SX1511B datasheet(10/43 Pages) SEMTECH

Part #	SX1511B

Description	World?셲 Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine

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Manufacturer	SEMTECH [Semtech Corporation]

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ADVANCED COMMUNICATIONS & SENSING

Rev 3 – 9

th Sept. 2010

10

www.semtech.com

SX1510B/SX1511B/SX1512B

World’s Lowest Voltage Level Shifting GPIO

with LED Driver and Keypad Engine

Symbol

Description

Conditions

Min

Typ

Max

Unit

VOL

Low level output voltage

-

-0.4

-

0.3

V

VDDM >= 2V

-

8

IOHM

High level output source current

VDDM < 2V

-

2

mA

VDDM >= 2V

-

8

IOLM

Low level output sink current

VDDM < 2V

-

4

mA

fSCK

SCK max clock frequency

-

20

(4)

-

MHz

tSCK,LOW

SCK low time (% of SCK cycle)

-

45

-

55

%

tSCK,HIGH

SCK high time (% of SCK cycle)

-

45

-

55

%

tSI,SETUP

SI setup time

-

9

-

ns

tSI,HOLD

SI hold time

-

9

-

ns

tSO,VALID

SO valid time (% of SCK cycle)

After SCK falling edge

-

33

(4)

%

tNSS,SCK

NSS low to SCK rising edge

-

25

-

ns

tSCK,NSS

SCK falling edge to NSS high

-

25

-

ns

tNSS,HIGH

NSS rising to falling edge

-

25

-

ns

Miscellaneous

RPULL

Programmable pull-up/down

resistors for IO[0-7]

-

42

-

k

Internal (SX1510B)

1.1

2

3

Internal (SX1511/12B)

1.3

2

2.6

fOSC

Oscillator frequency

External from OSCIN

(40-60% duty cycle)

-

2.6

MHz

(1) Assuming no load connected to outputs and inputs fixed to VCC1,2 or GND.

(2) Can be increased by tying together and driving simultaneously several I/Os.

(3) SX1511/12B with RegHighInput bit enabled (VCCx min =1.65V), else 3.6V (VCCx min = 1.2V)

(4) fSCK is calculated assuming a tSO,VALID of maximum 1/3 of SCK cycle. This gives 1/6 of SCK cycle as setup time to the host controller.

For systems where the setup time can be relaxed, tSO,VALID is also shown in §3 to allow the user to calculate the maximum SPI frequency

for individual systems.

Table 6 – Electrical Specifications

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