Contec DIO-32DM3-PE, Руководство пользователя

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3. External Connection
DIO-32DM3-PE
35
Detailed Control Output Signal Circuit
Control signals to be output include handshake output signals.
Figure 3.5. Control signal output circuit
What is the Control Signal ?
External clock signal (EXTCLK0/EXTCLK1)
These signals input external pacer clocks. The maximum frequency is 20MHz.
When the external clock input is set as the clock source, pattern input or output occurs at the falling
edge of this signal.
tPWH : Clock pulse high width 25ns (Min.)
tPWL : Clock pulse low width 25ns (Min.)
Figure 3.6. External clock signal
Output pin
GND GND
External circuit
5V TTL IC or LVTTL IC
Board
EXTACK0
EXTREQ1
SN74LVT245B
or equivalent
EXTCLK0
EXTCLK1
tPWH tPWL