ST26C31B
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
CC
= 0 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.
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
CC
and ground.
DIP-16
TSSOP16
SO-16
Table 1.
Device summary
Order codes Temperature range
ST26C31BN
ST26C31BDR
ST26C31BTR
-40 to 85 °C
-40 to 85 °C
-40 to 85 °C
Package
DIP-16
SO-16 (tape and reel)
TSSOP16 (tape and reel)
Packaging
25 parts per tube / 40 tube per box
2500 parts per reel
2500 parts per reel
June 2008 Rev 8 1/15 www.st.com
15
3
4
1
2
5
Contents
Contents
ST26C31B
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
ST26C31B
configuration
Figure 1.
Pin connections
Pin configuration
12
13
14
15
16
10
11
8
9
6
7
4
5
1
2
3
Table 2.
Pin n°
Pin description
Symbol
C
IN
C
OUT
C
OUT
EN
D
OUT
D
OUT
D
IN
V
CC
A
IN
A
OUT
A
OUT
EN
B
OUT
B
OUT
B
IN
GND
Input A
Channel A output
Channel A output
ENABLE
Channel B output
Channel B output
Input B
Ground
Input C
Channel C output
Channel C output
ENABLE
Channel D output
Channel D output
Input D
Supply voltage
Name and function
3/15
Pin configuration
Table 3.
Enable
Truth table
L
Enable
H
All other combinations of enable inputs
Note: L = Low voltage state
H = High logic state
X = Don’t care
Z = High impedance
Input
X
L
H
Output
Z
L
H
ST26C31B
Output
Z
H
L
4/15
ST26C31B Maximum ratings
Table 4.
Symbol
Supply voltage
DC input voltage
DC output voltage (high or low state)
DC output voltage (V
CC
= 0 V or high impedance)
Operating temperature range
Maximum enable input rise or fall times
Value Unit
V
CC
V
IN
V
OUT
I
IK
I
OUT
I
CC
T
STG
Supply voltage
DC input voltage
DC output voltage (high or low state)
Clamp diode current
DC output current per pin
DC V
CC
or gnd current
Storage temperature range
-0.5 to 7
-0.5 to (V
CC
+ 0.5)
-0.5 to 7
± 20
± 150
± 150
-65 to +150
V
V
V mA mA mA
°C
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.
Table 5.
Symbol
Recommended operating conditions
Parameter Value Unit
V
CC
V
IN
V
OUT
V
OUT
T
A t r
, t f
Absolute maximum ratings
(1) (2)
Parameter
4.5 to 5.5
0 to V
CC
0 to V
CC
0 to 5
-40 to +85
500
V
°C ns
V
V
V
5/15
Electrical characteristics ST26C31B
Table 6.
Symbol
Electrical characteristics (V
CC
= 5 V ± 10 %, unless otherwise specified (1)
)
Value
Parameter Test conditions
Min.
Typ.
Max.
Unit
V
V
V
V
V
V
T
V
IH
IL
OH
OL
T
-V
OS
T
High level input voltage
Low level input voltage
High level output voltage V
IN
= V
IH or V
IL
, I
OUT
= -20mA
Low level output voltage V
IN
= V
IH or V
IL
, I
OUT
= +20mA
Differential output voltage R
L
= 100 Ω (2)
Difference in differential output voltage
R
L
= 100 Ω (2)
Common mode output voltage
R
L
= 100 Ω (2)
2
2.5
2
3.4
0.3
3.1
1.8
0.8
0.5
0.4
3
V
V
V
OS
V
I
I
I
I
OS
IN
CC
OZ
SC
Difference in common mode output voltage
R
L
= 100 Ω (2)
Input current
Quiescent supply current
(2)
3-state output leakage current
Output short circuit current
V
IN
= V
CC
, GND, V
IH or V
IL
I
OUT
= 0 µA
V
IN
= V
CC
or GND
V
IN
= 2.4 or 0.5 V
(3)
V
OUT
= V
CC
or GND
ENABLE = V
IL
ENABLE = V
IH
V
IN
(2)
= V
CC
or GND
(4)
-30
200
0.8
±0.5
0.4
±1
500
2
±5
-150
V
µA
µA mA
µA mA
I
OFF
Power off output leakage current
(2)
V
CC
= 0 V
V
OUT
= 6 V
V
OUT
= -0.25 V
100
-100
1.
Unless otherwise specified, min./max. limits apply across the recommended operating temperature range. All typical are given for V
CC
= 5 V and T
A
= 25 °C
2.
See EIA Specification RS422 for exact test conditions.
3.
Measured per pin input. All other input at V
CC
or GND.
4.
This is the current sourced when a high output is shorted to ground. Only one output at time should be shorted.
µA
µA
V
V
V
V
V
6/15
ST26C31B Electrical characteristics
Table 7.
