TI380C27 Datasheet, PDF (40/77 Pages) Texas Instruments – DUAL-PROTOCOL COMMPROCESSOR

TI380C27
DUAL-PROTOCOL COMMPROCESSOR
SPWS014A – APRIL 1994 – REVISED MARCH 1995
token ring: ring-interface timing
NO.
153 Period of RCLK (see Note 17)
4Mbps
16 Mbps
154L Pulse duration, RCLK low
4 Mbps nominal: 62.5 ns
16 Mbps nominal: 15.625 ns
154H Pulse duration, RCLK high
4 Mbps nominal: 62.5 ns
16 Mbps nominal: 15.625 ns
155 Setup time, RCVR valid before rising edge (1.8 V) of RCLK at 16 Mbps
156 Hold time, RCVR valid after rising edge (1.8 V) of RCLK at 16 Mbps
158L Pulse duration, ring baud clock low
4 Mbps
16 Mbps
158H Pulse duration, ring baud clock high
4 Mbps
16 Mbps
165 Period of OSCOUT and PXTALIN (see Note 17)
4 Mbps
16 Mbps (for PXTALIN only)
Tolerance of PXTALIN input frequency (see Note 17)
NOTE 17: This parameter is not tested but is required by the IEEE 802.5 specification.
153
154H
MIN TYP MAX
125
31.25
46
15
35
8
10
4
40
9
40
9
125
31.25
± 0.01
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
%
RCLK
RCVR
154L
156
155
Valid
OSCOUT,
PXTALIN
158H
158L
165
Figure 12. Ring-Interface Timing
1.5 V
40
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