HD44780 Ver la hoja de datos (PDF) - Hitachi -> Renesas Electronics

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Fabricante

HD44780

Dot Matrix Liquid Crystal Display Controller/Driver

Hitachi -> Renesas Electronics 

HD44780U

AC Characteristics (VCC = 4.5 to 5.5 V, Ta = –30 to +75°C*3)

Clock Characteristics

Item

Symbol Min Typ Max Unit Test Condition Notes*

External External clock frequency fcp

125 250 350 kHz

11

clock

External clock duty

Duty 45

50

55

%

11

operation

External clock rise time

t rcp

—

—

0.2 µs

11

External clock fall time

t fcp

—

—

0.2 µs

11

Rf

Clock oscillation frequency fOSC

190 270 350 kHz Rf = 91 kΩ

12

oscillation

VCC = 5.0 V

Note: * Refer to the Electrical Characteristics Notes section following these tables.

Bus Timing Characteristics

Write Operation

Item

Symbol Min

Typ

Max

Unit

Test Condition

Enable cycle time

t cycE

500

—

—

ns

Figure 25

Enable pulse width (high level)

PWEH

230

—

—

Enable rise/fall time

tEr, tEf

—

—

20

Address set-up time (RS, R/W to E) tAS

40

—

—

Address hold time

t AH

10

—

—

Data set-up time

t DSW

80

—

—

Data hold time

tH

10

—

—

Read Operation

Item

Symbol Min

Typ

Max

Unit

Test Condition

Enable cycle time

t cycE

500

—

Enable pulse width (high level)

PWEH

230

—

Enable rise/fall time

tEr, tEf

—

—

Address set-up time (RS, R/W to E) tAS

40

—

Address hold time

t AH

10

—

Data delay time

t DDR

—

—

Data hold time

t DHR

5

—

—

ns

—

20

—

—

160

—

Figure 26

52

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