X24640

13

SYMBOL TABLE

WAVEFORM

INPUTS

OUTPUTS

Must be

steady

Will be

steady

May change

from Low to

High

Will change

from Low to

High

May change

from High to

Low

Will change

from High to

Low

Don’t Care:

Changes

Allowed

Changing:

State Not

Known

N/A

Center Line

is High

The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal erase/

program cycle. During the write cycle, the X24640 bus interface circuits are disabled, SDA is allowed to remain

HIGH, and the device does not respond to its slave address.

Bus Timing

tSU:STA

t HD:STA

tHD:DAT

t SU:DAT

tLOW

t SU:STO

t R

t BUF

SCL

SDA IN

SDA OUT

t DH

tAA

tF

tHIGH

7038 FM 14

Write Cycle Limits

7038 FRM T11

Symbol

Parameter

Min.

Max.

Units

(6)

Write Cycle Time

5

10

ms

SCL

SDA

8th BIT

WORD n

ACK

t WC

ST OP

CONDITION

START

CONDITION

7038 FM 15

Guidelines for Calculating Typical Values of

Bus Pull-Up Resistors

120

100

80

40

60

20

20

40

60

80 100 120

0

0

BUS CAPACITANCE (pF)

MIN.

RESISTANCE

MAX.

RESISTANCE

RMAX =

CBUS

t R

RMIN =

IOL MIN

VCC MAX

=1.8K

Ω

7038 FM 16

Bus Timing

time the device requires to automatically complete the internal write operation.