Datasheet PCA1487U, PCA1487U-10, PCA1487U-10-F2, PCA1488U-10-F1, PCA1484T Datasheet (Philips)

DATA SH EET

Product specification
Supersedes data of 1998 Mar 26
File under Integrated Circuits, IC16

1998 Apr 21

INTEGRATED CIRCUITS

PCA148x series

32 kHz watch circuits with adaptive
motor pulse

1998 Apr 21 2

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

FEATURES

• 32 kHz oscillator, amplitude regulated with excellent
frequency stability

• High immunity of the oscillator to leakage currents

• Time calibration electrically programmable and

reprogrammable (via EEPROM)

• A quartz crystal is the only external component required

• Very low current consumption; typically 170 nA

• Output for bipolar stepping motors of different types

• Up to 50% reduction in motor current compared with

conventional circuits, by self adaption of the motor pulse
width in accordance with the required torque of the
motor

• No loss of motor steps possible because of on-chip
detection of the induced motor voltage

• Indication for battery end-of-life

• Stop function for accurate timing

• Power-on reset for fast testing

• Various test modes for testing the mechanical parts of

the watch and the IC.

GENERAL DESCRIPTION

The PCA148x series devices are CMOS integrated circuits
specially suited for battery-operated,
quartz-crystal-controlled wrist-watches, with a bipolar
stepping motor.

ORDERING INFORMATION

Note

1. Figure 1 and Chapter “Package outline” show details of standard package, available for large orders only.
Chapter “Chip dimensions and bonding pad locations” shows exact pad locations for other delivery formats.

TYPE

NUMBER

PACKAGE

(1)

NAME DESCRIPTION VERSION

PCA1485U/7 − chip with bumps on tape −
PCA1486U/7 − chip with bumps on tape −
PCA1486U/10 − chip on foil −
PCA1487U/10 − chip on foil −

PINNING

SYMBOL PIN DESCRIPTION

V

SS

1 ground (0 V)
TEST 2 test output
OSC IN 3 oscillator input
OSC OUT 4 oscillator output
V

DD

5 supply voltage
M1 6 motor 1 output
M2 7 motor 2 output
RESET 8 reset input

Fig.1 Pin configuration, PCA148xT, (PMFP8).

1
2
3
4

8
7
6
5

PCA148xT

V

SS

TEST

OSC IN

OSC OUT

RESET
M2
M1

V

DD

MSA968

1998 Apr 21 3

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

FUNCTIONAL DESCRIPTION AND TESTING

The motor output delivers pulses of six different stages
depending on the torque required to turn the motor (Fig.3).
Every motor pulse is followed by a detection phase which
monitors the waveform of the induced motor voltage.
When a step is missed a correction sequence will be
started (Fig.2).

Motor pulses

The circuit produces motor pulses of six different stages
(stage 1 to 5, stage 6).

Stages 1 to 5 are used in normal operation, stage 6 occurs
under the following conditions:

• Correction pulse after a missing step

• End-of-life mode

• If stage 5 is not enough to turn the motor.

The ON state of the motor pulse varies between 43.75%
and 75% of the duty factor t

DF

= 977 µs depending on the

stage (Fig.3). It increases in steps of 6.25% per stage.

After a RESET the circuit always starts and continues with
stage 1, when all motor pulses have been executed.
A failure to execute all motor pulses results in the circuit
going into stage 2, this sequence will be repeated through
to stage 6.

When the motor pulses at stage 5 are not large enough to
turn the motor, stage 6 is implemented for a maximum of
8 minutes with no attempt to keep current consumption
low. After stage 6 has been executed the procedure is
repeated from RESET.

The circuit operates for 8 minutes at a fixed stage, if every
motor pulse is executed. The next 480 motor pulses are
then produced at the next lower stage unless a missing
step is detected. If a step is missed a correction sequence
is produced and for a maximum of 8 minutes the motor
pulses are increased by one stage.

