74F5302 Datasheet, PDF (2/10 Pages) NXP Semiconductors – Fiber optic dual LED/clock driver

Philips Semiconductors
Fiber optic dual LED/clock driver
Product specification
74F5302
FEATURES
• TTL inputs
• Output enable control
• High current source and sink capability
• Matched propagation delay times (t_PLH, t_PHL)
• 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
74F5302
TYPICAL
PROPAGATION
DELAY
2.5ns
TYPICAL SUPPLY
CURRENT( TOTAL)
8mA
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
14–pin plastic DIP
COMMERCIAL RANGE
V_CC = 5V ±10%,
T_amb = 0°C to +70°C
N74F5302N
14–pin plastic SO
N74F5302D
PKG DWG #
SOT27-1
SOT108-1
INPUT AND OUTPUT LOADING
AND FAN OUT TABLE
PINS
DESCRIPTION
74F (U.L.) LOAD VALUE
HIGH/LOW HIGH/LOW
Dn Data inputs
1.0/1.0
20µA/0.6mA
En Enable inputs
1.0/1.0
20µA/0.6mA
Qn Current driver output 8000/266.6 160mA/160mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the high
state and 0.6mA in the low state.
PIN CONFIGURATION
NC 1
Q0 2
GND 3
GND 4
GND 5
Q1 ₆
NC 7
14 D0
13 _E0
12 VCC
11 V_CC
10 V_CC
9 D1
8 E1
SF00591
LOGIC DIAGRAM (ONE DRIVER)
V_CC
14
D0
TTL
input
buffer
13
E0
V_CC = Pin 10, 11, 12
GND = Pin 3, 4, 5
Linearizing
circuit
Output
driver
amp
2
Q0
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 t_PLH and t_PHL, 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 (t_PLH and
t_PHL) 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.
July 24, 1990
2
853-1410 00037