Epson TM-T90 Specification page 42

Confidential
NOTES: 1. A prefix "n" to signal names refers to "L" active signals. To the host not provided with all
of the signal lines listed above, both-way communication fails.
2. For interfacing, signal lines shall use twisted pair cables with the return sides connected
to signal ground level.
3. Interfacing conditions shall all be based on the TTL level to meet the characteristics
described below. In addition, both rise time and fall time of each signal shall be
0.5 µs or less.
4. Data transmission shall not ignore the signal nAck or Busy. An attempt to transmit data
with either signal, nAck or Busy, ignored can cause lost data.
5. Interface cables shall be as short in length as possible.
2.1.2.4 Electrical characteristics
Characteristics
Output HIGH voltage
Output LOW voltage
Output HIGH current
Output LOW current
Input HIGH voltage
Input LOW voltage
Input HIGH current
Input LOW current
Characteristics
Output HIGH voltage
Output LOW voltage
EPSON
DC Characteristics (Except Logic-H, +5 V Signals)
Symbol
V *2.4 V
OH
V -0.5 V
OL
I 0.32 mA
OH
I -12 mA
OL
V 2.0 V
IH
V -
IL
I -
IH
I -
IL
Logic-H Signal Sender Characteristics
Symbol
V 3.0 V
OH
V -
OL
TITLE
TM-T90
Specification
(STANDARD)
Specifications
Min Max
5.5 V
*0.4 V
-
-
-
0.8 V
-0.32 mA
12 mA
Specifications
Min Max
5.5 V
2.0 V
SHEET
REVISION
F
Conditions
*I =0.32 mA
OH
*I =-12 mA
OL
V =2.4 V
OH
V =0.4 V
OL
V =2.0 V
IH
V =0.8 V
IL
Conditions
While the power is OFF
NO.
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