PCD3745 datasheet(20/32 Pages) PHILIPS

20 / 32 page

1999 Feb 02

Philips Semiconductors

Product speciﬁcation

8-bit microcontroller with 4.5 kbytes OTP

memory and 32 kHz real-time clock

PCD3745A

Notes

1. VIL =VSS; VIH =VDD; outputs open:

a) Maximum values: external clock at XTAL1 and XTAL2 open-circuit.

b) Typical values: at 25

°C; crystal connected between XTAL1 and XTAL2.

VDD = 1.8 V; RESET, T1 and CE/T0 at VSS.

3. For proper operation of the counters the count pulse width (tW), negative and positive, should be 500 ns. If the

intention is to access the counters in read mode during counting, the count pulse width should be at least

2/fxtal + 500 ns.

4. Verified on sample bases. Not tested during production.

Port outputs (see Figs 14, 15 and 16)

IOL

LOW-level port sink current

VDD = 3 V; VO = 0.4 V

0.7

3.5

−

IOH

HIGH-level port pull-up source

current

VDD =3V; VO = 2.7 V

−10

−30

−µA

VDD =3V; VO =0V

−−140

−300

µA

IOH

HIGH-level port push-pull

source current

VDD = 3 V; VO = 2.6 V

−0.7

−3.5

−

Real-time clock 32 kHz oscillator

transconductance

Vi(p-p) < 50 mV

µS

δf/f

frequency adjustment

−0.6

−

+0.6

ppm

CI(RTC1)

RTC1 pin input capacitance

−

CO(RTC2)

RTC2 pin output capacitance

−

Clock inputs of peripheral counters (CLK1 and CLK2)

Vth(LH)

positive-going threshold

voltage

VDD =5V; Tamb = +25 °C; see Fig.7 −

0.6VDD −

Vth(HL)

negative-going threshold

voltage

VDD =5V; Tamb = +25 °C; see Fig.7 −

0.4VDD −

pulse width

notes 3 and 4; see Fig.7

500

−−

count frequency

note 4

−

MHz

XTAL oscillator

gmL

LOW transconductance

VDD = 5 V; see Fig.18

0.2

0.4

1.0

mA/V

feedback resistor

0.3

1.0

3.0

Ω

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

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