Fig.2 Possible motor output waveform in normal operation with motor connected.

MSA969

MOTOR

PULSE

DETECTION

t

P

t

D

t

C

POSSIBLE CORRECTION

SEQUENCE

t

T

M1 - M2

V

1998 Apr 21 4

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor

pulse

PCA148x series

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MSA970

STAGE 1

STAGE 2

STAGE 3

STAGE 4

STAGE 5

t = 3.9 ms

P3

t = 5.86 ms

P2

t = 7.81 ms

P1

43.75 %

50.00 %

56.25 %

62.50 %

68.75 %

75.00 %

tt

DFDFSOFF

=

t

ONL

t

SOFF

t

DF

t = 977 µs

SON

t

t = 244 µs

SONF

ON

t

=

SON

tt

DF

STAGE 6

Fig.3 Motor pulses (VDD= 1.55 V).

t

OFF

for stage 1 to 6= 611 µs − stage × 61µs

tON for stage 1 to 6= 366 µs + stage × 61µs

1998 Apr 21 5

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

Voltage level detector

The supply voltage is compared with the internal voltage
reference V

EOL

every minute. The first voltage level

detection is carried out 30 ms after RESET.
When the detected VDD voltage level is greater than V

EOL

,

the circuit operates in normal mode (Fig.3).
If the battery end-of-life is detected (VDD< V

EOL

), the
detection and stage control is switched OFF and the
waveform of stage 6 will be executed. To indicate this
condition the waveform is produced in bursts of 4 pulses
every 4 s.

Detection of motor movement

After a motor pulse, the motor is short-circuited to VDD for
1 ms. Afterwards the energy in the motor inductor will be
dissipated to measure only the current generated by the
induced motor voltage. During the time tDI (dissipation of
energy time) all switches shown in Fig.4 are open to
reduce the current as fast as possible. The current will now
flow through the diodes D3 and D2, or D4 and D1. Then
the first of 52 possible measurement cycles (tMC) starts to
measure the induced current.

Fig.4 Motor driving and detecting circuit.

MSA941

V

DD

V

SS

MOTORM1 M2

N1 D3

P1 D1

L1 L2

N2D4

P2D2

1998 Apr 21 6

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

Detection criteria

The PCA148x uses current detection in two defined parts
of the detection phase to determine if the motor has moved
(refer to Figs 5 and 6). The detection criteria are:

part 1

• Minimum value of P = 1; where P = number of

measured positive current polarities after tDI.

part 2

• Minimum value of N = 2; where N = number of

measured positive current polarities since the first
negative current polarity after part 1 was detected
(see Fig.5).

If the opposite polarity is measured in one part, the internal
counter is reset, so the results of all measurements in this
part are ignored.

The waveform of the induced current must enable all these
measurements within the time t

D

after the end of a positive
motor pulse in order to be accepted as a waveform of an
executed motor pulse.

If the detection criterion is satisfied earlier, a measurement
cycle will not be started and the switches P1 and P2 stay
closed, the motor is switched to VDD.

Every measurement cycle (tMC) has 4 phases. These are
detailed in Table 1.

Note that detection and pulse width control will be switched
OFF when the battery voltage is below the end-of-life
voltage (V

EOL

), or if stage 5 is not sufficient to turn the

motor.

Table 1 Measurement cycle

SYMBOL PHASE DESCRIPTION

t

M1

1 During tM1 the switches P1 and P2 are closed in order to switch the motor to VDD, so the

induced current flows unaffected through the motor inductance.

t

M2

2 Measures the induced current; during a maximum time tM2 all switches are open until a

change is sensed by one of the level detectors (L1, L2). The motor is short-circuited to VDD.
Depending on the direction of the interrupted current:

• The current flows through diodes D3 and D2, causing the voltage at M1 to decrease in
relation to M2;

• The current flows through diodes D4 and D1, causing the voltage at M2 to decrease in
relation to M1.

