PCF1172CU datasheet(6/16 Pages) PHILIPS

6 / 16 page

1997 Apr 16

Philips Semiconductors

Product speciﬁcation

31/2-digit LCD car clock

PCF1172C

CHARACTERISTICS

VDD =5V; VSS =0V; Tamb = −40 to +85 °C; crystal: f = 4.194304 MHz; Rs =50 Ω; CL = 12 pF; unless otherwise

speciﬁed.

Notes

1. The current IEXT =IREG +IDD +2 × Ii (+ LCD current).

2. For correct operation of the oscillator: VDD ≥ 3V.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supply

VDD

supply voltage

external regulation

−

external regulation

−

internal regulation

IREG =1mA

IREG

regulation current with

internal regulation

0.2

−

5mA

IDD

current consumption

all switches open; without LCD;

internal regulation

disconnected; note 1

400

700

µA

differential internal impedance

IREG =1mA

−−

150

Ω

Oscillator (pins 1 and 2; note 2)

tosc

start time

−−

200

∆f/fosc

frequency stability

∆VDD = 100 mV

−

0.2

× 10−6 1 × 10−6

Rfb

feedback resistance

0.1

−

Ω

input capacitance

−−

9pF

output capacitance

Switches S1, S2 and S3 (pins 18, 3 and 4)

input current

with inputs connected to VSS

150

500

µA

debounce time

−

150

segment driver output

resistance

IL = ±50 µA

−

2.5

Ω

RBP

backplane driver output

resistance

IL = ±250 µA

−

0.2

0.5

Ω

fBP

backplane driver output

frequency

−

Voffset(DC)

LCD DC offset voltage

RL = 200 kΩ; CL =1nF

−−

±50

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