IDT5T905PGI datasheet(10/17 Pages) IDT

Part #	IDT5T905PGI

Description	2.5V SINGLE DATA RATE 1:5 CLOCK BUFFER TERABUFFER

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Manufacturer	IDT [Integrated Device Technology]

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INDUSTRIALTEMPERATURERANGE

10

IDT5T905

2.5VSINGLEDATARATE1:5CLOCKBUFFERTERABUFFER

NOTES:

1. See RECOMMENDED OPERATING RANGE table.

2. For 1.8V LVTTL single-ended operation, the RxS pin is allowed to float or tied to VDD/2 and A/VREF is tied to GND.

3. VDIF specifies the minimum input differential voltage (VTR - VCP) required for switching where VTR is the "true" input level and VCP is the "complement" input level. Differential mode

only. The DC differential voltage must be maintained to guarantee retaining the existing HIGH or LOW input. The AC differential voltage must be achieved to guarantee switching

to a new state.

4. VCM specifies the maximum allowable range of (VTR + VCP) /2. Differential mode only.

5. For single-ended operation in differential mode, A/VREF is tied to the DC voltage VREF. The input is guaranteed to toggle within ±200mV of VREF when VREF is constrained within

+600mV and VDDI-600mV, where VDDI is the nominal 1.8V power supply of the device driving the A input. To guarantee switching in voltage range specified in the JEDEC 1.8V

LVTTL interface specification, VREF must be maintained at 900mV with appropriate tolerances.

6. Voltage required to maintain a logic HIGH, single-ended operation in differential mode.

7. Voltage required to maintain a logic LOW, single-ended operation in differential mode.

8. Typical values are at VDD = 2.5V, VDDQ = 1.8V, +25°C ambient.

9. The reference clock input is capable of HSTL, eHSTL, LVEPECL, 1.8V or 2.5V LVTTL operation independent of the device output. The correct input interface table should be

referenced.

10. This value is the worst case minimum VIH over the specification range of the 1.8V power supply. The 1.8V LVTTL specification is VIH = 0.65 • VDD where VDD is 1.8V ± 0.15V.

However, the LVTTL translator is supplied by a 2.5V nominal supply on this part. To ensure compliance with the specification, the translator was designed to accept the calculated

worst case value ( VIH = 0.65 • [1.8 - 0.15V]) rather than reference against a nominal 1.8V supply.

11. This value is the worst case maximum VIL over the specification range of the 1.8V power supply. The 1.8V LVTTL specification is VIL = 0.35 • VDD where VDD is 1.8V ± 0.15V.

However, the LVTTL translator is supplied by a 2.5V nominal supply on this part. To ensure compliance with the specification, the translator was designed to accept the calculated

worst case value ( VIH = 0.35 • [1.8 + 0.15V]) rather than reference against a nominal 1.8V supply.

12. For differential mode (RxS = LOW), A and A/VREF must be at the opposite rail.

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE FOR 1.8V

LVTTL(1)

Symbol

Parameter

Test Conditions

Min.

Typ.(8)

Max

Unit

InputCharacteristics

IIH

Input HIGH Current(12)

VDD = 2.6V

VI = VDDQ/GND

—

±5

µA

IIL

InputLOWCurrent(12)

VDD = 2.6V

VI = GND/VDDQ

——

±5

VIK

ClampDiodeVoltage

VDD = 2.4V, IIN = -18mA

—

- 0.7

- 1.2

V

VIN

DCInputVoltage

- 0.3

VDDQ + 0.3

V

Single-Ended Inputs(2)

VIH

DC Input HIGH

1.073(10)

—V

VIL

DC Input LOW

—

0.683(11)

V

DifferentialInputs

VDIF

DCDifferentialVoltage(3,9)

0.2

—

V

VCM

DC Common Mode Input Voltage(4,9)

825

900

975

mV

VIH

DC Input HIGH(5,6,9)

VREF + 100

—

mV

VIL

DC Input LOW(5,7,9)

—VREF - 100

mV

VREF

Single-EndedReferenceVoltage(5,9)

—

900

—

mV

OutputCharacteristics

VOH

Output HIGH Voltage

IOH = -6mA

VDDQ - 0.4

—

V

IOH = -100

µAVDDQ - 0.1

—

V

VOL

OutputLOWVoltage

IOL = 6mA

—

0.4

V

IOL = 100

µA

—

0.1

V

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