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June 2008 Rev 8 1/15

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

= 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

and ground.

DIP-16 SO-16

TSSOP16

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

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Summary of content (15 pages)

PAGE 1
ST26C31B CMOS quad 3-state differential line driver Features ■ TTL input compatible ■ Typical propagation delay: 6 ns ■ Typical output skew: 0.
PAGE 2
Contents ST26C31B Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Revision history . . . . . . . . . . . . . . . .
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ST26C31B Pin configuration 1 Pin configuration Figure 1. Pin connections Table 2.
PAGE 4
Pin configuration Table 3.
PAGE 5
ST26C31B Maximum ratings 2 Maximum ratings Table 4. Absolute maximum ratings (1) (2) Symbol Parameter Value Unit -0.5 to 7 V -0.5 to (VCC + 0.5) V -0.5 to 7 V Clamp diode current ± 20 mA IOUT DC output current per pin ± 150 mA ICC DC VCC or gnd current ± 150 mA -65 to +150 °C VCC Supply voltage VIN DC input voltage VOUT IIK TSTG DC output voltage (high or low state) Storage temperature range 1.
PAGE 6
Electrical characteristics ST26C31B 3 Electrical characteristics Table 6. Electrical characteristics (VCC = 5 V ± 10 %, unless otherwise specified (1)) Value Symbol Parameter Test conditions Unit Min. VIH High level input voltage VIL Low level input voltage VOH High level output voltage VIN = VIH or VIL, IOUT = -20mA VOL Low level output voltage VIN = VIH or VIL, IOUT = +20mA VT Differential output voltage RL = 100 Ω 2.
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ST26C31B Table 7. Electrical characteristics Switching characteristics (VCC = 5 V ± 10 %, tr = tf ≤ 6 ns (1)) Value Symbol tPLH tPHL Parameter Test conditions Unit Min. Typ. Max. 2 6 11 ns Propagation delay input to output S1 Open (2) S1 Open 0.
PAGE 8
Package mechanical data 4 ST26C31B 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.
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ST26C31B Package mechanical data Plastic DIP-16 (0.25) mechanical data mm. inch. Dim. Min. a1 0.51 B 0.77 Typ. Max. Min. Typ. Max. 0.020 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 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 Z 3.3 0.130 1.27 0.
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Package mechanical data ST26C31B SO-16 mechanical data Dim. mm. Min. Typ. A a1 inch. Max. Min. Typ. 1.75 0.1 0.068 0.25 a2 Max. 0.004 0.010 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 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 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 S 0.62 0.024 8° (max.
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ST26C31B Package mechanical data TSSOP16 mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. Max. 1.2 A1 0.05 A2 0.8 b 0.047 0.15 0.002 0.004 0.006 1.05 0.031 0.039 0.041 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0079 D 4.9 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 1 e 0.65 BSC K 0° L 0.45 A 0.60 0.0256 BSC 8° 0° 0.75 0.018 8° 0.024 0.
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Package mechanical data ST26C31B Tape & reel SO-16 mechanical data mm. inch. Dim. Min. A Max. Min. 330 13.2 Typ. Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 12/15 Typ. 0.504 22.4 0.519 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 P 7.9 8.1 0.311 0.
PAGE 13
ST26C31B Package mechanical data Tape & reel TSSOP16 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 330 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Typ. 0.504 22.4 0.519 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 P 7.9 8.1 0.311 0.
PAGE 14
Revision history ST26C31B 5 Revision history Table 8. Document revision history Date Revision 02-May-2006 7 Order codes updated. 12-Jun-2008 8 Added: Table 1 on page 1.
PAGE 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.