Cypress CY7C1550V18 用户手册
CY7C1546V18, CY7C1557V18
CY7C1548V18, CY7C1550V18
CY7C1548V18, CY7C1550V18
Document Number: 001-06550 Rev. *E
Page 22 of 28
AC Test Loads and Waveforms
Figure 4. AC Test Loads and Waveforms
1.25V
0.25V
R = 50
Ω
5 pF
INCLUDING
JIG AND
SCOPE
ALL INPUT PULSES
Device
R
L
= 50
Ω
Z
0
= 50
Ω
V
REF
= 0.75V
V
REF
= 0.75V
0.75V
Under
Test
Test
0.75V
Device
Under
Test
Under
Test
OUTPUT
0.75V
V
REF
V
REF
OUTPUT
ZQ
ZQ
(a)
Slew Rate = 2 V/ns
RQ =
250
250
Ω
(b)
RQ =
250
250
Ω
Note
21. Unless otherwise noted, test conditions assume signal transition time of 2V/ns, timing reference levels of 0.75V, V
REF
= 0.75V, RQ = 250
Ω, V
DDQ
= 1.5V, input pulse
levels of 0.25V to 1.25V, output loading of the specified I
OL
/I
OH,