Datasheet

© 2005-2012 Microchip Technology Inc. DS22018F-page 27
MCP2021/2/1P/2P
2.3 AC Specification
AC CHARACTERISTICS
V
BB = 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
t
SLOPE 3.5 — 22.5 µs 7.3V <= VBB <= 18V
Propagation Delay of
Transmitter
t
TRANSPD ——4.0µstTRANSPD = max (tTRANSPDR or
t
TRANSPDF)
Propagation Delay of
Receiver
tRECPD ——6.0µstRECPD = max (tRECPDR or
t
RECPDF)
Symmetry of Propagation
Delay of Receiver rising
edge w.r.t. falling edge
t
RECSYM -2.0 — 2.0 µs tRECSYM = max (tRECPDF -
t
RECPDR)
Symmetry of Propagation
Delay of Transmitter rising
edge w.r.t. falling edge
t
TRANSSYM -2.0 — 2.0 µs tTRANSSYM = max (tTRANSPDF -
t
TRANSPDR)
Time to sample of FAULT/
TXE for bus conflict reporting
t
FAULT ——32.5µstFAULT = max (tTRANSPD +
t
SLOPE + tRECPD)
Duty Cycle 1 @20.0 kbit/sec 39.6 — — %tBIT CBUS;RBUS conditions:
1nF; 1kΩ | 6.8 nF; 660Ω |
10 nF; 500Ω
TH
REC(MAX) = 0.744 x VBB,
TH
DOM(MAX) = 0.581 x VBB,
V
BB =7.0V - 18V; tBIT = 50 µs.
D1 = t
BUS_REC(MIN) / 2 x tBIT)
Duty Cycle 2 @20.0 kbit/sec — — 58.1 %t
BIT CBUS;RBUS conditions:
1nF; 1kΩ | 6.8 nF; 660Ω |
10 nF; 500Ω
TH
REC(MAX) = 0.284 x VBB,
TH
DOM(MAX) = 0.422 x VBB,
V
BB =7.6V - 18V; tBIT = 50 µs.
D2 = t
BUS_REC(MAX) / 2 x tBIT)
Duty Cycle 3 @10.4 kbit/sec 41.7 — — %tBIT CBUS;RBUS conditions:
1nF; 1kΩ | 6.8 nF; 660Ω |
10 nF; 500Ω
TH
REC(MAX) = 0.778 x VBB,
TH
DOM(MAX) = 0.616 x VBB,
V
BB =7.0V - 18V; tBIT = 96 µs.
D3 = t
BUS_REC(MIN) / 2 x tBIT)
Duty Cycle 4 @10.4 kbit/sec — — 59.0 %t
BIT CBUS;RBUS conditions:
1nF; 1kΩ | 6.8 nF; 660Ω |
10 nF; 500Ω
TH
REC(MAX) = 0.251 x VBB,
TH
DOM(MAX) = 0.389 x VBB,
V
BB =7.6V - 18V; tBIT = 96 µs.
D4 = t
BUS_REC(MAX) / 2 x tBIT)