2003 Apr 14 27
Philips Semiconductors Product specification
LCD row/column driver for
dot matrix graphic displays
PCF8578
12 DC CHARACTERISTICS
V
DD
= 2.5 to 6 V; V
SS
=0V;V
LCD
=V
DD
− 3.5 V to V
DD
− 9V;T
amb
= −40 to +85 °C; unless otherwise specified.
Notes
1. Outputs are open; inputs at V
DD
or V
SS
; I
2
C-bus inactive; external clock with 50% duty factor.
2. Resets all logic when V
DD
<V
POR
.
3. Periodically sampled; not 100% tested.
4. Resistance measured between output terminal (R0 to R7, R8/C8 to R31/C31 and C32 to C39) and bias input
(V
2
to V
5
, V
DD
and V
LCD
) when the specified current flows through one output under the following conditions
(see Table 2):
a) V
op
=V
DD
− V
LCD
=9V.
b) Row mode, R0 to R7 and R8/C8 to R31/C31: V
2
− V
LCD
≥ 6.65 V; V
5
− V
LCD
≤ 2.35 V; I
LOAD
= 150 µA.
c) Column mode, R8/C8 to R31/C31 and C32 to C39: V
3
− V
LCD
≥ 4.70 V; V
4
− V
LCD
≤ 4.30 V; I
LOAD
= 100 µA.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Supplies
V
DD
supply voltage 2.5 − 6.0 V
V
LCD
LCD supply voltage V
DD
− 9 − V
DD
− 3.5 V
I
DD1
supply current external clock f
CLK
= 2 kHz; note 1 − 615 µA
I
DD2
supply current internal clock R
OSC
= 330 kΩ−20 50 µA
V
POR
power-on reset level note 2 0.8 1.3 1.8 V
Logic
V
IL
LOW level input voltage V
SS
− 0.3V
DD
V
V
IH
HIGH level input voltage 0.7V
DD
− V
DD
V
I
OL1
LOW level output current at SYNC
and CLK
V
OL
=1V; V
DD
=5V 1 −− mA
I
OH1
HIGH level output current at SYNC
and CLK
V
OH
=4V; V
DD
=5V −−−1mA
I
OL2
LOW level output current at SDA V
OL
= 0.4 V; V
DD
=5V 3 −− mA
I
L1
leakage current at SDA, SCL, SYNC,
CLK, TEST and SA0
V
i
=V
DD
or V
SS
−−+1mA
I
L2
leakage current at OSC V
i
=V
DD
−−+1µA
C
i
input capacitance at SCL and SDA note 3 −−5pF
LCD outputs
I
L3
leakage current at V
2
to V
5
V
i
=V
DD
or V
LCD
−2 −+2 µA
V
DC
DC component of LCD drivers
R0 to R7, R8/C8 to R31/C31 and
C32 to C39
−±20 − mV
R
ROW
output resistance R0 to R7 and
R8/C8 to R31/C31
row mode; note 4 − 1.5 3 kΩ
R
COL
output resistance R8/C8 to R31/C31
and C32 to C39
column mode; note 4 − 36 kΩ