A successfully detected current polarity is normally characterized by a short pulse of

0.5 to 10 µs with a voltage up to ±2.1 V, failed polarity detection by the maximum pulse width

of 61 µs and a voltage of ±0.5 V (see Fig.6).

t

M3

3 The switches P1 and P2 remain closed for the time tM3.

t

M4

4 If the circuit detectsfewer pulses than P and N respectively , a pulse of the time tM4 occurs to

reduce the induced current. Therefore P2 and P1 are opened and N1 and N2 are closed.
Otherwise P1 and P2 remain closed.

1998 Apr 21 7

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

Fig.5 Typical current waveform of a successfully executed motor pulse.

MSA944

MOTOR PULSE DETECTION PHASE

I

M1 - M2

part 1 part 2

detection criterion

is satisfied

t

t

DS

t

DI

t

P

t

D

MSA945

MOTOR

PULSE

DETECTION PHASE

M1 - M2

V

t

DS

t

DI

tM3tM4t

M1

t = 61

µs

M2

t = 244 µs

M1

t = 488 µs

MC

t = 61

µs

M2

t

D

t

P

M1

V

t

DS

t

DI

t = 61

µs

M2

t = 244 µs

M1

t = 488 µs

MC

t = 61

µs

M2

t = 244 µs

M1

detection
criterion is
satisfied

current polarity

not measured

Fig.6 Detection phase of the current waveform in Fig.5.

1998 Apr 21 8

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

Correction sequence (see Fig.7)
If a missing step is detected, a correction sequence is produced. This consists of a small pulse (tC1) which gives the motor

a defined position and after 29.30 ms a pulse of stage 6 (tC2) to turn the motor.

Fig.7 Correction sequence after a missing motor step with motor connected.

MSA943

MOTOR

PULSE

DETECTION CORRECTION SEQUENCE

t

P

t

C1

t

D

M1 - M2

V

= 977 µs

tC= 30.27 ms t

P

tC2=t

P

1998 Apr 21 9

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

Time calibration

Taking a normal quartz crystal with frequency 32768kHz,
frequency deviation (∆f/f) of ±15 × 10−6 and CL= 8.2 pF;
the oscillator frequency is offset (by using non-symmetrical
internal oscillator input and output capacitances of 10 pF
and 15 pF) such that the frequency deviation is
positive-only. This positive deviation can then be
compensated for to maintain time-keeping accuracy.

Once the positive frequency deviation is measured, a
corresponding number ‘n’ (see Table 2) is programmed
into the device’s EEPROM. This causes n pulses of
frequency 8192 Hz to be inhibited every minute of
operation, which achieves the required calibration.

The programming circuit is shown in Fig.8. The required
number n is programmed into EEPROM by varying V

DD

according to the steps shown in Fig.9, which are
explained below:

1. The positive quartz frequency deviation (∆f/f) is
measured, and the corresponding values of n are
found according to Table 2.

2. VDD is increased to 5.1 V allowing the contents of the
EEPROM to be checked from the motor pulse period
tT3 at nominal frequency.

3. V

DD

is decreased to 2.5 V during a motor pulse to

initialize a storing sequence.

4. The first VDD pulse to 5.1 V erases the contents of
EEPROM.

5. When the EEPROM is erased a logic 1 is at the TEST
pin.

6. VDD is increased to 5.1 V to read the data by pulsing
VDD n times to 4.5 V. After the n edge, VDD is
decreased to 2.5 V.

7. VDD is increased to 5.1 V to store n bits in the
EEPROM.

8. VDD is decreased to 2.5 V to terminate the storing
sequence and to return to operating mode.

9. VDD is increased to 5.1 V to check writing from the
motor pulse period tT3.

10. VDD is decreased to the operation voltage between
two motor pulses to return to operating mode.
(Decreasing VDD during the motor pulse would restart
the programming mode).

