UCC5686, UCC5687

27-LINE 3V - 5V LVD TERMINATOR FOR WIDE ULTRA2, ULTRA3,

ULTRA160, AND ULTRA320 SCSI WITH INTEGRATED SPI3 DELAY

SLUS459B – OCTOBER 2000 – REVISED APRIL 2001

3

POST OFFICE BOX 655303

electrical characteristics over recommended operating free-air temperature range,

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

xTRMPWR Supply Current Section

xTRMPWR supply current

LVD mode

65

mA

xTRMPWR supply current

Disabled terminator

500

µA

1.25 V Regulator Section

1.25 V regulator

0.5 V

≤ VCM ≤ 2.0 V,

See Note 1

1.15

1.25

1.35

V

Regulator source current

VREG = 0 V

–300

–240

mA

Regulator sink current

VREG = 3.0 V

240

300

mA

1.3 V (DIFSENS) Regulator Section

1.3 V regulator

–5mA

≤ IDIFSENS ≤ 50 µA

1.2

1.3

1.4

V

Short-circuit source current

VDIFSENS = 0 V

–5

–8

–15

mA

Short-circuit sinkcurrent

VDIFSENS = 2.75 V

50

200

µA

Differential Termination Section (Applies to each line pair 1–27)

Differential bias voltage

100

125

mV

Differential impedance

100

105

110

Ω

Common-mode bias voltage

L+ and L– shorted together

1.15

1.25

1.35

V

Common-mode impedance

L+ and L– shorted together,

See Note 2

110

140

165

Ω

Disconnected Termination Section

Output leakage current

10

400

nA

Output capacitance

SE measurement to GND,

See Note 3

3

pF

Disconnect Control (DISCNCT1) or (DISNCNT2) and DIFFB Input Section

DISCNCT threshold voltage

0.8

1.3

2.0

V

DISCNCT input current

VDISCNCT = 0 V and 2.0 V

–30

–10

µA

DIFFB SE to LVD threshold voltage

0.5

0.7

V

DIFFB LVD to HPD threshold voltage

1.9

2.4

V

DIFFB Input current

0 V

≤ VDIFFB ≤ 2.75 V

–10

10

µA

Low-Voltage Differential (LVD) Status Bit Section

Source current

VLOAD = 2.4 V

–6

–4

mA

Sink current

VLOAD = 0.4 V

2

5

mA

Time Delay/Filter Section

Mode change delay

(See Note 4)

100

190

300

ms

Thermal Shutdown Section

Thermal shutdown threshold

For increasing temperature

140

155

170

_C

Thermal shutdown hysteresis

10

_C

NOTES:

1. VCM is applied to all L+ and L– lines simultaneously.

2.

Z

CM +

2.0 V

* 0.5 V

I

VCM (max) *

I

VCM (max)

, VCM(max) = 2.0 V, VCM(min) = 0.5 V

3. Ensured by design, not production tested.

4. A new mode change can begin any time after a previous mode change has been detected.