Seiko Instruments LTP F Series - Manual (Page 35)

3-17
3.5.3 Thermal Head Electrical Characteristics (LTPF247)
Table 3-7 Thermal Head Electrical Characteristics (LTPF247)
(Ta =25 ± 10°C)
Rated value
Item Symbol Conditions
MIN TYP MAX
Unit
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
activated dots
number=248 − 9.2 10.4 A
Logic block voltage Vdd 4.75 5.00 5.25 V
Logic block current Idd fCLK=8MHz,fDI=1/2fCLK − − 64 mA
"High" VIH CLK,DAT,LATCH,DST 0.8 ×Vdd − Vdd V
Input voltage
"Low" VIL CLK,DAT,LATCH,DST 0 − 0.2 ×Vdd V
"High" IIH DAT VIH = 5V − − 0.5 µA
DAT input
current "Low" IIL DAT VIL = 0V − − −0.5 µA
"High" IIH DST − − 120 µA
DST input
current "Low" IIL DST − − −2.0 µA
"High" IIH CLK − − 2.0 µA
CLK input
current "Low" IIL CLK − − −2.0 µA
"High" IIH LAT − − 2.0 µA LATCH input
current "Low" IIL LAT − − −2.0 µA
"High" VDOH OPEN state, Vdd =4.5V 4.45 − − µA DAT output
current "Low" VDOL − − 0.05 µA
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