Philips Semiconductors

Product specification

74F764-1/74F765-1

DRAM dual-ported controllers

2

1992 Aug 10

853-0878 07412

FEATURES

RAM

refresh

RAMs

dynamic RAMs

times down to 40ns

switching

DESCRIPTION

The 74F764-1/765-1 DRAM Dual-ported Controller is a high-speed

synchronous dual-port arbiter and timing generator that allows two

microprocessors, microcontrollers, or any other memory accessing

device to share the same block of DRAM. The device performs

arbitration, signal timing, address multiplexing, and refresh address

generation, replacing up to 25 discrete devices.

74F764-1 vs. 74F765-1

The 74F764-1, though functionally and pin-to-pin compatible with

the 74F765-1, differs from the later in that it has an on-chip address

input latch. This is useful in systems that have unlatched or

multiplexed address and data bus.

The specialized outputs eliminate the need for signal terminations in

essentially all applications.

Both devices are available in 40-pin plastic DIP or 44-pin PLCC with

pinouts designed to allow convenient placement of microprocessors,

DRAMs, and other support chips.

ORDERING INFORMATION

DESCRIPTION

COMMERCIAL RANGE

DRAWING NUMBER

40-Pin Plastic Dual In-line Package

74F764-1N, 74F765-1N

SOT129–1

44-Pin Plastic Leaded Chip Carrier

74F764-1A, 74F765-1A

SOT187–2

PIN CONFIGURATIONS

N Package

24

23

22

21

20

19

18

17

16

15

28

27

12

10

11

9

8

7

6

5

4

3

2

1

14

13

26

25

29

30

31

32

33

34

35

36

37

38

39

40 RCP

WG

GNT

CASEN

DTACK

RAS

MA0

MA1

MA2

GND

MA3

MA4

MA5

MA6

MA7

MA8

CP

SEL2

REQ2

REQ1

A1

A10

A2

A11

A3

A12

A4

A13

A5

A14

VCC

A6

A15

A7

A16

A8

A17

A9

A18

SEL1

SF00703

6

5

4

3

2

1

44 43 42 41 40

39

38

37

36

35

34

33

32

31

30

29

7

8

9

10

11

12

13

14

15

16

17

18 19 20 21 22

23 24 25 26 27 28

A Package

RAS

MA0

MA1

MA2

GND

GND

MA3

MA4

MA5

MA6

MA7

MA8

CP NC

SEL2

REQ2

REQ1

SEL1

NC

A18

A9

NC

A6

A15

A7

A16

A8

A17

A4

A13

A5

A14

VCC

A1

A10

A2

A11

A3

A12

RCP WG GNT

CASEN

DTACK

SF00685