ST ST26C31B User Manual
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
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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
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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
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