PCF1178CU datasheet(10/20 Pages) PHILIPS

10 / 20 page

1997 Apr 16

Philips Semiconductors

Product speciﬁcation

4-digit duplex LCD car clock

PCF1178C

CHARACTERISTICS

VDD =3to6V; VSS =0V; Tamb = −40 to +85 °C; crystal: f = 4.194304 MHz; Rs =50 Ω; CL = 12 pF; maximum

frequency tolerance =

±30 × 10−6; unless otherwise speciﬁed.

Note

1. A suitable resistor (R) must be selected (example):

a) VDD = 5 V; R max. (12 V − 5 V)/700 µA=10kΩ.

b) VDD = 5 V; R typ. (12 V − 5 V)/900 µA = 7.8 kΩ (more reserve).

c) IDD must not exceed 3 mA.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

VDD

supply voltage

voltage regulator programmed

to 4.5 V at Tamb =25 °C

−

∆V

supply voltage variation

S1 or S2 closed

−−

supply voltage variation due

to temperature

−−0.35

−

%/K

VDD = 4.5 V

−−16

−

mV/K

IDD

supply current

note 1

700

950

−µA

CEXT

capacitance

external capacitor

−−µF

Oscillator

tosc

start time

−−

200

∆f/f

frequency deviation

nominal n = 0

× 10−6

110

× 10−6

∆f/f

frequency stability

∆VDD = 100 mV

−−

× 10−6

Rfb

feedback resistance

300

1000

3000

Ω

input capacitance

−

output capacitance

−

Inputs

pull-up resistance

S1, S2, TS, SEL and DATA

180

Ω

pull-up/pull-down resistance

MODE

100

300

1000

Ω

IIL

leakage current

ENABLE, FLASH

−−

µA

debounce time

S1 and S2 only

100

VPP programming voltage

IO2

output current

VPP =VDD − 5V

−

700

µA

during programming

−

500

−µA

Backplane (high and low levels)

RBP

output resistance

±100 µA

−−

Ω

Segment

RSEG

output resistance

±100 µA

−−

Ω

LCD

Voffset(DC)

DC offset voltage

200 k

Ω/1 nF

−−

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