Cypress CY7C199 manual Switching Waveforms, Read Cycle No

CY7C199

Switching Characteristics Over the Operating Range[3,7] (continued)

				7C199-20		7C199-25		7C199-35		7C199-45
Parameter			Description	Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.	Unit
READ CYCLE
tRC		Read Cycle Time		20		25		35		45		ns
tAA		Address to Data Valid			20		25		35		45	ns
tOHA		Data Hold from Address		3		3		3		3		ns
		Change
tACE			LOW to Data Valid		20		25		35		45	ns
		CE
tDOE			LOW to Data Valid		9		10		16		16	ns
		OE
tLZOE			LOW to Low Z[8]	0		0		0		0		ns
		OE
tHZOE			HIGH to High Z[8, 9]		9		11		15		15	ns
		OE
tLZCE			LOW to Low Z[8]	3		3		3		3		ns
		CE
tHZCE			HIGH to High Z[8, 9]		9		11		15		15	ns
		CE
tPU			LOW to Power-Up	0		0		0		0		ns
		CE
tPD			HIGH to Power-Down		20		20		20		25	ns
		CE
WRITE CYCLE	[10,11]
tWC		Write Cycle Time		20		25		35		45		ns
tSCE			LOW to Write End	15		18		22		22		ns
		CE
tAW		Address Set-Up to Write End		15		20		30		40		ns
tHA		Address Hold from Write End		0		0		0		0		ns
tSA		Address Set-Up to Write Start		0		0		0		0		ns
tPWE			Pulse Width	15		18		22		22		ns
		WE
tSD		Data Set-Up to Write End		10		10		15		15		ns
tHD		Data Hold from Write End		0		0		0		0		ns
tHZWE			LOW to High Z[9]		10		11		15		15	ns
		WE
tLZWE			HIGH to Low Z[8]	3		3		3		3		ns
		WE

Switching Waveforms

Read Cycle No. 1[12, 13]

tRC

ADDRESS

tAA

tOHA

DATA OUT PREVIOUS DATA VALID DATA VALID

C199–8

Notes:

12.Device is continuously selected. OE, CE = VIL.

13.WE is HIGH for read cycle.

Document #: 38-05160 Rev. ** Page 6 of 16