WSF41632-22XX Datasheet, PDF (4/14 Pages) White Electronic Designs Corporation – 128KX32 SRAM & 512Kx32 FLASH MIXED MODULE

White Electronic Designs
WSF41632-22XX
PRELIMINARY
SRAM AC CHARACTERISTICS
VCC = 5.0V, -55°C ≤ TA ≤ +125°C
Parameter
Read Cycle
Symbol
-25
Min Max
Read Cycle Time
tRC
25
Address Access Time
tAA
25
Output Hold from Address Change
tOH
0
Chip Select Access Time
tACS
25
Output Enable to Output Valid
tOE
15
Chip Select to Output in Low Z
tCLZ¹
3
Output Enable to Output in Low Z
tOLZ¹
0
Chip Disable to Output in High Z
tCHZ¹
12
Output Disable to Output in High Z tOHZ¹
12
1. This parameter is guaranteed by design but not tested.
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
SRAM AC CHARACTERISTICS
VCC = 5.0V, -55°C ≤ TA ≤ +125°C
Parameter
Write Cycle
Symbol
-25
Min Max
Write Cycle Time
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
Output Active from End of Write
Write Enable to Output in High Z
Data Hold from Write Time
tWC
25
tCW
20
tAW
20
tDW
15
tWP
20
tAS
3
tAH
0
tOW¹
3
tWHZ¹
15
tDH
0
1. This parameter is guaranteed by design but not tested.
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Current Source
D.U.T.
Ceff = 50 pf
Current Source
FIGURE 2 – AC TEST CIRCUIT
I OL
VZ ≈ 1.5V
(Bipolar Supply)
I _OH
AC Test Conditions
Parameter
Typ
Unit
Input Pulse Levels
VIL = 0, VIH = 3.0
V
Input Rise and Fall
5
ns
Input and Output Reference Level
1.5
V
Output Timing Reference Level
1.5
V
Notes:
VZ is programmable from -2V to +7V.
IOL & IOH programmable from 0 to 16mA.
Tester Impedance Z0 = 75 Ω.
VZ is typically the midpoint of VOH and VOL.
IOL & IOH are adjusted to simulate a typical resistive load circuit.
ATE tester includes jig capacitance.
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
October, 2002
Rev. 4
4
White Electronic Designs Corporation • [phone] • www.wedc.com