Technosoft iPOS4808 MX Series, Technical Reference

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Technosoft 2014 30 iPOS4808 MX Technical Reference
Log
ic “HIGH”
2 5
Floating voltage (not connected) 4.4
Absolute maximum, surge (duration

1S)
†
-10 +15
Input current
Logic “LOW”; Pull to GND
1.2
mA
Logic “HIGH”; Internal
4.7K

pull-up to +5 0 0 0
Minimum pulse width 2 µS
ESD protection Human body model ±5 KV
2.5.11. Encoder Inputs (A/A+, A-, B/B+, B-, Z/Z+, Z-)
Min. Typ. Max. Units
Single-ended mode compliance Leave negative inputs disconnected TTL / CMOS / Open-collector
Input voltage, single-ended mode
A/A+, B/B+
Logic “LOW”
1.6
V
Logic “HIGH”
1.8
Floating voltage (not connected) 4.5
Input voltage, single-ended mode
Z/Z+
Logic “LOW”
1.2
V
Logic “HIGH”
1.4
Floating voltage (not connected) 4.7
Input current, single-ended mode
A/A+, B/B+, Z/Z+
Logic “LOW”; Pull
to GND 2.5 3
mA
Logic “HIGH”; Internal 2.2K 
pull-up to +5
0 0 0
Differential mode compliance For full RS422 compliance, see
1
TIA/EIA-422-A
Input voltage, differential mode
Hysteresis ±0.06 ±0.1 ±0.2
V
Common-mode range (A+ to GND, etc.) -7 +7
Input impedance, differential
A+ to A-, B+ to B- 4.2 4.7
K
Ω
Z+ to Z- 6.1 7.2
Input frequency Single-ended mode, Open-collector / NPN 0 5 MHz
Input frequency
Differential mode, or Single-ended driven
by push-pull (TTL / CMOS)
0 10 MHz
Minimum pulse width
Single-ended mode, Open-collector / NPN 1 µS
Differential mode, or Single-ended driven
by push-pull (TTL / CMOS)
50 nS
Input voltage, any pin to GND
Absolute maximum values, continuous -7 +7
V
Absolute maximum, surge (duration

1S)
†
-11 +14
ESD protection Human body model ±1 KV
1
For full RS-422 compliance, 120

termination resistors must be connected across the differential pairs, as close as
possible to the drive input pins. See Figure 3.16. Differential
incremental encoder connection