CAT28C257

5

Doc. No. 1015, Rev. D

Note:

(1)

This parameter is tested initially and after a design or process change that affects the parameter.

(2)

Input rise and fall times (10% and 90%) < 10 ns.

(3)

A write pulse of less than 20ns duration will not initiate a write cycle.

(4)

Figure 1. A.C. Testing Input/Output Waveform(2)

1.3V

DEVICE

UNDER

TEST

1N914

3.3K

CL = 100 pF

OUT

CL INCLUDES JIG CAPACITANCE

Figure 2. A.C. Testing Load Circuit (example)

INPUT PULSE LEVELS

REFERENCE POINTS

2.0 V

0.8 V

VCC - 0.3V

0.0 V

A.C. CHARACTERISTICS, Write Cycle

±10%, unless otherwise specified

28C257-12

28C257-15

Symbol

Parameter

Min

Typ

Max

Min

Typ

Max

Units

Write Cycle Time

5

5

ms

Address Setup Time

0

0

ns

Address Hold Time

50

50

ns

CE Setup Time

0

0

ns

CE Hold Time

0

0

ns

CE Pulse Time

100

100

ns

OE Setup Time

0

0

ns

OE Hold Time

0

0

ns

WE Pulse Width

100

100

ns

Data Setup Time

50

50

ns

Data Hold Time

0

0

ns

Write Inhibit Period After Power-up

5

10

5

10

ms

Byte Load Cycle Time

0.1

100

0.1

100

µs