6.42

71321SA/LA and 71421SA/LA

High Speed 2K x 8 Dual-Port Static RAM with Interrupts

Industrial and Commercial Temperature Ranges

9

AC Electrical Characteristics Over the

Operating Temperature and Supply Voltage Range(4)

NOTES:

1. Transition is measured 0mV from Low or High-impedance voltage with Output Test Load (Figure 2). This parameter is guaranteed by

device characterization but is not production tested.

2. For Master/Slave combination, tWC = tBAA + tWP, since R/W = VIL must occur after tBAA .

3. If OE is LOW during a R/W controlled write cycle, the write pulse width must be the larger of tWP or (tWZ + tDW) to allow the I/O drivers to turn off data to be

placed on the bus for the required tDW. If OE is HIGH during a R/W controlled write cycle, this requirement does not apply and the write pulse can be as short

as the specified tWP.

4. 'X' in part numbers indicates power rating (SA or LA).

Symbol

Parameter

71321X20

71421X20

Com'l Only

71321X25

71421X25

Com'l

& Ind

Unit

Min.

Max.

Min.

Max.

WRITE CYCLE

tWC

Write Cycle Time(2)

20

____

25

____

ns

tEW

Chip Enable to End-of-Write

15

____

20

____

ns

tAW

Address Valid to End-of-Write

15

____

20

____

ns

tAS

Address Set-up Time

0

____

0

____

ns

tWP

Write Pulse Width(3)

15

____

15

____

ns

tWR

Write Recovery Time

0

____

0

____

ns

tDW

Data Valid to End-of-Write

10

____

12

____

ns

tHZ

Output High-Z Time(1)

____

10

____

10

ns

tDH

Data Hold Time

0

____

0

____

ns

tWZ

Write Enable to Output in High-Z(1)

____

10

____

10

ns

tOW

Output Active from End-of-Write(1)

0

____

0

____

ns

2691 tbl 09a

Symbol

Parameter

71321X35

71421X35

Com'l Only

71321X55

71421X55

Com'l

& Ind

Unit

Min.

Max.

Min.

Max.

WRITE CYCLE

tWC

Write Cycle Time(2)

35

____

55

____

ns

tEW

Chip Enable to End-of-Write

30

____

40

____

ns

tAW

Address Valid to End-of-Write

30

____

40

____

ns

tAS

Address Set-up Time

0

____

0

____

ns

tWP

Write Pulse Width(3)

25

____

30

____

ns

tWR

Write Recovery Time

0

____

0

____

ns

tDW

Data Valid to End-of-Write

15

____

20

____

ns

tHZ

Output High-Z Time(1)

____

15

____

25

ns

tDH

Data Hold Time

0

____

0

____

ns

tWZ

Write Enable to Output in High-Z(1)

____

15

____

30

ns

tOW

Output Active from End-of-Write(1)

0

____

0

____

ns

2691 tbl 09b