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LTC1955

sn1955 1955fs

VBATT, DVCC, CPO, FAULT,

UNDERV to GND ....................................... –0.3V to 6.0V

PRES A/PRES B, DATA, RIN, SYNC, ASYNC,

LD, DIN, SCLK to GND ............... –0.3V to (DVCC + 0.3V)

I/O A .......................................... –0.3V to (VCCA + 0.3V)

I/O B .......................................... –0.3V to (VCCB + 0.3V)

ORDER PART

NUMBER

TJMAX = 150°C, θJA = 34°C/W

EXPOSED PAD IS SGND

Consult LTC Marketing for parts specified with wider operating temperature ranges.

LTC1955EUH

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VPVBATT = VSVBATT = 3.3V, DVCC = 3.3V unless otherwise noted.

IVCCA/IVCCB ........................................................................... 80mA

VCCA/VCCB Short-Circuit Duration .................... Indefinite

Operating Ambient Temperature Range

(Note 4) .............................................. – 40

°C to 85°C

Storage Temperature Range ................. – 65

°C to 125°C

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Power Supply

VBATT Operating Voltage

2.7

5.5

IPVBATT + ISVBATT Operating Current

VCCA = 5V, VCCB = 0V, ICCA = 0µA

250

400

µA

VCCA = VCCB = 5V, ICCA = ICCB = 0µA

350

500

µA

IPVBATT + ISVBATT Shutdown Current

No Cards Present, VCPO = 0V

0.75

1.75

µA

DVCC Operating Voltage

1.7

5.5

IDVCC Operating Current

µA

IDVCC Shutdown Current

0.5

1.5

µA

Charge Pump

ROLCP 5V Mode Open-Loop

VBATT = 3.075V, ICPO = ICCA + ICCB = 120mA, (Note 3) q

5.7

8.5

Ω

Output Resistance

CPO Turn On Time

ICCA/B = 0mA, 10% to 90%

0.6

1.5

32 31 30 29 28 27 26 25

10 11 12 13 14 15 16

DVCC

PRES A

C8A

C4A

I/O A

RST A

CLK A

VCCA

FAULT

UNDERV

NC/NO

PRES B

I/O B

RST B

CLK B

VCCB

UH PACKAGE

32-LEAD PLASTIC QFN

PIN 1

TOP VIEW

UH PART MARKING

1955

LTC1955 Datasheet(PDF) 2 Page - Linear Technology

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