74F5302 datasheet(2/10 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F5302

Fiber optic dual LED/clock driver

July 24, 1990

853-1410 00037

FEATURES

• TTL inputs

• Output enable control

• High current source and sink capability

• Matched propagation delay times (t

PLH, tPHL)

• Symmetrical rise and fall times

• ESD protection greater than 2000 volts

• Single +5V supply

• Surface mount package

APPLICATIONS

• High speed serial data communication

• Fiber optic data links

• Local area and metropolitan area networks

• Digital Television

• PBX systems

ASSOCIATED PRODUCTS

• NE5210/11/12 transimpedance amplifiers

• NE5214/5217 postamplifiers with link status indicator

• 74F5300 fiber optic LED driver

TYPE

TYPICAL

PROPAGATION

DELAY

TYPICAL SUPPLY

CURRENT( TOTAL)

74F5302

2.5ns

8mA

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

COMMERCIAL RANGE

VCC = 5V ±10%,

Tamb = 0°C to +70°C

PKG DWG #

14–pin plastic DIP

N74F5302N

SOT27-1

14–pin plastic SO

N74F5302D

SOT108-1

INPUT AND OUTPUT LOADING

AND FAN OUT TABLE

PINS

DESCRIPTION

74F (U.L.)

HIGH/LOW

LOAD VALUE

HIGH/LOW

Data inputs

1.0/1.0

µA/0.6mA

Enable inputs

1.0/1.0

µA/0.6mA

Current driver output

8000/266.6

160mA/160mA

NOTE: One (1.0) FAST unit load is defined as: 20

µA in the high

state and 0.6mA in the low state.

PIN CONFIGURATION

VCC

GND

VCC

SF00591

LOGIC DIAGRAM (ONE DRIVER)

VCC = Pin 10, 11, 12

GND = Pin 3, 4, 5

Linearizing

circuit

Output

driver

amp

TTL

input

buffer

VCC

GND

SF00592

DESCRIPTION

The 74F5302 is a dual LED/clock driver designed for use in fiber

optic links. The 74F5302 is ideally suited for use in high speed

optical high transmitter systems. It is also ideal for use as a clock

driver.

The TTL input buffer accepts TTL data. The linearizing circuits

ensures a constant propagation delay for tPLH and tPHL, and controls

the rise and fall times. The output driver amplifier is capable of

sourcing more than 160mA and sinking more than 160mA at low

impedances. The high current output driver has been designed to

deal with transmission line effects of high speed switching systems

with fast rising and falling edges. The performance of the system

can be enhanced by matching impedance at the output for proper

termination. It exhibits closely matched propagation delays (tPLH and

tPHL) and symmetrical rise and fall times. The resulting optical

waveform has minimal duty cycle distortion (DCD). When used with

the external pre–bias and pre–charging circuits, the response can

be tailored to a specific LED to eliminate any overshoot and to

minimize the long fall response.

Additionally, this part can be used as the transmitter in a complete

fiber optic system when combined with any of the

NE5210/5211/5212 preamplifiers and NE5214/5217 postamplifiers

for the optical receiver. Please refer to applications note AN1121 in

the Philips Semiconductors Fiber Optic Communication Data Book

for more specific applications information.

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