PCF1172CU datasheet(6/16 Pages) PHILIPS

Part #	PCF1172CU

Description	31/2-digit LCD car clock

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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6 / 16 page

1997 Apr 16

6

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

3

−

6V

external regulation

3

−

6V

internal regulation

IREG =1mA

4

5

6

V

IREG

regulation current with

internal regulation

0.2

−

5mA

IDD

current consumption

all switches open; without LCD;

internal regulation

disconnected; note 1

50

400

700

µA

ro

differential internal impedance

IREG =1mA

−−

150

Ω

Oscillator (pins 1 and 2; note 2)

tosc

start time

−−

200

ms

∆f/fosc

frequency stability

∆VDD = 100 mV

−

0.2

× 10−6 1 × 10−6

Rfb

feedback resistance

0.1

−

1M

Ω

Ci

input capacitance

−−

9pF

Co

output capacitance

19

24

29

pF

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

Ii

input current

with inputs connected to VSS

50

150

500

µA

td

debounce time

32

−

150

ms

RS

segment driver output

resistance

IL = ±50 µA

−

1

2.5

k

Ω

RBP

backplane driver output

resistance

IL = ±250 µA

−

0.2

0.5

k

Ω

fBP

backplane driver output

frequency

−

64

−

Hz

Voffset(DC)

LCD DC offset voltage

RL = 200 kΩ; CL =1nF

−−

±50

mV

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PCF1172CU Datasheet(PDF) 6 Page - NXP Semiconductors

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