Rainbow Electronics HD44780 - Manual (Page 51)

HD44780U
51
DC Characteristics (V
CC
= 4.5 to 5.5 V, T
a
= –30 to +75
°
C* 3 )
Item Symbol Min Typ Max Unit Test Condition Notes*
Input high voltage (1)
(except OSC1) VIH1 2.2 — V
CC
V 6
Input low voltage (1)
(except OSC1) VIL1 –0.3 — 0.6 V 6
Input high voltage (2)
(OSC1) VIH2 V
CC
–1.0 — V
CC
V 15
Input low voltage (2)
(OSC1) VIL2 — — 1.0 V 15
Output high voltage (1)
(DB0–DB7) VOH1 2.4 — — V –I
OH
= 0.205 mA 7
Output low voltage (1)
(DB0–DB7) VOL1 — — 0.4 V I
OL
= 1.2 mA 7
Output high voltage (2)
(except DB0–DB7) VOH2 0.9 V
CC
— — V –I
OH
= 0.04 mA 8
Output low voltage (2)
(except DB0–DB7) VOL2 — — 0.1 V
CC
V I
OL
= 0.04 mA 8
Driver on resistance
(COM) RCOM — 2 20 k
Ω ±
Id = 0.05 mA,
VLCD = 4 V
13
Driver on resistance
(SEG) RSEG — 2 30 k
Ω ±
Id = 0.05 mA,
VLCD = 4 V
13
Input leakage current I
LI
–1 — 1
µ
A VIN = 0 to V
CC
9
Pull-up MOS current
(DB0–DB7, RS, R/
W )
–I
p
50 125 250
µ
A V
CC
= 5 V
Power supply current I
CC
— 350 600
µ
A R
f
oscillation,
external clock
V
CC
= 5 V,
f
OSC
= 270 kHz
10, 14
LCD voltage VLCD1 3.0 — 11.0 V V
CC
–V5, 1/5 bias 16
VLCD2 3.0 — 11.0 V V
CC
–V5, 1/4 bias 16
Note: * Refer to the Electrical Characteristics Notes section following these tables.