SN74V3640 datasheet(34/50 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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34 / 50 page

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

34

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

tENS

WCLK

RCLK

REN

RT

OR

PAF

HF

PAE

12

1

2

WEN

3

4

tENS

tENH

tRTS

tENH

tA

tsk2

tENS

tENH

tREF

tPAES

tHF

Q0–Qn

Wx

Wx + 1

W4

tPAFS

tRTS

tA

W1 (see Note D)

W2 (see Note D)

W3 (see Note D)

NOTES: A. Retransmit setup is complete after OR returns low.

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

low throughout the retransmit setup procedure.

D = 1025 for the SN74V3640, D = 2049 for the SN74V3650, D = 4097 for the SN74V3660, D = 8193 for the SN74V3670, D = 16385

for the SN74V3680, and D = 32769 for the SN74V3690.

C. OE = low

D. W1, W2, W3 = first, second, and third words written to the FIFO after master reset

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

F. RM is set high during MRS.

Figure 9. Retransmit Timing (FWFT Mode)

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SN74V3640 Datasheet(PDF) 34 Page - Texas Instruments

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