
Preliminary W79E217A Data Sheet
Publication Release Date: December 14, 2007
- 192 -
Revision A3.0
DC Characteristics, continued
SPECIFICATION
MIN
TYP
-
3.3
PARAMETER
SYMBOL
MAX
-
UNIT
TEST CONDITIONS
V
OH11
V
DD
= 4.5V, I
OH
= -20mA
Output High Voltage
P2.0~P2.5, P5.0~P5.1
(PUSH-PULL Mode)
Output High Voltage P1, P2,
P3, P4, P5, P6, P7 (Quasi-
bidirectional Mode)
Sink current
[*2]
P0, P2, ALE,
/PSEN
Source current
[*2]
P0, P2,
ALE, /PSEN
V
OH12
-
2.5
-
V
V
DD
= 2.7V, I
OH
=-3.2mA
V
OH21
-
4.1
-
V
DD
= 4.5V, I
OH
=-100uA
V
OH22
-
2.52
-
V
V
DD
= 2.7V, I
OH
= -30uA
Isk31
Isk32
Isr31
Isr32
I
LCD
3
5
3.5
-7.5
-2
-
8
6
-9
-3
6
mA
mA
mA
mA
uA
V
DD
=4.5V, Vs = 0.45V
V
DD
=2.7V, Vs = 0.45V
V
DD
=4.5V, Vs = 2.4V
V
DD
=2.7V, Vs = 2.0V
All Seg ON
V
OL
= 0.4V
V
LCD
=3.0V
V
OH
= 2.4V
V
LCD
=3.0V
V
DD
= 5.0V; V
OL
= 0.4V
V
DD
= 3.0V; V
OL
= 0.4V
V
DD
= 5.0V; V
OH
= 4.4V
2.5
-6
-1
-
LCD Supply Current
COM0-COM3 Sink Current
(Used as LCD output)
I
OL1
0.4
-
-
uA
COM0-COM3 Drive Current
(Used as LCD output)
I
OH1
0.3
-
-
uA
I
OL1
I
OL1
I
OH1
0.9
0.7
-0.8
1.3
1.1
-1.15
-
-
-
Seg0-Seg31 Sink Current
(Used as LCD output)
mA
Seg0-Seg31 Drive
Current(Used as LCD
output)
Segment Output low voltage
(Used as DC output)
Segment Output high
voltage (Used as DC output)
I
OH1
-0.5
-0.8
-
mA
V
DD
= 3.0V; V
OH
= 2.4V
V
SL
-
-
0.4
V
I
OL
= 0.6mA
V
SH
2.4
-
-
V
I
OH
= 3uA
Notes:
*1. RST pin is a Schmitt trigger input. RST has internal pull-low resistors about 60k
Ω
.
*2. P0, P2, ALE and /PSEN are tested in the external access mode.
*3. XTAL1 is a CMOS input.
*4. Pins of P1, P2, P3, P4, P5, P6, P7 can source a transition current when they are being externally driven from 1 to 0.
The transition current reaches its maximum value when VIN approximates to 2.85V.