MCP4921 datasheet(6/40 Pages) MICROCHIP

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MCP4921/4922

DS21897A-page 6

 2004 Microchip Technology Inc.

AC CHARACTERISTICS (SPI TIMING SPECIFICATIONS)

FIGURE 1-1:

SPI™ Input Timing.

Electrical Specifications: Unless otherwise indicated, VDD= 2.7V – 5.5V, TA= -40 to +125°C.

Typical values are at +25°C.

Parameters

Sym

Min

Typ

Max

Units

Conditions

Schmitt Trigger High-Level

Input Voltage (All digital input

pins)

VIH

0.7 VDD

——

V

Schmitt Trigger Low-Level

Input Voltage

(All digital input pins)

VIL

——

0.2 VD

D

V

Hysteresis of Schmitt Trigger

Inputs

VHYS

—0.05 VDD

—

Input Leakage Current

ILEAKAGE

-1

—

1

µASHDN = LDAC = CS = SDI =

SCK + VREF = VDD or AVSS

Digital Pin Capacitance

(All inputs/outputs)

CIN,

COUT

—10

—

pF

VDD = 5.0V, TA = +25°C,

fcLK = 1 MHz (Note 1)

Clock Frequency

FCLK

——

20

MHz

TA = +25°C (Note 1)

Clock High Time

tHI

15

—

ns

Note 1

Clock Low Time

tLO

15

—

ns

Note 1

CS Fall to First Rising CLK

Edge

tCSSR

40

—

ns

Applies only when CS falls with

CLK high. (Note 1)

Data Input Setup Time

tSU

15

—

ns

Note 1

Data Input Hold Time

tHD

10

—

ns

Note 1

SCK Rise to CS Rise Hold

Time

tCHS

15

—

ns

Note 1

CS High Time

tCSH

15

—

ns

Note 1

LDAC Pulse Width

tLD

100

—

ns

Note 1

LDAC Setup Time

tLS

40

—

ns

Note 1

SCK Idle Time before CS Fall

tIDLE

40

—

ns

Note 1

Note 1:

By design and characterization, not production tested.

CS

SCK

SI

LDAC

tCSSR

tHD

tSU

tLO

tCSH

tCHS

LSB in

MSB in

tIDLE

Mode 1,1

Mode 0,0

tHI

tLD

tLS

Số phần tương tự - MCP4921

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