HFA5251 Ver la hoja de datos (PDF) - Intersil

Número de pieza

componentes Descripción

Fabricante

HFA5251

800MHz Monolithic Pin Driver

Intersil 

HFA5251

Pin Descriptions

NAME

VCC1

VEE1

VCC2

VEE2

VHIGH

VLOW

VOUT

DATA,

DATA

HiZ,

HiZ

FUNCTION

Positive Supply. Nominal value is 10V ±0.2V. Reducing supply voltage below 9.8V will reduce positive output voltage swing. The

total supply voltage from VCC1 to VEE1 should not exceed 15.6V for normal operation or exceed 17.0V to prevent damage. Intersil

recommends two wire bonds to this pad to provide the lowest possible impedance. In addition, power supply decoupling chip

capacitors of 470pF, 0.1µF and a 10µF tantalum are recommended.

Negative Supply. Nominal value is -5.2V ±0.2V. A supply voltage more positive than -5.0V will reduce negative output voltage

swing. The total supply voltage from VCC1 to VEE1 should not exceed 15.6V for normal operation or exceed 17.0V to prevent

damage. Intersil recommends two wire bonds to this pad to provide the lowest possible impedance. In addition, power supply

decoupling chip capacitors of 470pF, 0.1µF and a 10µF tantalum are recommended.

Output Stage Positive Supply. Nominal voltage and cautions are the same as for VCC1. Having decoupling chip capacitors close

to VCC2 and VEE2 is essential since large AC current will flow through this pad to the output during transients. Normally VCC1

and VCC2 are connected together close to the die and share decoupling capacitors. Intersil recommends two wire bonds for this

pad.

Output Stage Negative Supply. Nominal voltage and cautions are the same as for VEE1. Having decoupling chip capacitors close

to VCC2 and VEE2 is essential since large AC current will flow through this pad to the output during transients. Normally VEE1

and VEE2 are connected together close to the die and share decoupling capacitors. Intersil recommends two wire bonds for this

pad.

Input Voltage High is used to set the output high level VOH. VHIGH is sensitive to capacitively coupled AC noise. Protection from

high frequency noise can be achieved with a low pass filter consisting of a 50Ω chip resistor and a 470pF chip capacitor. Without

this precaution the pin driver may oscillate due to feedback from the output through the PC board ground.

Input Voltage Low is used to set the output low level VOL. VLOW is sensitive to capacitively coupled AC noise. Protection from

high frequency noise can be achieved with a low pass filter consisting of a 50Ω chip resistor and a 470pF chip capacitor. Without

this precaution the pin driver may oscillate due to feedback from the output through the PC board ground.

Driver Output. The output impedance has been laser trimmed to match a 50Ω transmission line ±2Ω. Custom output impedance

trimming is available (contact sales office for details) to provide the best match possible to your 50Ω system.

Differential Digital Inputs used to switch VOUT to the VHIGH or VLOW level. Intersil recommends this input pair be driven by com-

plementary ECL signals to provide optimal switching speeds and timing accuracy. However a large Common Mode and Differen-

tial Voltage Range is provided to accommodate a variety of signals including single ended TTL and CMOS. When using single

ended signals the other input must be tied to an appropriate threshold.

Differential Digital Inputs used to switch VOUT from an Active to a High Impedance State. Intersil recommends that this input pair

be driven by complementary ECL signals to provide optimal switching speeds and timing accuracy. However a large Common

Mode and Differential Voltage Range is provided to accommodate a variety of signals including single ended TTL and CMOS.

When using single ended signals the other input must be tied to an appropriate threshold.

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