MCP2021/2
2.3
AC Specification
VBB = 6.0V to 18.0V; TA = -40°C to +125°C
AC CHARACTERISTICS
Parameter
Sym
Min.
Typ.
Max.
Units
Test Conditions
Bus Interface - Constant Slope Time Parameters
Slope rising and falling
edges
tSLOPE
tTRANSPD
tRECPD
3.5
—
—
—
—
22.5
4.0
6.0
2.0
µs
µs
µs
µs
7.3V <= VBB <= 18V
Propagation Delay of
Transmitter
—
tTRANSPD = max (tTRANSPDR or
tTRANSPDF
)
Propagation Delay of
Receiver
—
tRECPD = max (tRECPDR or
tRECPDF)
Symmetry of Propagation
Delay of Receiver rising
edge w.r.t. falling edge
tRECSYM
-2.0
tRECSYM = max (tRECPDF -
tRECPDR)
Symmetry of Propagation
Delay of Transmitter rising
edge w.r.t. falling edge
tTRANSSYM
tFAULT
-2.0
—
2.0
µs
µs
tTRANSSYM = max (tTRANSPDF -
tTRANSPDR)
Time to sample of FAULT/
TXE for bus conflict reporting
—
—
—
32.5
—
tFAULT = max (tTRANSPD +
tSLOPE + tRECPD)
Duty Cycle 1 @20.0 kbit/sec
Duty Cycle 2 @20.0 kbit/sec
Duty Cycle 3 @10.4 kbit/sec
Duty Cycle 4 @10.4 kbit/sec
39.6
%tBIT CBUS;RBUS conditions:
1 nF; 1 kΩ | 6.8 nF; 660Ω |
10 nF; 500Ω
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)
—
41.7
—
—
—
—
58.1
%tBIT CBUS;RBUS conditions:
1 nF; 1 kΩ | 6.8 nF; 660Ω |
10 nF; 500Ω
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)
—
%tBIT CBUS;RBUS conditions:
1 nF; 1 kΩ | 6.8 nF; 660Ω |
10 nF; 500Ω
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)
59.0
%tBIT CBUS;RBUS conditions:
1 nF; 1 kΩ | 6.8 nF; 660Ω |
10 nF; 500Ω
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)
© 2009 Microchip Technology Inc.
DS22018E-page 21
MICROCHIP [ MICROCHIP ]
