Seiko LTPD247A, Technical Reference, Page: 33 / 78

3-19
Table 3-10 Electrical Characteristics of Thermal Head(LTPD347)
(at 25
°
C )
Rated value
Item Symbol Conditions
MIN TYP MAX
Unit
Thermal head
heat element resistance
R
H
1455 1500 1545 Ω
Thermal Head
drive voltage
V
P
21.6 24.0 26.4 V
Thermal Head
drive current
I
P
at the number of simultaneously
activated dots = 288
- - 5.23 A
2.7 3.3 3.6 V
Logic voltage V
dd
4.75 5 5.25 V
Logic current I
dd
f
DI
=1/2f
CLK
- - 48 mA
High V
IH
CLK, DI, LAT , DST 0.8V
dd
- V
dd
V
Input voltage
Low V
IL
CLK, DI, LAT , DST 0 - 0.2 V
dd
V
High I
IH
DI V
IH
= V
dd
- - 0.5
μ
A
DI input current
Low I
IL
DI V
IL
= 0V - - -0.5
μ
A
High I
IH
DST V
dd
- - 0.5
μ
A
2.7V ≤ V
dd
≤ 3.6V - - -16
μ
A
DST input current
(High active)
Low I
IL
DST V
IL
= 0V
4.75 ≤ V
dd
≤ 5.25V - - -24.5
μ
A
High I
IH
CLK V
IH
= V
dd
- - 2.0
μ
A
CLK input current
Low I
IL
CLK V
IL
= 0V - - -2.0
μ
A
High I
IH
LAT V
IH
= V
dd
- - 2.0
μ
A
LAT input current
Low I
IL
LAT
V
IL
= 0V - - -2.0
μ
A
2.7V ≤ V
dd
≤ 3.6V - - 8 MHz
CLK frequency f
CLK
4.75 ≤ Vdd ≤ 5.25V - - 16 MHz
2.7V ≤ V
dd
≤ 3.6V 56 - - ns
CLK pulse width t1
See the
Timing
Chart.
4.75 ≤ V
dd
≤ 5.25V 28 - - ns
2.7V ≤ V
dd
≤ 3.6V 30 - - ns
DI setup time t2
See the
Timing
Chart.
4.75 ≤ V
dd
≤ 5.25V 15 - - ns
2.7V ≤ V
dd
≤ 3.6V 10 - - ns
DI hold time t3
See the
Timing
Chart.
4.75 ≤ V
dd
≤ 5.25V 10 - - ns
LAT
setup time t4 See the Timing Chart. 100 - - ns
LAT
pulse width t5 See the Timing Chart. 100 - - ns
LAT
hold time t6 See the Timing Chart. 50 - - ns
DST setup time t7 See the Timing Chart. 300 - - ns
2.7V ≤ V
dd
≤ 3.6V 30 - - μ s
LAT
wait time t8*
See the
Timing
Chart.
4.75 ≤ V
dd
≤ 5.25V 15 - - μ s
*: If MIN at " LAT wait time" in the table cannot be secured, it may cause Vp voltage fluctuations.