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ICs for Information Equipment
AN8612NSB
SCSI active terminator IC
s Overview
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.
12.630.20 (1.90) 24 19 18 13
Unit: mm
2.000.20
1
6
7
12
5.500.20 7.600.30
(1.05)
0.100.10
0.20 -0.05
+0.10
s Features
* Active termination for 18-signal line * Low power consumption due to its standby function (100 A at standby). * Small output pin capacitance: 3.8 pF (typ.) * High precision regulator: 2.85 V60 mV
(0.715)
(3.20) 0.80
+0.10 0.30-0.05
0 to 10 0.500.20
Seating plane
HSOP030-P-0300
s Applications
* SCSI interface board of PC * SCSI-compatible equipment such as CD-ROM, MO, PD, MD drive and printer
1
AN8612NSB
s Block Diagram
ICs for Information Equipment
24 12 TERMPWR 13 2.85 V 115 18 115 17 115 16 Thermal shut down 115 15 115 14 115 11 Band gap reference 115 10 115 115 115 115 115 115 115 9 8 7 5 4 3 2
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
115 23 115 22 115 21 115 20 Standby 1
19 GND
2
GND
6
ICs for Information Equipment
s Pin Descriptions
Pin No. 1 2 3 4 5 6 Fin 7 8 9 10 11 12 Standby
*1
AN8612NSB
Description
Pin No. 13 14 15 16 17 18 Fin 19 20 21 22 23
Description VCC (TERMPWR) *3 SG line5 SG line4 SG line3 SG line2 SG line1 GND *2 GND *2 SG line18 SG line17 SG line16 SG line15 REG out
SG line14 SG line13 SG line12 SG line11 GND GND
*2 *2
SG line10 SG line9 SG line8 SG line7 SG line6 VCC (TERMPWR)
*3
24
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).
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation
*2 *1
Symbol VCC ICC PD Topr Tstg
Rating 6.0 550 412 -20 to +75 -55 to +150
Unit V mA mW C C
Operating ambient temperature Storage temperature
*1
Note) *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for Ta = 25C. *2: Ta = 75C. For the independent IC without a heat sink. Refer to "s Application Notes".
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 4.0 to 5.5 Unit V
3
AN8612NSB
s Electrical Characteristics at VCC = 5.0 V, Ta = 25C
Parameter Supply current 1 Supply current 2 Supply current 3 Standby pin low-level input current Standby pin high-level input current Standby pin positive direction threshold voltage Standby pin negative direction threshold voltage Maximum output current SG line1 to SG line18 Output leak current 1 SG line1 to SG line18 Output leak current 2 SG line1 to SG line18 REG output voltage 1 REG output voltage 2 Termination resistance value SG line1 to SG line18 High-level output voltage SG line1 to SG line18 * Design reference data Symbol ICC1 ICC2 ICC3 ISTBYL ISTBYH VTH+ VTH- ISG ILK1 ILK2 VREG1 VREG2 RSG VSGH VSG = 0.2 V VCC = 5.5 V Standby = open, VSG = 0 V VCC = 5.5 V, VSG = 2.85 V Standby = open Conditions
ICs for Information Equipment
Min -150 1.3 1.1 19.8 -1 -1 2.79 2.00 107 2.78
Typ 44 458 100 -50 1.5 1.3 23.0 2.85 115 2.85
Max 54 530 200 1 1.7 1.5 26.2 1 2.91 123 2.92
Unit mA mA A A A V V mA A A V V V
Standby = low, all SG line = open Standby = low, All SG line = 0.2 V Standby = open VCC = 5.5 V, VI = 0 V VCC = 5.5 V, VI = 5.5 V
VCC = 4.0 V to 5.5 V, all SG line = open VCC = 3.2 V, all SG line = open ISG = 5 mA to 15 mA VCC = 4.0 V to 5.5 V, all SG line = open
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Parameter Standby pin hysteresis width Output pin capacitance Thermal shutdown temperature
Symbol VHYS CSG TTSD
Conditions
Min
Typ 200 3.8 170
Max 4.5
Unit mV pF C
s Terminal Equivalent Circuits
Pin No. 1 Standby
100 k
Symbol
Equivalent circuit
VCC
1
GND
4
ICs for Information Equipment
s 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
VCC
AN8612NSB
Equivalent circuit
115 REG out Standby GND Pin 2 3 4 5
6 Fin 7 8 9 10 11
GND GND Pin 7: SG line10 Pin 8: SG line9 Pin 9: SG line8 Pin 10: SG line7 Pin 11: SG line6
VCC

115 REG out Standby GND Pin 7 8 9 10 11
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 REG out Standby GND Pin 14 15 16 17 18
5
AN8612NSB
s Terminal Equivalent Circuits (continued)
Pin No. Fin 19 20 21 22 23 GND GND Pin 20: SG line18 Pin 21: SG line17 Pin 22: SG line16 Pin 23: SG line15
VCC
ICs for Information Equipment
Symbol
Equivalent circuit
115 REG out Standby GND Pin 20 21 22 23
24
REG out
VCC
24 20 k Standby
GND
s Application Notes
