Philips Semiconductors
Product specification
Fiber optic dual LED/clock driver
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
PIN CONFIGURATION
NC 1
Q0
2
14 D0
13 E0
12 V
CC
11 V
CC
10 V
CC
9 D1
8
E1
GND 3
GND 4
GND 5
Q1 6
NC 7
SF00591
•
High speed serial data communication
•
Fiber optic data links
•
Local area and metropolitan area networks
•
Digital Television
•
PBX systems
ASSOCIATED PRODUCTS
LOGIC DIAGRAM (ONE DRIVER)
V
CC
14
D0
TTL
input
buffer
Linearizing
circuit
Output
driver
amp
2
Q0
•
NE5210/11/12 transimpedance amplifiers
•
NE5214/5217 postamplifiers with link status indicator
•
74F5300 fiber optic LED driver
TYPE
TYPICAL
PROPAGATION
DELAY
2.5ns
TYPICAL SUPPLY
CURRENT( TOTAL)
8mA
E0
13
GND
V
CC
= Pin 10, 11, 12
GND = Pin 3, 4, 5
SF00592
74F5302
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.
ORDERING INFORMATION
ORDER CODE
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V
±
10%,
T
amb
= 0°C to +70°C
N74F5302N
N74F5302D
PKG DWG #
14–pin plastic DIP
14–pin plastic SO
SOT27-1
SOT108-1
INPUT AND OUTPUT LOADING
AND FAN OUT TABLE
PINS
Dn
En
DESCRIPTION
Data inputs
Enable inputs
74F (U.L.)
HIGH/LOW
1.0/1.0
1.0/1.0
LOAD VALUE
HIGH/LOW
20µA/0.6mA
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.
July 24, 1990
2
853-1410 00037
Philips Semiconductors
Product specification
Fiber optic dual LED/clock driver
74F5302
APPLICATION FOR 50Mb/s OPTICAL TRANSMITTER
+5V
0.1
µF
10
µF
11
12
+5V
120pF
D0
14
90
Ω
TTL
input
buffer
Linearizing
circuit
Output
driver
amp
2
14
Ω
4
Ω
10
µF
E0
13
LED
74F5302 (one driver)
3
4
5
SF00593
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL
V
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage
Input voltage
Input current
Voltage applied to output in high output state
Current applied to output in low output state
Operating free air temperature range
Storage temperature range
PARAMETER
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to V
CC
240
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
°
C
°
C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
MIN
V
CC
V
IH
V
IL
I
Ik
I
OH
I
OL
T
amb
Supply voltage
High–level input voltage
Low–level input voltage
Input clamp current
High–level output current
Low–level output current
Operating free air temperature range
0
4.5
2.0
0.8
–18
–160
160
+70
LIMITS
NOM
5.0
MAX
5.5
T
A
= –40 to +85
°
C
UNIT
V
V
V
mA
mA
mA
°
C
July 24, 1990
3
Philips Semiconductors
Product specification
Fiber optic dual LED/clock driver
74F5302
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN
V
CC
= MIN,
V
OH
High-level output voltage
V
IL
= MAX,
V
IH
= MIN
I
OH
= –160mA
V
CC
= MIN,
V
OL
Low-level output voltage
V
IL
= MAX,
V
IH
= MIN
V
IK
I
I
I
IH
I
IL
I
CC
Input clamp voltage
Input current at maximum input voltage
High–level input current
Low–level input current
Supply current (total)
I
CCH
V
CC
= MIN, I
I
= I
IK
V
CC
= MAX, V
I
= 7.0V
V
CC
= MAX, V
I
= 2.7V
V
CC
= MAX, V
I
= 0.5V
V
CC
= MAX
5.0
I
OL
= 100mA
I
OL
= 120mA
I
OL
= 160mA
I
OH
= –80mA
LIMITS
TYP
2
MAX
V
3.3
3.3
3.9
3.6
V
V
V
0.42
0.45
0.55
-0.73
0.55
0.60
0.80
-1.2
100
20
-0.6
12
V
V
V
V
µA
µA
mA
mA
UNIT
±
10%V
CC
±
5%V
CC
V
CC
= 5V
2.5
2.8
3.0
2.0
±
10%V
CC
±
10%V
CC
±
10%V
CC
±
10%V
CC
I
CCL
V
CC
= MAX
18
25
mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25°C.
3. The device is not short circuit protected.
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
amb
= +25
°
C
SYMBOL
PARAMETER
TEST CONDITION
MIN
t
PLH
t
PHL
D
tpw
t
RFS
t
sk (0)
t
THL
t
TLH
Propagation delay
Dn, En
,
to Qn
Pulse width distortion
1
Rise and fall time skew
3, 4
Output skew
2, 4
Fall time 90% to 10%
Rise time 10% to 90%
Waveform 2
Test circuits and
Waveforms
1.0
1.0
Waveform 1
Frequency = 10MHz
1.0
1.0
C
L
= 50pF, R
L
= 100
Ω
TYP
2.0
2.5
0.8
0.3
0.9
1.5
1.8
MAX
4.5
5.0
1.2
1.5
1.3
3.0
3.0
0.5
0.5
V
CC
= +5.0V
T
amb
= 0
°
C to +70
°
C
C
L
= 50pF, R
L
= 100
Ω
MIN
1.0
1.0
MAX
4.5
5.0
1.8
2.0
1.6
4.0
4.5
ns
ns
ns
ns
ns
V
CC
= +5.0V
±
10%
UNIT
NOTES:
1. D
tpw
is defined as the difference between input pulse width and output pulse width (0 to 3 volt swing and 50% duty cycle).
2. | t
PN
actual – t
PM
actual| for any output compared to any other output where N and M are either LH or HL.
3. | t
TLH
actual – t
THL
actual|.
4. Skew times are valid only under same test conditions (temperature, V
CC
, loading, etc.,).
AC WAVEFORMS
Dn, En
V
M
t
PLH
V
M
t
PHL
Qn
V
M
t
sk (0)
Qn
V
M
V
M
Qn
V
M
SF00594
SF00595
Waveform 1. Propagation delay for input to output
NOTE:
For all waveforms, V
M
= 1.5V.
July 24, 1990
4
Waveform 2. Output skew
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