MCP2021 datasheet(21/46 Pages) MICROCHIP

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DS22018E-page 21

MCP2021/2

2.3

AC Specification

AC CHARACTERISTICS

VBB = 6.0V to 18.0V; TA = -40°C to +125°C

Parameter

Sym

Min.

Typ.

Max.

Units

Test Conditions

Bus Interface - Constant Slope Time Parameters

Slope rising and falling

edges

tSLOPE

3.5

—

22.5

µs

7.3V <= VBB <= 18V

Propagation Delay of

Transmitter

tTRANSPD

——

4.0

µs

tTRANSPD = max (tTRANSPDR or

tTRANSPDF)

Propagation Delay of

Receiver

tRECPD

——

6.0

µs

tRECPD = max (tRECPDR or

tRECPDF)

Symmetry of Propagation

Delay of Receiver rising

edge w.r.t. falling edge

tRECSYM

-2.0

—

2.0

µs

tRECSYM = max (tRECPDF -

tRECPDR)

Symmetry of Propagation

Delay of Transmitter rising

edge w.r.t. falling edge

tTRANSSYM

-2.0

—

2.0

µs

tTRANSSYM = max (tTRANSPDF -

tTRANSPDR)

Time to sample of FAULT/

TXE for bus conflict reporting

tFAULT

—

32.5

µs

tFAULT = max (tTRANSPD +

tSLOPE + tRECPD)

Duty Cycle 1 @20.0 kbit/sec

39.6

—

%tBIT

CBUS;RBUS conditions:

1nF; 1k

Ω | 6.8 nF; 660Ω |

10 nF; 500

THREC(MAX) = 0.744 x VBB,

THDOM(MAX) = 0.581 x VBB,

VBB =7.0V - 18V; tBIT = 50 µs.

D1 = tBUS_REC(MIN) / 2 x tBIT)

Duty Cycle 2 @20.0 kbit/sec

—

58.1

%tBIT

CBUS;RBUS conditions:

1nF; 1k

Ω | 6.8 nF; 660Ω |

10 nF; 500

THREC(MAX) = 0.284 x VBB,

THDOM(MAX) = 0.422 x VBB,

VBB =7.6V - 18V; tBIT = 50 µs.

D2 = tBUS_REC(MAX) / 2 x tBIT)

Duty Cycle 3 @10.4 kbit/sec

41.7

—

%tBIT

CBUS;RBUS conditions:

1nF; 1k

Ω | 6.8 nF; 660Ω |

10 nF; 500

THREC(MAX) = 0.778 x VBB,

THDOM(MAX) = 0.616 x VBB,

VBB =7.0V - 18V; tBIT = 96 µs.

D3 = tBUS_REC(MIN) / 2 x tBIT)

Duty Cycle 4 @10.4 kbit/sec

—

59.0

%tBIT

CBUS;RBUS conditions:

1nF; 1k

Ω | 6.8 nF; 660Ω |

10 nF; 500

THREC(MAX) = 0.251 x VBB,

THDOM(MAX) = 0.389 x VBB,

VBB =7.6V - 18V; tBIT = 96 µs.

D4 = tBUS_REC(MAX) / 2 x tBIT)

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