Epson C40UX service manual Parameter Minimum Maximum, Parallel I/F mode Typical time of tack

Stylus C40UX/C40SX/C20UX/C20SX Revision A

Parameter	Minimum	Maximum
tsetup	500 ns	-
thold	500 ns	-
tstb	500 ns	-
tready	0	-
tbusy	-	500 ns
tt-out*	-	120 ns
tt-in**	-	200 ns

Parameter	Minimum	Maximum
treply	0	-
tack	500 ns	10 us
tnbusy	0	-
tnext	0	-

*Rise and fall time of every output signals

**Rise and fall time of every input signals

***Typical time of tack is shown below.

Parallel I/F mode	typical time of tack
High speed	2us
Normal speed	4usror

Connector pin assignment and signals :

Pin No.	Signal Name	GND pin	In/Out	Functional description
	Return
1	-STROBE	19	In	The strobe pulse. Read-in of data is
				performed at the falling edge of this pulse.
2	DATA0	20	In	The DATA0 through DATA7 signals
				represent data bits 0 to 7, respectively.
3	DATA1	21	In
				Each signal is at high level when data is
4	DATA2	22	In	logical 1 and low level when data is logical 0.
5	DATA3	23	In
6	DATA4	24	In
7	DATA5	25	In
8	DATA6	26	In
9	DATA7	27	In
10	-ACKNLG	28	Out	This signal is a negative pulse indicating that
				the printer can again accept data.

Signal level : TTL compatible (IEEE-1284 level 1 device)

11 BUSY 29 Out A high signal indicates that the printer cannot

Parameter	Minimum	Maximum	Condition
VOH*	-	5.5 V
is.
VOL*	-0.5 V	-
IOH*	-	0.32 mA	VOH = 2.4 V
IOL*	-	12 mA	VOL = 0.4 V
CO	-	50 pF
VIH	-	2.0 V
VIL	0.8V	-
IIH	-	0.32 mA	VIH = 2.0 V
IIL	-	12 mA	VIL = 0.8 V
CI	-	50 pF

*A low logic level on the Logic H signal is.

2.0 V or less when the printer is powered off and this signal is equal or exceeding 3.0V when the printer is powered on.

The receiver shall provide an impedance equivalent to 7.5 K ohm to ground

				receive data.
12	PE	28	Out	A high signal indicates paper-out error.
13	SLCT	28	Out	Always at high level when the printer is
				powered on.
14	-AFXT	30	In	Not used.
				The falling edge of a negative pulse or a low
31	-INIT	30	In	signal on this line causes the printer to
				initialize. Minimum 50 us pulse is necessary.
32	-ERROR	29	Out	A low signal indicates printer error condition.
36	-SLIN	30	In	Not used.
18	Logic H	-	Out	Pulled up to +5 V via 3.9 K ohm resistor.
35	+5V	-	Out	Pulled up to +5 V via 3.3 K ohm resistor.

PRODUCT DESCRIPTION INTERFACE 14