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CMOS quad 3-state differential line receiver
Features
■ CMOS design for low power
■ ± 0.2 V sensitivity over input common mode
voltage range
■ Typical propagation delay: 19 ns
■ Typical input hysteresis: 60 mV
■ Input will not load line when V
■ Meets the requirements of EIA standard
RS-422, RS-423
■ 3-state outputs for connection to system buses
■ Available in surface mount
Description
The ST26C32AB is a quad differential line
receiver designed to meet the RS-422, RS-423
standards for balanced and unbalanced digital
data transmission, while retaining the low power
characteristics of CMOS.
CC
= 0 V
ST26C32AB
DIP-16 SO-16
TSSOP16
The ST26C32AB has an input sensitivity of 200
mV over the common mode input voltage range of
± 7 V. The ST26C32AB features internal pull-up
and pull-down resistors which prevent output
oscillation on unused channels. The ST26C32AB
provides an enable and disable function to all four
receivers and features 3-state output with 6 mA
source and sink capability.
Table 1. Device summary
Order codes Temperature range Package Packaging
ST26C32ABN -40 to 85 °C DIP-16 25 parts per tube / 40 tube per box
ST26C32ABDR -40 to 85 °C SO-16 (tape and reel) 2500 parts per reel
ST26C32ABTR -40 to 85 °C TSSOP16 (tape and reel) 2500 parts per reel
June 2008 Rev 4 1/14
www.st.com
14
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Contents ST26C32AB
Contents
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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ST26C32AB Pin configuration
1 Pin configuration
Figure 1. Pin connections
Table 2. Pin description
Pin n° Symbol Name and function
1A
2A
3A
IN1
IN2
OUT
Input A1
Input A2
Channel A Output
4 EN ENABLE
5B
6B
7B
OUT
IN2
IN1
Channel B Output
Input B2
Input B1
8 GND Ground
9C
10 C
11 C
IN1
IN2
OUT
Input C1
Input C2
Channel C output
12 EN ENABLE
13 D
14 D
15 D
16 V
OUT
IN2
IN1
CC
Channel D output
Input D2
Input D1
Supply voltage
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Pin configuration ST26C32AB
Table 3. Truth table
Enable Enable Input Output
LHXZ
All other combinations of enable inputs
≥ V
V
ID
TH(MAX)
V
≤ V
ID
TH(MIN)
H
L
Open H
Note: L = Low voltage state
H = High logic state
X = Don’t care
Z = High impedance
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ST26C32AB Maximum ratings
2 Maximum ratings
Table 4. Absolute maximum ratings
(1) (2)
Symbol Parameter Value Unit
V
V
V
DIFF
V
I
OMAX
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 7 V
CC
Input common mode range ± 14 V
CM
Differential input voltage ± 14 V
Enable input voltage 7 V
IN
Maximum current per output ± 25 mA
Storage temperature range -65 to +150 °C
Table 5. Recommended operating conditions
Symbol Parameter Value Unit
V
T
t
r
Supply voltage 4.5 to 5.5 V
CC
Operating temperature range -40 to +85 °C
A
, t
Maximum enable input rise or fall times 500 ns
f
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Electrical characteristics ST26C32AB
3 Electrical characteristics
Table 6. Electrical characteristics
(V
= 5 V ± 10 %, unless otherwise specified
CC
Symbol Parameter Test conditions
V
R
V
V
V
V
I
Minimum differential input
TH
voltage
Input resistance VIN = -7V, 7V, other input = GND 5 6.8 10 kΩ
IN
I
Input current
IN
High level output voltage V
OH
Low level output voltage V
OL
Minimum enable high input
IH
level voltage
Minimum enable low input
IL
level voltage
3-state output leakage current
OZ
Maximum enable input
I
I
current
= V
V
OUT
V
= 10V, other input = GND 1.1 1.5
IN
= -10V, other input = GND -2 -2.5
V
IN
DIFF
DIFF
V
OUT
ENABLE = V
V
= VCC or GND ±1 µA
IN
or VOL, -7V < VCM < 7V -200 35 200 mV
OH
= 1V, I
= -1V, I
= -6mA 3.8 4.2 V
OUT
= 6mA 0.2 0.3 V
OUT
= VCC or GND
, ENABLE = V
IL
(1)
)
Val ue
Unit
Min. Typ. Max.
mA
2V
0.8 V
IH
±0.5 ±5 µA
I
V
HYST
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
Table 7. Switching characteristics (VCC = 5 V ± 10 %,
Quiescent power supply
CC
current
Input hysteresis VCM = 0V 60 mV
V
CC
= Max, V
= 1V 16 23 mA
(DIFF)
(1)
)
Val ue
Symbol Parameter Test conditions
Min. Typ. Max.
t
PLH
t
PHL
t
RISE
t
FAL L
t
PZH
t
PZL
t
PHZ
t
PLZ
D
1. Unless otherwise specified, min./max. limits apply across the recommended operating temperature range. All typical are
given for V
Propagation delay input to
output
Output rise and fall times CL = 50pF, V
Propagation enable time
to output
Propagation disable time
to output
Data rate
R
= 5 V and TA = 25 °C
CC
= 50pF, V
C
L
= 50pF, V
C
L
= 50pF, V
C
L
= 50pF, V
C
L
= 2.5V, VCM = 0V 19 30 ns
DIFF
= 2.5V, VCM = 0V 4 9 ns
DIFF
= 2.5V, RL = 1000Ω 13 23 ns
DIFF
= 2.5V, RL = 1000Ω 13 22 ns
DIFF
= 2.5V
DIFF
All outputs loaded and switching
10 20 Mbits/s
Unit
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ST26C32AB Package mechanical data
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
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Package mechanical data ST26C32AB
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
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P001C
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ST26C32AB Package mechanical data
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.)
0016020D
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Package mechanical data ST26C32AB
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
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0080338D
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ST26C32AB Package mechanical data
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
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Package mechanical data ST26C32AB
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
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ST26C32AB Revision history
5 Revision history
Table 8. Document revision history
Date Revision Changes
02-May-2006 3 Order codes updated.
12-Jun-2008 4 Added: Table 1 on page 1.
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ST26C32AB
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