Table 85: ac characteristics – BECKHOFF ET1100 User Manual
Page 110
Electrical Specifications and Timings
III-96
Slave Controller
– ET1100 Hardware Description
Table 85: AC Characteristics
Symbol
Parameter
Min
Typ
Max
Units
f
CLK25
Clock source (OSC_IN) with initial accuracy
25 MHz ± 25 ppm
t
CLK25OUT1
CLK25OUT1 rising edge after OSC_IN rising
edge
5
ns
t
CLK25OUT2
CLK25OUT2 rising edge after OSC_IN rising
edge
7
ns
t
TX_delay
TX_ENA/TX_D[3:0] edge (TX-Shift = 00) after
rising edge of
a) OSC_IN
b) CLK25OUT1
c) CLK25OUT2
a) 5
b) 0
c) 38
ns
t
CPU_CLK
CPU_CLK (25 MHz) rising edge after OSC_IN
rising edge
5
ns
t
POR_Sample
POR value sample time after power good
84
ms
t
Driver_Enable
Output drivers enabled after POR values
sampled (not PDI and not Sync/LatchSignals)
80
ns
t
Reset_In
External reset input time
50
ns
t
Reset_Out
ET1100 Reset output time
80
84
ms
t
Reset_Func
ET1100 functional after RESET signal high
(EEPROM not loaded, PDI not functional)
50
µs
t
Startup
Startup time (PDI operational after power
good, without SII loading error)
340
ms
The AC characteristics of the PDIs, Distributed Clocks, EEPROM I
2
C interface, and MII interface can
be found in their respective chapters.