Epson Stylus PHOTO 890 Service Manual page 23

EPSON Stylus PHOTO 890/1280/1290
Table 1-11.
Signal Level: TTL Compatible (IEEE-1284 level 1 device)
Parameter Minimum
VOH* -
VOL* -0.5V
IOH* -
IOL* -
CO -
VIH -
VIL 0.8V
IIH -
IIL -
CI -
* A low logic level on the Logic H signal is 2.0V or less when the printer is turned off,
and this signal is equal to or exceeding 3.0V when the printer is turned on. The
receiver shall provide an impedance equivalent to 7.5K ohm to ground.
PRODUCT DESCRIPTIONS
Maximum Condition
5.5V
-
0.32mA VOH = 2.4V
12mA VOL = 0.4V
50pF
2.0V
-
0.32mA VIH = 2.0V
12mA VIL = 0.8V
50pF
Interface
Revision C
23