TSB41AB3EP

IEEE 1394a2000 THREEPORT CABLE TRANSCEIVER/ARBITER

SGLS122C − JULY 2002 − REVISED JUNE 2008

12

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

electrical characteristics over recommended ranges of operating conditions (unless otherwise noted)

driver

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOD

Differential output voltage

56

Ω,

See Figure 1

172

265

mV

I(DIFF)

Driver difference current, TPA+, TPA−, TPB+, TPB−

Drivers enabled, speed signaling off

−1.05†

1.05†

mA

I(SP200)

Common-mode speed signaling current, TPB+,

TPB−

S200 speed signaling enabled

−4.84‡

−2.53‡

mA

I(SP400)

Common-mode speed signaling current, TPB+,

TPB−

S400 speed signaling enabled

−12.4‡

−8.1‡

mA

VOFF

Off state differential voltage

Drivers disabled,

See Figure 1

20

mV

† Limits defined as algebraic sum of TPA+ and TPA− driver currents. Limits also apply to TPB+ and TPB− algebraic sum of driver currents.

‡ Limits defined as absolute limit of each of TPB+ and TPB− driver currents.

receiver

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

zid

Differential impedance

Drivers disabled

4

7

k

Ω

zid

Differential impedance

Drivers disabled

4

pF

zic

Common-mode impedance

Drivers disabled

20

k

Ω

zic

Common-mode impedance

Drivers disabled

24

pF

V(TH_R)

Receiver input threshold voltage

Drivers disabled

−30

30

mV

V(TH_CB)

Cable bias detect threshold, TPBx cable inputs

Drivers disabled

0.6

1

V

V(TH+)

Positive arbitration comparator threshold voltage

Drivers disabled

89

168

mV

V(TH−)

Negative arbitration comparator threshold voltage

Drivers disabled

−168

−89

mV

V(TH_SP200)

Speed signal threshold

TPBIAS−TPA common-mode

voltage, drivers disabled

49

131

mV

V(TH_SP400)

Speed signal threshold

TPBIAS−TPA common-mode

voltage, drivers disabled

314

396

mV