* PD Ta curves of HSOP030-P-0300 PD T a
1400 1344 1200 Mounted on standard board (glass epoxy: 50 mm x 50 mm x t0.8 mm) Rth(j-a) = 93C/W PD = 1 344 mW (25C) Rth(j-C) = 29.5C/W
Power dissipation PD (W)
1000
800 686 600 Independent IC without a heat shink Rth(j-a) = 182C/W PD = 686 mW (25C)
400
200
0
0
25
50
75
100
125
150
Ambient temperature Ta (C)
6
s Application Circuit Example
ICs for Information Equipment
SCSI equipment
SCSI equipment
SCSI equipment
TERMPWR SCSI cable SG line1 VCC REG out AN8612NSB SG line18 SCSI cable
***************
TERMPWR
***************
TERMPWR
*************** SG line1 VCC SG line18 REG out AN8612NSB Standby
SG line1
SG line18
VCC
REG out AN8612NSB Standby GND
Standby
GND
GND
Terminator: Active
Terminator: Standby
Terminator: Active
AN8612NSB
7
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(1) An export permit needs to be obtained from the competent authorities of the Japanese Government if any of the products or technologies described in this material and controlled under the "Foreign Exchange and Foreign Trade Law" is to be exported or taken out of Japan. (2) The technical information described in this material is limited to showing representative characteristics and applied circuit examples of the products. It does not constitute the warranting of industrial property, the granting of relative rights, or the granting of any license. (3) The products described in this material are intended to be used for standard applications or general electronic equipment (such as office equipment, communications equipment, measuring instruments and household appliances). Consult our sales staff in advance for information on the following applications: * Special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the products may directly jeopardize life or harm the human body. * Any applications other than the standard applications intended. (4) The products and product specifications described in this material are subject to change without notice for reasons of modification and/or improvement. At the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date Product Standards in advance to make sure that the latest specifications satisfy your requirements. (5) When designing your equipment, comply with the guaranteed values, in particular those of maximum rating, the range of operating power supply voltage and heat radiation characteristics. Otherwise, we will not be liable for any defect which may arise later in your equipment. Even when the products are used within the guaranteed values, redundant design is recommended, so that such equipment may not violate relevant laws or regulations because of the function of our products. (6) When using products for which dry packing is required, observe the conditions (including shelf life and after-unpacking standby time) agreed upon when specification sheets are individually exchanged. (7) No part of this material may be reprinted or reproduced by any means without written permission from our company.
Please read the following notes before using the datasheets
A. These materials are intended as a reference to assist customers with the selection of Panasonic semiconductor products best suited to their applications. Due to modification or other reasons, any information contained in this material, such as available product types, technical data, and so on, is subject to change without notice. Customers are advised to contact our semiconductor sales office and obtain the latest information before starting precise technical research and/or purchasing activities. B. Panasonic is endeavoring to continually improve the quality and reliability of these materials but there is always the possibility that further rectifications will be required in the future. Therefore, Panasonic will not assume any liability for any damages arising from any errors etc. that may appear in this material. C. These materials are solely intended for a customer's individual use. Therefore, without the prior written approval of Panasonic, any other use such as reproducing, selling, or distributing this material to a third party, via the Internet or in any other way, is prohibited.
2001 MAR

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