PCF8578USLASH2 datasheet(27/44 Pages) PHILIPS

27 / 44 page

1998 Sep 08

Philips Semiconductors

Product speciﬁcation

LCD row/column driver for dot matrix

graphic displays

PCF8578

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; external clock with 50% duty factor.

2. Resets all logic when VDD <VPOR.

3. Periodically sampled; not 100% tested.

4. Resistance measured between output terminal (R0 to R7, R8/C8 to R31/C31 and C32 to C39) and bias input

(V2 to V5, VDD and VLCD) when the specified current flows through one output under the following conditions

(see Table 2):

a) Vop =VDD − VLCD =9V.

b) Row mode, R0 to R7 and R8/C8 to R31/C31: V2 − VLCD ≥ 6.65 V; V5 − VLCD ≤ 2.35 V; ILOAD = 150 µA.

c) Column mode, R8/C8 to R31/C31 and C32 to C39: 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

IDD1

supply current external clock

fCLK = 2 kHz; note 1

−

615

µA

IDD2

supply current internal clock

ROSC = 330 kΩ−

µA

VPOR

power-on reset level

note 2

0.8

1.3

1.8

Logic

VIL

LOW level input voltage

VSS

−

0.3VDD

VIH

HIGH level input voltage

0.7VDD

−

VDD

IOL1

LOW level output current at SYNC

and CLK

VOL =1V; VDD =5V

−−

IOH1

HIGH level output current at SYNC

and CLK

VOH =4V; VDD =5V

−−

−1mA

IOL2

LOW level output current at SDA

VOL = 0.4 V; VDD =5V

−−

IL1

leakage current at SDA, SCL, SYNC,

CLK, TEST and SA0

Vi =VDD or VSS

−−

IL2

leakage current at OSC

Vi =VDD

−−

µA

input capacitance at SCL and SDA

note 3

−−

5pF

LCD outputs

IL3

leakage current at V2 to V5

Vi =VDD or VLCD

−2

−

µA

VDC

DC component of LCD drivers

R0 to R7, R8/C8 to R31/C31 and

C32 to C39

−±20

−

RROW

output resistance R0 to R7 and

R8/C8 to R31/C31

row mode; note 4

−

1.5

Ω

RCOL

output resistance R8/C8 to R31/C31

and C32 to C39

column mode; note 4

−

Ω

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