COM20051I View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'COM20051I' PDF : 74 Pages View PDF
TXEN
t4
nPULSE1
nPULSE2
t2
t1
t3
t1
RXIN
t6
t7
t5
LAST BIT
(400 nS BIT TIME)
t2
Parameter
t1 PULSE1, PULSE2 Pulse Width
t2 PULSE1, PULSE2 Period
t3 PULSE1, PULSE2 Overlap
t4 TXEN Low to PULSE1 Low**
t5 Beginning of Last Bit Time to TXEN High**
t6 RXIN Pulse Width
t7 RXIN Period
min typ max units
100*
nS
400*
nS
-10 0 +10 nS
850
950 nS
250
350 nS
10 100*
nS
400*
nS
* t1, t6 = .25 x ( 1 ) for data rates other than 2.5 Mpbs.
data rate
* t2,t7 = 8 x (crystal period) for clock frequencies other than 20
MHz. This period applies to data of two consecutive one's.
** t4: For clock frequencies other than 20 MHz, t4 = 18 x (crystal period) ± 50 nsec.
** t5: For clock frequencies other than 20 MHz, t5 = 6 x (crystal period) ± 50 nsec.
Note: Clock frequency for 5 Mbps is 40 MHz.
FIGURE 27 – NORMAL MODE TRANSMIT OR RECEIVE TIMING
(These signals are to and from the Hybrid)
SMSC DS – COM20051I
Page 71
Rev. 03/27/2000
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