Texas Instruments PCI7421 manual Device, Driver, Receiver, Parameter Test Condition MIN MAX Unit

14.4Electrical Characteristics Over Recommended Ranges of Operating Conditions (unless otherwise noted)

14.4.1	Device
	PARAMETER	TEST CONDITION	MIN	MAX	UNIT
VTH	Power status threshold, CPS input†	400-kΩresistor†	4.7	7.5	V
VO	TPBIAS output voltage	At rated IO current	1.665	2.015	V
II	Input current (PC0−PC2 inputs)	VCC = 3.6 V		5	∝A

†Measured at cable power side of resistor.

14.4.2

Driver

PARAMETER

TEST CONDITION

MIN

MAX

UNIT

VOD

Differential output voltage

56 Ω, See Figure 14−1

172

265

mV

IDIFF

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

Drivers enabled, speed signaling off

−1.05 †

1.05†

mA

I

Common-mode speed signaling current, TPB+, TPB−

S200 speed signaling enabled

−4.84 ‡

−2.53 ‡

mA

SP200

I

Common-mode speed signaling current, TPB+, TPB−

S400 speed signaling enabled

−12.4 ‡

−8.10 ‡

mA

SP400

VOFF

Off state differential voltage

Drivers disabled, See Figure 14−1

20

mV

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

rrents.

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

TPAx+

TPBx+

56 Ω

TPAx−

TPBx−

Figure 14−1. Test Load Diagram

14.4.3

Receiver

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

ZID

Differential impedance

Drivers disabled

4

7

kΩ

4

pF

ZIC

Common-mode impedance

Drivers disabled

20

kΩ

24

pF

VTH−R

Receiver input threshold voltage

Drivers disabled

−30

30

mV

VTH−CB

Cable bias detect threshold, TPBx cable inputs

Drivers disabled

0.6

1.0

V

VTH+

Positive arbitration comparator threshold voltage

Drivers disabled

89

168

mV

VTH−

Negative arbitration comparator threshold voltage

Drivers disabled

−168

−89

mV

VTH−SP200

Speed signal threshold

TPBIAS−TPA common mode

49

131

mV

VTH−SP400

Speed signal threshold

voltage, drivers disabled

314

396

mV

14−5