WMS128K8-XXX
White Electronic Designs
AC CHARACTERISTICS
VCC = 5.0V, GND = 0V, -55°C TA < 125°C
-15
-17
-20
-25
-35
-45
-55
Parameter Read Cycle
Symbol
Unit
Min Max Min Max Min Max Min Max Min Max Min Max Min Max
Read Cycle Time
tRC
tAA
15
0
17
0
20
0
25
0
35
0
45
0
55
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
Address Access Time
15
17
20
25
35
45
55
Output Hold from Address Change
Chip Select Access Time
tOH
tACS
tOE
15
10
17
10
20
12
25
15
35
20
45
25
55
30
Output Enable to Output Valid
Chip Select to Output in Low Z
Output Enable to Output in Low Z
Chip Disable to Output in High Z
Output Disable to Output in High Z
1. This parameter is guaranteed by design but not tested.
1
tCLZ
3
0
3
0
3
0
3
0
3
0
3
0
3
0
1
tOLZ
1
tCHZ
10
10
10
10
10
10
12
12
20
20
20
20
20
20
1
tOHZ
AC CHARACTERISTICS
VCC = 5.0V, GND = 0V, -55°C TA < 125°C
-15 -17 -20
Min Max Min Max Min Max Min Max Min Max Min Max Min Max
-25
-35
-45
-55
Parameter Write Cycle
Symbol
Unit
Write Cycle Time
tWC
tCW
tAW
tDW
tWP
tAS
15
14
14
10
14
0
17
14
15
10
14
0
20
15
15
12
15
0
25
20
20
15
20
0
35
25
25
20
25
0
45
30
30
25
30
0
55
45
45
25
45
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Chip Select to End of Write
Address Valid to End of Write
Data Valid to End of Write
Write Pulse Width
Address Setup Time
Address Hold Time
tAH
0
0
0
0
0
0
0
1
Output Active from End of Write
Write Enable to Output in High Z
Data Hold Time
tOW
3
3
3
3
4
4
4
1
tWHZ
10
10
12
15
20
25
25
tDH
0
0
0
0
0
0
0
1. This parameter is guaranteed by design but not tested.
AC TEST CIRCUIT
AC TEST CONDITIONS
Parameter
Typ
Unit
Input Pulse Levels
V
IL = 0, VIH = 3.0
V
ns
V
IOL
Input Rise and Fall
5
Current Source
Input and Output Reference Level
Output Timing Reference Level
1.5
1.5
V
VZ ≈ 1.5V
(Bipolar Supply)
D.U.T.
Notes:
Z is programmable from -2V to +7V.
OL & IOH programmable from 0 to 16mA.
Tester Impedance Z0 = 75Ω.
Z is typically the midpoint of VOH and VOL
OL & IOH are adjusted to simulate a typical resistive load circuit.
ATE tester includes jig capacitance.
Ceff = 50 pF
V
I
V
I
.
IOH
Current Source
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
September 2002
Rev. 5
3
White Electronic Designs Corporation • (602) 437-1520 • www.whiteedc.com