TUSB2046A

4-PORT HUB FOR THE UNIVERSAL SERIAL BUS

WITH OPTIONAL SERIAL EEPROM INTERFACE

SLLS404 – DECEMBER 1999

6

POST OFFICE BOX 655303

electrical characteristics over recommended ranges of operating free-air temperature and supply

voltage (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

TTL/LVCMOS

IOH = –4 mA

VCC – 0.5

VOH

High-level output voltage

USB data lines

R(DRV) = 15 kΩ, to GND

2.8

V

USB data lines

IOH = – 12 mA (without R(DRV))

VCC – 0.5

TTL /LVCMOS

IOL = 4 mA

0.5

VOL

Low-level output voltage

USB data lines

R(DRV) = 1.5 k Ω to 3.6 V

0.3

V

USB data lines

IOL = 12 mA (without R(DRV))

0.5

VIT

Positive input threshold voltage

TTL /LVCMOS

1.8

V

VIT+

Positive input threshold voltage

Single-ended

0.8 V

≤ VICR ≤ 2.5 V

1.8

V

VIT

Negative input threshold voltage

TTL /LVCMOS

0.8

V

VIT–

Negative-input threshold voltage

Single-ended

0.8 V

≤ VICR ≤ 2.5 V

1

V

Vh

Input hysteresis† (V

V

)

TTL /LVCMOS

0.3

0.7

V

Vhys

Input hysteresis† (VT+ – VT–)

Single-ended

0.8 V

≤ VICR ≤ 2.5 V

300

500

mV

IOZ

High impedance output current

TTL/LVCMOS

V = VCC or GND‡

±10

µA

IOZ

High-impedance output current

USB data lines

0 V

≤ VO ≤ VCC

±10

µA

IIL

Low-level input current

TTL/LVCMOS

VI = GND

–1

µA

IIH

High-level input current

TTL/LVCMOS

VI = VCC

1

µA

zo(DRV) Driver output impedance

USB data lines

Static VOH or VOL

7.1

19.9

Ω

VID

Differential input voltage

USB data lines

0.8 V

≤ VICR ≤ 2.5 V

0.2

V

ICC

Input supply current

Normal operation

40

mA

ICC

Input supply current

Suspend mode

1

µA

† Applies for input buffers with hysteresis

‡ Applies for open drain buffers

differential driver switching characteristics over recommended ranges of operating free-air

full speed mode

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

tr

Transition rise time for DP or DM

See Figure 1 and Figure 2

4

20

ns

tf

Transition fall time for DP or DM

See Figure 1 and Figure 2

4

20

ns

t(RFM

Rise/fall time matching§

(tr/tf) × 100

90%

110%

VO(CRS) Signal crossover output voltage§

1.3

2.0

V

§ Charicterized only. Limits are approved by design and are not production tested.

low speed mode

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

tr

Transition rise time for DP or DM§

CL = 200 pF to 600 pF,

See Figure 1 and Figure 2

75

300

ns

tf

Transition fall time for DP or DM§

CL = 200 pF to 600 pF,

See Figure 1 and Figure 2

75

300

ns

t(RFM)

Rise/fall time matching§

(tr/tf) × 100

80%

120%

VO(CRS) Signal crossover output voltage§

CL = 200 pF to 600 pF

1.3

2.0

V

§ Charicterized only. Limits are approved by design and are not production tested.