Cypress CY7C144, CY7C145 manual Switching Characteristics Over the Operating Range9

CY7C145, CY7C144

Figure 4. AC Test Loads and Waveforms

5V

R1 = 893Ω

OUTPUTOUTPUT

C = 30 pF R2 = 347Ω C = 30pF

RTH = 250Ω

OUTPUT

C = 5 pF

VTH = 1.4V

5V

R1 = 893Ω

R = 347Ω

(a) Normal Load (Load1) (b) Thévenin Equivalent (Load 1) (c) Three-State Delay (Load 3)

OUTPUT		3.0V
	C = 30 pF	10%
		GND
		≤ 3 ns
Load (Load 2)

ALL INPUT PULSES

90%90%

10%

≤ 3 ns

Switching Characteristics Over the Operating Range[9]

					7C144-15		7C144-25		7C144-35		7C144-55
Parameter				Description	7C145-15		7C145-25		7C145-35		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			3		3		3		3		ns
		Change
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
t	[10, 11,12]	OE		HIGH to High Z		10		15		20		25	ns
HZOE
tLZCE[10, 11,12]		CE	LOW to Low Z		3		3		3		3		ns
t	[10, 11,12]	CE	HIGH to High Z			10		15		20		25	ns
HZCE
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.

Document #: 38-06034 Rev. *D Page 6 of 21

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