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IDT74FCT88915TT55LB Datasheet(PDF) 10 Page - Integrated Device Technology

Part # IDT74FCT88915TT55LB
Description  LOW SKEW PLL-BASED CMOS CLOCK DRIVER (WITH 3-STATE)
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

IDT74FCT88915TT55LB Datasheet(HTML) 10 Page - Integrated Device Technology

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IDT54/74FCT88915TT 55/70/100/133
LOW SKEW PLL-BASED CMOS CLOCK DRIVER
MILITARY AND COMMERCIAL TEMPERATURE RANGES
9.7
10
TEST CIRCUITS AND WAVEFORM
50
Ω to VCC/2, CL = 20pF
PROPAGATION DELAY, OUTPUT SKEW
ENABLE AND DISABLE TEST CIRCUIT
Pulse
Generator
R T
D.U.T.
VCC
VIN
C L
V OUT
50pF
500
500
7.0V
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-
HIGH
2. Pulse Generator for All Pulses: tF
≤ 2.5ns; tR ≤ 2.5ns
3072 lnk 12
Pulse
Generator
RT
D.U.T.
VCC
VIN
VOUT
100
100
VCC
20pF
3072 drw 11
NOTES:
1. The FCT88915TT 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 1.5V crossing point of the appropriate output edges. All skews are specified as "windows", not as
± deviation
around a center point.
3. If a Q output 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 the SYNC frequency and the Q/2 output would run at half the SYNC frequency.
(These waveforms represent the hookup of Figure 2a)
t
t
t
t
tPD
SYNC INPUT
(SYNC (1) or
SYNC (0))
FEEDBACK
INPUT
Q/2 OUTPUT
Q0-Q4
OUTPUTS
Q5 OUTPUT
2Q OUTPUT
tSKEWALL
SKEWf
SKEWr
SKEWf
SKEWr
t
"Q" OUTPUTS
CYCLE
1.5V
1.5V
1.5V
1.5V
1.5V
1.5V
3072 drw 13
t CYCLE SYNC INPUT
Test
Switch
Disable Low
Enable Low
Closed
Disable High
Enable High
Open
DEFINITIONS:
CL=
Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
3072 tbl 10
CONTROL
INPUT
3V
1.5V
0V
3.5V
0V
OUTPUT
NORMALLY
LOW
OUTPUT
NORMALLY
HIGH
SWITCH
CLOSED
SWITCH
OPEN
VOL
VOH
0.3V
0.3V
t PLZ
tPZL
tPZH
t PHZ
0V
1.5V
1.5V
ENABLE
DISABLE
ENABLE AND DISABLE TIMES
SWITCH POSITION
3072 drw 14


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