MCM67C518

5

MOTOROLA FAST SRAM

AC OPERATING CONDITIONS AND CHARACTERISTICS

(VCC = 5.0 V ± 5% TA = 0 to + 70°C, Unless Otherwise Noted)

Input Timing Measurement Reference Level

1.5 V

. . . . . . . . . . . . . . .

Input Pulse Levels

0 to 3.0 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input Rise/Fall Time

3 ns

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output Timing Reference Level

1.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . .

Output Load

See Figure 1A Unless Otherwise Noted

. . . . . . . . . . . .

MCM67C518–6

MCM67C518–7

MCM67C518–9

Parameter

Symbol

Min

Max

Min

Max

Min

Max

Unit

Notes

Cycle Time

tKHKH

10

—

12.5

—

15

—

ns

Clock Access Time

tKHQV

—

6

—

7

—

9

ns

5

Output Enable to Output Valid

tGLQV

—

5

—

5

—

6

ns

Clock High to Output Active

tKHQX1

2

—

2

—

2

—

ns

Clock High to Output Change

tKHQX2

2

—

2

—

2

—

ns

Output Enable to Output Active

tGLQX

0

—

0

—

0

—

ns

Output Disable to Q High–Z

tGHQZ

—

6

—

6

—

6

ns

6

Clock High to Q High–Z

tKHQZ

2

6

2

6

2

6

ns

Clock High Pulse Width

tKHKL

4

—

5

—

5

—

ns

Clock Low Pulse Width

tKLKH

4

—

5

—

5

—

ns

Setup Times:

Address

Address Status

Data In

Write

Address Advance

Chip Enable

tAVKH

tADSVKH

tDVKH

tWVKH

tADVVKH

tEVKH

2.5

—

2.5

—

2.5

—

ns

7

Hold Times:

Address

Address Status

Data In

Write

Address Advance

Chip Enable

tKHAX

tKHADSX

tKHDX

tKHWX

tKHADVX

tKHEX

0.5

—

0.5

—

0.5

—

ns

7

NOTES:

1. In setup and hold times, W (write) refers to either one or both byte write enables LW and UW.

2. A read cycle is defined by UW and LW high or ADSP low for the setup and hold times. A write cycle is defined by LW or UW low and ADSP

high for the setup and hold times.

3. All read and write cycle timings are referenced from K or G.

4. G is a don’t care when UW or LW is sampled low.

5. Maximum access times are guaranteed for all possible i486 and Pentium external bus cycles.

6. Transition is measured

± 500 mV from steady–state voltage with load of Figure 1B. This parameter is sampled rather than 100% tested. At

any given voltage and temperature, tKHQZ max is less than tKHQZ1 min for a given device and from device to device.

7. This is a synchronous device. All addresses must meet the specified setup and hold times for

ALL rising edges of K whenever ADSP or ADSC

is low, and the chip is selected. All other synchronous inputs must meet the specified setup and hold times for

ALL rising edges of K when

the chip is enabled. Chip enable must be valid at each rising edge of clock for the device (when ADSP or ADSC is low) to remain enabled.

AC TEST LOADS

Figure 1A

Figure 1B

5 pF

+ 5 V

OUTPUT

480

Ω

255

Ω

OUTPUT

Z0 = 50 Ω

RL = 50 Ω

VL = 1.5 V