The time calibration can be reprogrammed up to
100 times.

Table 2 Quartz crystal frequency deviation, n and t

T3

Notes

1. Increments of 2.03 × 10−6/step.

2. Increments of 122 µs/step.

FREQUENCY

DEVIATION

∆f/f

(× 10

−6

)

NUMBER OF

PULSES

(n)

t

T3

(ms)

0

(1)

0 31.250

(2)

+2.03 1 31.372
+4.06 2 31.494

...
...
...

+127.89 63 38.936

Fig.8 Circuit for programming the time calibration.

MSA971

V

DD

M1

M2

RESET

V

SS

TEST

OSC IN

OSC OUT

M

PCA148x

SERIES

1

2

3

4

8

7

6

5

32 kHz

SIGNAL GENERATOR

1998 Apr 21 10

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor

pulse

PCA148x series

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MSA948

∆ V

DDP

123 n

t = 1 µs

edge

0.1 ms
min.

t

T3

CHECKING

STORINGDATA INPUTERASURECONTENT CHECKING

1 2

9 10

3 4 5 6 7 8 9 10

I

DD

V (V)

DD

0 (V )

SS

2.5

1.5

4.5

5.1

(1) (1) (1) (1)

t = 5 ms

E

t = 5 ms

S

(1) Rise and fall time should be greater than 400 µs/V for immediately correct checking.

Fig.9 VDD for programming.

1998 Apr 21 11

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

Power-on reset

For correct operation of the Power-on reset the rise time of
VDD from 0 V to 2.1 V should be less than 0.1 ms.
All resettable flip-flops are reset. Additionally the polarity of
the first motor pulse is positive: VM1− VM2≥ 0V.

Customer testing

An output frequency of 32 Hz is provided at RESET (pin 8)
to be used for exact frequency measurement. Every
minute a jitter occurs as a result of the inhibition, which
occurs 90 to 150 ms after disconnecting the RESET from
V

DD

.

Connecting the RESET to VDD stops the motor pulses
leaving them in a 3-state mode and sets the motor pulse
width for the next available motor pulse to stage 1. A 32 Hz
signal without jitter is produced at the TEST pin. Debounce
time RESET = 14.7 to 123.2 ms.

Connecting RESET to VSS activates Tests 1 and 2 and
disables the inhibition.

Test 1, V

DD>VEOL

. Normal function takes place except
that the motor pulse period is tT1= 125 ms instead of tT,
and the motor pulse stage is reduced every second
instead of every 8 minutes. At TEST a speeded-up
8 minute signal is available.

Test 2, VDD<V

EOL

. Motor pulses of stage 6 are produced,

with a time period of tT2= 31.25 ms.
Test and reset modes are terminated by disconnecting the

RESET pin.
Test 3, VDD> 5.1 V. Motor pulses without chopping are

produced, with a time period of tT3= 31.25 ms and
n × 122 µs to check the contents of the EEPROM.
At TEST a speeded-up cycle for motor pulse period signal
tT is available at 1024 times its normal frequency.
Decreasing VDD voltage level to lower than 2.5 V between
two motor pulses returns the circuit to normal operating
conditions.

AVAILABLE TYPES

Refer to Chapters “Ordering information” and “Functional description and testing”.

Note

1. U = Chip in trays; U/5 = wafer; U/7 = chip with bumps on tape.

SHORT

TYPE

NUMBER

DELIVERY

FORMAT

(1)

PERIOD

t

T

(s)

SPECIFICATIONS

PULSE

WIDTH

t

P

(ms)

DRIVE

(%)

DETECTION

CRITERION

EEPROM

BATTERY

EOL

DETECTION

REMARKS

1485 U/7 1 5.8 75 P = 1

N=2

yes yes

1486 U/7 1 5.8 75 P = 1

N=2

yes no

1487 U/5 1 7.8 75 P = 2

N=3

yes yes

1998 Apr 21 12

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

Note

1. Connecting the battery with reversed polarity does not destroy the circuit, but in this condition a large current flows,
which will rapidly discharge the battery.

