ICs for Information Equipment AN8612NSB SCSI active terminator IC ■ Overview Unit: mm 12.63±0.20 (1.90) • Active termination for 18-signal line • Low power consumption due to its standby function (100 µA at standby). • Small output pin capacitance: 3.8 pF (typ.) • High precision regulator: 2.85 V±60 mV 19 18 13 1 6 7 12 (0.715) (3.20) 0.80 +0.10 0.30–0.05 +0.10 0.20 –0.05 2.00±0.20 (1.05) 0.10±0.10 ■ Features 24 5.50±0.20 7.60±0.30 The AN8612NSB is a terminator IC conformed to standard interface specification (SCSI-I/II) for personal computers, workstations and various types of information equipment. So far configured with a fixed resistor and a regulator, it has recently been integrated onto a single chip with built-in standby function. It is easy to satisfy 25 pF of the maximum pin capacitance in SCSI-II specification due to its small output pin capacitance. It can sapport 10 Mbyte/s of SCSI-II and 20 Mbyte/s of FAST-20. 0° to 10° 0.50±0.20 Seating plane HSOP030-P-0300 ■ Applications • SCSI interface board of PC • SCSI-compatible equipment such as CD-ROM, MO, PD, MD drive and printer 1 AN8612NSB ICs for Information Equipment ■ Block Diagram 24 12 TERMPWR 2.85 V 115 Ω 18 13 115 Ω 17 115 Ω 16 Thermal shut down 115 Ω 15 115 Ω 14 115 Ω 11 115 Ω 10 Band gap reference 115 Ω 115 Ω 115 Ω 115 Ω 115 Ω 115 Ω 115 Ω 9 8 7 5 4 3 2 115 Ω 23 115 Ω 22 115 Ω 21 115 Ω 20 GND GND 2 19 1 6 Standby REG out SG line1 SG line2 SG line3 SG line4 SG line5 SG line6 SG line7 SG line8 SG line9 SG line10 SG line11 SG line12 SG line13 SG line14 SG line15 SG line16 SG line17 SG line18 ICs for Information Equipment AN8612NSB ■ Pin Descriptions Pin No. Description Pin No. Description 13 VCC (TERMPWR) *3 SG line14 14 SG line5 3 SG line13 15 SG line4 4 SG line12 16 SG line3 5 SG line11 1 Standby 2 6 Fin *1 17 SG line2 GND *2 18 SG line1 GND *2 Fin GND *2 7 SG line10 19 GND *2 8 SG line9 20 SG line18 9 SG line8 21 SG line17 10 SG line7 22 SG line16 11 SG line6 23 SG line15 24 REG out 12 VCC (TERMPWR) *3 Note) *1: A standby pin input voltage becomes an active mode at VI < VTH and a standby mode at VI > VTH+ . Likewise, a standby mode when standby pin is open. *2: Both ground pins of the pin 6 and pin 19 should be placed on the same pattern, and the pattern should be wide on the PCB. (We recommend that whole surface of one layer of a multi-layer PCB be GND.) *3: Connect the VCC to SCSI termination resistor power supply (TERMPWR). ■ Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation *2 Operating ambient temperature Storage temperature *1 *1 Symbol Rating Unit VCC 6.0 V ICC 550 mA PD 412 mW Topr −20 to +75 °C Tstg −55 to +150 °C Note) *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for Ta = 25°C. *2: Ta = 75°C. For the independent IC without a heat sink. Refer to "■ Application Notes". ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 4.0 to 5.5 V 3 AN8612NSB ICs for Information Equipment ■ Electrical Characteristics at VCC = 5.0 V, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Supply current 1 ICC1 Standby = low, all SG line = open 44 54 mA Supply current 2 ICC2 Standby = low, All SG line = 0.2 V 458 530 mA Supply current 3 ICC3 Standby = open 100 200 µA −150 −50 µA 1 µA Standby pin low-level input current ISTBYL VCC = 5.5 V, VI = 0 V Standby pin high-level input current ISTBYH VCC = 5.5 V, VI = 5.5 V Standby pin positive direction threshold voltage VTH+ 1.3 1.5 1.7 V Standby pin negative direction threshold voltage VTH− 1.1 1.3 1.5 V 19.8 23.0 26.2 mA Maximum output current SG line1 to SG line18 ISG VSG = 0.2 V Output leak current 1 SG line1 to SG line18 ILK1 VCC = 5.5 V Standby = open, VSG = 0 V −1 µA Output leak current 2 SG line1 to SG line18 ILK2 VCC = 5.5 V, VSG = 2.85 V Standby = open −1 1 µA REG output voltage 1 VREG1 VCC = 4.0 V to 5.5 V, all SG line = open 2.79 2.85 2.91 V REG output voltage 2 VREG2 VCC = 3.2 V, all SG line = open 2.00 V Termination resistance value SG line1 to SG line18 RSG ISG = 5 mA to 15 mA 107 115 123 Ω High-level output voltage SG line1 to SG line18 VSGH VCC = 4.0 V to 5.5 V, all SG line = open 2.78 2.85 2.92 V • Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. Parameter Symbol Conditions Min Typ Max Unit Standby pin hysteresis width VHYS 200 mV Output pin capacitance CSG 3.8 4.5 pF Thermal shutdown temperature TTSD 170 °C ■ Terminal Equivalent Circuits Pin No. 1 Symbol Equivalent circuit Standby VCC 100 kΩ 1 GND 4 ICs for Information Equipment AN8612NSB ■ Terminal Equivalent Circuits (continued) Pin No. 2 3 4 5 Symbol Pin 2: SG line14 Pin 3: SG line13 Pin 4: SG line12 Pin 5: SG line11 Equivalent circuit VCC 115 Ω REG out Pin 2 3 4 5 Standby GND 6 GND Fin GND 7 8 9 10 11 Pin 7: SG line10 Pin 8: SG line9 Pin 9: SG line8 Pin 10: SG line7 Pin 11: SG line6 VCC 115 Ω REG out Pin 7 8 9 10 11 Standby GND 12 13 Pin 12: VCC (TERMPWR) Pin 13: VCC (TERMPWR) 12 13 GND 14 15 16 17 18 Pin 14: SG line5 Pin 15: SG line4 Pin 16: SG line3 Pin 17: SG line2 Pin 18: SG line1 VCC 115 Ω REG out Standby GND Pin 14 15 16 17 18 5 AN8612NSB ICs for Information Equipment ■ Terminal Equivalent Circuits (continued) Pin No. Symbol Equivalent circuit Fin GND 19 GND 20 21 22 23 Pin 20: SG line18 Pin 21: SG line17 Pin 22: SG line16 Pin 23: SG line15 VCC 115 Ω REG out Pin 20 21 22 23 Standby GND 24 REG out VCC 24 20 kΩ Standby GND ■ Application Notes • PD Ta curves of HSOP030-P-0300 PD T a 1400 1344 Rth(j-C) = 29.5°C/W Power dissipation PD (W) 1200 Mounted on standard board (glass epoxy: 50 mm × 50 mm × t0.8 mm) Rth(j-a) = 93°C/W PD = 1 344 mW (25°C) 1000 800 686 600 Independent IC without a heat shink Rth(j-a) = 182°C/W PD = 686 mW (25°C) 400 200 0 0 25 50 75 100 Ambient temperature Ta (°C) 6 125 150 Terminator: Active GND REG out AN8612NSB Standby VCC SG line18 ··············· SG line1 TERMPWR SCSI equipment SCSI cable Terminator: Standby GND REG out AN8612NSB Standby VCC SG line18 ··············· SG line1 TERMPWR SCSI equipment SCSI cable Terminator: Active GND REG out AN8612NSB Standby VCC SG line18 ··············· SG line1 TERMPWR SCSI equipment ICs for Information Equipment AN8612NSB ■ Application Circuit Example 7