Cypress CY62128EV30 Manual do Utilizador descarregar pdf (Página 5)

CY62128EV30

Document #: 38-05579 Rev. *D Page 5 of 11

Data Retention Waveform

[10]

Switching Characteristics

(Over the Operating Range)

[10, 11]

Parameter Description

45 ns (Ind’l/Auto-A) 55 ns (Auto-E)

Unit

Min Max Min Max

Read Cycle

Read Cycle Time 45 55 ns

Address to Data Valid 45 55 ns

OHA

Data Hold from Address Change 10 10 ns

ACE

CE LOW to Data Valid 45 55 ns

DOE

OE LOW to Data Valid 22 25 ns

LZOE

OE LOW to Low Z

[12]

55ns

HZOE

OE HIGH to High Z

[12,13]

18 20 ns

LZCE

LOW to Low Z

[12]

10 10 ns

HZCE

CE HIGH to High Z

[12, 13]

18 20 ns

CE LOW to Power Up

00ns

CE HIGH to Power Up 45 55 ns

Write Cycle

[14]

Write Cycle Time 45 55 ns

SCE

CE LOW to Write End 35 40 ns

Address Setup to Write End 35 40 ns

Address Hold from Write End 0 0 ns

Address Setup to Write Start 0 0 ns

PWE

WE Pulse Width

35 40 ns

Data Setup to Write End 25 25 ns

Data Hold from Write End 0 0 ns

HZWE

WE LOW to High Z

[12, 13]

18 20 ns

LZWE

WE HIGH to Low Z

[12]

10 10 ns

CC(min)

CDR

> 1.5V

DATA RETENTION MODE

Notes

10. CE

is the logical combination of CE

and CE

. When CE

is LOW and CE

is HIGH, CE is LOW; when CE

is HIGH or CE

is LOW, CE is HIGH.

11. Test Conditions for all parameters other than tri-state parameters assume signal transition time of 3 ns or less (1 V/ns), timing reference levels of V

CC(typ)

/2, input

pulse levels of 0 to V

CC(typ)

, and output loading of the specified I

as shown in the “AC Test Loads and Waveforms” on page 4.

12. At any given temperature and voltage condition, t

HZCE

is less than t

LZCE

, t

HZOE

is less than t

LZOE

, and t

HZWE

is less than t

LZWE

for any given device.

13. t

HZOE

, t

HZCE

, and t

HZWE

transitions are measured when the output enter a high impedance state.

14. The internal write time of the memory is defined by the overlap of WE

, CE = V

. All signals must be ACTIVE to initiate a write and any of these signals can

terminate a write by going INACTIVE. The data input setup and hold timing should be referenced to the edge of the signal that terminates the write.

[+] Feedback

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