ST34C87 ...the analog plus QUAD RS-422 CMOS Differential Line Driver company TM June 1997-3 FEATURES Pin-to-Pin Compatible with National DS34C87 Meets the EIA RS-422 Requirements Low Power CMOS Design Low Propagation Delays Three-State Outputs with Enable Pin High Speed GENERAL DESCRIPTION The ST34C87 is a CMOS quad differential line driver designed to meet the standard RS-422 requirements and digital data transmission over balanced lines. To improve noise margin and output stability for slow changing input signals, special hysteresis is built in the ST34C87 circuit. The ST34C87 is a high speed CMOS line driver designed to operate with MFM / RLL controllers and hard disk drives as well as RS-422 digital data transmission applications. ST34C87 is suitable for low power 5V operation with high input voltage protection devices. ORDERING INFORMATION Part No. Package Operating Temperature Range ST34C87CP16 16 Lead 300 Mil PDIP 0°C to +70°C ST34C87CF16 16 Lead 150 Mil JEDEC SOIC 0°C to +70°C ST34C87IP16 16 Lead 300 Mil PDIP -40°C to +85°C ST34C87IF16 16 Lead 150 Mil JEDEC SOIC -40°C to +85°C INPUT D INPUT A OUTPUTA+ OUTPUT D+ OUTPUT A- OUTPUT D- ENABLE A/B ENABLE C/D OUTPUTB- OUTPUT C- OUTPUTB+ OUTPUT C+ INPUT B INPUT C Figure 1. Block Diagram Rev. 1.01 1991 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017 1 ST34C87 PIN CONFIGURATION INPUT A OUTPUT A+ OUTPUT AENABLE A/B OUTPUT BOUTPUT B+ INPUT B GND 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 INPUT A OUTPUT A+ OUTPUT AENABLE A/B OUTPUT BOUTPUT B+ INPUT B GND VCC INPUT D OUTPUT D+ OUTPUT DENABLE C/D OUTPUT COUTPUT C+ INPUT C 16 Lead PDIP (0.300”) 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC INPUT D OUTPUT D+ OUTPUT DENABLE C/D OUTPUT COUTPUT C+ INPUT C 16 Lead SOIC (Jedec, 0.150”) PIN DESCRIPTION Pin # Symbol Type Description 1 INPUT A I Driver A input pin. 2 OUTPUT A+ O Driver A differential non-inverting output pin. 3 OUTPUT A- O Driver A differential inverting output pin. 4 ENABLE A/B I Gate control (active high). This pin is one of the two control pins which enables or disables all four drivers. All four drivers are gated with two input or gate. 5 OUTPUT B- O Driver B differential inverting output pin. 6 OUTPUT B+ O Driver B differential non-inverting output pin. 7 INPUT B I Driver B input pin. 8 GND O Signal and power ground. 9 INPUT C I Driver C input pin. 10 OUTPUT C+ O Driver C differential non-inverting output pin. 11 OUTPUT C- O Driver C differential inverting output pin. 12 ENABLE C/D I Gate control (active low). See ENABLE A/B pin description. 