Epson Stylus Color 980 Service Manual page 24

EPSON Stylus Color 980
Table 1-10. 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 every output signal.
tt-in shows the rise and fall time of every input signal.
Typical time of tack is shown in Table 1-11.
Table 1-11. Typical Time of Tack
Parallel Interface Mode
High speed
Normal speed
Product Description
Minimum Maximum
500ns ---
500ns ---
500ns ---
0 ---
--- 500ns
--- 120ns
--- 200ns
0 ---
500ns 10us
0 ---
0 ---
Typical Time of Tack
1 us
3 us
Table 1-12. Signal level for TTL Compatible
(IEEE-1284 level 1 device)
Parameters
VOH*
VOL*
IOH*
IOL
CO
VIH
VIL
IIH
IIL
CI
* A LOW logic level on the Logic H signal is as follows:
2.0 V or less when the printer is turned off.
3.0 V or more when the printer is turned on.
The receiver provides an impedance equivalent to 7.5 K
ground.
See Table 1-13 which shows the connector pin assignment and signals
for the forward channel of the parallel interface.
Interface
Minimum Maximum
--- 5.5V
-0.5V ---
--- 0.32mA
--- 12mA
--- 50pF
--- 2.0V
0.8V ---
--- 0.32mA
--- 12mA
--- 50pF
Revision A
Condition
VOH = 2.4V
VOL = 0.4V
VIH = 2.0V
VIL = 0.8V
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