LH540215 datasheet(3/48 Pages) SHARP

Part #	LH540215

Description	512 x 18 / 1024 x 18 Synchronous FIFO

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Manufacturer	SHARP [Sharp Corporation]

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In the Enhanced Operating Mode, coordinated op-

eration of two 18-bit FIFOs as one 36-bit FIFO may be

ensured by ‘interlocked’ crosscoupling of the status-

flag outputs from each FIFO to the expansion inputs

of the other one; that is, FF to WXI/WEN2, and EF to

RXI/REN2, in both directions between two paralleled

FIFOs. This ‘interlocked’ operation takes effect

automatically, if two paralleled FIFOs are crosscon-

nected in this manner, with the EMODE control input

being asserted (LOW). (See Tables 1 and 2, also

Figures 27 and 30.) IDT-compatible depth cascading

no longer is available when operating in this ‘inter-

locked-paralleled’ mode; however, pipelined depth

cascading remains available.

TOP VIEW

540215-2

3

2

1

6867 66 6564 63

6261

9

8

76

54

16

17

18

19

20

23

24

21

22

26

15

11

12

13

14

10

25

D2

D0

D13

D14

D11

D12

D9

D10

D8

VCC

D7

D5

D6

D3

D4

D1

55

54

53

52

51

48

47

50

49

46

44

60

59

58

57

56

45

Q11

VCC

Q10

Q9

Q8

Q7

EMODE

*

Q6

Q5

Q4

VCC

Q14

Q13

Q12

33 34

35 36 37 38 39 40 41

42 43

27 28 29 30 31 32

VSS

BOLD ITALIC = Enhanced Operating Mode.

* This pin is V

CC on IDT pinout; if EMODE pin is simply

biased to VCC, part will behave identical to IDT functionality.

68-PIN PLCC

Figure 2. Pin Connections for 68-Pin PLCC Package

BOLD ITALIC = Enhanced Operating Mode

512 x 18/1024 x 18 Synchronous FIFO

LH540215/25

3

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Similar Description - LH540215

Manufacturer	Part #	Datasheet	Description
Integrated Device Techn...	IDT72511	434Kb / 28P	PARALLEL BIDIRECTIONAL FIFO 512 x 18 & 1024 x 18
	IDT72510	440Kb / 32P	BUS-MATCHING BIDIRECTIONAL FIFO 512 x 18-BIT . 1024 x 9-BIT 1024 x 18-BIT . 2048 x 9-BIT
	IDT72205LB	181Kb / 16P	CMOS SyncFIFOO 256 x 18, 512 x 18, 1024 x 18, 2048 x 18 and 4096 x 18
Sharp Corporation	LH543611	475Kb / 57P	512 x 36 x 2 / 1024 x 36 x 2 Synchronous Bidirectional FIFO
Texas Instruments	SN74V215	590Kb / 43P	[Old version datasheet] 512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
	SN74V215	600Kb / 43P	[Old version datasheet] 512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
	SN74V215	555Kb / 40P	[Old version datasheet] 512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
Sharp Corporation	LH543620	269Kb / 38P	1024 x 36 Synchronous FIFO
Integrated Device Techn...	IDT72V205	214Kb / 25P	3.3 VOLT CMOS SyncFIFO 256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18, and 4,096 x 18
Cypress Semiconductor	CY7C4205	689Kb / 25P	256/512/1K/4K x 18 Synchronous FIFOs

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