PCF8579 datasheet(24/40 Pages) PHILIPS

24 / 40 page

1997 Apr 01

Philips Semiconductors

Product speciﬁcation

LCD column driver for dot matrix graphic

displays

PCF8579

12 DC CHARACTERISTICS

VDD = 2.5 to 6 V; VSS =0V; VLCD =VDD − 3.5 V to VDD − 9V;Tamb = −40 to +85 °C; unless otherwise speciﬁed.

Notes

1. Outputs are open; inputs at VDD or VSS; I2C-bus inactive; clock with 50% duty factor.

2. Resets all logic when VDD <VPOR.

3. Periodically sampled; not 100% tested.

4. Resistance measured between output terminal (C0 to C39) and bias input (V3, V4, VDD and VLCD) when the specified

current flows through one output under the following conditions (see Table 1):

− Vop =VDD − VLCD =9V;

− V3 − VLCD ≥ 4.70 V; V4 − VLCD ≤ 4.30 V; ILOAD = 100 µA.

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

Supplies

VDD

supply voltage

2.5

−

6.0

VLCD

LCD supply voltage

VDD − 9 −

VDD − 3.5 V

IDD

supply current

fCLK = 2 kHz; note 1

−

920

µA

VPOR

power-on reset level

note 2

−

1.3

1.8

Logic

VIL

LOW level input voltage

VSS

−

0.3VDD

VIH

HIGH level input voltage

0.7VDD

−

VDD

ILI1

leakage current at pins SDA, SCL,

SYNC, CLK, TEST, SA0, A0, A1, A2

and A3

Vi =VDD or VSS

−1

−

µA

IOL

LOW level output current at pin SDA

VOL = 0.4 V; VDD =5V 3

−−

input capacitance

note 3

−−

5pF

LCD outputs

ILI2

leakage current at pins V3 to V4

Vi =VDD or VLCD

−2

−

µA

VDC

DC component of LCD drivers pins

C0 to C39

−±20

−

RCOL

output resistance at pins C0 to C39

note 4

−

Ω

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