com20020-5 Standard Microsystems Corp., com20020-5 Datasheet - Page 52

• Manufacturer Part Number: com20020-5
• Description: Com20020-5 Ulanc Universal Local Area Network Controller With 2k X 8 On-board Ram
• Manufacturer: Standard Microsystems Corp.

RXIN
nPULSE2
nTXEN
nPULSE1
* t1 = 2 x (crystal period) for clock frequencies other than 40 MHz.
* t2,t7 = 8 x (crystal period) for clock frequencies other than 40 MHz.
** t4: For clock frequencies other than 40 MHz, t4 = 18 x (crystal period) ± 50 nsec.
** t5: For clock frequencies other than 40 MHz, t5 = 6 x (crystal period) ± 50 nsec.
t1
t2
t3
t4
t5
t6
t7
FIGURE 14 - NORMAL MODE TRANSMIT OR RECEIVE TIMING
This period applies to data of two consecutive one's.
nPULSE1, nPULSE2 Pulse Width
nPULSE1, nPULSE2 Period
nPULSE1, nPULSE2 Overlap
Beginning of Last Bit Time to nTXEN High**
RXIN Pulse Width
RXIN Period
nTXEN Low to nPULSE1 Low**
t4
Parameter
t6
t1
t3
t1
52
t7
t2
t2
min
400
100
-10
10
200
200 *
typ
50
50 *
0
(200 nS BIT TIME)
*
*
LAST BIT
max
t5
+10
500
200
units
nS
nS
nS
nS
nS
nS
nS