TUSB2040A

4-PORT HUB FOR THE UNIVERSAL SERIAL BUS

WITH OPTIONAL SERIAL EEPROM INTERFACE

SLLS288B – FEBRUARY 1998 – REVISED MARCH 1998

5

POST OFFICE BOX 655303

recommended operating conditions

MIN

NOM

MAX

UNIT

Supply voltage, VCC

3

3.3

3.6

V

Input voltage, TTL/LVCMOS, VI

0

VCC

V

Output voltage, TTL/LVCMOS, VO

0

VCC

V

High-level input voltage, signal-ended receiver, VIH(REC)

2

VCC

V

Low-level input voltage, signal-ended receiver, VIL(REC)

0.8

V

High-level input voltage, TTL/LVCMOS, VIH(TTL)

2

VCC

V

Low-level input voltage, TTL/LVCMOS, VIL(TTL)

0.8

V

Operating free-air temperature, TA

0

70

°C

External series, differential driver resistor, R(DRV)

22 (–5%)

22 (+5%)

Ω

Operating (dc differential driver) high speed mode, f(OPRH)

12

Mb/s

Operating (dc differential driver) low speed mode, f(OPRL)

1.5

Mb/s

Common mode, input range, differential receiver, V(ICR)

0.8

2.5

V

Input transition times, tt, TTL/LVCMOS

0

6

ns

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

voltage (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

MAX

UNIT

VOH

High level output voltage

USB data lines

R(DRV) = 15 kΩ, to GND

2.8

3.6

V

VOH

High-level output voltage

USB data lines

IOH = – 12 mA (without R(DRV))

VCC – 0.5

V

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

2

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

0.25

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

100

mA

ICC

Input supply current

Suspend mode

1

µA

† Applies for input buffers with hysteresis

‡ Applies for open drain buffers