CY7C145, CY7C144
Document #: 38-06034 Rev. *D Page 6 of 21
Figure 4. AC Test Loads and Waveforms
3.0V
GND
90% 90%
10%
≤3ns ≤3ns
10%
ALL INPUT PULSES
(a) Normal Load (Load1)
5V
OUTPUT
C=30pF
VTH= 1.4V
OUTPUT
C = 30pF
(b) Th éveninEquivalent (Load 1) (c) Three-State Delay (Load 3)
C=30pF
OUTPUT
Load (Load 2)
5V
OUTPUT
C=5pF
R1 = 893Ω
R2 = 347Ω
RTH= 250ΩR1 = 893Ω
R = 347Ω
Switching Characteristics Over the Operating Range[9]
Parameter Description
7C144-15
7C145-15
7C144-25
7C145-25
7C144-35
7C145-35
7C144-55
7C145-55 Unit
Min Max Min Max Min Max Min Max
READ CYCLE
tRC Read Cycle Time 15 25 35 55 ns
tAA Address to Data Valid 15 25 35 55 ns
tOHA Output Hold From Address
Change
3333ns
tACE CE LOW to Data Valid 15 25 35 55 ns
tDOE OE LOW to Data Valid 10 15 20 25 ns
tLZOE[10, 11,12] OE Low to Low Z 3 3 3 3 ns
tHZOE[10, 11,12] OE HIGH to High Z 10 15 20 25 ns
tLZCE[10, 11,12] CE LOW to Low Z 3 3 3 3 ns
tHZCE[10, 11,12] CE HIGH to High Z 10 15 20 25 ns
tPU[12] CE LOW to Power-Up 0 0 0 0 ns
tPD[12] CE HIGH to Power-Down 15 25 35 55 ns
WRITE CYCLE
tWC Write Cycle Time 15 25 35 55 ns
tSCE CE LOW to Write End 12 20 30 45 ns
tAW Address Set-Up to Write End 12 20 30 45 ns
tHA Address Hold From Write End 2 2 2 2 ns
tSA Address Set-Up to Write Start 0 0 0 0 ns
tPWE Write Pulse Width 12 20 25 40 ns
Notes
9. Test conditions assume signal transition time of 3 ns or less, timing reference levels of 1.5V, input pulse levels of 0 to 3.0V, and output loading of the specified
IOI/IOH and 30-pF load capacitance.
10.At any given temperature and voltage condition for any given device, tHZCE is less than tLZCE and tHZOE is less than tLZOE.
11.Test conditions used are Load 3.
12.This parameter is guaranteed but not tested.
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