CMOS quad 3-state differential line driver
Features
■ TTL input compatible
■ Typical propagation delay: 6 ns
■ Typical output skew: 0.5 ns
■ Output will not load line when V
■ Meets the requirements of EIA standard
RS-422
■ Operation from single 5 V supply
■ 3-state outputs for connection to system buses
■ Low quiescent current
■ Available in surface mount
Description
The ST26C31B is a quad differential line driver
designed for digital data transmission over
balanced lines and meets all the requirements of
EIA standard RS-422 while retaining the low
power characteristics of CMOS.
CC
= 0 V
ST26C31B
DIP-16 SO-16
TSSOP16
The ST26C31B accepts TTL or CMOS input
levels and translates these to RS-422 output
levels. This part uses special outputs circuitry
common to all four drivers. All outputs are
protected against damage due to electrostatic
discharge by diode to V
and ground.
CC
Table 1. Device summary
Order codes Temperature range Package Packaging
ST26C31BN -40 to 85 °C DIP-16 25 parts per tube / 40 tube per box
ST26C31BDR -40 to 85 °C SO-16 (tape and reel) 2500 parts per reel
ST26C31BTR -40 to 85 °C TSSOP16 (tape and reel) 2500 parts per reel
June 2008 Rev 8 1/15
www.st.com
15
Contents ST26C31B
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
ST26C31B Pin configuration
1 Pin configuration
Figure 1. Pin connections
Table 2. Pin description
Pin n° Symbol Name and function
1A
2A
3A
IN
OUT
OUT
Input A
Channel A output
Channel A output
4 EN ENABLE
5B
6B
7B
OUT
OUT
IN
Channel B output
Channel B output
Input B
8 GND Ground
9C
10 C
11 C
IN
OUT
OUT
Input C
Channel C output
Channel C output
12 EN ENABLE
13 D
14 D
15 D
16 V
OUT
OUT
IN
CC
Channel D output
Channel D output
Input D
Supply voltage
3/15
Pin configuration ST26C31B
Table 3. Truth table
Enable Enable Input Output Output
LHXZZ
All other combinations of enable inputs
LLH
HHL
Note: L = Low voltage state
H = High logic state
X = Don’t care
Z = High impedance
4/15
ST26C31B Maximum ratings
2 Maximum ratings
Table 4. Absolute maximum ratings
(1) (2)
Symbol Parameter Value Unit
V
V
V
OUT
I
I
OUT
I
CC
T
STG
1. Absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. They are not
meant to imply that the device should be operated at these limits. The table of electrical characteristics provide conditions
for actual device operation.
2. Unless otherwise specified, all voltage are referenced to ground. All currents into the device pins are positive; all currents
out of the device pins are negative.
Supply voltage -0.5 to 7 V
CC
DC input voltage -0.5 to (VCC + 0.5) V
IN
DC output voltage (high or low state) -0.5 to 7 V
Clamp diode current ± 20 mA
IK
DC output current per pin ± 150 mA
DC VCC or gnd current ± 150 mA
Storage temperature range -65 to +150 °C
Table 5. Recommended operating conditions
Symbol Parameter Value Unit
V
V
V
V
OUT
OUT
T
t
r
Supply voltage 4.5 to 5.5 V
CC
DC input voltage 0 to V
IN
DC output voltage (high or low state) 0 to V
CC
CC
DC output voltage (VCC = 0 V or high impedance) 0 to 5 V
Operating temperature range -40 to +85 °C
A
, t
Maximum enable input rise or fall times 500 ns
f
V
V
5/15
Electrical characteristics ST26C31B
3 Electrical characteristics
Table 6. Electrical characteristics (V
= 5 V ± 10 %, unless otherwise specified
CC
Symbol Parameter Test conditions
V
V
V
V
V
VT-V
V
VOS-
V
I
I
CC
I
OZ
I
SC
High level input voltage 2 V
IH
Low level input voltage 0.8 V
IL
High level output voltage VIN = V
OH
Low level output voltage VIN = V
OL
Differential output voltage RL = 100 Ω
T
Difference in differential
T
output voltage
Common mode output
OS
voltage
Difference in common
mode output voltage
OS
Input current VIN = VCC, GND, V
IN
Quiescent supply current
(2)
3-state output leakage
current
Output short circuit
current
R
L
R
L
R
L
I
OUT
V
OUT
ENABLE = V
VIN = VCC or GND
(2) (4)
or VIL, I
IH
or VIL, I
IH
(2)
= 100 Ω
= 100 Ω
= 100 Ω
(2)
(2)
(2)
= 0 µA
= VCC or GND
= -20mA 2.5 3.4 V
OUT
= +20mA 0.3 0.5 V
OUT
or V
IH
VIN = VCC or GND 200 500 µA
= 2.4 or 0.5 V
V
IN
ENABLE = V
IL
(1)
)
Val ue
Unit
Min. Typ. Max.