13 OUTPUT D- O Driver D differential inverting output pin. 14 OUTPUT D+ O Driver D differential non-inverting output pin. 15 INPUT D I Driver D input pin. 16 VCC I Power supply pin. Rev. 1.01 2 ST34C87 AC ELECTRICAL CHARACTERISTICS Test Conditions: -40°C - +85°C, VCC = 5.0V + 10% unless otherwise specified. Symbol Parameter Min. Typ. Max. Unit Conditions T1 Propagation Delay, Input to Output 8 10 ns S1 open T2 Differential Output Rise and Fall Time 8 10 ns S1 open T3 Output Enable Time 18 20 ns S1 close T4 Output Disable Time 18 20 ns S1 close 2 ns S1 open T5 Note: 1 Skew 1 Skew is defined as the difference in propagation delays between complementary outputs at the 50% point. DC ELECTRICAL CHARACTERISTICS Test Conditions: TA = -40°C - +85°C, VCC = 5.0V + 10% unless otherwise specified. Symbol Parameter Min. Typ. Max. Unit +1.0 A IIN Input Current ICC Operating Current 600 A IOZ Three-State Output Leakage +2.0 A VIH Input High Level VIL Input Low Level VOH Output High Level VOL Output Low Level 2.0 V 0.8 2.5 VOS Differential Output Level VOC Common Mode Output Voltage 2.0 3.0 VOD Difference in Common Mode Output 0.4 CIN Input Capacitance Power Dissipation Capacitance IOS Output Short Current IOFF Output Leakage Current Power Off IDC 7 V V 0.5 CPD Conditions 10 15 100 -200 Output Current V V RL=100 V RL=100 RL=100 pF pF -30 mA VIN=VCC or GND 100 A VOUT=6V -100 A VOUT=0.25V +150 mA Specifications are subject to change without notice Rev. 1.01 3 ST34C87 ABSOLUTE MAXIMUM RATINGS Storage Temperature . . . . . . . . . . . . -60°C to +160°C Package Dissipation . . . . . . . . . . . . . . . . . . . . . 500mW Supply Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Voltage at Any Pin . . . . . . . . GND-0.3V to VCC + 0.3V Operating Temperature . . . . . . . . . . . –40°C to +85°C Enable A/B C/D Output Differential Non-Inverting Output Differential Inverting Output L X Z Z H L L H H H H L X = Don’t care Z = Three-State (high impedance) Table 1. Functional Table VCC U1 ENABLE R1 50 C2 40pF Input C1 40pF Driver R2 50 C3 40pF R3 500 Figure 2. Test Condition Rev. 1.01 4 S1 ST34C87 ENABLE ENABLE* INPUT X T4 T3 T1 T1 T1 T1 OUTPUT X+ T3 OUTPUT X- T4 90% 90% 10% 10% T2 OUTPUT X+ T2 50% T5 OUTPUT X- 50% Figure 4. Differential Line Driver Timing Rev. 1.01 5 ST34C87 16 LEAD PLASTIC DUAL-IN-LINE (300 MIL PDIP) Rev. 1.00 16 9 1 8 E1 E D A2 Seating Plane A L α A1 B MILLIMETERS INCHES SYMBOL eA eB B1 e MIN MAX MIN MAX A 0.145 0.210 3.68 5.33 A1 0.015 0.070 0.38 1.78 A2 0.115 0.195 2.92 4.95 B 0.014 0.024 0.36 0.56 B1 0.030 0.070 0.76 1.78 C 0.008 0.014 0.20 0.38 D 0.745 0.840 18.92 21.34 E 0.300 0.325 7.62 8.26 E1 0.240 0.280 6.10 7.11 e eA 0.100 BSC 2.54 BSC 0.300 BSC 7.62 BSC eB 0.310 0.430 7.87 10.92 L 0.115 0.160 2.92 4.06 α 0° 15° 0° 15° Note: The control dimension is the inch column Rev. 1.01 6 C ST34C87 16 LEAD SMALL OUTLINE (150 MIL JEDEC SOIC) Rev. 1.00 D 16 9 1 E H 8 C A Seating Plane e B α A1 L INCHES SYMBOL MILLIMETERS MIN MAX MIN A 0.053 0.069 1.35 1.75 A1 0.004 0.010 0.10 0.25 B 0.013 0.020 0.33 0.51 C 0.007 0.010 0.19 0.25 D 0.386 0.394 9.80 10.00 E 0.150 0.157 3.80 4.00 e 0.050 BSC MAX 1.27 BSC H 0.228 0.244 5.80 6.20 L 0.016 0.050 0.40 1.27 α 0° 8° 0° 8° Note: The control dimension is the millimeter column Rev. 1.01 7 ST34C87 NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 1997 EXAR Corporation Datasheet June 1997 Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Rev. 1.01 8