3

LTC1555/LTC1556

(LTC1556), C1 = 0.1

ELECTRICAL CHARACTERISTICS

over the – 40

°C to 85°C temperature range by design or correlation, but

are not production tested.

Note 3: The DATA and I/O pull-down drivers must also sink current

sourced by the internal pull-up resistors.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

q

12.5

40

mA

q

4.00

4.3

4.55

V

Auxiliary Switch Resistance

q

18

30

Ω

FB Input Resistance

(LTC1556)

200

k

Ω

q

500

650

800

kHz

M0, M1, SS, RIN, CIN

q

–1

1

µA

DDRV, EN

q

–5

5

µA

DATA

q

–20

20

µA

DATA

q

1mA

M0, M1, RIN, CIN, DDRV, EN

q

0.7

V

DATA

q

V

M0, M1, RIN, CIN, DDRV, EN

q

0.2

V

DATA

q

0.4

V

DATA Source Current = 20

q

0.7

V

DATA Sink Current = – 200

µA, I/O = 0V (Note 3)

q

0.4

V

DATA Pull-up Resistance

q

13

20

28

k

Ω

DATA Output Rise/Fall Time

DATA Loaded with 30pF

q

1.3

2

µs

q

0.5

V

q

0.4

V

I/O, Source Current = 20

q

0.8

V

RST, CLK, Source Current = 20

µA

q

0.9

V

I/O, Sink Current = – 1mA, DATA or DDRV = 0V (Note 3)

q

0.4

V

RST, CLK, Sink Current = – 200

µA

q

0.4

V

I/O Pull-Up Resistance

q

6.5

10

14

k

Ω

CLK Rise/Fall Time

CLK Loaded with 30pF

q

18

ns

RST, I/O Rise/Fall Time

RST, I/O Loaded with 30pF

q

1

µs

CLK Frequency

CLK Loaded with 30pF

q

5

MHz

1

ms

6

ms

ms

range.

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: C grade device specifications are guaranteed over the 0

°C to 70°C

temperature range. In addition, C grade device specifications are assured