23.1 V
0.4 V
1.8 3 V
0.4 V
IL
(3)
IH
0.8 2 mA
±0.5 ±5 µA
±1 µA
-30 -150 mA
V
= 6 V 100 µA
I
OFF
1. Unless otherwise specified, min./max. limits apply across the recommended operating temperature range. All typical are
given for VCC = 5 V and TA = 25 °C
2. See EIA Specification RS422 for exact test conditions.
3. Measured per pin input. All other input at VCC or GND.
4. This is the current sourced when a high output is shorted to ground. Only one output at time should be shorted.
Power off output leakage
current
(2)
VCC = 0 V
OUT
= -0.25 V -100 µA
V
OUT
6/15
ST26C31B Electrical characteristics
Table 7. Switching characteristics (VCC = 5 V ± 10 %, tr = tf ≤ 6 ns
(1)
)
Val ue
Symbol Parameter Test conditions
Unit
Min. Typ. Max.
t
PLH
t
PHL
Skew
t
TLH
t
THL
t
PZH
t
PZL
t
PHZ
t
PLZ
C
C
1. Unless otherwise specified, min./max. limits apply across the recommended operating temperature range. All typical are
given for V
2. Skew is defined as the difference in propagation delays between complementary outputs at the 50 % point.
3. Output disable time is the delay from the control input being switched to the output transistors tuning off. The actual disable
times are less than indicated due to the delay added by RC time constant of the load.
4. CPD determines the no load dynamic power consumption, P
consumption, PD = CPD VCCf + I
Propagation delay input to output S1 Open 2 6 11 ns
(2)
S1 Open 0.5 2 ns
Differential output rise and fall times S1 Open 6 10 ns
Output enable time S1 Closed 11 19 ns
Output enable time S1 Closed 13 21 ns
Output disable time
Output disable time
Power dissipation capacitance
PD
Input capacitance 6 pF
IN
= 5 V and TA = 25 °C
CC
(3)
(3)
CC .
(4)
S1 Closed 5 9 ns
S1 Closed 7 11 ns
50 pF
= CPDV
D
f = ICCVCC, and the no load dynamic current
CC2,
7/15
Package mechanical data ST26C31B
4 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com
8/15
ST26C31B Package mechanical data
Plastic DIP-16 (0.25) mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
a1 0.51 0.020
B 0.77 1.65 0.030 0.065
b 0.5 0.020
b1 0.25 0.010
D200.787
E 8.5 0.335
e 2.54 0.100
e3 17.78 0.700
F 7.1 0.280
I 5.1 0.201
L 3.3 0.130
Z 1.27 0.050
P001C
9/15
Package mechanical data ST26C31B
SO-16 mechanical data
Dim.
Min. Typ. Max. Min. Typ. Max.
mm. inch.
A 1.75 0.068
a1 0.1 0.25 0.004 0.010
a2 1.64 0.063
b 0.35 0.46 0.013 0.018
b1 0.19 0.25 0.007 0.010
C 0.5 0.019
c1 45° (typ.)
D 9.8 10 0.3850.393
E5.8 6.2 0.228 0.244
e 1.27 0.050
e38.89 0.350
F 3.8 4.0 0.149 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.019 0.050
M 0.62 0.024
S8° (max.)
10/15
0016020D
ST26C31B Package mechanical data
TSSOP16 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c0.09 0.20 0.004 0.0079
D4.9 5 5.1 0.193 0.197 0.201
E 6.2 6.4 6.6 0.244 0.252 0.260
E1 4.3 4.4 4.48 0.169 0.173 0.176
e 0.65 BSC 0.0256 BSC
K0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030
A2
A
A1
b
e
c
K
L
E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
11/15
Package mechanical data ST26C31B
Tape & reel SO-16 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 6.45 6.65 0.254 0.262
Bo 10.3 10.5 0.406 0.414
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161
P7.98.1 0.311 0.319
12/15
ST26C31B Package mechanical data
Tape & reel TSSOP16 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 6.7 6.9 0.264 0.272
Bo 5.3 5.5 0.209 0.217
Ko 1.6 1.8 0.063 0.071
Po 3.9 4.1 0.153 0.161
P7.98.1 0.311 0.319
13/15
Revision history ST26C31B
5 Revision history
Table 8. Document revision history
Date Revision Changes
02-May-2006 7 Order codes updated.
12-Jun-2008 8 Added: Table 1 on page 1.
14/15
ST26C31B
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