Datasheet
TJA1085 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 23 October 2012 45 of 61
NXP Semiconductors
TJA1085
FlexRay active star coupler
[1] Sum of rise and fall times on TXD (20 % to 80 % on V
IO
) is 9 ns (max).
[2] Guaranteed for V
bus(dif)
= 300 mV and V
bus(dif)
= 150 mV; V
bus(dif)
is the differential bus voltage, V
BP
-V
BM
.
[3] V
cm
is the BP/BM common mode voltage (V
cm
=(V
BP
+ V
BM
)/2).
[4] Defined for V
INH
=2V.
Bus error diagnosis
t
to(BFT)
BFT time-out time 80 - 180 ns
Clamp detection
t
detCL(bus)
bus clamp detection time 650 - 2600 s
t
detCL(TRXD)
TRXD clamp detection time 650 - 2600 s
t
detCL(TXEN)
TXEN clamp detection time 650 - 2600 s
t
det(col)(TRXD)
TRXD collision detection time 40 - 120 ns
Transition timing
t
to_stargotosleep
dStarGoToSleep time-out time 640 - 6400 ms
t
t(bnorm-bdis)
branch normal to branch disabled
transition time
AS_Normal; after a host
‘Branch_Disabled’ command; rising
edge on SCSN to transmitter
deactivated
--1s
t
t(bdis-bnorm)
branch disabled to branch normal
transition time
AS_Normal; after a host
‘Branch_Normal’ command; rising
edge on SCSN to transmitter
activated
--1s
t
t(bnorm-btx2)
branch normal to branch TxOnly2
transition time
AS_Normal; after a host
‘Branch_TxOnly’ command; rising
edge on SCSN to deactivating
receive function
--1s
t
t(btx2-bnorm)
branch TxOnly2 to branch normal
transition time
AS_Normal; after a host
‘Branch_Normal’ command; rising
edge on SCSN to activating receive
function
--1s
t
t(moch)
mode change transition time after host command
AS_Sleep to AS_Standby
rising edge on SCSN to rising edge
on INH
--25s
Table 15. Dynamic characteristics …continued
All parameters are guaranteed for V
BAT
= 4.45 V to 60 V; V
CC
= 4.45 V to 5.25 V; V
BUF
= 4.45 V to 5.25 V; V
IO
= 2.55 V to
5.25 V; T
vj
=
40
C to + 150
C; R
bus
= 40
, C
bus
= 100 pF; C
RXD
= 15 pF; C
TRXD0
= C
TRXD1
= 50 pF and C
SDO
= 50 pF
unless otherwise specified. All voltages are defined with respect to ground; positive currents flow into the IC.
Symbol Parameter Conditions Min Typ Max Unit