IL34C87
1
CMOS Quad TRISTATE Differential Line Driver.
General Description
The IL34C87T is a quad differential line driver
designed for digital data transmission over balanced
lines. The IL34C87T meets all the requirements of
EIA standard RS-422 while retaining the low power
characteristics of CMOS. This enables the
construction of serial and terminal interfaces while
maintaining minimal power consumption. The
IL34C87T accepts TTL or CMOS input levels and
translates these to RS-422 output levels. This part
uses special output circuitry that enables the
individual drivers to power down without loading
down the bus. This device has separate enable
circuitry for each pair of the four drivers. All inputs
are protected against damage due to electrostatic
discharge by diodes to V
CC
and ground.
Pinning
Pin Symbol Description
01
A
Input of driver A
02
A1 Output
03
A2 Inverted
output
04
En A/B
input of switching outputs
of A and B receivers into
the third state
05
B2
Inverted output B
06
B1
Output B
07
B
Input of driver B
08
GND General
pin
09
C
Input of driver C
10
C1
Output C
11
C2
Inverted output C
12
En C/D
input of switching outputs
of C and D receivers into
the third state
13
D2
Inverted output B
14
D1
Output B
15
D
Input of driver B
16
V
CC
Pin of power supply
Designation
Of microcircuit in package
IL34C86N Plastic DIP
IL34C86D SOIC
T
A
from minus 40 to plus 85
C
Pin configuration.
V
CC
A
A1
A2
En A/B
GND
D
D1
D2
En C/D
C2
C1
C
B2
B1
B
01
02
03
04
05
06
10
11
12
13
14
15
16
07
08
09
Features
TTL input compatible
Typical propagation delays: 6 ns
Typical output skew: 0.5 ns
Outputs won't load line when
V
CC
= 0V
Meets the requirements of EIA standard
RS-422
Operation from single 5V supply
TRI-STATE outputs for connection to
system buses
Low quiescent current
Available in surface mount
IL34C87
2
Truth Table
Input Control
Input
Non-Inverting
Output
Inverting
Output
H H
H
L
L H L
H
X L
Z
Z
L = Low logic state
H = High logic state
X = Irrelevant
Z = TRI-STATE (high performance)
Structure of microcircuit.
Input
Control
input
Output
Inverted
output
Table 1 - Limiting and extreme parameters
Parameter
Symbol
Operating condition
Maximum ratings
Units of
measureme
nt
min
max
min
max
Supply voltage
V
CC
4.50 5.50 -0.5 7 V
DC input voltage
V
IN
0 V
CC
-1.5 V
CC
+1.
5
DC output voltage
V
OUT
0 V
CC
-0.5 7
Protection diode current
V
DIFF
-- -- -20
+20
Voltage on input Enable
V
IN
-- -- --
7
Output current
--
--
--
-150
+150
mA
Input Rise or Fall Times
(tr, tf)
t
r
, t
f
-- 500 --
--
ns
Dissipated
power
DIP P
D
-- -- --
1736
*
mW
SO
--
--
--
1226
*
Operating Temperature
Range (TA)
T
A
-40 +85 -- --
Storage temperature
T
STG
-- -- -65
+150
Temperature of
soldering, 4s
T
L
-- -- --
260
*
- at increasing temperature higher than 25
C P
D
decreased on 13.89mW/
C for DIP package and on
9.80mW/
C for SO package.
IL34C87
3
Table 2 -Electric parameters
T= -40
0
+85
0
C
standard
parameter symbol
conditions
of
measurement
Min
Max
units of
measureme
nt
High level input voltage
V
IH
2.0 --
Low level input voltage
V
IL
-- 0.8
V
High level output voltage
V
OH
I
OUT
= -20mA
2.5
--
Low level output voltage
V
OL
I
OUT
= +48mA
--
0.5
V
Differential output voltage
V
T
R
L
= 100 Ohm
2.0
--
V
Difference in differential outputs
T
V
T
V
-
R
L
= 100 Ohm
--
0.4
V
Output voltage
V
OS
R
L
= 100 Ohm
--
3.0
V
Difference in common mode
output
OS
OS
V
V
-
R
L
= 100 Ohm
--
0.4
V
Input current
I
IN
V
IN
= V
CC
, 0V,
V
IH
or V
IL
--
1.0
mkA
I
OUT
= 0mkA,
V
IN
= V
CC
or 0V
-- 500 mkA
Consumption current
I
CC
I
OUT
= 0mkA,
V
IN
= 2.4 or 0.5V
-- 2.0
mA
Output current of the third
state
I
OZ
V
OUT
= V
CC
or 0V, V
CONTROL
= V
IL
--
5.0
mkA
Short circuit
output current
I
SC
V
IN
= V
CC
or 0V
-30 -150
mA
V
CC
= 0V, V
OUT
= 6V
--
100
Output current of the off state
I
OFF
V
CC
= 0V, V
OUT
= -0.25V
--
-100
mkA
Time of propagation delay at
switching off, switching on
t
PLH
, t
PHL
t
r
, t
f
6ns
-- 11
Asymmetric transition time
when switching in, switching
off
Skew
t
r
, t
f
6ns
-- 3
Transition time when switching
in, switching off
t
RISE
, t
FALL
t
r
, t
f
6ns
-- 10
time of the third state
propagation delay on input
Enable
t
PZH
t
r
, t
f
6ns
-- 25
time of the third state
propagation delay on input
Enable
t
PZL
t
r
, t
f
6ns
-- 26
time of the third state
propagation delay on input
Enable
t
PHZ
t
r
, t
f
6ns
-- 8
time of the third state
propagation delay on input
Enable
t
PLZ
t
r
, t
f
6ns
-- 12
ns
IL34C87
4
Figure 4 - Time diagram of signals at changing dynamic parameters
t
TLH
, t
THL
, t
PLH
, t
PHL
,
SKEW
.
1.3 V
0.0 V
3.0 V
Control Input
(Enable)
Output
Output
f = 1MHz,
t = t < 6 ns
r
f
T LZ
P
VOL
VOH
0.3 V
V +
OL
0.3 V
V -
OH
0.8 V
2.0 V
T HZ
P
T ZL
P
T ZH
P
.
0.0 V
3.0 V
Input
Output
(Differential)
t TLH
t THL
10 %
10 %
90 %
90 %
1.3 V
1.3 V
1.3 V
t PLH
t PLH
t PHL
0.0 V
3.0 V
Input
f = 1MHz,
t = t < 6 ns
r
f
Output
Output
t PHL
SKEW
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