AC Electrical Characteristics

Symbol

Parameter

Min

Max

Units

READ TIMING

Address Valid Prior to Read Strobe

20

ns

Read Strobe Width (Note 8)

80

ns

Chip Select to Data Valid Time

80

ns

Address Hold after Read (Note 9)

3

ns

Read Strobe to Valid Data

70

ns

Read or Chip Select to TRI-STATE

60

ns

Chip Select Hold after Read Strobe

0

ns

Minimum Inactive Time between Read or Write Accesses

50

ns

WRITE TIMING

Address Valid before Write Strobe

20

ns

Address Hold after Write Strobe (Note 9)

3

ns

Chip Select to End of Write Strobe

90

ns

Write Strobe Width (Note 10)

80

ns

Data Valid to End of Write Strobe

50

ns

Data Hold after Write Strobe (Note 9)

3

ns

Chip Select Hold after Write Strobe

0

ns

INTERRUPT TIMING

Clock rollover to INTR out typically 165 ms

Note 8

Read Strobe width as used in the read timing table is defined as the period when both chip select and read inputs are low Hence read commences when

both signals are low and terminates when either signal returns high

Note 9

Hold time is guaranteed by design but not production tested This limit is not used to calculate outgoing quality levels

Note 10

Write Strobe width as used in the write timing table is defined as the period when both chip select and write inputs are low Hence write commences when

both signals are low and terminates when either signal returns high

AC Test Conditions

Input Pulse Levels

GND to 30V

Input Rise and Fall Times

6 ns (10% – 90%)

Input and Output

13V

Reference Levels

TRI-STATE Reference

Levels (Note 12)

Note 11

Note 12

Symbol

Parameter

Typ

Units

(Note 14)

Input Capacitance

5

pF

Output Capacitance

7

pF

Note 13

This parameter is not 100% tested

Note 14

Output rise and fall times 25 ns max (10%–90%) with 100 pF load

TLF9981 – 2

3