Zeiss LSM 880 Operating Manual page 618

ZEISS
Type/Voltage Range:
TTL signal level 3.3 V, CMOS low power consumption
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5.0 V tolerant input/output for interfacing with 5 V logic
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Load:
Output: < 50 mA (internal serial 68 ohm resistor)
Input: 4.7 kOhm input impedance (internal 4.7 kOhm pullup to 3.3 V)
Trigger pulse description:
Signal output:
Low level < 0.4 V, high level > 2.4 V (I = 10 mA)
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Slew rate 10 ns/V
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Reaction time trigger OUT 8 msec typical
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Signal input:
Low level <0.5 ... 0.8 V, high level >2.0 ... 5.5 V
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Falling edge force interrupt
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Pulse width to detect signal > 50 ns
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Reaction time trigger IN 16 msec typical
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Caution:
Never apply more than 5 V or negative voltages to avoid any damage.
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In and outputs are not galvanically decoupled.
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Therefore proper measures for galvanic decoupling of external devices have to be taken (opto-
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coupler etc.).
16
CHAPTER 4 - ANNEX
Specification of Trigger-Interface
000000-2071-464
LSM 880
10/2014 V_01