PCA148X datasheet(13/20 Pages) PHILIPS

13 / 20 page

1998 Apr 21

Philips Semiconductors

Product speciﬁcation

32 kHz watch circuits with adaptive motor

pulse

PCA148x series

CHARACTERISTICS

VDD = 1.55 V; VSS =0V; fosc = 32.768 kHz; Tamb =25 °C; crystal: RS =20kΩ; C1 = 2 to 3 fF; CL = 8 to 10 pF;

C0 = 1 to 3 pF; unless otherwise speciﬁed.

Immunity against parasitic impedance = 20 M

Ω from one pin to an adjacent pin.

Note

1. Duty factor is 1 : 32 and RESET = VDD or VSS.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

VDD1

supply voltage

Tamb = −10 to +60 °C

1.2

1.55

2.5

∆V

supply voltage variation

transient

−−

0.25

VDD2

supply voltage pulse

programming

5.0

5.1

5.2

∆V

DDP

supply voltage pulse

variation

programming

0.55

0.6

0.65

IDD1

supply current

between motor pulses

−

170

260

IDD2

supply current

Tamb = −10 to +60 °C

−−

600

IDD3

supply current

stop mode; pin 8 connected

to VDD

−

180

280

Motor output

Vsat

saturation voltage

Σ (P + N) RM =2kΩ;

Tamb = −10 to +60 °C

−

150

200

Zo(sc)

output short-circuit

impedance

between motor pulses

Itransistor <1mA

−

200

300

Ω

Oscillator

VOSC ST

starting voltage

1.2

−−

transconductance

Vi(p-p) ≤ 50 mV

−µS

tosc

start-up time

−

∆f/f

frequency stability

∆V

DD = 100 mV

−

0.05

× 10−6 0.3 × 10−6

input capacitance

output capacitance

Voltage level detector

VEOL

threshold voltage

1.30

1.38

1.46

∆V

EOL

hysteresis of threshold

−

TCEOL

temperature coefﬁcient

−−1

−

mV/K

Reset input

output frequency

−

∆V

output voltage swing

R = 1 M

Ω; C = 10 pF

1.4

−−

tedge

edge time

R = 1 M

Ω; C = 10 pF

−

−µs

Iim

peak input current

note 1

−

320

−

Ii(av)

average input current

−

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