SN74V3640 datasheet(33/50 Pages) TI

Part #	SN74V3640

Description	1024 횞 36, 2048 횞 36, 4096 횞 36, 8192 횞 36, 16384 횞 36, 32768 횞 36 3.3-V CMOS FIRST-IN, FIRST-OUT MEMORIES

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Manufacturer	TI [Texas Instruments]

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SN74V3640, SN74V3650, SN74V3660, SN74V3670, SN74V3680, SN74V3690

1024

× 36, 2048 × 36, 4096 × 36, 8192 × 36, 16384 × 36, 32768 × 36

3.3-V CMOS FIRST-IN, FIRST-OUT MEMORIES

SCAS668A – NOVEMBER 2001 – REVISED MARCH 2003

33

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

W2

(see

Note C)

WCLK

RCLK

REN

RT

EF

PAF

HF

PAE

12

1

2

WEN

tENS

tENH

tENS

tENH

tA

tsk2

tENS

tENH

tREF

tPAES

tHF

tPAFS

Q0–Qn

Wx

Wx + 1

tRTS

W1 (see Note C)

NOTES: A. Retransmit setup is complete after EF returns high; only then can a read operation begin.

B. OE = low

C. W1 = first word written to the FIFO after master reset, W2 = second word written to the FIFO after master reset

D. No more than (D – 2) words may be written to the FIFO between reset (master or partial) and retransmit setup. Therefore, FF is

high throughout the retransmit setup procedure.

D = 1024 for the SN74V3640, D = 2048 for the SN74V3650, D = 4096 for the SN74V3660, D = 8192 for the SN74V3670, D = 16384

for the SN74V3680, and D = 32768 for the SN74V3690.

E. There must be at least two words written to and two words read from the FIFO before a retransmit operation can be invoked.

F. RM is set high during MRS.

Figure 8. Retransmit Timing (Standard Mode)

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