Datasheet

 2014 Microchip Technology Inc. DS20005284A-page 13
MCP2561/2FD
FIGURE 2-3: TEST LOAD CONDITIONS
2.4 AC Characteristics
Electrical Characteristics: Extended (E): TAMB = -40°C to +125°C and High (H): TAMB = -40°C to +150°C; 
V
DD = 4.5V to 5.5V, VIO = 1.8V to 5.5V (Note 2), RL = 60CL = 100 pF; unless otherwise specified.
Param.
No.
Sym Characteristic Min Typ Max Units Conditions
1 t
BIT Bit Time 0.2 — 69.44 µs
2 fBIT Bit Frequency 14.4 — 5000 kHz
3 tTXD-BUSON Delay TXD Low to Bus Dominant — 65 — ns (Note 1)
4 t
TXD-BUSOFF Delay TXD High to Bus Recessive — 90 — ns (Note 1)
5 tBUSON-RXD Delay Bus Dominant to RXD — 60 — ns (Note 1)
6 tBUSOFF-RXD Delay Bus Recessive to RXD — 65 — ns (Note 1)
7 t
TXD - RXD Propagation Delay TXD to RXD — 90 120 ns
— 120 180 ns RL = 120CL = 200 pF,
(Note 1)
8a
t
BIT(RXD),2M Recessive bit time on RXD -
2 Mbps, Loop Delay Symmetry
450 485 550
ns
t
BIT(TXD) = 500 ns,
see Figure 2-10
400 460 550
ns
t
BIT(TXD) = 500 ns,
see Figure 2-10, 
RL = 120CL = 200 pF,
(Note 1)
8b
t
BIT(RXD),5M Recessive bit time on RXD -
5 Mbps, Loop Delay Symmetry
160 185 220
ns
t
BIT(TXD) = 200 ns,
see Figure 2-10
8c
t
BIT(RXD),8M Recessive bit time on RXD -
8 Mbps, Loop Delay Symmetry
85 105 140
ns
t
BIT(TXD) = 120 ns,
see Figure 2-10
(Note 1)
9 t
FLTR(WAKE) Delay Bus Dominant to RXD 
(Standby mode)
0.5 1 4 µs Standby mode
10 t
WAKE Delay Standby 
to Normal Mode
5 25 40 µs Negative edge on STBY
11 t
PDT Permanent Dominant Detect Time — 1.25 — ms TXD = 0V
12 tPDTR Permanent Dominant Timer Reset — 100 — ns The shortest Recessive
pulse on T
XD or CAN bus
to reset Permanent
Dominant Timer
Note 1: C
haracterized, not 100% tested.
VDD/2
CL
RL
Pin Pin
V
SS
VSS
CL
RL = 464 
C
L = 50 pF for all digital pins
Load Condition 1 Load Condition 2