DS1501YN Просмотр технического описания (PDF) - Maxim Integrated

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DS1501YN

Y2K-Compliant Watchdog Real-Time Clocks

Maxim Integrated 

Figure 4. Burst Mode Timing Waveform

DS1501/DS1511 Y2KC Watchdog Real-Time Clocks

A0–A4

13h

PW LOW

PW HIGH

OE, WE, OR CE

DQ0–DQ7

POWER-UP/DOWN CHARACTERISTICS

PARAMETER

CE or WE at VIH Before Power-Fail

SYMBOL

tPF

VCC Fall Time: VPF(MAX) to VPF(MIN)

tF

VCC Fall Time: VPF(MIN) to VSO

tFB

VCC Rise Time: VPF(MIN) to VPF(MAX)

tR

VPF to RST High

tREC

CONDITIONS

MIN TYP MAX UNITS

0

μs

300

μs

10

μs

0

μs

35

200

ms

(TA = +25°C)

PARAMETER

Expected Data-Retention Time

(Oscillator On)

SYMBOL

tDR

CONDITIONS

(Note 9)

CAPACITANCE

(TA = +25°C)

PARAMETER

Capacitance on All Input Pins

Capacitance on IRQ, PWR, RST, and DQ

Pins

SYMBOL

CIN

CIO

CONDITIONS

MIN TYP MAX UNITS

10

Years

MIN TYP MAX UNITS

10

pF

10

pF

AC TEST CONDITIONS

OUTPUT LOAD

(Y) 50pF + 1TTL Gate

(W) 25pF + 1 TTL Gate

INPUT PULSE

LEVELS

0V to 3.0V for 5V

operation

TIMING MEASUREMENT

REFERENCE LEVELS

Input: 1.5V

Output: 1.5V

INPUT PULSE RISE

AND FALL TIMES

5ns

6 of 22

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