74FCT388915TEJG8 IDT, 74FCT388915TEJG8 Datasheet - Page 9

• Manufacturer Part Number: 74FCT388915TEJG8
• Description: Clock Drivers & Distribution
• Manufacturer: IDT

Specifications of 74FCT388915TEJG8

• Rohs: yes
• Part # Aliases: IDT74FCT388915TEJG8

TEST CIRCUITS AND WAVEFORMS
NOTES:
1. The FCT388915T aligns rising edges of the FEEDBACK input and SYNC input, therefore the SYNC input does not require a 50% duty cycle.
2. All skew specs are measured between the V
3. If a Q ouput is connected to the FEEDBACK input (this situation is not shown), the Q output frequency would match the SYNC input frequency, the 2Q output would run at twice
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
2. Pulse Generator for All Pulses: t
Q/2 OUTPUT
IDT74FCT388915T
3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER (3-STATE)
Q5 OUTPUT
SYNC IN PUT
(SYNC (1) or
SYNC (0))
2Q OUTPUT
FEED BAC K
INPUT
NORMALLY
NORMALLY
the SYNC frequency and the Q/2 output would run at half the SYNC frequency.
t
Q0-Q4
OUTPUTS
SKEW ALL
CONTROL
OUTPUT
OUTPUT
Generator
Pulse
INPUT
HIGH
LOW
SW ITCH
SW ITCH
GND
ENABLE
(These waveforms represent the configuration of Figure 3a)
V
IN
t
t
6V
PZH
PZL
R
Enable and Disable Times
T
50 Ω Ω Ω Ω Ω to V
Propagation Delay, Output Skew
t
P D
D.U.T.
1.5V
1.5V
3V
0V
t
V
SKEW f
C C
F
t
≤ 2.5ns; t
PHZ
CC
t
CYCLE
D ISABLE
/2, C
t
V
PLZ
OU T
t
CC
R
SKEW r
L
SYNC IN PUT
≤ 2.5ns.
/2 crossing point of the appropriate output edges. All skews are specified as "windows", not as ± deviation around a center point.
= 20pF
0.3V
0.3V
V
CC
t
100
100
CYCLE
V
V
3V
1.5V
0V
3V
0V
OL
O H
Ω
Ω
t
"Q" OUTPUTS
SKEW f
20pF
C
L
9
t
SWITCH POSITION
DEFINITIONS:
C
R
SKEW r
1.5V
L
T
V
V
V
V
V
CC/2
CC/2
CC/2
CC/2
CC/2
= Load capacitance: includes jig and probe capacitance.
= Termination resistance: should be equal to Z
Generator
Pulse
Disable High
Disable Low
Enable High
Enable Low
Test
V
IN
Enable and Disable Test Circuit
R
T
D.U.T.
V
COMMERCIAL TEMPERATURE RANGE
C C
V
OU T
OUT
of the Pulse Generator.
500
500
Switch
Ω
Ω
GND
6V
6.0V
GND