MAX6955AAX datasheet(4/39 Pages) MAXIM

Part #	MAX6955AAX

Description	2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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4 / 39 page

2-Wire Interfaced, 2.7V to 5.5V LED Display

Driver with I/O Expander and Key Scan

4

_______________________________________________________________________________________

TIMING CHARACTERISTICS

(Typical Operating Circuit, V+ = 2.7V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

TIMING CHARACTERISTICS

Serial Clock Frequency

fSCL

400

kHz

Bus Free Time Between a STOP

and a START Condition

tBUF

1.3

µs

Hold Time (Repeated) START

Condition

tHD, tSTA

0.6

µs

Repeated START Condition Setup

Time

tSU, tSTA

0.6

µs

STOP Condition Setup Time

tSU:STO

0.6

µs

Data Hold Time

tHD, tDAT

(Note 3)

0.9

µs

Data Setup Time

tSU, tDAT

100

ns

SCL Clock Low Period

tLOW

1.3

µs

SCL Clock High Period

tHIGH

0.6

µs

Rise Time of Both SDA and SCL

Signals, Receiving

tR

(Notes 2, 4)

20 +

0.1CB

300

ns

Fall Time of Both SDA and SCL

Signals, Receiving

tF

(Notes 2, 4)

20 +

0.1CB

300

ns

Fall Time of SDA Transmitting

tF, tX

(Notes 2, 5)

20 +

0.1CB

300

ns

Pulse Width of Spike Suppressed

tSP

(Notes 2, 6)

0

50

ns

Capacitive Load for Each

Bus Line

CB

(Note 2)

400

pF

Note 1: All parameters tested at TA = +25°C. Specifications over temperature are guaranteed by design.

Note 2: Guaranteed by design.

Note 3: A master device must provide a hold time of at least 300ns for the SDA signal (referred to VIL- of the SCL signal) in order to

bridge the undefined region of SCL’s falling edge.

Note 4: CB = total capacitance of one bus line in pF. tR and tF measured between 0.3V+ and 0.7V+.

Note 5: ISINK

≤ 6mA. CB = total capacitance of one bus line in pF. tR and tF measured between 0.3V+ and 0.7V+.

Note 6: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.

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