IDT74FCT388915T100JB datasheet(10/11 Pages) IDT

Part #	IDT74FCT388915T100JB

Description	3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER WITH (3-STATE)

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Manufacturer	IDT [Integrated Device Technology]

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IDT54/74FCT388915T 70/100/133/150

3.3V LOW SKEW PLL-BASED CMOS CLOCK DRIVER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

9.8

10

ENABLE AND DISABLE TEST CIRCUIT

TEST CIRCUITS AND WAVEFORMS

50

Ω TO VCC/2, CL = 20PF

PROPAGATION DELAY, OUTPUT SKEW

t

SYNC INPUT

t

"Q" OUTPUTS

t

tPD

SYNC INPUT

(SYNC (1) or

SYNC (0))

FEEDBACK

INPUT

Q/2 OUTPUT

Q0-Q4

OUTPUTS

Q5 OUTPUT

2Q OUTPUT

t

SKEWf

SKEWr

SKEWf

SKEWALL

SKEWr

CYCLE

1.5V

VCC/2

1.5V

VCC/2

(These waveforms represent the configuration of Figure 3a)

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 VCC/2 crossing point of the appropriate output edges. All skews are specified as "windows", not as

± deviation

around a center point.

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 the SYNC frequency and the Q/2 output would run at half the SYNC frequency.

ENABLE AND DISABLE TIMES

CONTROL

INPUT

3V

1.5V

0V

3V

0V

OUTPUT

NORMALLY

LOW

OUTPUT

NORMALLY

HIGH

SWITCH

6V

SWITCH

GND

VOL

0.3V

tPLZ

tPZL

tPZH

tPHZ

3V

0V

1.5V

ENABLE

DISABLE

VOH

3052 drw 07

3052 drw 08

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

SWITCH POSITION

Test

Switch

Disable Low

Enable Low

6V

Disable High

Enable High

GND

3052 tbl 10

DEFINITIONS:

CL=

Load capacitance: includes jig and probe capacitance.

RT = Termination resistance: should be equal to ZOUT of the Pulse

Generator.

Pulse

Generator

D.U.T.

VCC

VIN

VOUT

100

Ω

100

Ω

RT

VCC

20pF

CL

3052 drw 05

Pulse

Generator

D.U.T.

VCC

VIN

VOUT

500

Ω

GND

6.0V

500

Ω

RT

3052 drw 06

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IDT74FCT388915T100JB Datasheet(PDF) 10 Page - Integrated Device Technology

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