Cypress Semiconductor CYDC128B16 Manual do Utilizador descarregar pdf (Página 14)

CYDC128B16

Document #: 001-01638 Rev. *H Page 14 of 29

7

Figure 2. AC Test Loads and Waveforms

Switching Characteristics for V

CC

= 1.8V

Over the Operating Range

[1]

Parameter Description

CYDC128B16 CYDC128B16

Unit-40 -55

Min Max Min Max

Read Cycle

t

RC

Read cycle time 40 55 ns

t

AA

Address to data valid 40 55 ns

t

OHA

Output hold from address change 5 5 ns

t

ACE

[2]

CE LOW to data valid 40 55 ns

t

DOE

OE LOW to data valid 25 30 ns

t

LZOE

[3, 4, 5]

OE Low to Low Z 5 5 ns

t

HZOE

[3, 4, 5]

OE HIGH to High Z 15 25 ns

t

LZCE

[3, 4, 5]

CE LOW to Low Z 5 5 ns

t

HZCE

[3, 4, 5]

CE HIGH to High Z 15 25 ns

t

PU

[5]

CE LOW to power up 0 0 ns

t

PD

[5]

CE HIGH to power down 40 55 ns

t

ABE

[2]

Byte enable access time 40 55 ns

Write Cycle

t

WC

Write cycle time 40 55 ns

t

SCE

[2]

CE LOW to write end 30 45 ns

t

AW

Address valid to write end 30 45 ns

t

HA

Address hold from write end 0 0 ns

t

SA

[2]

Address setup to write start 0 0 ns

t

PWE

Write pulse width 25 40 ns

t

SD

Data setup to write end 20 30 ns

t

HD

Data hold from write end 0 0 ns

t

HZWE

[4, 5]

R/W LOW to High Z 15 25 ns

1.8V

GND

90%

90%

10%

10%

ALL INPUT PULSES

(a) Normal Load (Load 1)

R1

3.0 V/2.5 V/1.8 V

OUTPUT

R2

C = 30 pF

V

TH

= 0.8 V

OUTPUT

(b) Thévenin Equivalent (Load 1)

(c) Three-State Delay (Load 2)

R1

R2

3.0V/2.5V/1.8V

OUTPUT

R

TH

= 6 kΩ

≤ 3 ns

≤ 3 ns

including scope and jig)

(Used for t

LZ

, t

HZ

, t

HZWE

, and t

LZWE

3.0V/2.5V 1.8V

R1 1022Ω 13500Ω

R2 792Ω 10800Ω

C = 30 pF

C = 5 pF

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