HANDLING

Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in

“Data Handbook IC16, General, Handling MOS Devices”

.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

DD

supply voltage VSS= 0 V; note 1 −1.8 +6 V

V

I

all input voltages V

SS

V

DD

V

output short-circuit duration indefinite

T

amb

operating ambient temperature −10 +60 °C

T

stg

storage temperature −30 +100 °C

1998 Apr 21 13

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

CHARACTERISTICS

V

DD

= 1.55 V; VSS=0V; f

osc

= 32.768 kHz; T

amb

=25°C; crystal: RS=20kΩ; C1= 2 to 3 fF; CL= 8 to 10 pF;

C

0

= 1 to 3 pF; unless otherwise specified.

Immunity against parasitic impedance = 20 MΩ from one pin to an adjacent pin.

Note

1. Duty factor is 1 : 32 and RESET = V

DD

or VSS.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

DD1

supply voltage T

amb

= −10 to +60 °C 1.2 1.55 2.5 V

∆V

DD

supply voltage variation transient −− 0.25 V

V

DD2

supply voltage pulse programming 5.0 5.1 5.2 V

∆V

DDP

supply voltage pulse
variation

programming 0.55 0.6 0.65 V

I

DD1

supply current between motor pulses − 170 260 nA

I

DD2

supply current T

amb

= −10 to +60 °C −− 600 nA

I

DD3

supply current stop mode; pin 8 connected

to V

DD

− 180 280 nA

Motor output

V

sat

saturation voltage Σ (P + N) RM=2kΩ;

T

amb

= −10 to +60 °C

− 150 200 mV

Z

o(sc)

output short-circuit
impedance

between motor pulses
I

transistor

<1mA

− 200 300 Ω

Oscillator

V

OSC ST

starting voltage 1.2 −−V

g

m

transconductance V

i(p-p)

≤ 50 mV 6 15 −µS

t

osc

start-up time − 1 − s

∆f/f frequency stability ∆V

DD

= 100 mV − 0.05 × 10

−6

0.3 × 10

−6

C

i

input capacitance 8 10 12 pF

C

o

output capacitance 12 15 18 pF

Voltage level detector

V

EOL

threshold voltage 1.30 1.38 1.46 V

∆V

EOL

hysteresis of threshold − 10 − mV

TC

EOL

temperature coefficient −−1 − mV/K

Reset input

f

o

output frequency − 32 − Hz

∆V

o

output voltage swing R = 1 MΩ; C = 10 pF 1.4 −−V

t

edge

edge time R = 1 MΩ; C = 10 pF − 1 −µs

I

im

peak input current note 1 − 320 − nA

I

i(av)

average input current − 10 − nA

1998 Apr 21 14

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

TIMING PARAMETERS

Note

1. No option available when EOL indication is required.

SYMBOL PARAMETER SECTION VALUE OPTION UNIT

t

T

cycle for motor pulse (note 1) motor pulse (Figs 2 and 3) 1 5, 10, 12 or 20 s

t

P

motor pulse width 7.81 3.9 or 5.9 ms

t

DF

duty factor 977 −µs

t

ONL

last duty factor on 183 to 488 −µs

t

v

voltage detection cycle level mode 60 − s

t

SON

duty factor on silver-oxide mode (Fig.3) 427 to 733 −µs

t

SOFF

duty factor off 550 to 244 −µs

t

SONF

first duty factor on 244 −µs

t

E

EOL sequence end-of-life mode 4 − s

t

E1

motor pulse width t

P

− ms

t

E2

time between pulses 31.25 − ms

t

D

detection sequence detection (Fig.6) 4.3 to 28.3 − ms

t

DS

short-circuited motor 977 −µs

t

DI

dissipation of energy 977 −µs

t

MC

measurement cycle 488 −µs

t

M1

phase 1 244 −µs

t

M2

phase 2 (measure window) 61 −µs

t

M3

phase 3 122 −µs

t

M4

phase 4 61 −µs
P positive current polarities 2 P < N
N negative current polarities 3 2 to 6
t

