Symbol

tSW

tG AP

tSR

tSF

tSRL

tSRH

tSFH

tSFL

tSDZ

Condition

Note 1

Note 1

Note 1

Note 1

Note 1

Min.

4.95

0

Typ.

Max.

5.45

260

260

30

490

1010

165

685

1010

Units

µs

ns

ns

ns

ns

ns

ns

ns

ns

Note 1 Measuring with RL voltage drop as shown in Figure 5.4

Note 2 Figure 5.3 shows the timing when TDP = “H”. When TDP = “L”, the output signal polarity from HRD and LRD pins are

inverted.

HTD (I)

LTD (I)

Transmit signal (O)

(LOI - LO2)

t SW

t SR

t SF

t SW

t GAP

t SRH

t SRL

t SFL

t SFH

t SR

t SRH

t SRL

t SF

t SDZ

t SFL

t SFH

Figure 5.3 Transmit Timing

2.4 V

0.4 V

2.4 V

0.4 V

1.35 V

0.15 V

-0.15 V

-1.35 V

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