pcf8548 NXP Semiconductors, pcf8548 Datasheet - Page 24

• Manufacturer Part Number: pcf8548
• Description: 65 X 102 Pixels Matrix Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
16 AC CHARACTERISTICS
V
unless otherwise specified.
Notes
1.
2. RES may be LOW before V
3. If t
4. All timing values are valid within the operating supply voltage and ambient temperature ranges and are referenced
5. The rise and fall times specified here refer to the driver device (i.e. not PCF8548) and are part of the general fast
6. The device inputs SDA and SCL are filtered and will reject spikes on the bus lines of width <t
1999 Aug 16
f
f
f
t
t
I
f
t
t
t
t
t
t
t
C
t
t
t
t
t
SYMBOL
OSC
clk(ext)
frame
VHRL
W(RES)
2
SCLK
SCLL
SCLH
SU;DAT
HD;DAT
r
f
f(SDA)(ro)
SU;STA
HD;STA
SU;STO
SW
BUF
DD1
C-bus timing characteristics; see note 4
b
65
to V
I
C
f
2
frame
= 1.9 to 5.5 V; V
C-bus specification. When PCF8548 asserts an acknowledge on SDA, the minimum fall time is 10 ns.
b
W(RES)
= capacitive load per bus line.
IL
102 pixels matrix LCD driver
and V
=
oscillator frequency
external clock frequency
frame frequency
V
RES LOW pulse width
SCL clock frequency
SCL clock LOW period
SCL clock HIGH period
data set-up time
data hold time
SCL and SDA rise time
SCL and SDA fall time
SDA fall time for read out
capacitive load represented by each
bus line
set-up time for a repeated START
condition
START condition hold time
set-up time for STOP condition
tolerable spike width on bus
bus free time between a STOP and
START condition
is longer than 3 ns (typical) a reset may be generated.
f
----------------- -
clk ext
DD1
520
IH
with an input voltage swing of V
to RES LOW
DD2
PARAMETER
and V
DD3
DD1
= 2.4 to 4.5 V; V
goes HIGH.
SS
V
T
f
note 1
see Fig.17 and note 2
see Fig.17 and note 3
note 5
note 5
V
note 6
SS1
OSC
to V
amb
DD1
DD1
and V
or f
DD
= 20 to +70 C
= 2.8 V;
= <3.6 V
CONDITIONS
24
.
clk(ext)
SS2
= 0 V; V
= 38 kHz;
LCD
= 4.5 to 9 V; T
20
20
0
100
0
1.3
0.6
100
0
20 + 0.1C
20 + 0.1C
20 + 0.1C
0.6
0.6
0.6
1.3
MIN.
b
b
b
amb
38
38
73
TYP.
= 40 to +85 C;
SW(max)
Product specification
PCF8548
70
100
1
400
0.9
300
300
1000
400
50
MAX.
.
kHz
kHz
Hz
ns
kHz
ns
ns
ns
ns
pF
ns
UNIT
s
s
s
s
s
s
s
s