Rainbow-electronics DS1244Y Manual de usuario descargar pdf (Pagina 9)

DS1244/DS1244P

9 of 19

DC ELECTRICAL CHARACTERISTICS Over the operating range (3.3V)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Input Leakage Current

-1.0 +1.0

I/O Leakage Current

CE ³ V

≤ V

-1.0 +1.0

Output Current at 2.4V I

-1.0 mA

Output Current at 0.4V I

2.0 mA

Standby Current CE = 2.2V

CCS1

57mA

Standby Current

CE = V

- 0.5V

CCS2

2.0 3.0 mA

Operating Current t

CYC

= 70ns I

CC01

50 mA

Write Protection Voltage V

2.80 2.86 2.97 V 11

Battery Switchover Voltage

BAT

or V

V11

CAPACITANCE (T

= +25°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Input Capacitance C

510pF

Input/Output Capacitance C

I/O

510pF

MEMORY AC ELECTRICAL CHARACTERISTICS Over the operating range (5V)

DS1244Y-70

PARAMETER SYMBOL

MIN MAX

UNITS NOTES

Read Cycle Time t

70 ns

Access Time t

ACC

70 ns

OE to Output Valid

35 ns

CE to Output Valid

70 ns

OE or CE to Output Active

COE

5ns5

Output High-Z from Deselection t

25 ns 5

Output Hold from Address Change t

5ns

Write Cycle Time t

70 ns

Write Pulse Width t

50 ns 3

Address Setup Time t

0ns

Write Recovery Time t

0ns

Output High-Z from WE

ODW

25 ns 5

Output Active from WE

OEW

5ns5

Data Setup Time t

30 ns 4

Data Hold Time from WE

5ns4

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 18 19

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Rainbow-electronics DS1244Y Manual de usuario Pagina 9

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