Datasheet
SN65EPT21
www.ti.com
SLLS970 –NOVEMBER 2009
PECL DC CHARACTERISTICS
At V
CC
= 3.3 V, GND = 0.0 V (unless otherwise noted)
(1) (2)
T
A
= –40°C T
A
= 25°C T
A
= 85°C
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX
V
IH
High-level input voltage, 2075 2420 2075 2420 2075 2420 mV
single-ended
V
IL
Low-leveI input voltage, 1355 1675 1355 1675 1355 1675 mV
single-ended
V
BB
Output reference voltage 1910 2009 2160 1910 2034 2160 1910 2026 2160 mV
V
IHCM
High-level input voltage, See
(3)
1.2 3.3 1.2 3.3 1.2 3.3 V
R
common-mode range,
differential
I
IH
High-level input current 150 150 150 μA
I
IL
Low-level input current -150 -150 -150 μA
(1) The device will meet the specifications after thermal balance has been established when mounted in a socket or printed circuit board
with maintained transverse airflow greater than 500 lfpm. Electrical parameters are assured only over the declared operating
temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are
applied individually under normal operating conditions and not valid simultaneously.
(2) Input parameters vary 1:1 with V
CC
.
(3) V
IHCMR(min)
varies 1:1 with GND, V
IHCMR(max)
varies 1:1 with V
CC
. V
IHCMR
range is referenced to the most positive side of the differential
input signal
TTL DC CHARACTERISTICS
At V
CC
= 3.3 V, GND = 0.0, T
A
= –40°C to 85°C (unless otherwise noted)
(1)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
CCH
Power supply current Output is HIGH 5 9 20 mA
I
CCL
Power supply current Output is LOW 8 7.5 26 mA
V
OH
High-level output voltage I
OH
= –3.0 mA 2.4 3.05 V
V
OL
Low-level output voltage IOL = 24 mA 0.32 0.5 V
I
OS
Output short circuit current –180 –100 –80 mA
(1) The device will meet the specifications after thermal balance has been established when mounted in a socket or printed circuit board
with maintained transverse airflow greater than 500 lfpm. Electrical parameters are assured only over the declared operating
temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are
applied individually under normal operating conditions and not valid simultaneously.
AC CHARACTERISTICS
At V
CC
= 3.0 V to 3.6 V, GND = 0.0 V (unless otherwise noted)
(1) (2)
T
A
= –40°C T
A
= 25°C T
A
= 85°C
PARAMETER TEST CONDITIONS UNIT
MIN TYP MAX MIN TYP MAX MIN TYP MAX
f
MAX
Maximum switching 300 300 300 MHz
frequency
(Figure 1–Figure 3)
t
PLH
Propagation delay At 1.5 V 1000 1394 1800 1000 1444 1800 1000 1481 1800 ps
t
PHL
Propagation delay At 1.5 V 1000 1140 1900 1000 1280 1900 1000 1421 1900 ps
t
JITTER
Random clock jitter (RMS) 2.25 5 3.2 5 3.4 5 ps
t
SKEW
Duty Cycle Skew
(3)
94 250 78 250 62 250 ps
t
SKPP
Part-to-Part Skew
(3)
500 500 500 ps
V
PP
Input swing See
(4)
150 1200 150 1200 150 1200 mV
t
r
/t
f
Output rise/fall times Q, Q (0.8V - 2.0V)) 250 500 900 250 500 900 250 500 900 ps
(1) The device will meet the specifications after thermal equilibrium has been established when mounted in a test socket or printed circuit
board with maintained transverse airflow greater than 500 lfpm. Electrical parameters are assured only over the declared operating
temperature range. Functional operation of the device exceeding these conditions is not implied. Device specification limit values are
applied individually under normal operating conditions and not valid simultaneously.
(2) R
L
= 500 Ω to GND and C
L
= 20 pF to GND. See Figure 4. Measured with 750mV, 50% duty cycle clock source
(3) Skews are measured between outputs under identical transitions
(4) V
PP(min)
is minimum input swing for which ac parameters are assured.
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