DS1302 Trickle-Charge Timekeeping Chip

11 of 16

CAPACITANCE

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

Input Capacitance

10

pF

I/O Capacitance

15

pF

AC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

200

Data to CLK Setup

(Note 6)

50

ns

280

CLK to Data Hold

(Note 6)

70

ns

800

CLK to Data Delay

(Notes 6, 7, 8)

200

ns

1000

CLK Low Time

(Note 6)

250

ns

1000

CLK High Time

(Note 6)

250

ns

0.5

CLK Frequency

(Note 6)

DC

2.0

MHz

2000

CLK Rise and Fall

500

ns

4

CE to CLK Setup

(Note 6)

1

µs

240

CLK to CE Hold

(Note 6)

60

ns

4

CE Inactive Time

(Note 6)

1

µs

280

CE to I/O High Impedance

(Note 6)

70

ns

280

SCLK to I/O High Impedance

(Note 6)

70

ns

Note 1:

Limits at -40°C are guaranteed by design and are not production tested.

Note 2:

All voltages are referenced to ground.

Note 3:

Note 4:

Note 5:

CE, SCLK, and I/O all have 40k

Ω pulldown resistors to ground.

Note 6:

Note 7:

Note 8:

Load capacitance = 50pF.

Note 9:

Note 10:

Note 11:

Note 12:

Note 13:

Typical values are at +25°C.