MAX7370 datasheet(4/37 Pages) MAXIM

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�� Maxim Integrated Products 4

MAX7370

8 x 8 Key-Switch Controller and LED Driver/GPIOs

with I2C Interface and High Level of ESD Protection

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 1.62V to 3.6V, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25NC.) (Notes 2, 3)

Note 2: All parameters are tested at TA = +25°C. Specifications over temperature are guaranteed by design.

Note 3: All digital inputs at VCC or GND.

Note 4: Guaranteed by design.

Note 5: CB = total capacitance of one bus line in pF. tR and tF measured between 0.8V and 2.1V.

Note 6: A master device must provide a hold time of at least 300ns for the SDA signal (referred to VIL of the SCL signal) to bridge

the undefined region of SCL’s falling edge.

Note 7: ISINK = 6mA. CB = total capacitance of one bus line in pF. tR and tF measured between 0.8V and 2.1V.

Note 8: Input filters on the SDA, SCL, and AD0 inputs suppress noise spikes less than 50ns.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

I2C TIMING SPECIFICATIONS

SCL Serial-Clock Frequency

fSCL

Bus timeout enabled

0.05

400

kHz

Bus timeout disabled

400

Bus Free Time Between a STOP and

START Condition

tBUF

1.3

Hold Time (Repeated) START Condition

tHD, STA

0.6

Repeated START Condition Setup Time

tSU, STA

0.6

STOP Condition Setup Time

tSU, STO

0.6

Data Hold Time

tHD, DAT (Note 6)

0.9

Data Setup Time

tSU, DAT

100

SCL Clock Low Period

tLOW

1.3

SCL Clock High Period

tHIGH

0.7

Rise Time of Both SDA and SCL

Signals, Receiving

(Notes 4, 5)

20 +

0.1CB

300

Fall Time of Both SDA and SCL Signals,

Receiving

(Notes 4, 5)

20 +

0.1CB

300

Fall Time of SDA Signal, Transmitting

tF, TX

(Notes 4, 7)

20 +

0.1CB

250

Pulse Width of Spike Suppressed

tSP

(Notes 4, 8)

Capacitive Load for Each Bus Line

(Note 4)

400

Bus Time Out

tTIMEOUT

ESD PROTECTION

ROW7–ROW0, COL7–COL0

IEC 61000-4-2 Air-Gap Discharge

IEC 61000-4-2 Contact Discharge

All Other Pins

Human Body Model

2.5

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