Switching characteristics (V
CC
= 5 V ± 10 %, t r
= t f
≤ 6 ns (1)
)
Value
Symbol Parameter Test conditions Unit
Min.
Typ.
Max.
t
PLH t
PHL
Skew
Propagation delay input to output
(2)
S1 Open
S1 Open
2 6
0.5
11
2 ns ns t
TLH t
THL t
PZH t
PZL t
PHZ t
PLZ
C
PD
C
IN
Differential output rise and fall times
Output enable time
Output enable time
Output disable time
(3)
Output disable time
(3)
Power dissipation capacitance
(4)
Input capacitance
S1 Open
S1 Closed
S1 Closed
S1 Closed
S1 Closed
6
11
13
5
7
50
6
10
19
21
9
11 ns ns ns ns ns pF pF
1.
Unless otherwise specified, min./max. limits apply across the recommended operating temperature range. All typical are given for V
CC
= 5 V and T
A
= 25 °C
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
D consumption, P
D
= C
PD
V
CC f + I
CC .
= C
PD
V
CC
2
, f = I
CC
V
CC
, and the no load dynamic current
7/15
Package mechanical data
4 Package mechanical data
ST26C31B
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
Dim.
I
L
Z e e3
F a1
B
D
E b b1
ST26C31B Package mechanical data
Min.
0.51
0.77
Plastic DIP-16 (0.25) mechanical data
mm.
Typ.
Max.
1.65
Min.
0.020
0.030
inch.
Typ.
0.5
0.25
0.020
0.010
20
8.5
2.54
17.78
0.335
0.100
0.700
7.1
5.1
3.3
0.130
1.27
Max.
0.065
0.787
0.280
0.201
0.050
P001C
9/15
Package mechanical data
Dim.
E e e3
C c1
D
A a1 a2 b b1
M
S
F
G
L
Min.
0.1
0.35
0.19
9.8
5.8
3.8
4.6
0.5
SO-16 mechanical data
mm.
Typ.
Max.
1.75
0.25
1.64
0.46
0.25
Min.
0.004
0.013
0.007
0.5
10
6.2
45° (typ.)
0.385
0.228
1.27
8.89
4.0
5.3
1.27
0.62
8° (max.)
0.149
0.181
0.019
ST26C31B inch.
Typ.
0.019
0.050
0.350
0.393
0.244
0.157
0.208
0.050
0.024
Max.
0.068
0.010
0.063
0.018
0.010
10/15
0016020D
Dim.
E
E1 c
D
A
A1
A2 b e
K
L
ST26C31B Package mechanical data
0.05
0.8
0.19
0.09
4.9
6.2
4.3
Min.
0°
0.45
TSSOP16 mechanical data
mm.
Typ.
Min.
1
5
6.4
4.4
0.65 BSC
Max.
1.2
0.15
1.05
0.30
0.20
5.1
6.6
4.48
0.002
0.031
0.007
0.004
0.193
0.244
0.169
0.60
8°
0.75
0°
0.018
inch.
Typ.
0.004
0.039
0.197
0.252
0.173
0.0256 BSC
Max.
0.047
0.006
0.041
0.012
0.0079
0.201
0.260
0.176
0.024
8°
0.030
A A2
A1 b e
D c
K
L
E
E1
PIN 1 IDENTIFICATION
1
0080338D
11/15
Package mechanical data
Tape & reel SO-16 mechanical data
Min.
mm.
Typ.
Min.
Dim.
Ao
Bo
Ko
Po
P
D
N
T
A
C 12.8
20.2
60
6.45
10.3
2.1
3.9
7.9
Max.
330
13.2
22.4
6.65
10.5
2.3
4.1
8.1
0.504
0.795
2.362
0.254
0.406
0.082
0.153
0.311
inch.
Typ.
ST26C31B
Max.
12.992
0.519
0.882
0.262
0.414
0.090
0.161
0.319
12/15
Dim.
Ao
Bo
Ko
Po
P
D
N
T
A
C
ST26C31B Package mechanical data
6.7
5.3
1.6
3.9
7.9
Min.
12.8
20.2
60
Tape & reel TSSOP16 mechanical data
mm.
Typ.
Min.
Max.
330
13.2
0.504
0.795
2.362
inch.
Typ.
22.4
6.9
5.5
1.8
4.1
8.1
0.264
0.209
0.063
0.153
0.311
Max.
12.992
0.519
0.882
0.272
0.217
0.071
0.161
0.319
13/15
Revision history
5 Revision
Table 8.
Date
Document revision history
Revision
02-May-2006
12-Jun-2008
7
8
Order codes updated.
Added: Table 1 on page 1
.
Changes
ST26C31B
14/15
ST26C31B
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2008 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
15/15
