Rainbow-electronics DS1254 Manual do Utilizador descarregar pdf (Página 12)

DS1254

12 of 17

Figure 9. POWER-UP/POWER-DOWN WAVEFORM TIMING (Note 14)

PF(max)

PF(min)

BAT

REC

BPU

Slews with V

POWER-UP/POWER-DOWN CHARACTERISTICS (V

= 5V±10%)

PARAMETER SYMBOL

MIN TYP MAX UNITS NOTES

CE and WE at V

Before Power Down

µS

Fall Time: V

PF(max)

to V

PF(min)

300

µS

Fall Time: V

PF(min)

to V

BAT

µS

Rise Time: 0V to V

PF(min)

150

µS

Valid to End of Write Protection t

REC

125 mS

Valid to BW Valid

BPU

1 Sec 3

= +25

C )

PARAMETER SYMBOL

MIN TYP MAX UNITS NOTES

Expected Data Retention Time

(Oscillator On)

10 years 4

Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is

in battery-backup mode.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17

2M x 8 NV SRAM with 1
Phantom Clock 1
Figure 1. PIN ASSIGNMENT 2
DESCRIPTION 2
RAM READ MODE 3
RAM WRITE MODE 3
DATA RETENTION MODE 3
PHANTOM CLOCK OPERATION 3
4 of 17 4
5 of 17 5
AM/PM/12/24 MODE 6
OSCILLATOR BIT 6
ZERO BITS 6
BATTERY MONITORING 6
7 of 17 7
8 of 17 8
C to +70 9
= 3.3V±10%) 9
12 of 17 12
13 of 17 13
14 of 17 14
DS1254 PACKAGE DIMENSIONS 15
16 of 17 16
17 of 17 17

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