Cypress CY7C139, CY7C138 manual Switching Characteristics Over the Operating Range9, Output, Gnd

CY7C138, CY7C139

Figure 2. AC Test Loads and Waveforms

OUTPUT

C = 30 pF

5V
	R1 = 893Ω			RTH = 250Ω
			OUTPUT
		R2 = 347Ω	C = 30pF

OUTPUT

C = 5 pF

VTH = 1.4V

5V

R1 = 893Ω

R2 = 347Ω

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

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

ALL INPUT PULSES

90% 90%

10%

< 3 ns

Switching Characteristics Over the Operating Range[9]

					7C138-15		7C138-25		7C138-35		7C138-55
	Parameter			Description	7C139-15		7C139-25		7C139-35		7C139-55		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			3		3		3		3		ns
tACE				LOW to Data Valid		15		25		35		55	ns
		CE
tDOE				LOW to Data Valid		10		15		20		25	ns
		OE
t	[10,11,12]			Low to Low Z	3		3		3		3		ns
		OE
	LZOE
t	[10,11,12]			HIGH to High Z		10		15		20		25	ns
		OE
	HZOE
t	[10,11,12]		LOW to Low Z		3		3		3		3		ns
		CE
	LZCE
t	[10,11,12]		HIGH to High Z			10		15		20		25	ns
		CE
	HZCE
t	[12]		LOW to Power-Up		0		0		0		0		ns
		CE
	PU
t	[12]		HIGH to Power-Down			15		25		35		55	ns
		CE
	PD
	WRITE CYCLE
tWC		Write Cycle Time			15		25		35		55		ns
tSCE			LOW to Write End		12		20		30		40		ns
		CE
tAW		Address Set-Up to Write End			12		20		30		40		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		30		ns
tSD		Data Set-Up to Write End			10		15		15		20		ns

Note

8. Tested initially and after any design or process changes that may affect these parameters.

Document #: 38-06037 Rev. *D Page 5 of 17

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