MCP3909 datasheet(7/44 Pages) MICROCHIP

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DS22025B-page 7

MCP3909

FIGURE 1-1:

Output Timings for Active Power Pulse Outputs and Negative Power Pin.

FIGURE 1-2:

Serial Interface Timings showing Output, Rise, Hold, and CS Times.

CS Rise to Output Disable

tDIS

——

150

CLK Rise to Output Data Valid

tDO

—

SDO Rise Time

—2

—

SDO Fall Time

—2

—

TIMING CHARACTERISTICS (CONTINUED)

Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = DVDD = 4.5V to 5.5V,

AGND, DGND = 0V, MCLK = 3.58 MHz; TA = -40°C to +85°C.

Parameter

Sym

Min

Typ

Max

Units

Comment

Note 1: If output pulse period (tFP) falls below 984376*2 MCLK periods, then tFW = 1/2 tFP.

2: If output pulse period (tHP) falls below 322160*2 MCLK periods, then tHW = 1/2 tHP. When F2, F1, F0

equals 0,1,1, the HFOUT pulse time is fixed at 64 x MCLK periods or 18 µs for MCLK = 3.58 MHz

3: Specified by characterization, not production tested.

4: Serial timings specified and production tested with 180 pF load.

FOUT0

tFP

FOUT1

HFOUT

tFW

tHP

tHW

tFS

tFS2

NEG

CLK

SDI

tSU

tHD

tSUCS

tHI tLO

SDO

tDO

tDIS

tCLK

Hi-z

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