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ICs for Information Equipment
AN8612NSB
SCSI active terminator IC
I 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
I 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 Note) The package of this product will be changed to lead-free type (HSOP030-P-0300A). See the new package dimensions section later of this datasheet.
I Applications
* SCSI interface board of PC * SCSI-compatible equipment such as CD-ROM, MO, PD, MD drive and printer
Publication date: November 2001
SDF00007BEB
1
AN8612NSB
I Block Diagram
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
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GND
6
AN8612NSB
I Pin Descriptions
Pin No. 1 2 3 4 5 6 Fin 7 8 9 10 11 12 Standby
*1
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).
I 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 "I Application Notes".
I Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 4.0 to 5.5 Unit V
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3
AN8612NSB
I 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
Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed.
Symbol ICC1 ICC2 ICC3 ISTBYL ISTBYH VTH+ VTH- ISG ILK1 ILK2 VREG1 VREG2 RSG VSGH VSG = 0.2 V
Conditions 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
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
VCC = 5.5 V Standby = open, VSG = 0 V VCC = 5.5 V, VSG = 2.85 V Standby = open 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
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
I Terminal Equivalent Circuits
Pin No. 1 Standby
100 k
Symbol
Equivalent circuit
VCC
1
GND
4
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AN8612NSB
I 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
Equivalent circuit
REG out Standby GND
115 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

REG out Standby GND
115 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
REG out Standby GND
115 Pin 14 15 16 17 18
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5
AN8612NSB
I 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
Symbol
Equivalent circuit
REG out Standby GND
115 Pin 20 21 22 23
24
REG out
VCC
24 20 k Standby
GND
I 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
SDF00007BEB
I Application Circuit Example
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
SDF00007BEB
SG line1
SG line18
VCC
REG out AN8612NSB Standby GND
Standby
GND
GND
Terminator: Active
Terminator: Standby
Terminator: Active
AN8612NSB
7
AN8612NSB
I New Package Dimensions (Unit: mm)
* HSOP030-P-0300A (Lead-free package) 12.630.20 (1.90) 24 19 18 13
0.20-0.05
+0.10
(1.05)
5.500.20
7.600.30
0 to 10 0.500.20 1 (0.715) 6 0.80 7 (3.20) 0.30+0.10 -0.05 12
2.000.20 0.100.10
Seating plane
Seating plane
8
SDF00007BEB
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Please read the following notes before using the datasheets
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2001 MAR

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