Cypress Capacitance, AC Test Loads and Waveforms, TTL AC Test Load CY7B991, CY7B991 CY7B992

CY7B991

CY7B992

Capacitance

CMOS output buffer current and power dissipation specified at 50 MHz reference frequency.
Parameter	Description	Test Conditions	Max	Unit
CIN	Input Capacitance	TA = 25°C, f = 1 MHz, VCC = 5.0V	10	pF

AC Test Loads and Waveforms
	5V		3.0V
	R1	R1=130	2.0V
		R2=91	Vth =1.5V
		CL = 50 pF (CL =30 pF for –2 and –5 devices)	0.8V
CL	R2	(Includes fixture and probe capacitance)	0.0V
			≤1ns

2.0V

Vth =1.5V 0.8V

≤1ns

TTL AC Test Load (CY7B991) TTL Input Test Waveform (CY7B991)

	VCC
		R1
CL		R2

R1=100

R2=100

CL = 50 pF (CL =30 pF for –2 and –5 devices) (Includes fixture and probe capacitance)

80%

Vth = VCC/2

20%

0.0V

≤3ns

VCC

80%

Vth = VCC/2

20%

≤3ns

CMOS AC Test Load (CY7B992) CMOS Input Test Waveform (CY7B992)

Document Number: 38-07138 Rev. *B Page 7 of 19

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