Power-up/down characteristics, Capacitance, Ac test conditions – Rainbow Electronics DS1511 User Manual

Page 6: Figure 4. burst mode timing waveform

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DS1501/DS1511 Y2KC Watchdog Real-Time Clocks

6 of 20

Figure 4. Burst Mode Timing Waveform

A 0 –A 4

D Q 0 – D Q 7

O E , W E , O R C E

1 3 h

PW

H IG H

PW

L OW

POWER-UP/DOWN CHARACTERISTICS

PARAMETER SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CE or WE at V

IH

Before Power-Fail

t

PF

0 ms

V

CC

Fall Time: V

PF(MAX)

to V

PF(MIN)

t

F

300 ms

V

CC

Fall Time: V

PF(MIN)

to V

SO

t

FB

10 ms

V

CC

Rise Time: V

PF(MIN)

to V

PF(MAX)

t

R

0 ms

V

PF

to

RST High

t

REC

35 200

ms

(T

A

= +25°C)

PARAMETER SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Expected Data Retention Time
(Oscillator On)

t

DR

(Note

9)

10 years

CAPACITANCE

(T

A

= +25°C)

PARAMETER SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Capacitance on All Input Pins

C

IN

10 pF

Capacitance on

IRQ, PWR, RST, and DQ

Pins

C

IO

10 pF

AC TEST CONDITIONS

OUTPUT LOAD

INPUT PULSE

LEVELS

TIMING MEASUREMENT

REFERENCE LEVELS

INPUT PULSE RISE

AND FALL TIMES

(Y) 50pF + 1TTL Gate

Input: 1.5V

(W) 25pF + 1 TTL Gate

0V to 3.0V for 5V

operation

Output: 1.5V

5ns

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