Epson Stylus COLOR 900 Service Manual page 23

EPSON Stylus COLOR 900/900N
Table 1-9. Data Transmission Timing
Parameter
tsetup
thold
tstb
tready
tbusy
tt-out*
tt-in**
treply
tack
tnbusy
tnext
NOTE: tt-out shows the rise and fall time of output signals.
tt-in shows the rise and fall time of input signals.
Typical time of tack is shown in Table 1-10.
Table 1-10. Typical Time of Tack
Parallel Interface Mode
High speed
Normal speed
Minimum Maximum
500 ns —
500 ns —
500 ns —
0 —
— 500 ns
— 120 ns
— 200 ns
0 —
500 ns 10 us
0 —
0 —
Typical Time of Tack
1 us
3 us
The following tables show typical input and output signal levels for the
interface (IEEE-1284 level 1 device). Signal levels are based on TTL
standards.
Table 1-11. Typical Output Signal Characteristics
Parameters
Voltage
Current
when V
Capacitance
Table 1-12. Typical Input Signal Characteristics
Parameters
Voltage
Current
when V
Capacitance
NOTE: The input and output signals are active-high; the logic level is
considered HIGH at 3.0 volts or more and LOW at 2.0 V or
less. The receiver shall provide an impedance equivalent to
7.5K ohm to ground.
Table 1-13 shows the connector pin assignments and signals for the
forward channel of the parallel interface.
Chapter 1 Product Description
Minimum Maximum
-0.5 V 5.5 V
0.32 mA 12 mA
= 2.4 V when V = 0.4 V
out out
— 50 pF
Minimum Maximum
0.8 V 2.0 V
0.32 mA 12 mA
= 2.0 V when V = 0.8 V
in in
— 50 pF
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