PCF84C21A Philips Semiconductors, PCF84C21A Datasheet - Page 11

• Manufacturer Part Number: PCF84C21A
• Description: Telecom microcontrollers
• Manufacturer: Philips Semiconductors

Philips Semiconductors
12 AC CHARACTERISTICS
V
Table 2 I
Notes
1. DF stands for Division Factor: the divisor of f
2. Values given for ASC = 0; for ASC = 1: t
3. Determined by I
4. At maximum allowed I
5. Determined by program.
6. If t
1996 Nov 20
t
t
f
SCLK
t
t
t
t
t
SDA
t
t
t
t
t
t
DD
r
f
xtal
HD;STA
LOW
HIGH
RC
FC
BUF
SU;DAT
HD;DAT
RD
FD
SU;STO
Telecom microcontrollers
SYMBOL
SYMBOL
= 2.5 to 5.5 V; V
LOW
2
<
C-bus timing (see Figs 15 and 16)
--------
f
24
xtal
rise time all outputs
fall time all outputs
clock frequency
START condition hold time
SCLK LOW time
SCLK HIGH time
SCLK rise time
SCLK fall time
bus free time
data set-up time
data hold time
SDA/P2.3 rise time
SDA/P2.3 fall time
STOP condition set-up time
, t
SU:DAT
2
SS
C-bus capacitance (C
PARAMETER
PARAMETER
= 0 V; T
2
C-bus capacitance C
t
-------------------- -
LOW
f
xtal
amb
–
9
= 40 to +85 C; all voltages with respect to V
, independent of ASC.
b
) and external pull-up resistor.
HIGH
V
V
see Fig.3
DD
DD
b
xtal
=
= 400 pF.
= 5 V; T
= 5 V; T
3 DF
----------------------------
(see the “PCF84CxxxA family” data sheet).
4 f
CONDITIONS
xtal
+
11
amb
amb
(see Fig.14)
1
INPUT
0.3 s
250 ns
0.3 s
= 25 C; C
= 25 C; C
--------
f
--------
f
--------
f
1 s
--------
f
1 s
--------
f
; t
14
17
17
14
14
xtal
xtal
xtal
xtal
xtal
0
LOW
=
----------------- -
4 f
DF 3
L
L
= 50 pF
= 50 pF
PCF84C21A; PCF84C41A;
–
xtal
SS
; unless otherwise specified.
1
MIN.
(see Fig.15; note 1)
30
30
----------------- -
2 f
DF 3
----------------- -
2 f
DF
TYP.
0.1 s; note 4
0.1 s; note 4
4.7 s; note 5
1 s; note 3
--------
f
1 s; note 3
15
OUTPUT
xtal
PCF84C81A
Product specification
DF
----------------- -
2 f
----------------- -
2 f
–
DF 3
+
xtal
xtal
--------
f
3
xtal
9
+
–
xtal
xtal
16
; note 6
MAX.
9
; note 2
; note 2
ns
ns
MHz
UNIT