Seiko Instruments LTP F Series manual 35

3.5.3Thermal Head Electrical Characteristics (LTPF247)

Table 3-7 Thermal Head Electrical Characteristics (LTPF247)

(Ta=25 ± 10°C)

Item		Symbol	Conditions		Rated value			Unit
				MIN		TYP	MAX
Head resistance		RH		630.5		650	669.5	Ω
Head drive voltage		Vp		21.6		24.0	26.4	V
Head drive current		Ip	At max. simultaneously	−		9.2	10.4	A
			activated dots
			number=248
Logic block voltage		Vdd		4.75		5.00	5.25	V
Logic block current		Idd	fCLK=8MHz,fDI=1/2fCLK	−		−	64	mA
Input voltage	"High"	VIH	CLK,DAT,LATCH,DST	0.8⋅Vdd		−	Vdd	V
	"Low"	VIL	CLK,DAT,LATCH,DST	0		−	0.2⋅Vdd	V
DAT input	"High"	IIH DAT	VIH = 5V	−		−	0.5	∝A
current	"Low"	IIL DAT	VIL = 0V	−		−	−0.5	∝A
DST input	"High"	IIH DST		−		−	120	∝A
current	"Low"	IIL DST		−		−	−2.0	∝A
CLK input	"High"	IIH CLK		−		−	2.0	∝A
current	"Low"	IIL CLK		−		−	−2.0	∝A
LATCH input	"High"	IIH LAT		−		−	2.0	∝A
current	"Low"	IIL LAT		−		−	−2.0	∝A
DAT output	"High"	VDOH	OPEN state, Vdd =4.5V	4.45		−	−	∝A
current	"Low"	VDOL		−		−	0.05	∝A
CLK frequency		f CLK		−		−	4	MHz
CLK pulse width		tw CLK	See Timing Chart	35		−	−	ns
DAT setup-time		tsetup DI	See Timing Chart	30		−	−	ns
DAT hold time		thold DI	See Timing Chart	10		−	−	ns
DAT out delay time		td DO	See Timing Chart	−		−	120	ns
LATCH pulse width		tw LAT	See Timing Chart	100		−	−	ns
LATCH setup time		tsetup LAT	See Timing Chart	200		−	−	ns
LATCH hold time		thold LAT	See Timing Chart	50		−	−	ns
DST setup time		tsetup DST	See Timing Chart	300		−	−	ns
Output delay time		tDo	See Timing Chart	−		−	10	ns

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