6.42

IDT70121/IDT70125

High-Speed 2K x 9 Dual-Port Static RAM with Busy & Interrupt

Industrial and Commercial Temperature Ranges

2

APRIL 05, 2006

.

05/27/04

8

9

10

11

12

13

14

15

16

17

18

IDT70121/125J

19

46

45

44

43

42

41

40

39

38

37

36

35

INDEX

34

20

2654 drw 02

52-Pin PLCC

Description

The IDT70121/IDT70125 are high-speed 2K x 9 Dual-Port Static

RAMs. The IDT70121 is designed to be used as a stand-alone 9-bit Dual-

Port RAM or as a “MASTER” Dual-Port RAM together with the IDT70125

“SLAVE” Dual-Port in 18-bit-or-more word width systems. Using the IDT

MASTER/SLAVE Dual-Port RAM approach in 18-bit-or-wider memory

system applications results in full-speed, error-free operation without the

need for additional discrete logic.

Both devices provide two independent ports with separate control,

address, and I/O pins that permit independent, asynchronous access for

reads or writes to any location in memory. An automatic power-down

feature,controlledby

CE,permitstheon-chipcircuitryofeachporttoenter

a very low standby power mode.

The IDT70121/IDT70125 utilizes a 9-bit wide data path to allow for

Data/Control and parity bits at the user’s option. This feature is especially

usefulindatacommunicationsapplicationswhereitisnecessarytousea

parity bit for transmission/reception error checking.

Fabricated using IDT’s CMOS high-performance technology, these

devices typically operate on only 675mW of power. Low-power (L)

versions offer battery backup data retention capability with each port

typically consuming 200µW from a 2V battery.

The IDT70121/IDT70125 devices are packaged in a 52-pin PLCC.

NOTES:

2. All GND pins must be connected to ground supply.

3. Package body is approximately .75 in x .75 in x .17 in.

4. This package code is used to reference the package diagram.

5. This text does not indicate orientation of the actual part-marking.