YTD428 Datasheet, PDF (10/14 Pages) YAMAHA CORPORATION – DSU LSI for the ISDN Terminal Equipment

s T Reference Point Receive Characteristic (TE mode)
(VDD = 5.0 V, Top = -20 ~ 70 °C, CL = 50 pF)
Parameter Symbol Condition Min. Typ. Max. Units
tRDR
700
ns
tRDL
Delay Time
tRDH
200
ns
700
ns
tRDF
700
ns
Rise Time
tRR
Note 1
30
ns
Fall Time
tRF
Note 2
30
ns
Note 1 With respect to HRD, LRD pins (ODSEL = “H”)
Note 2 With respect to HRD, LRD pins
Note 3 Figure 2 shows the timing when RDP = “H”. When RDP = “L”, the output signal polarity from HRD and LRD pins
are inverted.
Receive signal (I)
0V
(LI1 - LI2)
t RDR
t RDL
t RR
t RF
HRD (O)
LRD (O)
t RDH
t RR
t RDF
t RF
2.0V
0.8 V
2.0 V
0.8 V
Figure 2 Receive Timing
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