Rainbow-electronics DS1511 Manual de usuario descargar pdf (Pagina 6)

DS1501/DS1511 Y2KC Watchdog Real-Time Clocks

6 of 20

Figure 4. Burst Mode Timing Waveform

A0–A4

DQ0–DQ7

O

E, WE, OR CE

13h

PW

HIGH

PW

LOW

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

1 2 3 4 5 6 7 8 9 10 11 ... 19 20

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