C

correction sequence correction sequence (Fig.7) tP+ 30.27 − ms
t

C1

small pulse width 977 −µs
t

C2

large pulse width t

P

− ms

cycle time for motor pulses in: testing
t

T1

test 1 125 − ms

t

T2

test 2 31.25 − ms

t

T3

test 3 see Fig.9 31.25 to 39 − ms

t

DEB

debounce time for

RESET = V

DD

14.7 to 123.2 − ms

1998 Apr 21 15

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

CHIP DIMENSIONS AND BONDING PAD LOCATIONS

Table 3 Bonding pad locations (dimensions in µm)

All x/y coordinates are referenced to bottom left pad (V

DD

), see Fig.10.

PAD x y

V

SS

1290 1100
TEST 940 1100
OSC IN 481 1100
OSC OUT −102 1100
V

DD

00
M1 578 0
M2 930 0
RESET 1290 0
chip corner (max. value) −497.5 −170

Fig.10 Bonding pad locations, PCA148xU series; 8 terminals.

Chip area: 2.91 mm2.
Bonding pad dimensions: 110 µm × 110 µm.
Chip thickness: 200 ±25 µm, with bumps: 270 ±25 µm.

MSA972

0

0

1.44 mm

V

DD

M1 M2 RESET

V

SSTESTOSC INOSC OUT

y

x

2.02 mm

PCA148xU

SERIES

1998 Apr 21 16

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

APPLICATION INFORMATION

Fig.11 Typical application circuit diagram.

(1) Quartz crystal case should be connected to VDD. Stray capacitance and leakage resistance from RESET, M1 or M2 to OSC IN should be less than

0.5 pF or larger than 20 MΩ.

(2) Motor, probe and stray capacitance from M2 or M1 to V

DD

or VSS should be less than CM= 80 pF for correct operation of the detection circuit.

Driving the motor at its minimum energy, probe and stray capacitance must be avoided.

MSA967

V

DD

M1

M2

RESET

V

SS

TEST

OSC IN

OSC OUT

C

M

(2)

C

M

(2)

M

(1)

1.55 V

PCA148x

SERIES

1

2

3

4

8

7

6

5

1998 Apr 21 17

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

PACKAGE OUTLINE

UNIT ce

REFERENCES

OUTLINE
VERSION

EUROPEAN

PROJECTION

ISSUE DATE

IEC JEDEC EIAJ

mm

DIMENSIONS (mm are the original dimensions)

SOT144-1

94-01-25
95-01-24

b

n

max.

L

m

max.

H

E

0.40

0.25

0.19

0.12

3.1

2.9

3.1

2.9

4.6

4.4

0.80

0.75

0.26

0.3

Q

1

Q

2

wt

0.40

0.30

0.1

0.40

0.30

0.95

0.90

0.70

L

w M

b

Q

2

Q

1

0 2.5 5 mm

scale

Note

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

E

(1)(1)

D

e

t n

pin 1 index

41

58

D

E

c

m

X

detail X

PMFP8: plastic micro flat package; 8 leads (straight)

SOT144-1

A

2

A

2

H

E

1998 Apr 21 18

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

DEFINITIONS

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.

Data sheet status

Objective specification This data sheet contains target or goal specifications for product development.
Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.
Product specification This data sheet contains final product specifications.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the specification.

1998 Apr 21 19

Philips Semiconductors Product specification

32 kHz watch circuits with adaptive motor
pulse

PCA148x series

NOTES

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Printed in The Netherlands 415108/1200/04/pp20 Date of release: 1998 Apr 21 Document order number: 9397 750 03771